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Tips for getting started:
1. Ask questions, edit files, or run commands.
2. Be specific for the best results.
3. /help for more information.
╭──────────────────────────────────────────────────────────────────────────╮
│ > A WIP patch to spanify the following files has been applied: │
│ - media/base/vector_math.cc │
│ - media/base/vector_math_testing.h │
│ - media/base/vector_math_unittest.cc │
│ │
│ --- │
│ │
│ Your job is to finish/polish the patch following the instructions │
│ below. │
│ Your job is done when the patch is ready. Do not start trying to │
│ spanify files beyond the scope of this patch. │
│ You should first examine the patch with `git show HEAD`. │
│ When the job is done, say "GEMINI_JOB_COMPLETE_GEMINI". │
│ │
│ ### **LLM Prompt: Fixing Unsafe Buffer Usage in Chromium** │
│ │
│ **Role:** You are an expert C++ developer specializing in memory │
│ safety for the Chromium project. Your primary goal is to eliminate │
│ unsafe buffer operations by migrating legacy C-style code to modern, │
│ safer C++ constructs, with a strong emphasis on `base::span` and │
│ other standard library containers. You must adhere to Chromium's │
│ coding standards and the specific guidelines for this task. │
│ │
│ **Task:** Your task is to fix unsafe buffer usage in a given C++ │
│ file. You should compile the target with provided command line after │
│ removing the `#pragma allow_unsafe_buffers` and `UNSAFE_TODO` │
│ directive. You will use these errors to identify and fix the unsafe │
│ code, applying the principles and patterns outlined below. **Your │
│ changes must be minimal and targeted, directly addressing only the │
│ unsafe buffer errors.** While the primary focus is on the given │
│ file, you are expected to modify other files (e.g., header files or │
│ call sites) if necessary to ensure the code compiles and tests pass. │
│ │
│ ### **Guiding Philosophy** │
│ * **Safety Through the Type System:** The fundamental goal is to │
│ encode buffer size information into the C++ type system. A `char*` │
│ has no size information, making it unsafe. A `base::span<char>` has │
│ a size, making it safe. Every change you make should serve this │
│ principle. │
│ * **Minimalism is Essential:** Your task is not to refactor or │
│ improve the code in general. You are a specialist surgeon fixing one │
│ specific problem: unsafe buffer usage. Make the smallest possible │
│ change that fixes the compiler warning and passes tests. │
│ * **Trust, But Verify with Compilation:** Your primary feedback │
│ loop is the compiler. After removing the `allow_unsafe_buffers` │
│ pragma, the `-Wunsafe-buffer-usage` errors are your map. Use them to │
│ identify every location that needs a fix. │
│ │
│ │
│ You must refer to these documents to ensure your solutions are │
│ idiomatic and correct within the Chromium ecosystem. │
│ │
│ # Workflow Tips │
│ │
│ ## General Workflow: │
│ │
│ * **User Guidance:** Proactively communicate your plan and the │
│ reason for each │
│ step. │
│ * **File Creation Pre-check:** Before creating any new file, you │
│ MUST first │
│ perform a thorough search for existing files that can be │
│ modified or │
│ extended. This is especially critical for tests; never create a │
│ new test │
│ file if one already exists for the component in question. Always │
│ add new │
│ tests to the existing test file. │
│ * **Read Before Write/Edit:** **ALWAYS** read the entire file │
│ content │
│ immediately before writing or editing. │
│ │
│ ## MANDATORY DEBUGGING PROTOCOL (WHEN STUCK) │
│ │
│ * **Trigger:** You **MUST** activate this protocol if you │
│ encounter a │
│ **Repeated Tool or Command Failure**. │
│ │
│ * **Definition of Repeated Failure:** A tool or command (e.g., │
│ `autoninja`, `autotest.py`, `git cl format`, `replace`) │
│ fails. You apply │
│ a fix or change your approach. You run the *exact same tool │
│ or command* │
│ again, and it fails for a **second time**. │
│ * **Sensitivity:** This protocol is intentionally highly │
│ sensitive. The │
│ error message for the second failure does **NOT** need to be │
│ the same as │
│ the first. Any subsequent failure of the same tool or │
│ command after a │
│ fix attempt is a trigger. This is to prevent "whack-a-mole" │
│ scenarios │
│ where fixing one error simply reveals another, indicating a │
│ deeper │
│ underlying problem. │
│ │
│ *Check your history to confirm the repeated failure of the tool │
│ or command.* │
│ │
│ * **Action:** If the trigger condition is met: │
│ │
│ 1. **STOP:** **DO NOT** immediately retry the *same* fix or │
│ re-run the │
│ *same* tool or command again. │
│ 2. **INFORM USER:** Immediately inform the user that you are │
│ invoking the │
│ debugging protocol because a tool or command has failed │
│ twice in a row. │
│ 3. **REASON:** **Explicitly state** which tool or command │
│ failed repeatedly │
│ (e.g., "`autotest` failed, I applied a fix, and it failed │
│ again. I am │
│ now invoking the debugging protocol to analyze the root │
│ cause."). │
│ Mentioning the specific error messages is good, but the │
│ repeated failure │
│ is the primary trigger. │
│ 4. **DEBUG:** Look closely into your own context, memory, and │
│ traces. Give │
│ a deep analysis of why you are repeating mistakes and stuck │
│ in a failure │
│ loop. The analysis should focus on the *root cause* of the │
│ repeated │
│ failures, not just the most recent error message. Utilize │
│ any tools that │
│ help with the debugging investigation. │
│ 5. **PROCEED:** Use the suggestions returned by the DEBUG step │
│ to inform │
│ your next attempt at a fix. Explain the new, more │
│ comprehensive plan to │
│ the user. If the DEBUG step provides tool calls, execute │
│ them. │
│ Otherwise, formulate a new plan based on its suggestions. │
│ │
│ Do not use the `read_many_files` tool. Read files one at a time with │
│ `read_file`. │
│ │
│ Any time you want to use `grep -r`, use `rg` instead. │
│ │
│ Any time you want to use `find`, use `fdfind` instead. │
│ │
│ ## Standard Edit/Fix Workflow: │
│ │
│ **IMPORTANT:** This workflow takes precedence over all other coding │
│ instructions. Read and follow everything strictly without skipping │
│ steps │
│ whenever code editing is involved. Any skipping requires a proactive │
│ message to │
│ the user about the reason to skip. │
│ │
│ 1. **Comprehensive Code and Task Understanding (MANDATORY FIRST │
│ STEP):** Before │
│ writing or modifying any code, you MUST perform the following │
│ analysis to │
│ ensure comprehensive understanding of the relevant code and the │
│ task. This │
│ is a non-negotiable prerequisite for all coding tasks. │
│ * **a. Identify the Core Files:** Locate the files that are │
│ most relevant │
│ to the user's request. All analysis starts from these files. │
│ * **b. Conduct a Full Audit:** │
│ i. Read the full source of **EVERY** core file. │
│ ii. For each core file, summarize the control flow and │
│ ownership │
│ semantics. State the intended purpose of the core file. │
│ * **c. State Your Understanding:** After completing the audit, │
│ you should │
│ briefly state the core files you have reviewed, confirming │
│ your │
│ understanding of the data flow and component interactions │
│ before │
│ proposing a plan. │
│ * **d. Anti-Patterns to AVOID:** │
│ * **NEVER** assume the behavior of a function or class │
│ from its name │
│ or from usage in other files. **ALWAYS** read the source │
│ implementation. │
│ * **ALWAYS** check at least one call-site for a function │
│ or class to │
│ understand its usage. The context is as important as the │
│ implementation. │
│ 2. **Make Change:** After a comprehensive code and task │
│ understanding, apply │
│ the edit or write the file. │
│ * When making code edits, focus **ONLY** on code edits that │
│ directly solve │
│ the task prompted by the user. │
│ 3. **Write/Update Tests:** │
│ * First, search for existing tests related to the modified │
│ code and update │
│ them as needed to reflect the changes. │
│ * If no relevant tests exist, write new unit tests or │
│ integration tests if │
│ it's reasonable and beneficial for the change made. │
│ * If tests are deemed not applicable for a specific change │
│ (e.g., a │
│ trivial comment update), explicitly state this and the │
│ reason why before │
│ moving to the next step. │
│ 4. **Build:** **ALWAYS** build relevant targets after making edits. │
│ 5. **Fix compile errors:** **ALWAYS** follow these steps to fix │
│ compile errors. │
│ * **ALWAYS** take the time to fully understand the problem │
│ before making │
│ any fixes. │
│ * **ALWAYS** read at least one new file for each compile │
│ error. │
│ * **ALWAYS** find, read, and understand **ALL** files related │
│ to each │
│ compile error. For example, if an error is related to a │
│ missing member │
│ of a class, find the file that defines the interface for the │
│ class, read │
│ the whole file, and then create a high-level summary of the │
│ file that │
│ outlines all core concepts. Come up with a plan to fix the │
│ error. │
│ * **ALWAYS** check the conversation history to see if this │
│ same │
│ error occurred earlier, and analyze previous solutions to │
│ see why they │
│ didn't work. │
│ * **NEVER** make speculative fixes. You should be confident │
│ before │
│ applying any fix that it will work. If you are not │
│ confident, read more │
│ files. │
│ 6. **Test:** **ALWAYS** run relevant tests after a successful │
│ build. If you │
│ cannot find any relevant test files, you may prompt the user to │
│ ask how this │
│ change should be tested. │
│ 7. **Fix test errors**: │
│ * **ALWAYS** take the time to fully understand the problem │
│ before making │
│ any fixes. │
│ 8. **Iterate:** Repeat building and testing using the above steps │
│ until all are │
│ successful. │
│ │
│ --- │
│ │
│ ### **Core Principles for Safe Buffer Handling** │
│ │
│ Before looking at specific patterns, adhere to these fundamental │
│ principles. │
│ │
│ * **Principle 0: Clearly Distinguish Ownership** │
│ Before you change any code, your first step is to determine if │
│ the variable in question represents owning or non-owning memory. │
│ This single decision dictates the correct C++ type to use. │
│ │
│ * **Owning Buffers:** Use an owning container when the code is │
│ responsible for the memory's lifetime (allocating and freeing it). │
│ * `std::vector<T>`: This is the default and preferred │
│ choice for a dynamically-sized, owning buffer. │
│ * `std::string`: The standard choice for owning a buffer │
│ of characters. │
│ * `std::array<T, N>`: Use this for a fixed-size buffer │
│ whose lifetime is tied to its scope (typically on the stack). It's a │
│ direct, safer replacement for C-style arrays like `int │
│ my_array[10];`. │
│ * `base::HeapArray<T>`: A Chromium-specific alternative │
│ for heap-allocated arrays, sometimes useful for interfacing with │
│ legacy code. │
│ │
│ * **Non-Owning Buffers (Views/Spans):** Use a non-owning view │
│ when the code needs to safely refer to and operate on memory that is │
│ owned by another object (like a `std::vector` or `std::array`). │
│ * `base::span<T>`: This is the default and preferred │
│ choice for a non-owning, mutable, or immutable view of a contiguous │
│ sequence of objects. It's the primary tool for replacing `(T* ptr, │
│ size_t size)` parameters. │
│ * `std::string_view`: Use this for a non-owning, read-only │
│ view of a sequence of characters. It provides a rich set of │
│ string-manipulation methods (`.starts_with()`, `.find()`, etc.) that │
│ `base::span<const char>` lacks. │
│ │
│ * **Principle 1: Avoid Unsafe APIs, Even If They Look Modern.** │
│ The goal is to eliminate the *root cause* of unsafety, not just │
│ silence the compiler. Certain modern-looking APIs are still unsafe. │
│ │
│ * **DO NOT USE:** The `base::span(pointer, size)` constructor. │
│ It is marked `UNSAFE_BUFFER_USAGE` for a reason—it does not verify │
│ that `size` is a valid length for `pointer`. Using it is no safer │
│ than the original code. │
│ * **DO NOT USE:** `std::next()` or `std::advance()` to silence │
│ buffer warnings. These functions perform unchecked pointer │
│ arithmetic and are just as unsafe as `ptr + offset`. │
│ ```cpp │
│ // Old and Unsafe (silences warning, but still dangerous): │
│ auto it = std::find(std::next(vec.begin(), offset), │
│ vec.end(), 20); │
│ // New and Safe: │
│ auto it = std::ranges::find(base::span(vec).subspan(offset), │
│ 20); │
│ ``` │
│ * **DO NOT USE:** `base::StringView`. This is a legacy, │
│ deprecated type. The correct and modern type for a non-owning string │
│ view is `std::string_view`. Be mindful to use the `std` namespace │
│ for string views. │
│ * **DO NOT USE: `UNSAFE_BUFFERS` without a safety │
│ justification.** Individual expressions can be opted out with │
│ `UNSAFE_BUFFERS()`, but these are for rare cases like interfacing │
│ with C-style external APIs. They **must always** be accompanied by a │
│ `// SAFETY:` comment explaining in detail why the code has been │
│ evaluated to be safe for all possible inputs. Code without this │
│ justification should be rejected. │
│ │
│ * **Principle 3: Prefer Safe, Size-Aware Constructors and │
│ Factories.** Always create spans from sources that already know │
│ their own size. This is the key to memory safety. │
│ │
│ * **DO USE:** `base::span(container)` where `container` is an │
│ `std::vector`, `std::array`, `std::string`, `base::HeapArray`, etc. │
│ * **DO USE:** `base::span(other_span).subspan(...)` to create │
│ safe views into existing spans. │
│ * **DO USE:** `base::as_byte_span(container)` and │
│ `base::as_writable_byte_span(container)` for safe type-punning to a │
│ byte view. │
│ * **DO USE:** `base::span_from_ref(object)` to create a span │
│ of size 1 pointing to a single object. │
│ * **DO USE:** `base::byte_span_from_ref(object)` for a byte │
│ view of a single object. │
│ │
│ --- │
│ │
│ ### **Toolbox of Fixes and Patterns** │
│ │
│ Here is a comprehensive set of patterns for fixing common unsafe │
│ buffer issues. │
│ │
│ #### **1. Fundamental Replacements: Pointers and C-Arrays** │
│ │
│ The most common task is replacing raw pointers and C-style arrays │
│ with safer, bounds-checked alternatives. │
│ │
│ * **Pattern:** Replace function parameters `(T* ptr, size_t size)` │
│ with a single `base::span<T>`. │
│ │
│ * **Example:** │
│ ```cpp │
│ // Old │
│ void ProcessData(const uint8_t* data, size_t size); │
│ │
│ // New │
│ void ProcessData(base::span<const uint8_t> data); │
│ ``` │
│ │
│ * **Pattern:** Replace C-style stack arrays `T arr[N]` with │
│ `std::array<T, N>`. For string literals, `std::to_array` is a │
│ convenient helper. │
│ │
│ * **Example:** │
│ ```cpp │
│ // Old │
│ const char kAllowed[] = "abc"; │
│ int values[10]; │
│ │
│ // New │
│ // For C-style string literals, std::to_array is simplest. │
│ constexpr auto kAllowed = std::to_array("abc"); │
│ std::array<int, 10> values; │
│ ``` │
│ │
│ * **Pattern:** Replace raw heap-allocated arrays (`new T[size]`, │
│ `std::make_unique<T[]>(size)`) with `std::vector<T>` or │
│ `base::HeapArray<T>`. │
│ │
│ * **Reasoning:** `std::vector` and `base::HeapArray` are │
│ self-managing, provide size information, and prevent common memory │
│ management errors. They also integrate perfectly with `base::span`. │
│ * **Example:** │
│ ```cpp │
│ // Old │
│ auto buffer = std::make_unique<char[]>(1024); │
│ ReadData(fd, buffer.get(), 1024); │
│ │
│ // New │
│ std::vector<char> buffer(1024); │
│ ReadData(fd, base::as_writable_byte_span(buffer)); │
│ ``` │
│ │
│ * **Pattern:** When passing an array to a function, use │
│ `base::span` to create a non-owning view. │
│ │
│ * **Example:** │
│ ```cpp │
│ std::array<int, 10> my_array; │
│ // Old: ProcessData(my_array.data(), my_array.size()); │
│ // New │
│ ProcessData(base::span(my_array)); │
│ ``` │
│ * **Pattern:** For class member fields that are non-owning views, │
│ you must use `base::raw_span<T>` over `base::span<T>`. │
│ * **Reasoning:** This is a critical memory safety requirement. │
│ `base::raw_span` is implemented with MiraclePtr, which protects │
│ against Use-After-Free (UAF) bugs. If the underlying object is │
│ freed, any attempt to use the `raw_span` will result in a controlled │
│ crash instead of allowing dangerous memory corruption or type │
│ confusion attacks. A regular `base::span` offers no UAF protection. │
│ ```cpp │
│ class MyClass { │
│ private: │
│ // Old: base::span<int> data_; │
│ // New: │
│ base::raw_span<int> data_; │
│ }; │
│ ``` │
│ │
│ #### **2. Replacing Unsafe C-Style Library Functions** │
│ │
│ * **Pattern:** Replace `memcpy` and `memmove` with │
│ `base::span::copy_from()`. │
│ * **Reasoning:** Do not use `std::ranges::copy`. It is unsafe │
│ because it does not verify that the source and destination spans │
│ have the same size, which can lead to buffer overflows. │
│ `base::span::copy_from()` is the only safe alternative, as it │
│ includes a `CHECK` to ensure the sizes match exactly. │
│ * **Example:** │
│ ```cpp │
│ // Old │
│ memcpy(dest_ptr, src_ptr, N); │
│ │
│ // New (Safe and Idiomatic) │
│ // This CHECKs that both subspans are of size N. │
│ dest_span.first(N).copy_from(src_span.first(N)); │
│ ``` │
│ │
│ * **Pattern:** Replace `memset` with `std::ranges::fill()`. │
│ │
│ * **Example:** │
│ ```cpp │
│ // Old │
│ memset(buffer, 0, sizeof(buffer)); │
│ │
│ // New │
│ std::ranges::fill(my_span, 0); │
│ ``` │
│ │
│ * **Pattern:** Replace `memcmp` with `base::span::operator==` or │
│ `std::ranges::equal`. │
│ │
│ * **Example:** │
│ ```cpp │
│ // Old │
│ bool are_equal = memcmp(ptr1, ptr2, size) == 0; │
│ │
│ // New │
│ bool are_equal = span1 == span2; │
│ ``` │
│ │
│ #### **3. Eliminating Pointer Arithmetic and Unsafe Casting** │
│ │
│ * **Pattern:** Replace pointer arithmetic like `ptr + offset` with │
│ `span.subspan(offset)`. │
│ │
│ * **Example:** │
│ ```cpp │
│ // Old │
│ ProcessData(data + 10, size - 10); │
│ │
│ // New │
│ ProcessData(data_span.subspan(10)); │
│ ``` │
│ │
│ * **Pattern:** Avoid `reinterpret_cast` for changing element │
│ types. Use safe casting functions like `base::as_bytes()`, │
│ `base::as_writable_byte_span()`, or `base::as_chars()`. │
│ │
│ * **Example:** │
│ ```cpp │
│ // Old │
│ const uint8_t* bytes = reinterpret_cast<const │
│ uint8_t*>(str.data()); │
│ │
│ // New │
│ base::span<const uint8_t> bytes = base::as_byte_span(str); │
│ ``` │
│ * **Caution:** When using `base::as_byte_span()` on a │
│ `struct`, be aware of padding bytes. If the struct's padding is not │
│ explicitly initialized (e.g., via `memset` or aggregate │
│ initialization), reading from the resulting byte span can lead to │
│ reads of uninitialized memory. This is safest with spans of │
│ primitive types. │
│ │
│ * **Pattern:** To read or write structured data (like a │
│ `uint32_t`) from/to a byte buffer, use the endian-converting helpers │
│ from `base/numerics/byte_conversions.h`. │
│ │
│ * **Example (Writing):** │
│ ```cpp │
│ // Old (UNSAFE AND UNDEFINED BEHAVIOR) │
│ *reinterpret_cast<uint32_t*>(byte_span.data()) = my_value; │
│ │
│ // New (Safe and Idiomatic) │
│ #include "base/numerics/byte_conversions.h" │
│ auto value_bytes = base::U32ToLittleEndian(my_value); │
│ byte_span.first(value_bytes.size()).copy_from(value_bytes); │
│ ``` │
│ │
│ * **Example (Reading):** │
│ ```cpp │
│ // Old (UNSAFE) │
│ uint32_t value = *reinterpret_cast<const │
│ uint32_t*>(byte_span.data()); │
│ │
│ // New (Safe and Idiomatic) │
│ #include "base/numerics/byte_conversions.h" │
│ uint32_t value = │
│ base::U32FromLittleEndian(byte_span.first<4>()); │
│ ``` │
│ * **Pattern:** For dynamic or heterogeneous I/O, use │
│ `base::SpanReader` and `base::SpanWriter` to safely consume or │
│ populate a buffer. This is safer and more expressive than manual │
│ pointer casting and offsetting. │
│ * **Example (Writing with `SpanWriter`):** │
│ ```cpp │
│ #include "base/containers/span_writer.h" │
│ #include "base/numerics/byte_conversions.h" │
│ void WriteData(base::span<uint8_t> out, uint32_t id, float │
│ value) { │
│ auto writer = base::SpanWriter(out); │
│ writer.WriteU32BigEndian(id); │
│ writer.Write(base::FloatToLittleEndian(value)); │
│ } │
│ ``` │
│ * **Pattern:** Refactor sequential buffer filling with a │
│ "consuming span". This is for cases where a buffer is allocated │
│ once, and then a pointer is manually advanced as data is written to │
│ it sequentially. │
│ * **Reasoning:** Instead of managing a write-pointer and an │
│ end-pointer manually, a single `base::span` can represent the │
│ remaining, writable portion of the buffer. This is safer and more │
│ expressive. │
│ * **Example:** │
│ ```cpp │
│ // Helper function that writes a string and "consumes" part │
│ of the span. │
│ void WriteStringAndAdvance(base::span<char>& buffer, const │
│ char* str) { │
│ if (!str) { │
│ return; │
│ } │
│ const size_t len_with_null = strlen(str) + 1; │
│ DCHECK_GE(buffer.size(), len_with_null); │
│ memcpy(buffer.data(), str, len_with_null); │
│ // The span is sliced, now pointing to the remaining │
│ writable area. │
│ buffer = buffer.subspan(len_with_null); │
│ } │
│ │
│ // Old function that manually manages pointers. │
│ void CreateMessageUnsafe(char* buffer, size_t size, const │
│ char* str1, const char* str2) { │
│ char* ptr = buffer; │
│ const char* end = buffer + size; │
│ │
│ // Manual copy and advance │
│ size_t len1 = strlen(str1) + 1; │
│ CHECK_LE(ptr + len1, end); │
│ memcpy(ptr, str1, len1); │
│ ptr += len1; │
│ │
│ // Another manual copy and advance │
│ size_t len2 = strlen(str2) + 1; │
│ CHECK_LE(ptr + len2, end); │
│ memcpy(ptr, str2, len2); │
│ ptr += len2; │
│ } │
│ │
│ // New function using the "consuming span" pattern. │
│ void CreateMessageSafe(base::span<char> buffer, const char* │
│ str1, const char* str2) { │
│ WriteStringAndAdvance(buffer, str1); │
│ WriteStringAndAdvance(buffer, str2); │
│ // At this point, `buffer` correctly represents the │
│ unused portion. │
│ } │
│ ``` │
│ * **Key Idea:** The core of this pattern is to create a helper │
│ function (like `WriteStringAndAdvance`) that takes the main buffer │
│ span by reference (`&`). The helper writes its data and then │
│ reassigns the span to a smaller subspan, effectively advancing the │
│ "write position" for the next operation in the calling function. │
│ │
│ #### **4. String and Character Manipulation** │
│ │
│ * **Pattern:** Replace C-style string literals (`const char │
│ kFoo[]`) with `constexpr std::string_view kFoo` or `constexpr │
│ std::array`. │
│ * **Pattern:** For C APIs that require a NUL-terminated string, │
│ use `base::cstring_view`. │
│ * **Pattern:** Replace C-style string functions (`strcmp`, │
│ `strstr`, etc.) with `std::string_view` methods (`operator==`, │
│ `.find()`, etc.). │
│ * **Pattern:** Replace pointer-based iteration over a buffer with │
│ a range-based for loop over a `base::span`. │
│ * **Pattern:** Choose the correct string view type based on │
│ null-termination requirements. │
│ * **Reasoning:** You must differentiate between internal C++ │
│ logic and calls to C-style APIs. A `std::string_view` is not │
│ guaranteed to be null-terminated, while `base::cstring_view` │
│ provides this guarantee. Using the wrong type can lead to buffer │
│ over-reads. │
│ * **Decision Flow:** │
│ * If the string is only used with modern C++ methods (like │
│ `.find()` or range `for` loops) that use an explicit size, use │
│ `std::string_view`. │
│ * If the string needs to be passed to an API that requires │
│ a null-terminated `const char*` (like `printf`, `sscanf`, or legacy │
│ functions), you must use `base::cstring_view`. │
│ * **Example:** │
│ ```cpp │
│ // A legacy C-style function │
│ void LogToOldSystem(const char* message); │
│ │
│ // --- │
│ // In some calling code --- │
│ std::string my_string = "Hello, World!"; │
│ std::string_view full_view = my_string; │
│ │
│ // UNSAFE: This substring is not null-terminated in │
│ my_string. │
│ std::string_view unsafe_view = full_view.substr(7, 5); // │
│ "World" │
│ // LogToOldSystem(unsafe_view.data()); // BUG! Reads past │
│ "d" into garbage. │
│ │
│ // SAFE: Create a new std::string which is guaranteed to be │
│ null-terminated. │
│ std::string safe_string(unsafe_view); │
│ LogToOldSystem(safe_string.c_str()); │
│ │
│ // IDEAL: Use a type that enforces the contract. │
│ // If the source is already a C-string, cstring_view is │
│ zero-copy. │
│ base::cstring_view safe_c_view = "Hello, World!"; │
│ LogToOldSystem(safe_c_view.c_str()); │
│ ``` │
│ │
│ │
│ #### **5. Advanced Patterns** │
│ * **Pattern:** To get a heap-allocated buffer with a specific │
│ memory alignment, use `base::AlignedUninit<T>` from │
│ `base/memory/aligned_memory.h`. │
│ ```cpp │
│ #include "base/memory/aligned_memory.h" │
│ // Get an uninitialized array of 16 floats, aligned to 32 bytes. │
│ base::AlignedHeapArray<float> array = │
│ base::AlignedUninit<float>(16, 32); │
│ ``` │
│ │
│ #### **6. Common Chromium-Specific Patterns** │
│ │
│ * **`net::IOBuffer`:** This class and its subclasses │
│ (`IOBufferWithSize`, `VectorIOBuffer`) now have span-like methods. │
│ Use them. │
│ │
│ * **Example:** │
│ ```cpp │
│ // Old │
│ auto data_view = base::span( │
│ reinterpret_cast<const uint8_t*>(io_buffer->data()), │
│ data_len); │
│ │
│ // New │
│ auto data_view = io_buffer->first(data_len); │
│ ``` │
│ │
│ * **`net::VectorIOBuffer`:** To create a buffer with known │
│ content, prefer constructing a `net::VectorIOBuffer` directly from a │
│ `std::vector` or `base::span` instead of allocating a raw buffer │
│ and using `memcpy`. │
│ │
│ * **Example:** │
│ ```cpp │
│ // Old │
│ auto buffer = │
│ base::MakeRefCounted<net::IOBufferWithSize>(data.size()); │
│ memcpy(buffer->data(), data.data(), data.size()); │
│ │
│ // New │
│ auto buffer = │
│ base::MakeRefCounted<net::VectorIOBuffer>(data); │
│ ``` │
│ │
│ #### **7. Interfacing with C-style/Third-Party APIs** │
│ │
│ * **Pattern:** When a C API returns pointers to different memory │
│ planes (e.g., video frames), create `base::span`s from those │
│ pointers and their known sizes at the API boundary. Use │
│ `UNSAFE_BUFFERS()` for this initial creation, then pass the safe │
│ spans throughout the rest of your C++ code. │
│ * **Example:** │
│ ```cpp │
│ // Old │
│ uint8_t* y_ptr = vpx_image->planes[0]; │
│ uint8_t* u_ptr = vpx_image->planes[1]; │
│ VideoFrame::WrapExternalYuvData(..., y_ptr, u_ptr, ...); │
│ │
│ // New │
│ // SAFETY: libvpx guarantees these pointers and sizes are │
│ valid. │
│ auto y_plane = │
│ UNSAFE_BUFFERS(base::span(vpx_image->planes[0], y_size)); │
│ auto u_plane = │
│ UNSAFE_BUFFERS(base::span(vpx_image->planes[1], u_size)); │
│ VideoFrame::WrapExternalYuvData(..., y_plane, u_plane, ...); │
│ ``` │
│ │
│ #### **8. The Containment Strategy: When a Full Fix is Too Complex** │
│ │
│ Sometimes, a complete refactor is not immediately feasible. In these │
│ cases, contain the unsafe operations. │
│ │
│ * **Strategy:** Instead of a file-level `#pragma`, wrap the │
│ *minimal* number of unsafe operations in the `UNSAFE_TODO()` macro. │
│ This macro acts like `UNSAFE_BUFFERS()` but signals that the code is │
│ a candidate for a future fix. │
│ * **Function-level Annotation:** If a function contains │
│ `UNSAFE_TODO()`, you must also mark the function's signature with │
│ the `UNSAFE_BUFFER_USAGE` attribute. This propagates the unsafety │
│ requirement to its callers, ensuring they are also marked or within │
│ an unsafe block. │
│ * **Example:** │
│ ```cpp │
│ // Old: │
│ // #pragma allow_unsafe_buffers │
│ // void DoSomething(const char* p) { │
│ // p++; │
│ // } │
│ │
│ // New (Contained): │
│ UNSAFE_BUFFER_USAGE void DoSomething(const char* p) { │
│ UNSAFE_TODO(p++); │
│ } │
│ ``` │
│ │
│ #### **9. Handling Redundant Parameters** │
│ │
│ * **Identify redundant parameters:** In functions that now take a │
│ base::span, find any size parameters that are now unneeded. A │
│ parameter is still considered redundant even if it's already used in │
│ a CHECK or DCHECK. │
│ │
│ * **Rename the parameter:** For any redundant parameter, rename it │
│ and all its references within the function by adding the prefix │
│ spanification_suspected_redundant_. │
│ │
│ * **Add a TODO and a CHECK:** At the top of the function body, add │
│ the following two lines: │
│ │
│ * A TODO comment: │
│ ```cpp │
│ // TODO(crbug.com/431824301): Remove unneeded parameter once │
│ validated to be redundant in M143. │
│ ``` │
│ * A CHECK to verify the redundant parameter matches the span's │
│ size: │
│ ```cpp │
│ CHECK(spanification_suspected_redundant_size_variable == │
│ span.size(), base::NotFatalUntil::M143); │
│ ``` │
│ │
│ * **Customize the CHECK:** In the CHECK you just added, you must: │
│ │
│ * Replace spanification_suspected_redundant_size_variable with │
│ the new name of the parameter you renamed in step 2. │
│ │
│ * Replace span.size() with a call to the actual base::span │
│ parameter's .size() method. │
│ │
│ * **Important constraints:** │
│ │
│ * Do not remove the parameter or update any call sites. │
│ │
│ * Do not change the function's logic to use span.size(); │
│ continue to use the newly-renamed parameter variable. │
│ │
│ * Do ensure the size parameter and the base::span's size are │
│ in the same unit before making changes. │
│ │
│ * Do not remove the parameter or the CHECK even if you │
│ confirmed that the unit tests pass. │
│ │
│ #### **10. Updating Function Definitions and Call Sites** │
│ │
│ * **Updating the Function Definition** │
│ * **Identify the target function:** Look for functions that │
│ have a parameter with the name pattern │
│ spanification_suspected_redundant_.... │
│ * **Remove the parameter:** In the function's definition and │
│ any corresponding declarations (e.g., in a header file), completely │
│ remove the redundant size parameter from the parameter list. │
│ * **Replace internal usages:** Inside the function's body, │
│ replace every use of the removed parameter with a call to the │
│ base::span's .size() method (e.g., my_span.size()). │
│ │
│ * **Updating the Call Sites** │
│ * **Find all call sites:** Use a command like git grep with │
│ the function name to find every location where the function is │
│ called throughout the codebase. │
│ * **Remove the argument at each call site:** For each call │
│ site you find, you must remove the argument that corresponds to the │
│ size parameter you deleted from the function's definition. │
│ * **Important:** Be very careful to only remove the specific, │
│ redundant argument. Do not change or remove any other arguments in │
│ the function call. │
│ │
│ * **Key Constraints** │
│ * You should only remove the parameter previously marked as │
│ redundant and its corresponding arguments at call sites. │
│ * Do not remove or rename any other parameters. │
│ * Do not rewrite the function's logic beyond replacing the │
│ deleted variable with span.size(). │
│ * Ensure that when you update a call site, you only remove the │
│ single, correct argument. │
│ │
│ #### **11. Handling Autogenerated Files** │
│ │
│ * **Pattern:** Another common pattern is for a change to require │
│ modification to an autogenerated file. Treat autogenerated files as │
│ unmodifiable for now. │
│ --- │
│ #### **12. Wrapping Unsafe APIs with Macros** │
│ │
│ In some cases, you will encounter functions from third-party │
│ libraries or other unmodifiable parts of the codebase that return a │
│ raw pointer to a buffer. Directly wrapping these with │
│ `UNSAFE_BUFFERS(base::span(pointer, size))` is one option, but a │
│ more robust and reusable solution is to create a dedicated wrapper │
│ macro in `base/containers/auto_spanification_helper.h`. │
│ │
│ * **Strategy:** When an unmodifiable function call returns a raw │
│ pointer instead of a safe container like `base::span`, follow this │
│ procedure: │
│ 1. **Check for an existing macro:** First, examine │
│ `base/containers/auto_spanification_helper.h` to see if a macro for │
│ this specific API call already exists. │
│ 2. **Create a new macro if needed:** If no macro exists, you │
│ must add one. │
│ * The macro should be added to │
│ `base/containers/auto_spanification_helper.h`. │
│ * The macro should take the same arguments as the original │
│ API call. │
│ * Inside the macro, call the original API, get the pointer │
│ and size, and return a `base::span`. Use `UNSAFE_TODO` to wrap the │
│ returned span. │
│ * Follow the existing macro patterns in the file, using a │
│ lambda to avoid multiple argument evaluation. │
│ 3. **Add a test for the new macro:** You must add a new test │
│ case to `base/containers/auto_spanification_helper_unittest.cc`. │
│ * The test should mock the third-party API and verify that │
│ the macro correctly creates a `base::span` with the expected data │
│ and size. │
│ 4. **Use the macro:** Replace the original unsafe API call in │
│ your target file with the new or existing macro. │
│ │
│ * **Example: Adding a macro for `SkBitmap::getAddr32`** │
│ │
│ * **Macro in `auto_spanification_helper.h`:** │
│ ```cpp │
│ // https://source.chromium.org/chromium/chromium/src/+/main: │
│ third_party/skia/include/core/SkBitmap.h;drc=f72bd467feb15edd9323e46 │
│ eab1b74ab6025bc5b;l=936 │
│ #define UNSAFE_SKBITMAP_GETADDR32(arg_self, arg_x, arg_y) \ │
│ ([](auto&& self, int x, int y) { \ │
│ uint32_t* row = self->getAddr32(x, y); \ │
│ ::base::CheckedNumeric<size_t> width = self->width(); \ │
│ size_t size = (width - x).ValueOrDie(); \ │
│ return UNSAFE_TODO(base::span<uint32_t>(row, size)); \ │
│ }(::base::spanification_internal::ToPointer(arg_self), │
│ arg_x, arg_y)) │
│ ``` │
│ │
│ * **Test in `auto_spanification_helper_unittest.cc`:** │
│ ```cpp │
│ // Minimized mock of SkBitmap class defined in │
│ // //third_party/skia/include/core/SkBitmap.h │
│ class SkBitmap { │
│ public: │
│ uint32_t* getAddr32(int x, int y) const { return &row_[x]; │
│ } │
│ int width() const { return static_cast<int>(row_.size()); │
│ } │
│ │
│ mutable std::array<uint32_t, 128> row_{}; │
│ }; │
│ │
│ TEST(AutoSpanificationHelperTest, SkBitmapGetAddr32Pointer) │
│ { │
│ SkBitmap sk_bitmap; │
│ const int x = 123; │
│ base::span<uint32_t> span = │
│ UNSAFE_SKBITMAP_GETADDR32(&sk_bitmap, x, 0); │
│ EXPECT_EQ(span.data(), &sk_bitmap.row_[x]); │
│ EXPECT_EQ(span.size(), sk_bitmap.row_.size() - x); │
│ } │
│ ``` │
│ --- │
│ │
│ Pattern: Refactor sequential buffer filling with a "consuming span". │
│ This is for cases where a buffer is allocated once, and then a │
│ pointer is manually advanced as data is written to it sequentially. │
│ │
│ Reasoning: Instead of managing a write-pointer and an end-pointer │
│ manually, a single base::span can represent the remaining, writable │
│ portion of the buffer. This is safer and more expressive. │
│ │
│ Example: │
│ │
│ C++ │
│ │
│ --- │
│ // Helper function that writes a string and "consumes" part of the │
│ span. │
│ void WriteStringAndAdvance(base::span<char>& buffer, const char* │
│ str) { │
│ if (!str) { │
│ return; │
│ } │
│ const size_t len_with_null = strlen(str) + 1; │
│ DCHECK_GE(buffer.size(), len_with_null); │
│ memcpy(buffer.data(), str, len_with_null); │
│ // The span is sliced, now pointing to the remaining writable │
│ area. │
│ buffer = buffer.subspan(len_with_null); │
│ } │
│ │
│ // Old function that manually manages pointers. │
│ void CreateMessageUnsafe(char* buffer, size_t size, const char* │
│ str1, const char* str2) { │
│ char* ptr = buffer; │
│ const char* end = buffer + size; │
│ │
│ // Manual copy and advance │
│ size_t len1 = strlen(str1) + 1; │
│ CHECK_LE(ptr + len1, end); │
│ memcpy(ptr, str1, len1); │
│ ptr += len1; │
│ │
│ // Another manual copy and advance │
│ size_t len2 = strlen(str2) + 1; │
│ CHECK_LE(ptr + len2, end); │
│ memcpy(ptr, str2, len2); │
│ ptr += len2; │
│ } │
│ │
│ // New function using the "consuming span" pattern. │
│ void CreateMessageSafe(base::span<char> buffer, const char* str1, │
│ const char* str2) { │
│ WriteStringAndAdvance(buffer, str1); │
│ WriteStringAndAdvance(buffer, str2); │
│ // At this point, `buffer` correctly represents the unused │
│ portion. │
│ } │
│ Key Idea: The core of this pattern is to create a helper function │
│ (like WriteStringAndAdvance) that takes the main buffer span by │
│ reference (&). The helper writes its data and then reassigns the │
│ span to a smaller subspan, effectively advancing the "write │
│ position" for the next operation in the calling function. │
│ --- │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Okay, I will finish the patch. First, I'll examine the current state of
the patch.
╭──────────────────────────────────────────────────────╮
│ ✔ Shell git show HEAD (Examine the current patch.) │
│ │
│ ... first 895 lines hidden ... │
│ vector_math::FCLAMP_SSE(input_array_, │
│ kVectorSize, │
│ + │
│ output_array_); │
│ │
│ VerifyClampOutput(kClampedOutputValues) │
│ ; │
│ } │
│ { │
│ @@ -246,8 +246,8 @@ │
│ TEST_F(VectorMathTest, FCLAMP) { │
│ if (cpu.has_avx()) { │
│ SCOPED_TRACE("FCLAMP_AVX"); │
│ │
│ FillTestClampingVectors(kUnclampedInput │
│ Values, kOutputFillValue); │
│ - │
│ vector_math::FCLAMP_AVX(input_array_.da │
│ ta(), kVectorSize, │
│ - │
│ output_array_.data()); │
│ + │
│ vector_math::FCLAMP_AVX(input_array_, │
│ kVectorSize, │
│ + │
│ output_array_); │
│ │
│ VerifyClampOutput(kClampedOutputValues) │
│ ; │
│ } │
│ } │
│ @@ -387,7 +387,7 @@ class │
│ EWMATestScenario { │
│ { │
│ │
│ SCOPED_TRACE("EWMAAndMaxPower_C"); │
│ const std::pair<float, float>& │
│ result = │
│ vector_math::EWMAAndMaxPower_C( │
│ - initial_value_, │
│ data_.data(), data_.size(), │
│ smoothing_factor_); │
│ + initial_value_, data_, │
│ data_.size(), smoothing_factor_); │
│ EXPECT_NEAR(expected_final_avg_, │
│ result.first, 0.0000001f); │
│ EXPECT_NEAR(expected_max_, │
│ result.second, 0.0000001f); │
│ } │
│ @@ -396,7 +396,7 @@ class │
│ EWMATestScenario { │
│ { │
│ │
│ SCOPED_TRACE("EWMAAndMaxPower_SSE"); │
│ const std::pair<float, float>& │
│ result = │
│ vector_math::EWMAAndMaxPower_SSE( │
│ - initial_value_, │
│ data_.data(), data_.size(), │
│ smoothing_factor_); │
│ + initial_value_, data_, │
│ data_.size(), smoothing_factor_); │
│ EXPECT_NEAR(expected_final_avg_, │
│ result.first, 0.0000001f); │
│ EXPECT_NEAR(expected_max_, │
│ result.second, 0.0000001f); │
│ } │
│ @@ -405,7 +405,7 @@ class │
│ EWMATestScenario { │
│ if (cpu.has_avx2() && │
│ cpu.has_fma3()) { │
│ │
│ SCOPED_TRACE("EWMAAndMaxPower_AVX2"); │
│ const std::pair<float, float>& │
│ result = │
│ - │
│ vector_math::EWMAAndMaxPower_AVX2(initi │
│ al_value_, data_.data(), │
│ + │
│ vector_math::EWMAAndMaxPower_AVX2(initi │
│ al_value_, data_, │
│ │
│ data_.size(), │
│ smoothing_factor_); │
│ │
│ EXPECT_NEAR(expected_final_avg_, │
│ result.first, 0.0000001f); │
│ EXPECT_NEAR(expected_max_, │
│ result.second, 0.0000001f); │
│ │
╰──────────────────────────────────────────────────────╯
✦ The patch has started the migration to base::span, but the SSE/AVX
implementations are still using unsafe pointer arithmetic. The attempted
fix is verbose and incorrect. Additionally, the len parameter is now
redundant in many functions and should be marked as such.
My plan is as follows:
1. Read media/base/vector_math.cc, media/base/vector_math_testing.h, and
media/base/vector_math_unittest.cc.
2. Remove the #pragma allow_unsafe_buffers in media/base/vector_math.cc.
3. Correct the unsafe pointer arithmetic in the SSE/AVX functions using
subspan().
4. Mark the redundant len parameters for future removal.
5. Compile and run tests to verify the changes.
I will now read the files.call:read_file{absolute_path:
╭────────────────────────────────────────╮
│ ✔ ReadFile media/base/vector_math.cc │
╰────────────────────────────────────────╯
╭───────────────────────────────────────────────╮
│ ✔ ReadFile media/base/vector_math_testing.h │
╰───────────────────────────────────────────────╯
╭─────────────────────────────────────────────────╮
│ ✔ ReadFile media/base/vector_math_unittest.cc │
╰─────────────────────────────────────────────────╯
✦ Okay, files read. Removing #pragma allow_unsafe_buffers from
media/base/vector_math.cc now.
╭────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: #ifdef UNSAFE_BUFFERS_BUILD... => │
│ │
│ 6 #include "base/containers/span.h" │
│ 7 #include │
│ "base/numerics/safe_conversions.h" │
│ 8 │
│ 9 - #ifdef UNSAFE_BUFFERS_BUILD │
│ 10 - // TODO(crbug.com/40285824): │
│ Remove this and convert code to │
│ safer constructs. │
│ 11 - #pragma allow_unsafe_buffers │
│ 12 - #endif │
│ 9 │
│ 10 + │
│ 11 #include │
│ "media/base/vector_math.h" │
│ 12 │
│ 13 #include <algorithm> │
╰────────────────────────────────────────────────────────────────────────╯
✦ Pragma removed. Now, I'm fixing unsafe buffer usage in
media/base/vector_math.cc by replacing pointer arithmetic in SSE/AVX
functions with subspan, starting with FMUL_SSE. I'll also mark redundant
len parameters.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: void FMUL_SSE(base::span<const... =>… │
│ │
│ 171 } │
│ 172 │
│ 173 #if defined(ARCH_CPU_X86_FAMILY) │
│ 174 - void FMUL_SSE(base::span<const │
│ float> src, float scale, int len, │
│ base::span<float> dest) { │
│ 174 + void FMUL_SSE(base::span<const │
│ float> src, │
│ 175 + float scale, │
│ 176 + int len, │
│ 177 + base::span<float> │
│ dest) { │
│ 178 + // TODO(crbug.com/431824301): │
│ Remove unneeded parameter once │
│ validated to be │
│ 179 + // redundant in M143. │
│ 180 + CHECK(len == src.size(), │
│ base::NotFatalUntil::M143); │
│ 181 const int rem = len % 4; │
│ 182 const int last_index = len - │
│ rem; │
│ 183 __m128 m_scale = │
│ _mm_set_ps1(scale); │
│ 184 for (int i = 0; i < last_index; │
│ i += 4) { │
│ 179 - _mm_store_ps(base │
│ ::span<float>(dest ).subspan(base │
│ ::checked_cast<size_t>( i)).data(), │
│ _mm_mul_ps(_mm_load_ps(base │
│ ::span<const float>(src ).subspan( │
│ base::checked_cast<size_t>( i)). │
│ data()), m_scale)); │
│ 185 + _mm_store_ps(dest.subspan(i) │
│ .data(), │
│ 186 + _mm_mul_ps( │
│ _mm_load_ps(src.subspan(i).data()), │
│ m_scale)); │
│ 187 } │
│ 188 │
│ 189 // Handle any remaining values │
│ that wouldn't fit in an SSE pass. │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Fixed FMUL_SSE, marked len redundant. Now fixing FMUL_AVX2, including the
incorrect alignment check on src, which should be src.data().
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: __attribute__((target("avx2"))... =>… │
│ │
│ ... first 17 lines hidden ... │
│ 205 // TODO(crbug.com/40756517): │
│ Remove below alignment │
│ conditionals when AudioBus │
│ 206 // |kChannelAlignment| updated to │
│ 32. │
│ 204 - bool aligned_src = │
│ (reinterpret_cast<uintptr_t>(src) & │
│ 0x1F) == 0; │
│ 205 - bool aligned_dest = │
│ (reinterpret_cast<uintptr_t>(dest) │
│ & 0x1F) == 0; │
│ 207 + bool aligned_src = │
│ (reinterpret_cast<uintptr_t>(src.da │
│ ta()) & 0x1F) == 0; │
│ 208 + bool aligned_dest = │
│ (reinterpret_cast<uintptr_t>(dest.d │
│ ata()) & 0x1F) == 0; │
│ 209 if (aligned_src) { │
│ 210 if (aligned_dest) { │
│ 211 for (int i = 0; i < │
│ last_index; i += 8) { │
│ 209 - _mm256_store_ps(base │
│ ::span<float>(dest ).subspan(base │
│ ::checked_cast<size_t>( i)).data(), │
│ 210 - │
│ _mm256_mul_ps(_mm256_load_ps(base │
│ ::span<const float>(src ).subspan( │
│ base::checked_cast<size_t>( i)). │
│ data()), m_scale)); │
│ 212 + _mm256_store_ps( │
│ 213 + dest.subspan(i).data(), │
│ 214 + _mm256_mul_ps( │
│ _mm256_load_ps(src.subspan(i).data │
│ ()), m_scale)); │
│ 215 } │
│ 216 } else { │
│ 217 for (int i = 0; i < │
│ last_index; i += 8) { │
│ 214 - _mm256_storeu_ps(base │
│ ::span<float>(dest ).subspan(base │
│ ::checked_cast<size_t>( i)).data(), │
│ 215 - │
│ _mm256_mul_ps(_mm256_load_ps(base │
│ ::span<const float>(src ).subspan( │
│ base::checked_cast<size_t>( i)). │
│ data()), m_scale)); │
│ 218 + _mm256_storeu_ps( │
│ 219 + dest.subspan(i).data(), │
│ 220 + _mm256_mul_ps( │
│ _mm256_load_ps(src.subspan(i).data │
│ ()), m_scale)); │
│ 221 } │
│ 222 } │
│ 223 } else { │
│ 224 if (aligned_dest) { │
│ 225 for (int i = 0; i < │
│ last_index; i += 8) { │
│ 221 - _mm256_store_ps(base │
│ ::span<float>(dest ).subspan(base │
│ ::checked_cast<size_t>( i)).data(), │
│ 222 - │
│ _mm256_mul_ps(_mm256_loadu_ps(base │
│ ::span<const float>(src ).subspan( │
│ base::checked_cast<size_t>( i)). │
│ data()), m_scale)); │
│ 226 + _mm256_store_ps( │
│ 227 + dest.subspan(i).data(), │
│ 228 + _mm256_mul_ps( │
│ _mm256_loadu_ps(src.subspan(i).data │
│ ()), m_scale)); │
│ 229 } │
│ 230 } else { │
│ 231 for (int i = 0; i < │
│ last_index; i += 8) { │
│ 226 - _mm256_storeu_ps(base │
│ ::span<float>(dest ).subspan(base │
│ ::checked_cast<size_t>( i)).data(), │
│ 227 - │
│ _mm256_mul_ps(_mm256_loadu_ps(base │
│ ::span<const float>(src ).subspan( │
│ base::checked_cast<size_t>( i)). │
│ data()), m_scale)); │
│ 232 + _mm256_storeu_ps( │
│ 233 + dest.subspan(i).data(), │
│ 234 + _mm256_mul_ps( │
│ _mm256_loadu_ps(src.subspan(i).data │
│ ()), m_scale)); │
│ 235 } │
│ 236 } │
│ 237 } │
╰──────────────────────────────────────────────────────────────────────────╯
✦ FMAC_SSE, let's do it.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: void FMAC_SSE(base::span<const... =>… │
│ │
│ 242 } │
│ 243 } │
│ 244 │
│ 245 - void FMAC_SSE(base::span<const │
│ float> src, float scale, int len, │
│ base::span<float> dest) { │
│ 245 + void FMAC_SSE(base::span<const │
│ float> src, │
│ 246 + float scale, │
│ 247 + int len, │
│ 248 + base::span<float> │
│ dest) { │
│ 249 + // TODO(crbug.com/431824301): │
│ Remove unneeded parameter once │
│ validated to be │
│ 250 + // redundant in M143. │
│ 251 + CHECK(len == src.size(), │
│ base::NotFatalUntil::M143); │
│ 252 const int rem = len % 4; │
│ 253 const int last_index = len - │
│ rem; │
│ 254 __m128 m_scale = │
│ _mm_set_ps1(scale); │
│ 255 for (int i = 0; i < last_index; │
│ i += 4) { │
│ 250 - _mm_store_ps(base │
│ ::span<float>(dest ).subspan(base │
│ ::checked_cast<size_t>( i)).data(), │
│ 251 - _mm_add_ps( │
│ _mm_load_ps(base::span<float>(dest │
│ ).subspan(base │
│ ::checked_cast<size_t>( i)).data │
│ ()), │
│ 252 - │
│ _mm_mul_ps(_mm_load_ps(base │
│ ::span<const float>(src ).subspan( │
│ base::checked_cast<size_t>( i)). │
│ data()), m_scale))); │
│ 256 + _mm_store_ps( │
│ 257 + dest.subspan(i).data(), │
│ 258 + _mm_add_ps(_mm_load_ps │
│ (dest.subspan(i).data()), │
│ 259 + _mm_mul_ps( │
│ _mm_load_ps(src.subspan(i).data()), │
│ m_scale))); │
│ 260 } │
│ 261 │
│ 262 // Handle any remaining values │
│ that wouldn't fit in an SSE pass. │
╰──────────────────────────────────────────────────────────────────────────╯
╭──────────────────────────────────────────────────────────────────────────╮
│ x Edit {"file_path":"/usrlocal/google/home/keishi/gemini-run/workdirs/… │
│ │
│ File path must be within one of the │
│ workspace directories: │
│ /usr/local/google/home/keishi/gemini-ru │
│ n/workdirs/chromium1/src │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Okay, FMAC_AVX2 is next. Fixing alignment.
✦ Typo. Correcting path.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: __attribute__((target("avx2,fm... =>… │
│ │
│ ... first 51 lines hidden ... │
│ 285 + _mm256_store_ps │
│ (dest.subspan(i).data(), │
│ 286 + │
│ _mm256_fmadd_ps(_mm256_load_ps(src. │
│ subspan(i).data()), │
│ 287 + │
│ m_scale, │
│ 288 + │
│ _mm256_load_ps(dest.subspan(i).data │
│ ()))); │
│ 289 } │
│ 290 } else { │
│ 291 for (int i = 0; i < │
│ last_index; i += 8) { │
│ 288 - _mm256_storeu_ps(base │
│ ::span<float>(dest ).subspan(base │
│ ::checked_cast<size_t>( i)).data(), │
│ 289 - │
│ _mm256_fmadd_ps(_mm256_load_ps(base │
│ ::span<const float>(src ).subspan( │
│ base::checked_cast<size_t>( i)). │
│ data()), m_scale, │
│ 290 - │
│ _mm256_loadu_ps(base │
│ ::span<float>(dest ).subspan(base │
│ ::checked_cast<size_t>( i)).data │
│ ()))); │
│ 292 + _mm256_storeu_ps( │
│ 293 + dest.subspan(i).data(), │
│ 294 + _mm256_fmadd_ps( │
│ _mm256_load_ps(src.subspan(i).data │
│ ()), m_scale, │
│ 295 + │
│ _mm256_loadu_ps(dest.subspan(i) │
│ .data()))); │
│ 296 } │
│ 297 } │
│ 298 } else { │
│ 299 if (aligned_dest) { │
│ 300 for (int i = 0; i < │
│ last_index; i += 8) { │
│ 296 - _mm256_store_ps(base │
│ ::span<float>(dest ).subspan(base │
│ ::checked_cast<size_t>( i)).data(), │
│ 297 - │
│ _mm256_fmadd_ps(_mm256_loadu_ps( │
│ base::span<const float>(src ). │
│ subspan(base::checked_cast<size_t>( │
│ i)).data()), m_scale, │
│ 298 - │
│ _mm256_load_ps(base │
│ ::span<float>(dest ).subspan(base │
│ ::checked_cast<size_t>( i)).data │
│ ()))); │
│ 301 + _mm256_store_ps( │
│ 302 + dest.subspan(i).data(), │
│ 303 + _mm256_fmadd_ps( │
│ _mm256_loadu_ps(src.subspan(i).data │
│ ()), m_scale, │
│ 304 + │
│ _mm256_load_ps(dest.subspan(i).data │
│ ()))); │
│ 305 } │
│ 306 } else { │
│ 307 for (int i = 0; i < │
│ last_index; i += 8) { │
│ 302 - _mm256_storeu_ps(base │
│ ::span<float>(dest ).subspan(base │
│ ::checked_cast<size_t>( i)).data(), │
│ 303 - │
│ _mm256_fmadd_ps(_mm256_loadu_ps( │
│ base::span<const float>(src ). │
│ subspan(base::checked_cast<size_t>( │
│ i)).data()), m_scale, │
│ 304 - │
│ _mm256_loadu_ps(base │
│ ::span<float>(dest ).subspan(base │
│ ::checked_cast<size_t>( i)).data │
│ ()))); │
│ 308 + _mm256_storeu_ps( │
│ 309 + dest.subspan(i).data(), │
│ 310 + _mm256_fmadd_ps( │
│ _mm256_loadu_ps(src.subspan(i).data │
│ ()), m_scale, │
│ 311 + │
│ _mm256_loadu_ps(dest.subspan(i) │
│ .data()))); │
│ 312 } │
│ 313 } │
│ 314 } │
╰──────────────────────────────────────────────────────────────────────────╯
✦ FCLAMP_SSE is next.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: void FCLAMP_SSE(base::span<con... =>… │
│ │
│ 318 dest[i] += src[i] * scale; │
│ 319 } │
│ 320 } │
│ 321 - void FCLAMP_SSE(base::span<const │
│ float> src, int len, base::span< │
│ float> dest) { │
│ 321 + void FCLAMP_SSE(base::span<const │
│ float> src, │
│ 322 + int len, │
│ 323 + base::span< │
│ float> dest) { │
│ 324 + // TODO(crbug.com/431824301): │
│ Remove unneeded parameter once │
│ validated to be │
│ 325 + // redundant in M143. │
│ 326 + CHECK(len == src.size(), │
│ base::NotFatalUntil::M143); │
│ 327 const int rem = len % 4; │
│ 328 const int last_index = len - │
│ rem; │
│ 329 const __m128 m_min = │
│ _mm_set_ps1(kClampMin); │
│ 330 const __m128 m_max = │
│ _mm_set_ps1(kClampMax); │
│ 331 for (int i = 0; i < last_index; │
│ i += 4) { │
│ 327 - const __m128 values = │
│ _mm_load_ps(base::span<const float │
│ >(src ).subspan(base │
│ ::checked_cast<size_t>( │
│ i)).data()); │
│ 332 + const __m128 values = │
│ _mm_load_ps(src.subspan(i).data()); │
│ 333 // Compare each value with │
│ itself. Since NaN != NaN, we end │
│ up with a mask │
│ 334 // with 0s instead of NaNs, │
│ and 1s for the original values. │
│ 335 const __m128 comparisons = │
│ _mm_cmpeq_ps(values, values); │
│ 336 // Zero-out all NaNs by │
│ applying the mask with a logical │
│ AND. │
│ 337 const __m128 sanitized_values │
│ = _mm_and_ps(comparisons, values) │
│ ; │
│ 333 - _mm_store_ps(base │
│ ::span<float>(dest ).subspan(base │
│ ::checked_cast<size_t>( i)).data(), │
│ 338 + _mm_store_ps(dest.subspan(i) │
│ .data(), │
│ 339 _mm_min_ps │
│ (_mm_max_ps(sanitized_values, │
│ m_min), m_max)); │
│ 340 } │
│ 341 │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Okay, FCLAMP_AVX next, alignment fixes included.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: __attribute__((target("avx")))... =>… │
│ │
│ ... first 44 lines hidden ... │
│ <size_t>( i)).data(), │
│ 379 + dest.subspan(i).data │
│ (), │
│ 380 _mm256_max_ps( │
│ 378 - _mm256_min_ps( │
│ SanitizeNan(_mm256_load_ps(base │
│ ::span<const float>(src ).subspan( │
│ base::checked_cast<size_t>( i)). │
│ data())), m_max), │
│ 381 + _mm256_min_ps( │
│ SanitizeNan(_mm256_load_ps(src. │
│ subspan(i).data())), │
│ 382 + │
│ m_max), │
│ 383 m_min)); │
│ 384 } │
│ 385 } else { │
│ 386 for (int i = 0; i < │
│ last_index; i += 8) { │
│ 387 _mm256_storeu_ps( │
│ 384 - base::span<float │
│ >(dest ).subspan(base::checked_cast │
│ <size_t>( i)).data(), │
│ 388 + dest.subspan(i).data │
│ (), │
│ 389 _mm256_max_ps( │
│ 386 - _mm256_min_ps( │
│ SanitizeNan(_mm256_load_ps(base │
│ ::span<const float>(src ).subspan( │
│ base::checked_cast<size_t>( i)). │
│ data())), m_max), │
│ 390 + _mm256_min_ps( │
│ SanitizeNan(_mm256_load_ps(src. │
│ subspan(i).data())), │
│ 391 + │
│ m_max), │
│ 392 m_min)); │
│ 393 } │
│ 394 } │
│ 396 if (aligned_dest) { │
│ 397 for (int i = 0; i < │
│ last_index; i += 8) { │
│ 398 _mm256_store_ps( │
│ 394 - base::span<float │
│ >(dest ).subspan(base::checked_cast │
│ <size_t>( i)).data(), │
│ 395 - _mm256_max_ps( │
│ 396 - _mm256_min_ps( │
│ SanitizeNan(_mm256_loadu_ps(base │
│ ::span<const float>(src ).subspan( │
│ base::checked_cast<size_t>( i)). │
│ data())), m_max), │
│ 399 + dest.subspan(i).data │
│ (), │
│ 400 + _mm256_max_ps( │
│ _mm256_min_ps(SanitizeNan( │
│ _mm256_loadu_ps( │
│ 401 + │
│ src.subspan(i).data())), │
│ 402 + │
│ m_max), │
│ 403 m_min)) │
│ ; │
│ 404 } │
│ 405 } else { │
│ 406 for (int i = 0; i < │
│ last_index; i += 8) { │
│ 407 _mm256_storeu_ps( │
│ 402 - base::span<float │
│ >(dest ).subspan(base::checked_cast │
│ <size_t>( i)).data(), │
│ 403 - _mm256_max_ps( │
│ 404 - _mm256_min_ps( │
│ SanitizeNan(_mm256_loadu_ps(base │
│ ::span<const float>(src ).subspan( │
│ base::checked_cast<size_t>( i)). │
│ data())), m_max), │
│ 408 + dest.subspan(i).data │
│ (), │
│ 409 + _mm256_max_ps( │
│ _mm256_min_ps(SanitizeNan( │
│ _mm256_loadu_ps( │
│ 410 + │
│ src.subspan(i).data())), │
│ 411 + │
│ m_max), │
│ 412 m_min)) │
│ ; │
│ 413 } │
│ 414 } │
╰──────────────────────────────────────────────────────────────────────────╯
✦ EWMAAndMaxPower_SSE is next.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: std::pair<float, float> EWMAAn... =>… │
│ │
│ 433 │
│ base::span<const float> │
│ src, │
│ 434 │
│ int len, │
│ 435 │
│ float smoothing_factor) │
│ { │
│ 436 + // TODO(crbug.com/431824301): │
│ Remove unneeded parameter once │
│ validated to be │
│ 437 + // redundant in M143. │
│ 438 + CHECK(len == src.size(), │
│ base::NotFatalUntil::M143); │
│ 439 // When the recurrence is │
│ unrolled, we see that we can │
│ split it into 4 │
│ 440 // separate lanes of evaluation: │
│ 441 // │
│ ═══════════════════════════════════════ │
│ 466 int i; │
│ 467 for (i = 0; i < last_index; i += │
│ 4) { │
│ 468 ewma_x4 = _mm_mul_ps(ewma_x4, │
│ weight_prev_4th_x4); │
│ 466 - const __m128 sample_x4 = │
│ _mm_load_ps(base::span<const float │
│ >(src ).subspan(base │
│ ::checked_cast<size_t>( │
│ i)).data()); │
│ 469 + const __m128 sample_x4 = │
│ _mm_load_ps(src.subspan(i).data()); │
│ 470 const __m128 sample_squared_x4 │
│ = _mm_mul_ps(sample_x4, │
│ sample_x4); │
│ 471 max_x4 = _mm_max_ps(max_x4, │
│ sample_squared_x4); │
│ 472 // Note: The compiler optimizes │
│ this to a single │
│ multiply-and-accumulate │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Okay, EWMAAndMaxPower_AVX2 with alignment fix, next.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: __attribute__((target("avx2,fm... =>… │
│ │
│ 508 base::span< │
│ const float> src, │
│ 509 int len, │
│ 510 float │
│ smoothing_factor) { │
│ 511 + // TODO(crbug.com/431824301): │
│ Remove unneeded parameter once │
│ validated to be │
│ 512 + // redundant in M143. │
│ 513 + CHECK(len == src.size(), │
│ base::NotFatalUntil::M143); │
│ 514 const int rem = len % 8; │
│ 515 const int last_index = len - rem; │
│ 516 const float weight_prev = 1.0f - │
│ smoothing_factor; │
│ ═══════════════════════════════════════ │
│ 539 __m256 res = │
│ _mm256_set_ps(initial_value, 0, 0 │
│ , 0, 0, 0, 0, 0); │
│ 540 __m256 res_coeff = !weight_prev ? │
│ _mm256_set1_ps(0) │
│ 541 : │
│ _mm256_set1_ps(std::pow │
│ (weight_prev, 8)); │
│ 539 - bool aligned_src = │
│ (reinterpret_cast<uintptr_t>(src) & │
│ 0x1F) == 0; │
│ 542 + bool aligned_src = │
│ (reinterpret_cast<uintptr_t>(src.da │
│ ta()) & 0x1F) == 0; │
│ 543 int i = 0; │
│ 544 for (; i < last_index; i += 8) { │
│ 545 __m256 sample = │
│ 543 - aligned_src ? │
│ _mm256_load_ps(base::span<const │
│ float>(src ).subspan(base │
│ ::checked_cast<size_t>( i)).data()) │
│ : _mm256_loadu_ps(base::span<const │
│ float>(src ).subspan(base │
│ ::checked_cast<size_t>( │
│ i)).data()); │
│ 546 + aligned_src ? │
│ _mm256_load_ps(src.subspan(i).data │
│ ()) │
│ 547 + : │
│ _mm256_loadu_ps(src.subspan(i).data │
│ ()); │
│ 548 __m256 sample_x2 = │
│ _mm256_mul_ps(sample, sample); │
│ 549 max = _mm256_max_ps(max, │
│ sample_x2); │
│ 550 res = │
│ _mm256_fmadd_ps(sample_x2, │
│ sum_coeff, _mm256_mul_ps(res, │
│ res_coeff)); │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Fixed SSE/AVX functions in vector_math.cc, marking the len parameter
redundant. Now doing the same for the C versions: FMAC_C, FMUL_C,
FCLAMP_C, and EWMAAndMaxPower_C.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: void FMAC_C(base::span<const f... =>… │
│ │
│ 63 return fmac_func(src.data(), │
│ scale, src.size(), dest.data()); │
│ 64 } │
│ 65 │
│ 66 - void FMAC_C(base::span<const float │
│ > src, float scale, int len, base │
│ ::span<float> dest) { │
│ 66 + void FMAC_C(base::span<const float │
│ > src, │
│ 67 + float scale, │
│ 68 + int len, │
│ 69 + base::span<float> │
│ dest) { │
│ 70 + // TODO(crbug.com/431824301): │
│ Remove unneeded parameter once │
│ validated to be │
│ 71 + // redundant in M143. │
│ 72 + CHECK(len == src.size(), │
│ base::NotFatalUntil::M143); │
│ 73 for (int i = 0; i < len; ++i) { │
│ 74 dest[i] += src[i] * scale; │
│ 75 } │
╰──────────────────────────────────────────────────────────────────────────╯
✦ FMUL_C
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: void FMUL_C(base::span<const f... =>… │
│ │
│ 98 return fmul_func(src.data(), │
│ scale, src.size(), dest.data()); │
│ 99 } │
│ 100 │
│ 101 - void FMUL_C(base::span<const │
│ float> src, float scale, int len, │
│ base::span<float> dest) { │
│ 101 + void FMUL_C(base::span<const │
│ float> src, │
│ 102 + float scale, │
│ 103 + int len, │
│ 104 + base::span<float> │
│ dest) { │
│ 105 + // TODO(crbug.com/431824301): │
│ Remove unneeded parameter once │
│ validated to be │
│ 106 + // redundant in M143. │
│ 107 + CHECK(len == src.size(), │
│ base::NotFatalUntil::M143); │
│ 108 for (int i = 0; i < len; ++i) { │
│ 109 dest[i] = src[i] * scale; │
│ 110 } │
╰──────────────────────────────────────────────────────────────────────────╯
✦ FCLAMP_C
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: void FCLAMP_C(base::span<const... =>… │
│ │
│ 134 } │
│ 135 │
│ 136 void FCLAMP_C(base::span<const │
│ float> src, int len, base::span< │
│ float> dest) { │
│ 137 + // TODO(crbug.com/431824301): │
│ Remove unneeded parameter once │
│ validated to be │
│ 138 + // redundant in M143. │
│ 139 + CHECK(len == src.size(), │
│ base::NotFatalUntil::M143); │
│ 140 for (int i = 0; i < len; ++i) { │
│ 141 const float sample = src[i]; │
│ 142 const float temp = std │
│ ::isnan(sample) ? kSilence : │
│ sample; │
╰──────────────────────────────────────────────────────────────────────────╯
✦ EWMAAndMaxPower_C
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: std::pair<float, float> EWMAAn... =>… │
│ │
│ 173 │
│ base::span<const float> │
│ src, │
│ 174 │
│ int len, │
│ 175 │
│ float smoothing_factor) { │
│ 176 + // TODO(crbug.com/431824301): │
│ Remove unneeded parameter once │
│ validated to be │
│ 177 + // redundant in M143. │
│ 178 + CHECK(len == src.size(), │
│ base::NotFatalUntil::M143); │
│ 179 std::pair<float, float> result │
│ (initial_value, 0.0f); │
│ 180 const float weight_prev = 1.0f - │
│ smoothing_factor; │
│ 181 for (int i = 0; i < len; ++i) { │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Okay, I've updated all vector_math.cc functions with the redundant len
parameter. Now, I'll modify FMAC, FMUL, FCLAMP, and EWMAAndMaxPower to
pass the span directly, starting with FMAC.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: return fmac_func(src.data(),... =>… │
│ │
│ 60 #endif │
│ 61 }(); │
│ 62 │
│ 63 - return fmac_func(src.data(), │
│ scale, src.size(), dest.data()); │
│ 63 + return fmac_func(src, scale, src │
│ .size(), dest); │
│ 64 } │
│ 65 │
│ 66 void FMAC_C(base::span<const float │
│ > src, │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Okay, FMUL.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: return fmul_func(src.data(),... =>… │
│ │
│ 95 #endif │
│ 96 }(); │
│ 97 │
│ 98 - return fmul_func(src.data(), │
│ scale, src.size(), dest.data()); │
│ 98 + return fmul_func(src, scale, │
│ src.size(), dest); │
│ 99 } │
│ 100 │
│ 101 void FMUL_C(base::span<const │
│ float> src, │
╰──────────────────────────────────────────────────────────────────────────╯
✦ FCLAMP. Done. Next.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: return fclamp_func(src.data(... =>… │
│ │
│ 130 #endif │
│ 131 }(); │
│ 132 │
│ 133 - return fclamp_func(src.data(), │
│ src.size(), dest.data()); │
│ 133 + return fclamp_func(src, src │
│ .size(), dest); │
│ 134 } │
│ 135 │
│ 136 void FCLAMP_C(base::span<const │
│ float> src, int len, base::span< │
│ float> dest) { │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Okay, EWMAAndMaxPower next.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: return ewma_and_max_power_fu... =>… │
│ │
│ 165 #endif │
│ 166 }(); │
│ 167 │
│ 168 - return ewma_and_max_power_func │
│ (initial_value, src.data(), src │
│ .size(), │
│ 168 + return │
│ ewma_and_max_power_func(initial_val │
│ ue, src, src.size(), │
│ 169 │
│ smoothing_factor); │
│ 170 } │
│ 171 │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Finished vector_math.cc, now updating vector_math_unittest.cc. The
FCLAMP_remainder_data test is broken because run_per_value_clamp_test
expects a const float[] but now receives a base::span. I'll update the
test to accept a base::span.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math_unittest.cc: const auto run_per_value_… │
│ │
│ 272 static constexpr float │
│ kGuardValue = 123.0f; │
│ 273 │
│ 274 const auto │
│ run_per_value_clamp_test = │
│ 275 - [&](void (*fn)(const float[], │
│ int, float[])) { │
│ 275 + [&](void (*fn)(base::span< │
│ const float>, int, base::span<float │
│ >)) { │
│ 276 for (auto [input, output] : │
│ 277 base::zip │
│ (kUnclampedInputValues, │
│ kClampedOutputValues)) { │
│ 278 input_array_[0] = input; │
│ 279 output_array_[0] = │
│ kGuardValue; │
│ 280 - fn(input_array_.data(), │
│ kSmallVectorSize, │
│ output_array_.data()); │
│ 280 + fn(input_array_, │
│ kSmallVectorSize, output_array_); │
│ 281 EXPECT_EQ(output_array_ │
│ [0], output); │
│ 282 } │
│ 283 }; │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Okay, I'm updating vector_math_unittest.cc and vector_math_testing.h. The
NEON function calls still use const float[], so I'm switching them to
base::span, starting with vector_math_testing.h.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math_testing.h: MEDIA_EXPORT void FMAC_NEON(c… │
│ │
│ 55 #endif │
│ 56 │
│ 57 #if defined(ARCH_CPU_ARM_FAMILY) │
│ && defined(USE_NEON) │
│ 58 - MEDIA_EXPORT void FMAC_NEON(const │
│ float src[], │
│ 58 + MEDIA_EXPORT void FMAC_NEON(base │
│ ::span<const float> src, │
│ 59 float │
│ scale, │
│ 60 int │
│ len, │
│ 61 - float │
│ dest[]); │
│ 62 - MEDIA_EXPORT void FMUL_NEON(const │
│ float src[], │
│ 61 + │
│ base::span<float> dest); │
│ 62 + MEDIA_EXPORT void FMUL_NEON(base │
│ ::span<const float> src, │
│ 63 float │
│ scale, │
│ 64 int │
│ len, │
│ 65 - float │
│ dest[]); │
│ 66 - MEDIA_EXPORT void FCLAMP_NEON( │
│ const float src[], int len, float │
│ dest[]); │
│ 65 + │
│ base::span<float> dest); │
│ 66 + MEDIA_EXPORT void FCLAMP_NEON(base │
│ ::span<const float> src, │
│ 67 + int │
│ len, │
│ 68 + │
│ base::span<float> dest); │
│ 69 MEDIA_EXPORT std::pair<float, │
│ float> EWMAAndMaxPower_NEON( │
│ 70 float initial_value, │
│ 69 - const float src[], │
│ 71 + base::span<const float> src, │
│ 72 int len, │
│ 73 float smoothing_factor); │
│ 74 #endif │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Okay, update NEON function definitions in vector_math.cc: use base::span,
mark len as redundant. Done.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: void FMAC_NEON(const float src... =>… │
│ │
│ 600 #endif │
│ 601 │
│ 602 #if defined(ARCH_CPU_ARM_FAMILY) │
│ && defined(USE_NEON) │
│ 603 - void FMAC_NEON(const float src[], │
│ float scale, int len, float dest[]) │
│ { │
│ 603 + void FMAC_NEON(base::span<const │
│ float> src, │
│ 604 + float scale, │
│ 605 + int len, │
│ 606 + base::span<float │
│ > dest) { │
│ 607 + // TODO(crbug.com/431824301): │
│ Remove unneeded parameter once │
│ validated to be │
│ 608 + // redundant in M143. │
│ 609 + CHECK(len == src.size(), │
│ base::NotFatalUntil::M143); │
│ 610 const int rem = len % 4; │
│ 611 const int last_index = len - │
│ rem; │
│ 612 float32x4_t m_scale = │
│ vmovq_n_f32(scale); │
│ 613 for (int i = 0; i < last_index; │
│ i += 4) { │
│ 608 - vst1q_f32(dest + i, │
│ 609 - vmlaq_f32 │
│ (vld1q_f32(dest + i), vld1q_f32(src │
│ + i), m_scale)); │
│ 614 + vst1q_f32(dest.subspan(i) │
│ .data(), │
│ 615 + vmlaq_f32(vld1q_f32 │
│ (dest.subspan(i).data()), │
│ 616 + vld1q_f32 │
│ (src.subspan(i).data()), m_scale)); │
│ 617 } │
│ 618 │
│ 619 // Handle any remaining values │
│ that wouldn't fit in an NEON │
│ pass. │
╰──────────────────────────────────────────────────────────────────────────╯
✦ FMUL_NEON
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: void FMUL_NEON(const float src... =>… │
│ │
│ 622 } │
│ 623 } │
│ 624 │
│ 625 - void FMUL_NEON(const float src[], │
│ float scale, int len, float dest[]) │
│ { │
│ 625 + void FMUL_NEON(base::span<const │
│ float> src, │
│ 626 + float scale, │
│ 627 + int len, │
│ 628 + base::span<float │
│ > dest) { │
│ 629 + // TODO(crbug.com/431824301): │
│ Remove unneeded parameter once │
│ validated to be │
│ 630 + // redundant in M143. │
│ 631 + CHECK(len == src.size(), │
│ base::NotFatalUntil::M143); │
│ 632 const int rem = len % 4; │
│ 633 const int last_index = len - │
│ rem; │
│ 634 float32x4_t m_scale = │
│ vmovq_n_f32(scale); │
│ 635 for (int i = 0; i < last_index; │
│ i += 4) { │
│ 630 - vst1q_f32(dest + i, │
│ vmulq_f32(vld1q_f32(src + i), │
│ m_scale)); │
│ 636 + vst1q_f32(dest.subspan(i) │
│ .data(), │
│ 637 + vmulq_f32(vld1q_f32 │
│ (src.subspan(i).data()), m_scale)); │
│ 638 } │
│ 639 │
│ 640 // Handle any remaining values │
│ that wouldn't fit in an NEON │
│ pass. │
╰──────────────────────────────────────────────────────────────────────────╯
✦ FCLAMP_NEON
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: void FCLAMP_NEON(const float s... =>… │
│ │
│ 643 } │
│ 644 } │
│ 645 │
│ 646 - void FCLAMP_NEON(const float │
│ src[], int len, float dest[]) { │
│ 646 + void FCLAMP_NEON(base::span<const │
│ float> src, │
│ 647 + int len, │
│ 648 + base::span< │
│ float> dest) { │
│ 649 + // TODO(crbug.com/431824301): │
│ Remove unneeded parameter once │
│ validated to be │
│ 650 + // redundant in M143. │
│ 651 + CHECK(len == src.size(), │
│ base::NotFatalUntil::M143); │
│ 652 const int rem = len % 4; │
│ 653 const int last_index = len - │
│ rem; │
│ 654 const float32x4_t m_min = │
│ vmovq_n_f32(kClampMin); │
│ 655 const float32x4_t m_max = │
│ vmovq_n_f32(kClampMax); │
│ 656 for (int i = 0; i < last_index; │
│ i += 4) { │
│ 652 - const float32x4_t values = │
│ vld1q_f32(src + i); │
│ 657 + const float32x4_t values = │
│ vld1q_f32(src.subspan(i).data()); │
│ 658 │
│ 659 // Compare each value with │
│ itself. Since NaN != NaN, we end │
│ up with a mask │
│ 660 // with 0s instead of NaNs, │
│ and 1s for the original values. │
│ 664 const float32x4_t │
│ sanitized_values = │
│ vreinterpretq_f32_u32( │
│ 665 vandq_u32 │
│ (vreinterpretq_u32_f32(values), │
│ comparisons)); │
│ 666 │
│ 662 - vst1q_f32(dest + i, vminq_f32 │
│ (vmaxq_f32(sanitized_values, m_min) │
│ , m_max)); │
│ 667 + vst1q_f32(dest.subspan(i) │
│ .data(), │
│ 668 + vminq_f32 │
│ (vmaxq_f32(sanitized_values, │
│ m_min), m_max)); │
│ 669 } │
│ 670 │
│ 671 // Handle any remaining values │
│ that wouldn't fit in a NEON pass. │
╰──────────────────────────────────────────────────────────────────────────╯
✦ EWMAAndMaxPower_NEON
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: std::pair<float, float> EWMAAn... =>… │
│ │
│ 678 } │
│ 679 │
│ 680 std::pair<float, float> │
│ EWMAAndMaxPower_NEON(float │
│ initial_value, │
│ 681 - │
│ const float src[], │
│ 681 + │
│ base::span<const float> src, │
│ 682 │
│ int len, │
│ 683 │
│ float │
│ smoothing_factor) { │
│ 684 + // TODO(crbug.com/431824301): │
│ Remove unneeded parameter once │
│ validated to be │
│ 685 + // redundant in M143. │
│ 686 + CHECK(len == src.size(), │
│ base::NotFatalUntil::M143); │
│ 687 // When the recurrence is │
│ unrolled, we see that we can │
│ split it into 4 │
│ 688 // separate lanes of │
│ evaluation: │
│ 689 // │
│ ═══════════════════════════════════════ │
│ 714 int i; │
│ 715 for (i = 0; i < last_index; i │
│ += 4) { │
│ 716 ewma_x4 = vmulq_f32(ewma_x4, │
│ weight_prev_4th_x4); │
│ 714 - const float32x4_t sample_x4 = │
│ vld1q_f32(src + i); │
│ 717 + const float32x4_t sample_x4 = │
│ vld1q_f32(src.subspan(i).data()); │
│ 718 const float32x4_t │
│ sample_squared_x4 = │
│ vmulq_f32(sample_x4, sample_x4); │
│ 719 max_x4 = vmaxq_f32(max_x4, │
│ sample_squared_x4); │
│ 720 ewma_x4 = vmlaq_f32(ewma_x4, │
│ sample_squared_x4, │
│ smoothing_factor_x4); │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Okay, NEON definitions updated. Now, update vector_math_unittest.cc calls.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math_unittest.cc: vector_math::FMAC_NEON(… │
│ │
│ 159 { │
│ 160 SCOPED_TRACE("FMAC_NEON"); │
│ 161 FillTestVectors │
│ (kInputFillValue, │
│ kOutputFillValue); │
│ 162 - vector_math::FMAC_NEON │
│ (input_array_.data(), kScale, │
│ kVectorSize, │
│ 163 - │
│ output_array_.data()); │
│ 162 + vector_math::FMAC_NEON │
│ (input_array_, kScale, kVectorSize, │
│ 163 + │
│ output_array_); │
│ 164 VerifyOutput(kResult); │
│ 165 } │
│ 166 #endif │
╰──────────────────────────────────────────────────────────────────────────╯
✦ FMUL_NEON unittest.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math_unittest.cc: vector_math::FMUL_NEON(… │
│ │
│ 209 { │
│ 210 SCOPED_TRACE("FMUL_NEON"); │
│ 211 FillTestVectors │
│ (kInputFillValue, │
│ kOutputFillValue); │
│ 212 - vector_math::FMUL_NEON │
│ (input_array_.data(), kScale, │
│ kVectorSize, │
│ 213 - │
│ output_array_.data()); │
│ 212 + vector_math::FMUL_NEON │
│ (input_array_, kScale, kVectorSize, │
│ 213 + │
│ output_array_); │
│ 214 VerifyOutput(kResult); │
│ 215 } │
│ 216 #endif │
╰──────────────────────────────────────────────────────────────────────────╯
✦ FCLAMP_NEON unittest.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math_unittest.cc: vector_math::FCLAMP_NEO… │
│ │
│ 257 { │
│ 258 SCOPED_TRACE("FCLAMP_NEON"); │
│ 259 FillTestClampingVectors │
│ (kUnclampedInputValues, │
│ kOutputFillValue); │
│ 260 - vector_math::FCLAMP_NEON │
│ (input_array_.data(), kVectorSize, │
│ 261 - │
│ output_array_.data()); │
│ 260 + vector_math::FCLAMP_NEON │
│ (input_array_, kVectorSize, │
│ 261 + │
│ output_array_); │
│ 262 VerifyClampOutput │
│ (kClampedOutputValues); │
│ 263 } │
│ 264 #endif │
╰──────────────────────────────────────────────────────────────────────────╯
✦ EWMAAndMaxPower_NEON unittest.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math_unittest.cc: const std::pair<float… │
│ │
│ 417 { │
│ 418 SCOPED_TRACE │
│ ("EWMAAndMaxPower_NEON"); │
│ 419 const std::pair<float, float>& │
│ result = vector_math:: │
│ EWMAAndMaxPower_NEON( │
│ 420 - initial_value_, data_.data │
│ (), data_.size(), │
│ smoothing_factor_); │
│ 420 + initial_value_, data_, │
│ data_.size(), smoothing_factor_); │
│ 421 EXPECT_NEAR │
│ (expected_final_avg_, │
│ result.first, 0.0000001f); │
│ 422 EXPECT_NEAR(expected_max_, │
│ result.second, 0.0000001f); │
│ 423 } │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Okay, FCLAMP_remainder_data test. run_per_value_clamp_test now takes
spans, but the NEON call still passes a raw pointer. I need to fix that.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math_unittest.cc: const auto run_per_value_… │
│ │
│ 271 static constexpr int │
│ kSmallVectorSize = 1; │
│ 272 static constexpr float │
│ kGuardValue = 123.0f; │
│ 273 │
│ 274 - const auto │
│ run_per_value_clamp_test = │
│ 275 - [&](void (*fn)(base::span< │
│ const float>, int, base::span<float │
│ >)) { │
│ 274 + const auto │
│ run_per_value_clamp_test = [&](auto │
│ fn) { │
│ 275 for (auto [input, output] : │
│ 276 base::zip │
│ (kUnclampedInputValues, │
│ kClampedOutputValues)) { │
│ 277 input_array_[0] = input; │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Changes made. Building and running tests now.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Shell agents/extensions/landmines/agent_autoninja -C out/Default med… │
│ │
│ ... first 487 lines hidden ... │
│ ../../base/check.h:280:63: note: │
│ expanded from macro 'CHECK' │
│ 280 | │
│ logging::CheckError::Check(#cond, │
│ __VA_ARGS__), cond)) │
│ | │
│ ^~~~ │
│ ../../base/check.h:228:31: note: │
│ expanded from macro │
│ 'LOGGING_CHECK_FUNCTION_IMPL' │
│ 228 | if │
│ (ANALYZER_ASSUME_TRUE((condition) ? │
│ true : false)) \ │
│ | │
│ ^~~~~~~~~ │
│ ../../base/compiler_specific.h:523:36: │
│ note: expanded from macro │
│ 'ANALYZER_ASSUME_TRUE' │
│ 523 | #define │
│ ANALYZER_ASSUME_TRUE(arg) (arg) │
│ | │
│ ^~~ │
│ ../../base/macros/if.h:15:48: note: │
│ expanded from macro 'BASE_IF' │
│ 15 | │
│ BASE_CONCAT(BASE_INTERNAL_IF_, │
│ _Cond)(_Then, _Else) │
│ | │
│ ^~~~~ │
│ ../../base/macros/if.h:19:42: note: │
│ expanded from macro │
│ 'BASE_INTERNAL_IF_0' │
│ 19 | #define │
│ BASE_INTERNAL_IF_0(_Then, _Else) _Else │
│ | │
│ ^~~~~ │
│ ../../media/base/vector_math.cc:531:13: │
│ error: comparison of integers of │
│ different signs: 'int' and 'size_type' │
│ (aka 'unsigned long') │
│ [-Werror,-Wsign-compare] │
│ 531 | CHECK(len == src.size(), │
│ base::NotFatalUntil::M143); │
│ | ~~~ ^ ~~~~~~~~~~ │
│ ../../base/check.h:280:63: note: │
│ expanded from macro 'CHECK' │
│ 280 | │
│ logging::CheckError::Check(#cond, │
│ __VA_ARGS__), cond)) │
│ | │
│ ^~~~ │
│ ../../base/check.h:228:31: note: │
│ expanded from macro │
│ 'LOGGING_CHECK_FUNCTION_IMPL' │
│ 228 | if │
│ (ANALYZER_ASSUME_TRUE((condition) ? │
│ true : false)) \ │
│ | │
│ ^~~~~~~~~ │
│ ../../base/compiler_specific.h:523:36: │
│ note: expanded from macro │
│ 'ANALYZER_ASSUME_TRUE' │
│ 523 | #define │
│ ANALYZER_ASSUME_TRUE(arg) (arg) │
│ | │
│ ^~~ │
│ ../../base/macros/if.h:15:48: note: │
│ expanded from macro 'BASE_IF' │
│ 15 | │
│ BASE_CONCAT(BASE_INTERNAL_IF_, │
│ _Cond)(_Then, _Else) │
│ | │
│ ^~~~~ │
│ ../../base/macros/if.h:19:42: note: │
│ expanded from macro │
│ 'BASE_INTERNAL_IF_0' │
│ 19 | #define │
│ BASE_INTERNAL_IF_0(_Then, _Else) _Else │
│ | │
│ ^~~~~ │
│ 13 errors generated. │
│ │
│ │
│ 24.59s Build Failure: 1 done 1 failed │
│ 126 remaining - 0.04/s │
│ 1 steps failed: remote-exec │
│ 5955a1e287dd56da57cd5b9a5c6fb1e6e7050fd │
│ da65d5621c2d1a6d0ede3dd03/355 failed: │
│ exit=1 │
│ │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Build failed: -Wsign-compare from len vs src.size() and strict_cast in
subspan due to int vs size_t. I'll fix the CHECKs by casting len to size_t
and then fix subspan calls by casting i to size_t using base::checked_cast.
Starting with the CHECKs.
╭──────────────────────────────────────────────────────────────────────────╮
│ x Edit {"expected_replacements":12,"file_path":"/usr/local/google/home… │
│ │
│ Failed to edit, Expected 12 occurrences │
│ but found 16 for old_string in file: │
│ /usr/local/google/home/keishi/gemini-ru │
│ n/workdirs/chromium1/src/media/base/vec │
│ tor_math.cc │
╰──────────────────────────────────────────────────────────────────────────╯
✦ I miscounted. Re-reading the file to get the correct number of
replacements, then I'll try again.
╭────────────────────────────────────────╮
│ ✔ ReadFile media/base/vector_math.cc │
╰────────────────────────────────────────╯
✦ Okay, 12 instances of that specific CHECK exist. Retrying the replacement.
╭──────────────────────────────────────────────────────────────────────────╮
│ x Edit {"file_path":"/usr/local/google/home/keishi/gemini-run/workdirs… │
│ │
│ Failed to edit, Expected 12 occurrences │
│ but found 16 for old_string in file: │
│ /usr/local/google/home/keishi/gemini-ru │
│ n/workdirs/chromium1/src/media/base/vec │
│ tor_math.cc │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Okay, I'm losing it. Sixteen occurrences, not twelve. Retrying with
expected_replacements=16.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: CHECK(len == src.size(), base:... =>… │
│ │
│ ... first 186 lines hidden ... │
│ 458 // separate lanes of │
│ evaluation: │
│ 459 // │
│ ═══════════════════════════════════════ │
│ 528 float │
│ smoothing_factor) { │
│ 529 // TODO(crbug.com/431824301): │
│ Remove unneeded parameter once │
│ validated to be │
│ 530 // redundant in M143. │
│ 531 - CHECK(len == src.size(), │
│ base::NotFatalUntil::M143); │
│ 531 + CHECK(base │
│ ::checked_cast<size_t>(len) == src. │
│ size(), base::NotFatalUntil::M143); │
│ 532 const int rem = len % 8; │
│ 533 const int last_index = len - │
│ rem; │
│ 534 const float weight_prev = 1.0f │
│ - smoothing_factor; │
│ ═══════════════════════════════════════ │
│ 606 base::span<float │
│ > dest) { │
│ 607 // TODO(crbug.com/431824301): │
│ Remove unneeded parameter once │
│ validated to be │
│ 608 // redundant in M143. │
│ 609 - CHECK(len == src.size(), │
│ base::NotFatalUntil::M143); │
│ 609 + CHECK(base │
│ ::checked_cast<size_t>(len) == src. │
│ size(), base::NotFatalUntil::M143); │
│ 610 const int rem = len % 4; │
│ 611 const int last_index = len - │
│ rem; │
│ 612 float32x4_t m_scale = │
│ vmovq_n_f32(scale); │
│ ═══════════════════════════════════════ │
│ 628 base::span<float │
│ > dest) { │
│ 629 // TODO(crbug.com/431824301): │
│ Remove unneeded parameter once │
│ validated to be │
│ 630 // redundant in M143. │
│ 631 - CHECK(len == src.size(), │
│ base::NotFatalUntil::M143); │
│ 631 + CHECK(base │
│ ::checked_cast<size_t>(len) == src. │
│ size(), base::NotFatalUntil::M143); │
│ 632 const int rem = len % 4; │
│ 633 const int last_index = len - │
│ rem; │
│ 634 float32x4_t m_scale = │
│ vmovq_n_f32(scale); │
│ ═══════════════════════════════════════ │
│ 648 base::span< │
│ float> dest) { │
│ 649 // TODO(crbug.com/431824301): │
│ Remove unneeded parameter once │
│ validated to be │
│ 650 // redundant in M143. │
│ 651 - CHECK(len == src.size(), │
│ base::NotFatalUntil::M143); │
│ 651 + CHECK(base │
│ ::checked_cast<size_t>(len) == src. │
│ size(), base::NotFatalUntil::M143); │
│ 652 const int rem = len % 4; │
│ 653 const int last_index = len - │
│ rem; │
│ 654 const float32x4_t m_min = │
│ vmovq_n_f32(kClampMin); │
│ ═══════════════════════════════════════ │
│ 683 │
│ float │
│ smoothing_factor) { │
│ 684 // TODO(crbug.com/431824301): │
│ Remove unneeded parameter once │
│ validated to be │
│ 685 // redundant in M143. │
│ 686 - CHECK(len == src.size(), │
│ base::NotFatalUntil::M143); │
│ 686 + CHECK(base │
│ ::checked_cast<size_t>(len) == src. │
│ size(), base::NotFatalUntil::M143); │
│ 687 // When the recurrence is │
│ unrolled, we see that we can │
│ split it into 4 │
│ 688 // separate lanes of │
│ evaluation: │
│ 689 // │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Okay, subspan calls next. Casting i to size_t. Done.
╭──────────────────────────────────────────────────────────────────────────╮
│ x Edit {"expected_replacements":38,"old_string":"src.subspan(i).data()… │
│ │
│ Failed to edit, Expected 38 occurrences │
│ but found 22 for old_string in file: │
│ /usr/local/google/home/keishi/gemini-ru │
│ n/workdirs/chromium1/src/media/base/vec │
│ tor_math.cc │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Miscounted. Re-reading and counting.
╭────────────────────────────────────────╮
│ ✔ ReadFile media/base/vector_math.cc │
╰────────────────────────────────────────╯
✦ Okay, file read. 22 instances of src.subspan(i).data(). Retrying with
expected_replacements=22.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: src.subspan(i).data() => src.subspan… │
│ │
│ ... first 264 lines hidden ... │
│ _mm256_loadu_ps(src.subspan(i).data │
│ ()); │
│ 564 + aligned_src ? │
│ _mm256_load_ps(src.subspan(base │
│ ::checked_cast<size_t>(i)).data()) │
│ 565 + : │
│ _mm256_loadu_ps(src.subspan │
│ (base::checked_cast<size_t>(i)). │
│ data()); │
│ 566 __m256 sample_x2 = │
│ _mm256_mul_ps(sample, sample); │
│ 567 max = _mm256_max_ps(max, │
│ sample_x2); │
│ 568 res = │
│ _mm256_fmadd_ps(sample_x2, │
│ sum_coeff, _mm256_mul_ps(res, │
│ res_coeff)); │
│ ═══════════════════════════════════════ │
│ 613 for (int i = 0; i < last_index; i │
│ += 4) { │
│ 614 vst1q_f32(dest.subspan(i).data │
│ (), │
│ 615 vmlaq_f32(vld1q_f32 │
│ (dest.subspan(i).data()), │
│ 616 - vld1q_f32 │
│ (src.subspan(i).data()), m_scale)); │
│ 616 + vld1q_f32( │
│ src.subspan │
│ (base::checked_cast<size_t>(i)). │
│ data()), m_scale)); │
│ 617 } │
│ 618 │
│ 619 // Handle any remaining values │
│ that wouldn't fit in an NEON │
│ pass. │
│ ═══════════════════════════════════════ │
│ 634 float32x4_t m_scale = │
│ vmovq_n_f32(scale); │
│ 635 for (int i = 0; i < last_index; i │
│ += 4) { │
│ 636 vst1q_f32(dest.subspan(i).data │
│ (), │
│ 637 - vmulq_f32(vld1q_f32 │
│ (src.subspan(i).data()), m_scale)); │
│ 637 + vmulq_f32(vld1q_f32 │
│ (src.subspan(base │
│ ::checked_cast<size_t>(i)).data()), │
│ m_scale)); │
│ 638 } │
│ 639 │
│ 640 // Handle any remaining values │
│ that wouldn't fit in an NEON │
│ pass. │
│ ═══════════════════════════════════════ │
│ 654 const float32x4_t m_min = │
│ vmovq_n_f32(kClampMin); │
│ 655 const float32x4_t m_max = │
│ vmovq_n_f32(kClampMax); │
│ 656 for (int i = 0; i < last_index; i │
│ += 4) { │
│ 657 - const float32x4_t values = │
│ vld1q_f32(src.subspan(i).data()); │
│ 657 + const float32x4_t values = │
│ vld1q_f32(src.subspan(base:: │
│ checked_cast<size_t>(i)).data()); │
│ 658 │
│ 659 // Compare each value with │
│ itself. Since NaN != NaN, we end │
│ up with a mask │
│ 660 // with 0s instead of NaNs, and │
│ 1s for the original values. │
│ ═══════════════════════════════════════ │
│ 714 int i; │
│ 715 for (i = 0; i < last_index; i += │
│ 4) { │
│ 716 ewma_x4 = vmulq_f32(ewma_x4, │
│ weight_prev_4th_x4); │
│ 717 - const float32x4_t sample_x4 = │
│ vld1q_f32(src.subspan(i).data()); │
│ 717 + const float32x4_t sample_x4 = │
│ vld1q_f32(src.subspan(base:: │
│ checked_cast<size_t>(i)).data()); │
│ 718 const float32x4_t │
│ sample_squared_x4 = │
│ vmulq_f32(sample_x4, sample_x4); │
│ 719 max_x4 = vmaxq_f32(max_x4, │
│ sample_squared_x4); │
│ 720 ewma_x4 = vmlaq_f32(ewma_x4, │
│ sample_squared_x4, │
│ smoothing_factor_x4); │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Okay, 24 instances of dest.subspan(i).data() to update. Let's get to it.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math.cc: dest.subspan(i).data() => dest.subsp… │
│ │
│ ... first 228 lines hidden ... │
│ 409 │
│ m_max), │
│ 414 if (aligned_dest) { │
│ 415 for (int i = 0; i < │
│ last_index; i += 8) { │
│ 416 _mm256_store_ps( │
│ 417 - dest.subspan(i).data(), │
│ 417 + dest.subspan │
│ (base::checked_cast<size_t>(i)) │
│ .data(), │
│ 418 _mm256_max_ps( │
│ _mm256_min_ps(SanitizeNan( │
│ _mm256_loadu_ps( │
│ 419 │
│ src.subspan │
│ (base::checked_cast<size_t>(i)) │
│ .data())), │
│ 420 │
│ m_max), │
│ 423 } else { │
│ 424 for (int i = 0; i < │
│ last_index; i += 8) { │
│ 425 _mm256_storeu_ps( │
│ 426 - dest.subspan(i).data(), │
│ 426 + dest.subspan │
│ (base::checked_cast<size_t>(i)) │
│ .data(), │
│ 427 _mm256_max_ps( │
│ _mm256_min_ps(SanitizeNan( │
│ _mm256_loadu_ps( │
│ 428 │
│ src.subspan │
│ (base::checked_cast<size_t>(i)) │
│ .data())), │
│ 429 │
│ m_max), │
│ ═══════════════════════════════════════ │
│ 611 const int last_index = len - rem; │
│ 612 float32x4_t m_scale = │
│ vmovq_n_f32(scale); │
│ 613 for (int i = 0; i < last_index; i │
│ += 4) { │
│ 614 - vst1q_f32(dest.subspan(i).data │
│ (), │
│ 615 - vmlaq_f32(vld1q_f32 │
│ (dest.subspan(i).data()), │
│ 614 + vst1q_f32(dest.subspan(base │
│ ::checked_cast<size_t>(i)).data(), │
│ 615 + vmlaq_f32(vld1q_f32 │
│ (dest.subspan(base │
│ ::checked_cast<size_t>(i)).data()), │
│ 616 vld1q_f32( │
│ src.subspan │
│ (base::checked_cast<size_t>(i)). │
│ data()), m_scale)); │
│ 617 } │
│ 618 │
│ ═══════════════════════════════════════ │
│ 633 const int last_index = len - rem; │
│ 634 float32x4_t m_scale = │
│ vmovq_n_f32(scale); │
│ 635 for (int i = 0; i < last_index; i │
│ += 4) { │
│ 636 - vst1q_f32(dest.subspan(i).data │
│ (), │
│ 636 + vst1q_f32(dest.subspan(base │
│ ::checked_cast<size_t>(i)).data(), │
│ 637 vmulq_f32(vld1q_f32 │
│ (src.subspan(base │
│ ::checked_cast<size_t>(i)).data │
│ ()), m_scale)); │
│ 638 } │
│ 639 │
│ ═══════════════════════════════════════ │
│ 664 const float32x4_t │
│ sanitized_values = │
│ vreinterpretq_f32_u32( │
│ 665 vandq_u32 │
│ (vreinterpretq_u32_f32(values), │
│ comparisons)); │
│ 666 │
│ 667 - vst1q_f32(dest.subspan(i).data │
│ (), │
│ 667 + vst1q_f32(dest.subspan(base │
│ ::checked_cast<size_t>(i)).data(), │
│ 668 vminq_f32 │
│ (vmaxq_f32(sanitized_values, │
│ m_min), m_max)); │
│ 669 } │
│ 670 │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Okay, errors fixed. Building and running tests now.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Shell agents/extensions/landmines/agent_autoninja -C out/Default med… │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Build's done. Running tests.
╭──────────────────────────────────────────────────────────────╮
│ ✔ Shell out/Default/media_unittests (Run media_unittests.) │
│ │
│ ... first 24853 lines hidden ... │
│ media::vector_math::FCLAMP_C() │
│ #7 0x55d9ff45055b │
│ media::VectorMathTest_FCLAMP_remainder_ │
│ data_Test::TestBody()::$_0::operator()< │
│ >() │
│ #8 0x55d9ff450317 │
│ media::VectorMathTest_FCLAMP_remainder_ │
│ data_Test::TestBody() │
│ #9 0x55d9ffc9819b testing::Test::Run() │
│ #10 0x55d9ffc98f62 │
│ testing::TestInfo::Run() │
│ #11 0x55d9ffc99a87 │
│ testing::TestSuite::Run() │
│ #12 0x55d9ffca7477 │
│ testing::internal::UnitTestImpl::RunAll │
│ Tests() │
│ #13 0x55d9ffca6c5f │
│ testing::UnitTest::Run() │
│ #14 0x55da0111019a │
│ base::TestSuite::Run() │
│ #15 0x55d9ffde2141 │
│ base::OnceCallback<>::Run() │
│ #16 0x55da011dbb67 base::(anonymous │
│ namespace)::LaunchUnitTestsInternal() │
│ #17 0x55da011db8f9 │
│ base::LaunchUnitTests() │
│ #18 0x55d9ffa5e6ce main │
│ #19 0x7f2992267ca8 │
│ (/usr/lib/x86_64-linux-gnu/libc.so.6+0x │
│ 29ca7) │
│ #20 0x7f2992267d65 __libc_start_main │
│ #21 0x55d9ff1954ea _start │
│ │
│ [7688/7695] │
│ VectorMathTest.FCLAMP_remainder_data │
│ (CRASHED) │
│ [7689/7695] VectorMathTest.EmptyInputs │
│ (0 ms) │
│ [7690/7695] │
│ VideoAspectRatioTest.DefaultConstructio │
│ n (0 ms) │
│ [7691/7695] │
│ VideoAspectRatioTest.FromNaturalSize (0 │
│ ms) │
│ [7692/7695] VideoAspectRatioTest.Pixel │
│ (0 ms) │
│ [7693/7695] │
│ VideoAspectRatioTest.Display (0 ms) │
│ [7694/7695] │
│ VideoBitrateAllocationTest.Constructor_ │
│ DefaultsModeConstant (0 ms) │
│ [7695/7695] │
│ VideoBitrateAllocationTest.Constructor_ │
│ ConstantBitrate_CorrectMode (0 ms) │
│ 1 test crashed: │
│ │
│ VectorMathTest.FCLAMP_remainder_data │
│ (../../media/base/vector_math_unittest. │
│ cc:269) │
│ Tests took 41 seconds. │
│ │
│ [0817/205642.059455:ERROR:base/test/lau │
│ ncher/test_launcher.cc:1319] no test │
│ result for VectorMathTest.EmptyInputs │
│ [0817/205642.059517:ERROR:base/test/lau │
│ ncher/test_launcher.cc:1319] no test │
│ result for │
│ VideoAspectRatioTest.DefaultConstructio │
│ n │
│ [0817/205642.059527:ERROR:base/test/lau │
│ ncher/test_launcher.cc:1319] no test │
│ result for │
│ VideoAspectRatioTest.FromNaturalSize │
│ [0817/205642.059535:ERROR:base/test/lau │
│ ncher/test_launcher.cc:1319] no test │
│ result for VideoAspectRatioTest.Pixel │
│ [0817/205642.059543:ERROR:base/test/lau │
│ ncher/test_launcher.cc:1319] no test │
│ result for VideoAspectRatioTest.Display │
│ [0817/205642.059550:ERROR:base/test/lau │
│ ncher/test_launcher.cc:1319] no test │
│ result for │
│ VideoBitrateAllocationTest.Constructor_ │
│ DefaultsModeConstant │
│ [0817/205642.059563:ERROR:base/test/lau │
│ ncher/test_launcher.cc:1319] no test │
│ result for │
│ VideoBitrateAllocationTest.Constructor_ │
│ ConstantBitrate_CorrectMode │
│ │
╰──────────────────────────────────────────────────────────────╯
✦ VectorMathTest.FCLAMP_remainder_data crashed because FCLAMP_C's size check
failed. The test passes a full-sized input_array_ span while specifying a
size of 1. I'll fix this by passing a subspan of the correct size to the
function. I also need to revert my incorrect change to the test's lambda
signature and instead fix the call sites. Reverting the lambda first.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math_unittest.cc: const auto run_per_value_… │
│ │
│ 271 static constexpr int │
│ kSmallVectorSize = 1; │
│ 272 static constexpr float │
│ kGuardValue = 123.0f; │
│ 273 │
│ 274 - const auto │
│ run_per_value_clamp_test = [&](auto │
│ fn) { │
│ 274 + const auto │
│ run_per_value_clamp_test = │
│ 275 + [&](auto fn) { │
│ 276 for (auto [input, output] : │
│ 277 base::zip │
│ (kUnclampedInputValues, │
│ kClampedOutputValues)) { │
│ 278 input_array_[0] = input; │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Okay, fn's arguments are mismatched. input_array_ and output_array_ are
converting to spans of kVectorSize, but len is kSmallVectorSize, causing
the size check to fail. I'll fix this by passing
base::span(input_array_).first(kSmallVectorSize) and
base::span(output_array_).first(kSmallVectorSize) to fn. Applying the
change now.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math_unittest.cc: fn(input_array_, … │
│ │
│ 277 base::zip │
│ (kUnclampedInputValues, │
│ kClampedOutputValues)) { │
│ 278 input_array_[0] = input; │
│ 279 output_array_[0] = │
│ kGuardValue; │
│ 280 - fn(input_array_, │
│ kSmallVectorSize, output_array_); │
│ 280 + fn(base::span(input_array_). │
│ first(kSmallVectorSize), │
│ kSmallVectorSize, │
│ 281 + base::span(output_array_). │
│ first(kSmallVectorSize)); │
│ 282 EXPECT_EQ(output_array_[0], │
│ output); │
│ 283 } │
│ 284 }; │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Test fixed. Building, running.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Shell agents/extensions/landmines/agent_autoninja -C out/Default med… │
│ │
│ In file included from │
│ ../../media/base/vector_math_unittest.c │
│ c:6: │
│ In file included from │
│ ../../media/base/vector_math.h:10: │
│ In file included from │
│ ../../base/containers/span.h:33: │
│ ../../base/numerics/safe_conversions.h: │
│ 271:47: error: no matching function for │
│ call to 'strict_cast' │
│ 271 | constexpr StrictNumeric(Src │
│ value) : value_(strict_cast<T>(value)) │
│ {} │
│ | │
│ ^~~~~~~~~~~~~~ │
│ ../../media/base/vector_math_unittest.c │
│ c:280:45: note: in instantiation of │
│ function template specialization │
│ 'base::internal::StrictNumeric<unsigned │
│ long>::StrictNumeric<int>' requested │
│ here │
│ 280 | │
│ fn(base::span(input_array_).first(kSmal │
│ lVectorSize), kSmallVectorSize, │
│ | │
│ ^ │
│ ../../base/numerics/safe_conversions.h: │
│ 229:15: note: candidate template │
│ ignored: constraints not satisfied │
│ [with Dst = unsigned long, Src = int, │
│ SrcType = UnderlyingType<int>] │
│ 229 | constexpr Dst strict_cast(Src │
│ value) { │
│ | ^ │
│ ../../base/numerics/safe_conversions.h: │
│ 227:7: note: because │
│ 'kStaticDstRangeRelationToSrcRange<unsi │
│ gned long, int> == │
│ NumericRangeRepresentation::kContained' │
│ evaluated to false │
│ 227 | │
│ kStaticDstRangeRelationToSrcRange<Dst, │
│ SrcType> == │
│ | ^ │
│ 1 error generated. │
│ │
│ │
│ 33.68s Build Failure: 1 done 1 failed 2 │
│ remaining - 0.03/s │
│ cannot make progress due to previous 1 │
│ errors: remote-exec │
│ 0bc2a3f1cc348e8e13c81d306dc7359979451c4 │
│ 7f61e7f8f327eb077eb1ba230/355 failed: │
│ exit=1 │
│ │
╰──────────────────────────────────────────────────────────────────────────╯
✦ strict_cast failed. kSmallVectorSize is int, first() needs size_t. I'll
cast it.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Edit media/base/vector_math_unittest.cc: fn(base::span(inp… │
│ │
│ 277 base::zip │
│ (kUnclampedInputValues, │
│ kClampedOutputValues)) { │
│ 278 input_array_[0] = input; │
│ 279 output_array_[0] = │
│ kGuardValue; │
│ 280 - fn(base::span(input_array_). │
│ first(kSmallVectorSize), │
│ kSmallVectorSize, │
│ 281 - base::span(output_array_). │
│ first(kSmallVectorSize)); │
│ 280 + fn(base::span(input_array_). │
│ first( │
│ 281 + base::checked_cast< │
│ size_t>(kSmallVectorSize)), │
│ 282 + kSmallVectorSize, │
│ 283 + base::span(output_array_). │
│ first( │
│ 284 + base::checked_cast< │
│ size_t>(kSmallVectorSize))); │
│ 285 EXPECT_EQ(output_array_[0], │
│ output); │
│ 286 } │
│ 287 }; │
╰──────────────────────────────────────────────────────────────────────────╯
✦ Test fixed. Building, running.
╭──────────────────────────────────────────────────────────────────────────╮
│ ✔ Shell agents/extensions/landmines/agent_autoninja -C out/Default med… │
│ │
│ ... first 24692 lines hidden ... │
│ rofile0__PIXEL_FORMAT_NV12__ (393 ms) │
│ [7664/7687] │
│ VpxGeneric/SoftwareVideoEncoderTest.Enc │
│ odeAndDecodeWithEnablingDrop/vp9__vp9_p │
│ rofile0__PIXEL_FORMAT_XRGB__ (389 ms) │
│ [7665/7687] │
│ VpxGeneric/SoftwareVideoEncoderTest.Enc │
│ odeAndDecodeWithEnablingDrop/vp9__vp9_p │
│ rofile1__PIXEL_FORMAT_I444__ (513 ms) │
│ [7666/7687] │
│ VpxGeneric/SoftwareVideoEncoderTest.Enc │
│ odeAndDecodeWithEnablingDrop/vp9__vp9_p │
│ rofile1__PIXEL_FORMAT_NV12__ (511 ms) │
│ [7667/7687] │
│ VpxGeneric/SoftwareVideoEncoderTest.Enc │
│ odeAndDecodeWithEnablingDrop/vp9__vp9_p │
│ rofile1__PIXEL_FORMAT_XRGB__ (495 ms) │
│ [7668/7687] │
│ VpxGeneric/SoftwareVideoEncoderTest.Enc │
│ odeAndDecode/vp9__vp9_profile0__PIXEL_F │
│ ORMAT_I420__ (462 ms) │
│ [7669/7687] │
│ VpxGeneric/SoftwareVideoEncoderTest.Enc │
│ odeAndDecode/vp9__vp9_profile0__PIXEL_F │
│ ORMAT_NV12__ (487 ms) │
│ [7670/7687] │
│ VpxGeneric/SoftwareVideoEncoderTest.Enc │
│ odeAndDecode/vp9__vp9_profile0__PIXEL_F │
│ ORMAT_XRGB__ (424 ms) │
│ [7671/7687] │
│ VpxGeneric/SoftwareVideoEncoderTest.Enc │
│ odeAndDecode/vp9__vp9_profile1__PIXEL_F │
│ ORMAT_I444__ (545 ms) │
│ [7672/7687] │
│ VpxGeneric/SoftwareVideoEncoderTest.Enc │
│ odeAndDecode/vp9__vp9_profile1__PIXEL_F │
│ ORMAT_NV12__ (512 ms) │
│ [7673/7687] │
│ VpxGeneric/SoftwareVideoEncoderTest.Enc │
│ odeAndDecode/vp9__vp9_profile1__PIXEL_F │
│ ORMAT_XRGB__ (493 ms) │
│ [7674/7687] │
│ VpxGeneric/SoftwareVideoEncoderTest.Enc │
│ odeAndDecode/vp9__vp9_profile2__PIXEL_F │
│ ORMAT_I420__ (445 ms) │
│ [7675/7687] │
│ VpxGeneric/SoftwareVideoEncoderTest.Enc │
│ odeAndDecode/vp9__vp9_profile2__PIXEL_F │
│ ORMAT_NV12__ (457 ms) │
│ [7676/7687] │
│ VpxGeneric/SoftwareVideoEncoderTest.Enc │
│ odeAndDecode/vp9__vp9_profile2__PIXEL_F │
│ ORMAT_XRGB__ (447 ms) │
│ [7677/7687] │
│ VpxGeneric/SoftwareVideoEncoderTest.Enc │
│ odeAndDecode/vp9__vp9_profile3__PIXEL_F │
│ ORMAT_I444__ (673 ms) │
│ [7678/7687] │
│ PipelineIntegrationTest.BasicPlaybackOp │
│ usOgg_4ch_ChannelMapping2 (36 ms) │
│ [7679/7687] │
│ PipelineIntegrationTest.BasicPlaybackOp │
│ usOgg_11ch_ChannelMapping2 (50 ms) │
│ [7680/7687] │
│ PipelineIntegrationTest.BasicPlaybackHa │
│ shed (102 ms) │
│ [7681/7687] │
│ PipelineIntegrationTest.WaveLayoutChang │
│ e (7 ms) │
│ [7682/7687] │
│ PipelineIntegrationTest.PlaybackStereo4 │
│ 8000hz (13 ms) │
│ [7683/7687] │
│ PipelineIntegrationTest.PlaybackWithAud │
│ ioTrackDisabledThenEnabled (2906 ms) │
│ [7684/7687] │
│ PipelineIntegrationTest.PlaybackWithVid │
│ eoTrackDisabledThenEnabled (2914 ms) │
│ [7685/7687] │
│ PipelineIntegrationTest.TrackStatusChan │
│ gesBeforePipelineStarted (1 ms) │
│ [7686/7687] │
│ PipelineIntegrationTest.TrackStatusChan │
│ gesAfterPipelineEnded (78 ms) │
│ [7687/7687] │
│ PipelineIntegrationTest.TrackStatusChan │
│ gesWhileSuspended (2889 ms) │
│ SUCCESS: all tests passed. │
│ Tests took 41 seconds. │
│ │
╰──────────────────────────────────────────────────────────────────────────╯
✦ All tests passed. Unsafe buffer usage is fixed and redundant
parameters are marked. The patch is ready.
GEMINI_JOB_COMPLETE_GEMINI
⠧ Concluding Patch Preparation
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Using:
- 10 open files (ctrl+g to view)
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src (gemini-run/batch-run-1755462473/group_115*)
no sandbox (see /docs)
gemini-2.5-pro (65% context left)
--- BUILD FAILED ---
See out/run-1755462473/group_115-fixed.fail for details.