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Disable ubsan for benign unaligned access in crc_memcpy

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PiperOrigin-RevId: 615160537
Change-Id: I29070c898104c55e6563eed0eef7397441bef1d7
This commit is contained in:
Abseil Team
2024-03-12 13:50:27 -07:00
committed by Copybara-Service
parent 686aae12d4
commit 3c1f9be71e
1 changed files with 8 additions and 3 deletions
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11
absl/crc/internal/crc_memcpy_x86_arm_combined.cc
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@@ -52,6 +52,7 @@
#include <cstring>
#include <memory>
#include "absl/base/attributes.h"
#include "absl/base/config.h"
#include "absl/base/optimization.h"
#include "absl/base/prefetch.h"
@@ -88,9 +89,11 @@ inline crc32c_t ShortCrcCopy(char* dst, const char* src, std::size_t length,
constexpr size_t kIntLoadsPerVec = sizeof(V128) / sizeof(uint64_t);
// Common function for copying the tails of multiple large regions.
// Disable ubsan for benign unaligned access. See b/254108538.
template <size_t vec_regions, size_t int_regions>
inline void LargeTailCopy(crc32c_t* crcs, char** dst, const char** src,
size_t region_size, size_t copy_rounds) {
ABSL_ATTRIBUTE_NO_SANITIZE_UNDEFINED inline void LargeTailCopy(
crc32c_t* crcs, char** dst, const char** src, size_t region_size,
size_t copy_rounds) {
std::array<V128, vec_regions> data;
std::array<uint64_t, kIntLoadsPerVec * int_regions> int_data;
@@ -155,8 +158,10 @@ class AcceleratedCrcMemcpyEngine : public CrcMemcpyEngine {
std::size_t length, crc32c_t initial_crc) const override;
};
// Disable ubsan for benign unaligned access. See b/254108538.
template <size_t vec_regions, size_t int_regions>
crc32c_t AcceleratedCrcMemcpyEngine<vec_regions, int_regions>::Compute(
ABSL_ATTRIBUTE_NO_SANITIZE_UNDEFINED crc32c_t
AcceleratedCrcMemcpyEngine<vec_regions, int_regions>::Compute(
void* __restrict dst, const void* __restrict src, std::size_t length,
crc32c_t initial_crc) const {
constexpr std::size_t kRegions = vec_regions + int_regions;