| //===-- scudo_crc32.cpp -----------------------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| /// |
| /// CRC32 function leveraging hardware specific instructions. This has to be |
| /// kept separated to restrict the use of compiler specific flags to this file. |
| /// |
| //===----------------------------------------------------------------------===// |
| |
| #include "sanitizer_common/sanitizer_internal_defs.h" |
| |
| // Hardware CRC32 is supported at compilation via the following: |
| // - for i386 & x86_64: -msse4.2 |
| // - for ARM & AArch64: -march=armv8-a+crc or -mcrc |
| // An additional check must be performed at runtime as well to make sure the |
| // emitted instructions are valid on the target host. |
| |
| #if defined(__SSE4_2__) || defined(__ARM_FEATURE_CRC32) |
| # ifdef __SSE4_2__ |
| # include <smmintrin.h> |
| # define CRC32_INTRINSIC FIRST_32_SECOND_64(_mm_crc32_u32, _mm_crc32_u64) |
| # endif |
| # ifdef __ARM_FEATURE_CRC32 |
| # include <arm_acle.h> |
| # define CRC32_INTRINSIC FIRST_32_SECOND_64(__crc32cw, __crc32cd) |
| # endif |
| #endif // defined(__SSE4_2__) || defined(__ARM_FEATURE_CRC32) |
| |
| namespace __scudo { |
| |
| #if defined(__SSE4_2__) || defined(__ARM_FEATURE_CRC32) |
| u32 computeHardwareCRC32(u32 Crc, uptr Data) { |
| return CRC32_INTRINSIC(Crc, Data); |
| } |
| #endif // defined(__SSE4_2__) || defined(__ARM_FEATURE_CRC32) |
| |
| } // namespace __scudo |
