forked from OSchip/llvm-project
54 lines
1.8 KiB
C++
54 lines
1.8 KiB
C++
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//===-- scudo_crc32.cpp -----------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// CRC32 function leveraging hardware specific instructions. This has to be
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/// kept separated to restrict the use of compiler specific flags to this file.
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///
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//===----------------------------------------------------------------------===//
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// Hardware CRC32 is supported at compilation via the following:
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// - for i386 & x86_64: -msse4.2
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// - for ARM & AArch64: -march=armv8-a+crc or -mcrc
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// An additional check must be performed at runtime as well to make sure the
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// emitted instructions are valid on the target host.
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#include "scudo_crc32.h"
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#include "scudo_utils.h"
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#if defined(__SSE4_2__) || defined(__ARM_FEATURE_CRC32)
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# ifdef __SSE4_2__
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# include <smmintrin.h>
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# define CRC32_INTRINSIC FIRST_32_SECOND_64(_mm_crc32_u32, _mm_crc32_u64)
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# endif
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# ifdef __ARM_FEATURE_CRC32
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# include <arm_acle.h>
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# define CRC32_INTRINSIC FIRST_32_SECOND_64(__crc32cw, __crc32cd)
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# endif
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#endif // defined(__SSE4_2__) || defined(__ARM_FEATURE_CRC32)
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namespace __scudo {
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#if defined(__SSE4_2__) || defined(__ARM_FEATURE_CRC32)
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INLINE u32 computeHardwareCRC32(u32 Crc, uptr Data) {
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return CRC32_INTRINSIC(Crc, Data);
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}
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u32 computeCRC32(u32 Crc, uptr Data, u8 HashType) {
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if (HashType == CRC32Hardware) {
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return computeHardwareCRC32(Crc, Data);
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}
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return computeSoftwareCRC32(Crc, Data);
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}
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#else
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u32 computeCRC32(u32 Crc, uptr Data, u8 HashType) {
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return computeSoftwareCRC32(Crc, Data);
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}
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#endif // defined(__SSE4_2__) || defined(__ARM_FEATURE_CRC32)
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} // namespace __scudo
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