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Improve the SSE2 macro check on Windows. 

This lands https://github.com/google/snappy/pull/37
This commit is contained in:
alkis 2017-06-02 10:21:49 -07:00 committed by Victor Costan
parent 7dadceea52
commit 7b9532b878
1 changed files with 11 additions and 2 deletions
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snappy.cc
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@ -30,7 +30,16 @@
#include "snappy-internal.h" #include "snappy-internal.h"
#include "snappy-sinksource.h" #include "snappy-sinksource.h"
#ifdef __SSE2__ #ifndef SNAPPY_HAVE_SSE2
#if defined(__SSE2__) || defined(_M_X64) || \
(defined(_M_IX86_FP) && _M_IX86_FP >= 2)
#define SNAPPY_HAVE_SSE2 1
#else
#define SNAPPY_HAVE_SSE2 0
#endif
#endif
#if SNAPPY_HAVE_SSE2
#include <emmintrin.h> #include <emmintrin.h>
#endif #endif
#include <stdio.h> #include <stdio.h>
@ -96,7 +105,7 @@ void UnalignedCopy64(const void* src, void* dst) {
void UnalignedCopy128(const void* src, void* dst) { void UnalignedCopy128(const void* src, void* dst) {
// TODO(alkis): Remove this when we upgrade to a recent compiler that emits // TODO(alkis): Remove this when we upgrade to a recent compiler that emits
// SSE2 moves for memcpy(dst, src, 16). // SSE2 moves for memcpy(dst, src, 16).
#ifdef __SSE2__ #if SNAPPY_HAVE_SSE2
__m128i x = _mm_loadu_si128(static_cast<const __m128i*>(src)); __m128i x = _mm_loadu_si128(static_cast<const __m128i*>(src));
_mm_storeu_si128(static_cast<__m128i*>(dst), x); _mm_storeu_si128(static_cast<__m128i*>(dst), x);
#else #else