diff options
Diffstat (limited to 'absl/base/prefetch.h')
| -rw-r--r-- | absl/base/prefetch.h | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/absl/base/prefetch.h b/absl/base/prefetch.h index 4d428462..6bc98637 100644 --- a/absl/base/prefetch.h +++ b/absl/base/prefetch.h @@ -30,9 +30,11 @@ #include <xmmintrin.h> #endif -#if defined(_MSC_VER) && defined(ABSL_INTERNAL_HAVE_SSE) +#if defined(_MSC_VER) && _MSC_VER >= 1900 && \ + (defined(_M_X64) || defined(_M_IX86)) #include <intrin.h> #pragma intrinsic(_mm_prefetch) +#pragma intrinsic(_m_prefetchw) #endif namespace absl { @@ -174,10 +176,15 @@ inline void PrefetchToLocalCacheNta(const void* addr) { inline void PrefetchToLocalCacheForWrite(const void* addr) { #if defined(_MM_HINT_ET0) _mm_prefetch(reinterpret_cast<const char*>(addr), _MM_HINT_ET0); -#elif defined(__x86_64__) +#elif defined(_MSC_VER) && _MSC_VER >= 1900 && \ + (defined(_M_X64) || defined(_M_IX86)) + // MSVC 2015 and up on x86/x64 supports prefetchw (feature listed as 3DNOW) + _m_prefetchw(const_cast<void*>(addr)); +#elif !defined(_MSC_VER) && defined(__x86_64__) // _MM_HINT_ET0 is not universally supported. As we commented further // up, PREFETCHW is recognized as a no-op on older Intel processors - // and has been present on AMD processors since the K6-2 + // and has been present on AMD processors since the K6-2. We have this + // disabled for MSVC compilers as this miscompiles on older MSVC compilers. asm("prefetchw (%0)" : : "r"(addr)); #endif } |