diff options
Diffstat (limited to 'absl/base/config.h')
| -rw-r--r-- | absl/base/config.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/absl/base/config.h b/absl/base/config.h index 3f5ace3f..a0d599fe 100644 --- a/absl/base/config.h +++ b/absl/base/config.h @@ -837,6 +837,21 @@ static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' || #define ABSL_INTERNAL_HAS_RTTI 1 #endif // !defined(__GNUC__) || defined(__GXX_RTTI) +// ABSL_INTERNAL_HAVE_SSE is used for compile-time detection of SSE support. +// See https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html for an overview of +// which architectures support the various x86 instruction sets. +#ifdef ABSL_INTERNAL_HAVE_SSE +#error ABSL_INTERNAL_HAVE_SSE cannot be directly set +#elif defined(__SSE__) +#define ABSL_INTERNAL_HAVE_SSE 1 +#elif defined(_M_X64) || (defined(_M_IX86_FP) && _M_IX86_FP >= 1) +// MSVC only defines _M_IX86_FP for x86 32-bit code, and _M_IX86_FP >= 1 +// indicates that at least SSE was targeted with the /arch:SSE option. +// All x86-64 processors support SSE, so support can be assumed. +// https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros +#define ABSL_INTERNAL_HAVE_SSE 1 +#endif + // ABSL_INTERNAL_HAVE_SSE2 is used for compile-time detection of SSE2 support. // See https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html for an overview of // which architectures support the various x86 instruction sets. |