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| author | Ivan Maidanski <ivmai@mail.ru> | 2021-10-29 21:56:27 +0300 |
|---|---|---|
| committer | Ivan Maidanski <ivmai@mail.ru> | 2021-10-29 21:56:27 +0300 |
| commit | f2213c36d2d7d26f2f5466f45003d33f6d94ac62 (patch) | |
| tree | 5418041f3811e6345bea65db3348985d4a792aa5 | |
| parent | 15144d440bb5b1293d0ab7e7d8bda07570e4f480 (diff) | |
| download | libatomic_ops-f2213c36d2d7d26f2f5466f45003d33f6d94ac62.tar.gz | |
Always use 'mfence' for nop_full if target CPU supports SSE2 (MS VC/x86)
* src/atomic_ops/sysdeps/msftc/x86.h [!AO_USE_PENTIUM4_INSTRS
&& _M_IX86_FP>=2] (AO_USE_PENTIUM4_INSTRS): Define; add comment.
| -rw-r--r-- | src/atomic_ops/sysdeps/msftc/x86.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/atomic_ops/sysdeps/msftc/x86.h b/src/atomic_ops/sysdeps/msftc/x86.h index d18ac13..ba2400a 100644 --- a/src/atomic_ops/sysdeps/msftc/x86.h +++ b/src/atomic_ops/sysdeps/msftc/x86.h @@ -35,6 +35,11 @@ # define AO_ASSUME_WINDOWS98 #endif +#if !defined(AO_USE_PENTIUM4_INSTRS) && _M_IX86_FP >= 2 /* SSE2 */ + /* "mfence" is a part of SSE2 set (introduced on Intel Pentium 4). */ +# define AO_USE_PENTIUM4_INSTRS +#endif + #define AO_T_IS_INT #ifndef AO_USE_INTERLOCKED_INTRINSICS |