diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86.td')
| -rw-r--r-- | llvm/lib/Target/X86/X86.td | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86.td b/llvm/lib/Target/X86/X86.td index 8fcc8e31d5d..99d6c6932ae 100644 --- a/llvm/lib/Target/X86/X86.td +++ b/llvm/lib/Target/X86/X86.td @@ -273,6 +273,13 @@ def FeatureFastSHLDRotate "fast-shld-rotate", "HasFastSHLDRotate", "true", "SHLD can be used as a faster rotate">; +// String operations (e.g. REP MOVS) are fast. See "REP String Enhancement" in +// the Intel Software Development Manual. +def FeatureFastString + : SubtargetFeature< + "fast-string", "HasFastString", "true", + "REP MOVS/STOS are fast">; + //===----------------------------------------------------------------------===// // X86 processors supported. //===----------------------------------------------------------------------===// @@ -498,6 +505,7 @@ def HSWFeatures : ProcessorFeatures<IVBFeatures.Value, [ FeatureAVX2, FeatureBMI, FeatureBMI2, + FeatureFastString, FeatureFMA, FeatureLZCNT, FeatureMOVBE, |
