diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/X86/X86TargetTransformInfo.cpp | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp index ba6462a0768..2952925ee41 100644 --- a/llvm/lib/Target/X86/X86TargetTransformInfo.cpp +++ b/llvm/lib/Target/X86/X86TargetTransformInfo.cpp @@ -273,9 +273,12 @@ int X86TTIImpl::getArithmeticInstrCost( if (ISD == ISD::SDIV && LT.second == MVT::v4i32 && ST->hasSSE41()) return LT.first * 15; - if (const auto *Entry = CostTableLookup(SSE2UniformConstCostTable, ISD, - LT.second)) - return LT.first * Entry->Cost; + // XOP has faster vXi8 shifts. + if ((ISD != ISD::SHL && ISD != ISD::SRL && ISD != ISD::SRA) || + !ST->hasXOP()) + if (const auto *Entry = + CostTableLookup(SSE2UniformConstCostTable, ISD, LT.second)) + return LT.first * Entry->Cost; } static const CostTblEntry AVX2UniformCostTable[] = { |
