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-rw-r--r--llvm/lib/Target/X86/X86TargetTransformInfo.cpp9
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[] = {
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