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[LoopVectorize] Up the maximum unroll factor to 4 for AArch64
Only for Cortex-A57 and Cyclone for now, where it has shown wins. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216141 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -104,7 +104,7 @@ public:
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return 64;
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}
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unsigned getMaximumUnrollFactor() const override { return 2; }
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unsigned getMaximumUnrollFactor() const override;
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unsigned getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src) const
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override;
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@ -513,3 +513,9 @@ unsigned AArch64TTI::getCostOfKeepingLiveOverCall(ArrayRef<Type*> Tys) const {
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}
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return Cost;
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}
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unsigned AArch64TTI::getMaximumUnrollFactor() const {
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if (ST->isCortexA57() || ST->isCyclone())
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return 4;
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return 2;
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}
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