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Improve the X86 cost model for loads and stores.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170830 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2012-12-21 01:33:59 +00:00
parent c2a537bd08
commit f5637c3997
4 changed files with 95 additions and 2 deletions
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24
lib/Target/X86/X86ISelLowering.cpp
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@@ -17818,6 +17818,30 @@ X86VectorTargetTransformInfo::getArithmeticInstrCost(unsigned Opcode,
return VectorTargetTransformImpl::getArithmeticInstrCost(Opcode, Ty);
}
unsigned
X86VectorTargetTransformInfo::getMemoryOpCost(unsigned Opcode, Type *Src,
unsigned Alignment,
unsigned AddressSpace) const {
// Legalize the type.
std::pair<unsigned, MVT> LT = getTypeLegalizationCost(Src);
assert(Opcode == Instruction::Load || Opcode == Instruction::Store &&
"Invalid Opcode");
const X86Subtarget &ST =
TLI->getTargetMachine().getSubtarget<X86Subtarget>();
// Each load/store unit costs 1.
unsigned Cost = LT.first * 1;
// On Sandybridge 256bit load/stores are double pumped
// (but not on Haswell).
if (LT.second.getSizeInBits() > 128 && !ST.hasAVX2())
Cost*=2;
return Cost;
}
unsigned
X86VectorTargetTransformInfo::getVectorInstrCost(unsigned Opcode, Type *Val,
unsigned Index) const {