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[InlineCost, NFC] Change CallAnalyzer::isGEPFree to use TTI::getUserCost instead of TTI::getGEPCost

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Currently CallAnalyzer::isGEPFree uses TTI::getGEPCost to check if GEP is free.
TTI::getGEPCost cannot handle cases when GEPs participate in Def-Use dependencies
(see https://reviews.llvm.org/D31186 for example).
There is TTI::getUserCost which can calculate the cost more accurately by
taking dependencies into account.

Differential Revision: https://reviews.llvm.org/D33685

llvm-svn: 309268
This commit is contained in:
Evgeny Astigeevich 2017-07-27 12:49:27 +00:00
parent 31b5f4eab5
commit 93630b8683
1 changed files with 5 additions and 6 deletions
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11
lib/Analysis/InlineCost.cpp
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@ -348,15 +348,14 @@ bool CallAnalyzer::accumulateGEPOffset(GEPOperator &GEP, APInt &Offset) {
///
/// Respects any simplified values known during the analysis of this callsite.
bool CallAnalyzer::isGEPFree(GetElementPtrInst &GEP) {
SmallVector<Value *, 4> Indices;
SmallVector<Value *, 4> Operands;
Operands.push_back(GEP.getOperand(0));
for (User::op_iterator I = GEP.idx_begin(), E = GEP.idx_end(); I != E; ++I)
if (Constant *SimpleOp = SimplifiedValues.lookup(*I))
Indices.push_back(SimpleOp);
Operands.push_back(SimpleOp);
else
Indices.push_back(*I);
return TargetTransformInfo::TCC_Free ==
TTI.getGEPCost(GEP.getSourceElementType(), GEP.getPointerOperand(),
Indices);
Operands.push_back(*I);
return TargetTransformInfo::TCC_Free == TTI.getUserCost(&GEP, Operands);
}
bool CallAnalyzer::visitAlloca(AllocaInst &I) {