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Implement Regression/Transforms/InstCombine/getelementptr_cast.ll, which

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occurs many times in crafty


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18273 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-11-27 17:55:46 +00:00
parent ef1ef8272b
commit 646641e02c
1 changed files with 15 additions and 0 deletions
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15
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -3783,6 +3783,21 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
GEP.setOperand(0, X);
return &GEP;
}
} else if (GEP.getNumOperands() == 2) {
// Transform things like:
// %t = getelementptr ubyte* cast ([2 x sbyte]* %str to ubyte*), uint %V
// into: %t1 = getelementptr [2 x sbyte*]* %str, int 0, uint %V; cast
Constant *X = CE->getOperand(0);
const Type *SrcElTy = cast<PointerType>(X->getType())->getElementType();
const Type *ResElTy =cast<PointerType>(CE->getType())->getElementType();
if (isa<ArrayType>(SrcElTy) &&
TD->getTypeSize(cast<ArrayType>(SrcElTy)->getElementType()) ==
TD->getTypeSize(ResElTy)) {
Value *V = InsertNewInstBefore(
new GetElementPtrInst(X, Constant::getNullValue(Type::IntTy),
GEP.getOperand(1), GEP.getName()), GEP);
return new CastInst(V, GEP.getType());
}
}
}
}