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Implement InstCombine/GEPIdxCanon.ll

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15024 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2004-07-20 01:48:15 +00:00
parent 247d62c77b
commit 67769e5efa
1 changed files with 10 additions and 1 deletions
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11
lib/Transforms/Scalar/InstructionCombining.cpp
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@@ -2700,7 +2700,8 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
Value *Op = GEP.getOperand(i); Value *Op = GEP.getOperand(i);
if (Op->getType()->getPrimitiveSize() > TD->getPointerSize()) if (Op->getType()->getPrimitiveSize() > TD->getPointerSize())
if (Constant *C = dyn_cast<Constant>(Op)) { if (Constant *C = dyn_cast<Constant>(Op)) {
GEP.setOperand(i, ConstantExpr::getCast(C, TD->getIntPtrType())); GEP.setOperand(i, ConstantExpr::getCast(C,
TD->getIntPtrType()->getSignedVersion()));
MadeChange = true; MadeChange = true;
} else { } else {
Op = InsertNewInstBefore(new CastInst(Op, TD->getIntPtrType(), Op = InsertNewInstBefore(new CastInst(Op, TD->getIntPtrType(),
@@ -2708,6 +2709,14 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
GEP.setOperand(i, Op); GEP.setOperand(i, Op);
MadeChange = true; MadeChange = true;
} }
// If this is a constant idx, make sure to canonicalize it to be a signed
// operand, otherwise CSE and other optimizations are pessimized.
if (ConstantUInt *CUI = dyn_cast<ConstantUInt>(Op)) {
GEP.setOperand(i, ConstantExpr::getCast(CUI,
CUI->getType()->getSignedVersion()));
MadeChange = true;
}
} }
if (MadeChange) return &GEP; if (MadeChange) return &GEP;