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Avoid emitting redundant materializations of integer constants

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for things like null pointers, which at this level aren't
different from regular integer constants.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57265 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2008-10-07 22:03:27 +00:00
parent 145b828014
commit 1e9e8c3bd5
1 changed files with 4 additions and 3 deletions
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7
lib/CodeGen/SelectionDAG/FastISel.cpp
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@ -81,7 +81,9 @@ unsigned FastISel::getRegForValue(Value *V) {
} else if (isa<AllocaInst>(V)) {
Reg = TargetMaterializeAlloca(cast<AllocaInst>(V));
} else if (isa<ConstantPointerNull>(V)) {
Reg = FastEmit_i(VT, VT, ISD::Constant, 0);
// Translate this as an integer zero so that it can be
// local-CSE'd with actual integer zeros.
Reg = getRegForValue(Constant::getNullValue(TD.getIntPtrType()));
} else if (ConstantFP *CF = dyn_cast<ConstantFP>(V)) {
Reg = FastEmit_f(VT, VT, ISD::ConstantFP, CF);
@ -95,8 +97,7 @@ unsigned FastISel::getRegForValue(Value *V) {
APFloat::rmTowardZero) != APFloat::opOK) {
APInt IntVal(IntBitWidth, 2, x);
unsigned IntegerReg = FastEmit_i(IntVT.getSimpleVT(), IntVT.getSimpleVT(),
ISD::Constant, IntVal.getZExtValue());
unsigned IntegerReg = getRegForValue(ConstantInt::get(IntVal));
if (IntegerReg != 0)
Reg = FastEmit_r(IntVT.getSimpleVT(), VT, ISD::SINT_TO_FP, IntegerReg);
}