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Make the fast-isel code for literal 0.0 a bit shorter/faster, since 0.0 is common. rdar://problem/9303592 .

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130338 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2011-04-27 22:41:55 +00:00
parent 161b887506
commit 2790ba8e5a
4 changed files with 64 additions and 2 deletions
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8
lib/CodeGen/SelectionDAG/FastISel.cpp
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@@ -164,8 +164,12 @@ unsigned FastISel::materializeRegForValue(const Value *V, MVT VT) {
Reg =
getRegForValue(Constant::getNullValue(TD.getIntPtrType(V->getContext())));
} else if (const ConstantFP *CF = dyn_cast<ConstantFP>(V)) {
// Try to emit the constant directly.
Reg = FastEmit_f(VT, VT, ISD::ConstantFP, CF);
if (CF->isZero()) {
Reg = TargetMaterializeFloatZero(CF);
} else {
// Try to emit the constant directly.
Reg = FastEmit_f(VT, VT, ISD::ConstantFP, CF);
}
if (!Reg) {
// Try to emit the constant by using an integer constant with a cast.