Make the fast-isel code for literal 0.0 a bit shorter/faster, since 0.0 is common. rdar://problem/9303592 .
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130338 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index 72c67d5..211c76b 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -164,8 +164,12 @@
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.