Avoid emitting redundant materializations of integer constants
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
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index 17b37a3..f9cfeb1 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -81,7 +81,9 @@
} 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 @@
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);
}