Add support for fast isel of inttoptr and ptrtoint in the cases where truncation is not needed.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55399 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index 59bc8c5..64843f8 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -388,6 +388,25 @@
if (!SelectConstantCast(I, ISD::SINT_TO_FP, ValueMap)) return I;
break;
+ case Instruction::IntToPtr: // Deliberate fall-through.
+ case Instruction::PtrToInt: {
+ MVT SrcVT = TLI.getValueType(I->getOperand(0)->getType());
+ MVT DstVT = TLI.getValueType(I->getType());
+ if (SrcVT.getSimpleVT() == DstVT.getSimpleVT()) {
+ ValueMap[I] = ValueMap[I->getOperand(0)];
+ break;
+ } else if (DstVT.bitsGT(SrcVT)) {
+ if (!isa<ConstantInt>(I->getOperand(0))) {
+ if (!SelectCast(I, ISD::ZERO_EXTEND, ValueMap)) return I;
+ } else
+ if (!SelectConstantCast(I, ISD::ZERO_EXTEND, ValueMap)) return I;
+ break;
+ } else {
+ // TODO: Handle SrcVT > DstVT, where truncation is needed.
+ return I;
+ }
+ }
+
default:
// Unhandled instruction. Halt "fast" selection and bail.
return I;