load f64 +0.0 in a cleaner way. This fix part of PR5445
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93876 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Mips/MipsISelDAGToDAG.cpp b/lib/Target/Mips/MipsISelDAGToDAG.cpp
index a53e918..4cd6498 100644
--- a/lib/Target/Mips/MipsISelDAGToDAG.cpp
+++ b/lib/Target/Mips/MipsISelDAGToDAG.cpp
@@ -461,9 +461,18 @@
case ISD::ConstantFP: {
ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(Node);
if (Node->getValueType(0) == MVT::f64 && CN->isExactlyValue(+0.0)) {
- SDValue Zero = CurDAG->getRegister(Mips::ZERO, MVT::i32);
- ReplaceUses(SDValue(Node, 0), Zero);
- return Zero.getNode();
+ SDValue Zero = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), dl,
+ Mips::ZERO, MVT::i32);
+ SDValue Undef = SDValue(
+ CurDAG->getMachineNode(
+ TargetInstrInfo::IMPLICIT_DEF, dl, MVT::f64), 0);
+ SDNode *MTC = CurDAG->getMachineNode(Mips::MTC1, dl, MVT::f32, Zero);
+ SDValue I0 = CurDAG->getTargetInsertSubreg(Mips::SUBREG_FPEVEN, dl,
+ MVT::f64, Undef, SDValue(MTC, 0));
+ SDValue I1 = CurDAG->getTargetInsertSubreg(Mips::SUBREG_FPODD, dl,
+ MVT::f64, I0, SDValue(MTC, 0));
+ ReplaceUses(SDValue(Node, 0), I1);
+ return I1.getNode();
}
break;
}