Avoid FGETSIGN of 80-bit types. Fixes PR10085.

llvm-svn: 132681

1 files changed, 8 insertions, 6 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index 403d0d9fb22..cf6069a2f18 100644
--- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -1760,18 +1760,20 @@ bool TargetLowering::SimplifyDemandedBits(SDValue Op,
     break;
   }
   case ISD::BITCAST:
-    // If this is an FP->Int bitcast and if the sign bit is the only thing that
-    // is demanded, turn this into a FGETSIGN.
+    // If this is an FP->Int bitcast and if the sign bit is the only
+    // thing demanded, turn this into a FGETSIGN.
     if (NewMask == APInt::getSignBit(Op.getValueType().getSizeInBits()) &&
         Op.getOperand(0).getValueType().isFloatingPoint() &&
         !Op.getOperand(0).getValueType().isVector()) {
-      if (isOperationLegalOrCustom(ISD::FGETSIGN, MVT::i32)) {
-        EVT Ty = (isOperationLegalOrCustom(ISD::FGETSIGN, Op.getValueType())) ?
-          Op.getValueType() : MVT::i32;
+      bool OpVTLegal = isOperationLegalOrCustom(ISD::FGETSIGN, Op.getValueType());
+      bool i32Legal  = isOperationLegalOrCustom(ISD::FGETSIGN, MVT::i32);
+      if ((OpVTLegal || i32Legal) && Op.getValueType().isSimple()) {
+        EVT Ty = OpVTLegal ? Op.getValueType() : MVT::i32;
         // Make a FGETSIGN + SHL to move the sign bit into the appropriate
         // place.  We expect the SHL to be eliminated by other optimizations.
         SDValue Sign = TLO.DAG.getNode(ISD::FGETSIGN, dl, Ty, Op.getOperand(0));
-        if (Ty != Op.getValueType())
+        unsigned OpVTSizeInBits = Op.getValueType().getSizeInBits();
+        if (!OpVTLegal && OpVTSizeInBits > 32)
           Sign = TLO.DAG.getNode(ISD::ZERO_EXTEND, dl, Op.getValueType(), Sign);
         unsigned ShVal = Op.getValueType().getSizeInBits()-1;
         SDValue ShAmt = TLO.DAG.getConstant(ShVal, Op.getValueType());