PR3686: make the legalizer handle bitcast from i80 to x86 long double.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66021 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 8 insertions, 0 deletions

diff --git a/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp b/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
index 661391be4d..3cc8f966aa 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
@@ -667,6 +667,7 @@ bool DAGTypeLegalizer::PromoteIntegerOperand(SDNode *N, unsigned OpNo) {
     abort();
 
   case ISD::ANY_EXTEND:   Res = PromoteIntOp_ANY_EXTEND(N); break;
+  case ISD::BIT_CONVERT:  Res = PromoteIntOp_BIT_CONVERT(N); break;
   case ISD::BR_CC:        Res = PromoteIntOp_BR_CC(N, OpNo); break;
   case ISD::BRCOND:       Res = PromoteIntOp_BRCOND(N, OpNo); break;
   case ISD::BUILD_PAIR:   Res = PromoteIntOp_BUILD_PAIR(N); break;
@@ -745,6 +746,12 @@ SDValue DAGTypeLegalizer::PromoteIntOp_ANY_EXTEND(SDNode *N) {
   return DAG.getNode(ISD::ANY_EXTEND, N->getDebugLoc(), N->getValueType(0), Op);
 }
 
+SDValue DAGTypeLegalizer::PromoteIntOp_BIT_CONVERT(SDNode *N) {
+  // This should only occur in unusual situations like bitcasting to an
+  // x86_fp80, so just turn it into a store+load
+  return CreateStackStoreLoad(N->getOperand(0), N->getValueType(0));
+}
+
 SDValue DAGTypeLegalizer::PromoteIntOp_BR_CC(SDNode *N, unsigned OpNo) {
   assert(OpNo == 2 && "Don't know how to promote this operand!");
 
diff --git a/lib/CodeGen/SelectionDAG/LegalizeTypes.h b/lib/CodeGen/SelectionDAG/LegalizeTypes.h
index 4228f560bd..b50e127bef 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeTypes.h
+++ b/lib/CodeGen/SelectionDAG/LegalizeTypes.h
@@ -285,6 +285,7 @@ private:
   // Integer Operand Promotion.
   bool PromoteIntegerOperand(SDNode *N, unsigned OperandNo);
   SDValue PromoteIntOp_ANY_EXTEND(SDNode *N);
+  SDValue PromoteIntOp_BIT_CONVERT(SDNode *N);
   SDValue PromoteIntOp_BUILD_PAIR(SDNode *N);
   SDValue PromoteIntOp_BR_CC(SDNode *N, unsigned OpNo);
   SDValue PromoteIntOp_BRCOND(SDNode *N, unsigned OpNo);