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

diff --git a/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp b/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
index 661391be4ddd094e72f656d6babd0b81167aa1b4..3cc8f966aae5a723edf18829d6690c26c9a9e1fa 100644 (file)
--- 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 4228f560bdd220e1eb824f1fe2f8866e6bf0b69f..b50e127bef206509567f9c409d49ca1440e30eb3 100644 (file)
--- 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);

diff --git a/test/CodeGen/X86/2009-03-03-BitcastLongDouble.ll b/test/CodeGen/X86/2009-03-03-BitcastLongDouble.ll
new file mode 100644 (file)
index 0000000..2b493e6
--- /dev/null
+++ b/test/CodeGen/X86/2009-03-03-BitcastLongDouble.ll
@@ -0,0 +1,12 @@
+; RUN: llvm-as < %s | llc -march=x86
+; PR3686
+define i32 @x(i32 %y) nounwind readnone {
+entry:
+       %tmp14 = zext i32 %y to i80             ; <i80> [#uses=1]
+       %tmp15 = bitcast i80 %tmp14 to x86_fp80         ; <x86_fp80> [#uses=1]
+       %add = add x86_fp80 %tmp15, 0xK3FFF8000000000000000             ; <x86_fp80> [#uses=1]
+       %tmp11 = bitcast x86_fp80 %add to i80           ; <i80> [#uses=1]
+       %tmp10 = trunc i80 %tmp11 to i32                ; <i32> [#uses=1]
+       ret i32 %tmp10
+}
+