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 661391b..3cc8f96 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
@@ -667,6 +667,7 @@
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 @@
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 4228f56..b50e127 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeTypes.h
+++ b/lib/CodeGen/SelectionDAG/LegalizeTypes.h
@@ -285,6 +285,7 @@
// 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
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
+}
+