CodeGen: Default overflow operations to expand so we don't have to assume targets are lying

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>
Reviewed-by: ab
Differential Revision: http://reviews.llvm.org/D9265

llvm-svn: 236119

2 files changed, 8 insertions, 6 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 14a691b75f0..9157bf32b2c 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -1245,12 +1245,6 @@ void SelectionDAGLegalize::LegalizeOp(SDNode *Node) {
     break;
   case ISD::EXTRACT_ELEMENT:
   case ISD::FLT_ROUNDS_:
-  case ISD::SADDO:
-  case ISD::SSUBO:
-  case ISD::UADDO:
-  case ISD::USUBO:
-  case ISD::SMULO:
-  case ISD::UMULO:
   case ISD::FPOWI:
   case ISD::MERGE_VALUES:
   case ISD::EH_RETURN:
diff --git a/llvm/lib/CodeGen/TargetLoweringBase.cpp b/llvm/lib/CodeGen/TargetLoweringBase.cpp
index 8eb64643f13..4dd279ede0d 100644
--- a/llvm/lib/CodeGen/TargetLoweringBase.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringBase.cpp
@@ -804,6 +804,14 @@ void TargetLoweringBase::initActions() {
     setOperationAction(ISD::FMAXNUM, VT, Expand);
     setOperationAction(ISD::FMAD, VT, Expand);
 
+    // Overflow operations default to expand
+    setOperationAction(ISD::SADDO, VT, Expand);
+    setOperationAction(ISD::SSUBO, VT, Expand);
+    setOperationAction(ISD::UADDO, VT, Expand);
+    setOperationAction(ISD::USUBO, VT, Expand);
+    setOperationAction(ISD::SMULO, VT, Expand);
+    setOperationAction(ISD::UMULO, VT, Expand);
+
     // These library functions default to expand.
     setOperationAction(ISD::FROUND, VT, Expand);