}
// fold (sub x, x) -> 0
- if (N0 == N1)
- return DAG.getConstant(0, N->getValueType(0), LegalTypes);
+ // FIXME: Refactor this and xor and other similar operations together.
+ if (N0 == N1) {
+ if (!VT.isVector()) {
+ return DAG.getConstant(0, VT);
+ } else if (!LegalOperations || TLI.isOperationLegal(ISD::BUILD_VECTOR, VT)){
+ // Produce a vector of zeros.
+ SDValue El = DAG.getConstant(0, VT.getVectorElementType());
+ std::vector<SDValue> Ops(VT.getVectorNumElements(), El);
+ return DAG.getNode(ISD::BUILD_VECTOR, N->getDebugLoc(), VT,
+ &Ops[0], Ops.size());
+ }
+ }
// fold (sub c1, c2) -> c1-c2
if (N0C && N1C)
return DAG.FoldConstantArithmetic(ISD::SUB, VT, N0C, N1C);
--- /dev/null
+; RUN: llc < %s -mtriple=i386-apple-darwin
+
+define fastcc void @foo(i32 %type) nounwind optsize {
+entry:
+ switch i32 %type, label %bb26 [
+ i32 33634, label %bb11
+ i32 5121, label %bb27
+ ]
+
+bb11: ; preds = %entry
+ br label %bb27
+
+bb26: ; preds = %entry
+ unreachable
+
+bb27: ; preds = %bb11, %entry
+ %srcpb.0 = phi i32 [ 1, %bb11 ], [ 0, %entry ]
+ br i1 undef, label %bb348, label %bb30.lr.ph
+
+bb30.lr.ph: ; preds = %bb27
+ %.sum743 = shl i32 %srcpb.0, 1
+ %0 = mul i32 %srcpb.0, -2
+ %.sum745 = add i32 %.sum743, %0
+ br i1 undef, label %bb70, label %bb71
+
+bb70: ; preds = %bb30.lr.ph
+ unreachable
+
+bb71: ; preds = %bb30.lr.ph
+ br i1 undef, label %bb92, label %bb80
+
+bb80: ; preds = %bb71
+ unreachable
+
+bb92: ; preds = %bb71
+ %1 = getelementptr inbounds i8* undef, i32 %.sum745
+ unreachable
+
+bb348: ; preds = %bb27
+ ret void
+}