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The visitXOR method can return the same SDNode. If so, we don't want to delete
it as it's not dead. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101855 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -4911,7 +4911,7 @@ SDValue DAGCombiner::visitBRCOND(SDNode *N) {
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if (Op0.getOpcode() == Op1.getOpcode()) {
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// Avoid missing important xor optimizations.
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SDValue Tmp = visitXOR(TheXor);
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if (Tmp.getNode()) {
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if (Tmp.getNode() && Tmp.getNode() != TheXor) {
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DEBUG(dbgs() << "\nReplacing.8 ";
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TheXor->dump(&DAG);
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dbgs() << "\nWith: ";
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58
test/CodeGen/X86/2010-04-19-DAGCombineCrash.ll
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58
test/CodeGen/X86/2010-04-19-DAGCombineCrash.ll
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@ -0,0 +1,58 @@
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; RUN: llc < %s -mtriple=i386-apple-darwin
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; rdar://7869290
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%struct.anon = type { float }
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define void @func() nounwind ssp {
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entry:
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br label %bb66
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bb: ; preds = %bb66
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br i1 undef, label %bb65, label %bb2
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bb2: ; preds = %bb
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br i1 undef, label %bb65, label %bb3
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bb3: ; preds = %bb2
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br i1 undef, label %bb65, label %bb4
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bb4: ; preds = %bb3
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br i1 undef, label %bb65, label %bb5
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bb5: ; preds = %bb4
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br i1 undef, label %bb65, label %bb6
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bb6: ; preds = %bb5
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br i1 undef, label %bb65, label %bb11
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bb11: ; preds = %bb6
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br i1 undef, label %bb65, label %bb12
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bb12: ; preds = %bb11
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br i1 undef, label %bb65, label %bb13
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bb13: ; preds = %bb12
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br i1 undef, label %bb65, label %bb14
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bb14: ; preds = %bb13
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%0 = trunc i16 undef to i1 ; <i1> [#uses=1]
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%1 = load i8* undef, align 8 ; <i8> [#uses=1]
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%2 = shl i8 %1, 4 ; <i8> [#uses=1]
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%3 = lshr i8 %2, 7 ; <i8> [#uses=1]
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%4 = trunc i8 %3 to i1 ; <i1> [#uses=1]
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%5 = icmp ne i1 %0, %4 ; <i1> [#uses=1]
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br i1 %5, label %bb65, label %bb15
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bb15: ; preds = %bb14
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%6 = load %struct.anon** undef, align 8 ; <%struct.anon*> [#uses=0]
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br label %bb65
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bb65: ; preds = %bb15, %bb14, %bb13, %bb12, %bb11, %bb6, %bb5, %bb4, %bb3, %bb2, %bb
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br label %bb66
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bb66: ; preds = %bb65, %entry
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br i1 undef, label %bb, label %bb67
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bb67: ; preds = %bb66
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ret void
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}
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