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The visitXOR method can return the same SDNode. If so, we don't want to delete

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it as it's not dead.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101855 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2010-04-20 01:25:01 +00:00
parent d7aba875c1
commit 86c5abb4c0
2 changed files with 59 additions and 1 deletions
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2
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -4911,7 +4911,7 @@ SDValue DAGCombiner::visitBRCOND(SDNode *N) {
if (Op0.getOpcode() == Op1.getOpcode()) {
// Avoid missing important xor optimizations.
SDValue Tmp = visitXOR(TheXor);
if (Tmp.getNode()) {
if (Tmp.getNode() && Tmp.getNode() != TheXor) {
DEBUG(dbgs() << "\nReplacing.8 ";
TheXor->dump(&DAG);
dbgs() << "\nWith: ";

58
test/CodeGen/X86/2010-04-19-DAGCombineCrash.ll Normal file
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@ -0,0 +1,58 @@
; RUN: llc < %s -mtriple=i386-apple-darwin
; rdar://7869290
%struct.anon = type { float }
define void @func() nounwind ssp {
entry:
br label %bb66
bb: ; preds = %bb66
br i1 undef, label %bb65, label %bb2
bb2: ; preds = %bb
br i1 undef, label %bb65, label %bb3
bb3: ; preds = %bb2
br i1 undef, label %bb65, label %bb4
bb4: ; preds = %bb3
br i1 undef, label %bb65, label %bb5
bb5: ; preds = %bb4
br i1 undef, label %bb65, label %bb6
bb6: ; preds = %bb5
br i1 undef, label %bb65, label %bb11
bb11: ; preds = %bb6
br i1 undef, label %bb65, label %bb12
bb12: ; preds = %bb11
br i1 undef, label %bb65, label %bb13
bb13: ; preds = %bb12
br i1 undef, label %bb65, label %bb14
bb14: ; preds = %bb13
%0 = trunc i16 undef to i1 ; <i1> [#uses=1]
%1 = load i8* undef, align 8 ; <i8> [#uses=1]
%2 = shl i8 %1, 4 ; <i8> [#uses=1]
%3 = lshr i8 %2, 7 ; <i8> [#uses=1]
%4 = trunc i8 %3 to i1 ; <i1> [#uses=1]
%5 = icmp ne i1 %0, %4 ; <i1> [#uses=1]
br i1 %5, label %bb65, label %bb15
bb15: ; preds = %bb14
%6 = load %struct.anon** undef, align 8 ; <%struct.anon*> [#uses=0]
br label %bb65
bb65: ; preds = %bb15, %bb14, %bb13, %bb12, %bb11, %bb6, %bb5, %bb4, %bb3, %bb2, %bb
br label %bb66
bb66: ; preds = %bb65, %entry
br i1 undef, label %bb, label %bb67
bb67: ; preds = %bb66
ret void
}