forked from OSchip/llvm-project
fix PR9523, a crash in looprotate on a non-canonical loop made out of indirectbr.
llvm-svn: 129203
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@ -184,7 +184,11 @@ bool LoopRotate::rotateLoop(Loop *L) {
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// Now, this loop is suitable for rotation.
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BasicBlock *OrigPreheader = L->getLoopPreheader();
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BasicBlock *OrigLatch = L->getLoopLatch();
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assert(OrigPreheader && OrigLatch && "Loop not in canonical form?");
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// If the loop could not be converted to canonical form, it must have an
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// indirectbr in it, just give up.
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if (OrigPreheader == 0 || OrigLatch == 0)
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return false;
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// Anything ScalarEvolution may know about this loop or the PHI nodes
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// in its header will soon be invalidated.
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@ -137,3 +137,19 @@ bb17: ; preds = %bb15
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}
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; PR9523 - Non-canonical loop.
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define void @test7(i8* %P) nounwind {
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entry:
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indirectbr i8* %P, [label %"3", label %"5"]
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"3": ; preds = %"4", %entry
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br i1 undef, label %"5", label %"4"
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"4": ; preds = %"3"
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br label %"3"
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"5": ; preds = %"3", %entry
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ret void
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}
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