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fix PR5698

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90708 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-12-06 17:17:23 +00:00
parent 9000242cca
commit 08bc2701a2
2 changed files with 27 additions and 0 deletions
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5
lib/Transforms/Scalar/JumpThreading.cpp
View File

@ -718,6 +718,11 @@ bool JumpThreading::ProcessSwitchOnDuplicateCond(BasicBlock *PredBB,
if (PredSI->getSuccessor(PredCase) != DestBB && if (PredSI->getSuccessor(PredCase) != DestBB &&
DestSI->getSuccessor(i) != DestBB) DestSI->getSuccessor(i) != DestBB)
continue; continue;
// Do not forward this if it already goes to this destination, this would
// be an infinite loop.
if (PredSI->getSuccessor(PredCase) == DestSucc)
continue;
// Otherwise, we're safe to make the change. Make sure that the edge from // Otherwise, we're safe to make the change. Make sure that the edge from
// DestSI to DestSucc is not critical and has no PHI nodes. // DestSI to DestSucc is not critical and has no PHI nodes.

22
test/Transforms/JumpThreading/crash.ll
View File

@ -212,3 +212,25 @@ bb13:
bb61: bb61:
ret void ret void
} }
; PR5698
define void @test7(i32 %x) {
tailrecurse:
switch i32 %x, label %return [
i32 2, label %bb2
i32 3, label %bb
]
bb:
switch i32 %x, label %return [
i32 2, label %bb2
i32 3, label %tailrecurse
]
bb2:
ret void
return:
ret void
}