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Fix PR3353, infinitely jump threading an infinite loop make from switches.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62529 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-01-19 21:20:34 +00:00
parent 1f54f58e64
commit 2c7ed11d93
2 changed files with 26 additions and 0 deletions
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5
lib/Transforms/Scalar/JumpThreading.cpp
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@ -419,6 +419,11 @@ bool JumpThreading::ProcessBranchOnDuplicateCond(BasicBlock *PredBB,
/// switches out of repeated 'if' conditions.
bool JumpThreading::ProcessSwitchOnDuplicateCond(BasicBlock *PredBB,
BasicBlock *DestBB) {
// Can't thread edge to self.
if (PredBB == DestBB)
return false;
SwitchInst *PredSI = cast<SwitchInst>(PredBB->getTerminator());
SwitchInst *DestSI = cast<SwitchInst>(DestBB->getTerminator());

21
test/Transforms/JumpThreading/2009-01-19-InfSwitchLoop.ll Normal file
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@ -0,0 +1,21 @@
; RUN: llvm-as < %s | opt -jump-threading | llvm-dis
; PR3353
define i32 @test(i8 %X) {
entry:
%Y = add i8 %X, 1
%Z = add i8 %Y, 1
br label %bb33.i
bb33.i: ; preds = %bb33.i, %bb32.i
switch i8 %Y, label %bb32.i [
i8 39, label %bb35.split.i
i8 13, label %bb33.i
]
bb35.split.i:
ret i32 5
bb32.i:
ret i32 1
}