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Fix PR3353, infinitely jump threading an infinite loop make from switches.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62529 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -419,6 +419,11 @@ bool JumpThreading::ProcessBranchOnDuplicateCond(BasicBlock *PredBB,
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/// switches out of repeated 'if' conditions.
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bool JumpThreading::ProcessSwitchOnDuplicateCond(BasicBlock *PredBB,
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BasicBlock *DestBB) {
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// Can't thread edge to self.
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if (PredBB == DestBB)
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return false;
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SwitchInst *PredSI = cast<SwitchInst>(PredBB->getTerminator());
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SwitchInst *DestSI = cast<SwitchInst>(DestBB->getTerminator());
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21
test/Transforms/JumpThreading/2009-01-19-InfSwitchLoop.ll
Normal file
21
test/Transforms/JumpThreading/2009-01-19-InfSwitchLoop.ll
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@ -0,0 +1,21 @@
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; RUN: llvm-as < %s | opt -jump-threading | llvm-dis
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; PR3353
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define i32 @test(i8 %X) {
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entry:
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%Y = add i8 %X, 1
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%Z = add i8 %Y, 1
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br label %bb33.i
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bb33.i: ; preds = %bb33.i, %bb32.i
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switch i8 %Y, label %bb32.i [
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i8 39, label %bb35.split.i
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i8 13, label %bb33.i
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]
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bb35.split.i:
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ret i32 5
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bb32.i:
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ret i32 1
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}
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