derek.holloway
7502bf64a4
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31 lines
1014 B
LLVM
31 lines
1014 B
LLVM
; RUN: opt < %s -passes='require<iv-users>' -S -disable-output
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;
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; PR12868: Infinite recursion:
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; getUDivExpr()->getZeroExtendExpr()->isLoopBackedgeGuardedBy()
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;
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; We actually want SCEV simplification to fail gracefully in this
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; case, so there's no output to check, just the absence of stack overflow.
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@c = common global i8 0, align 1
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define i32 @func() {
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entry:
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br label %for.cond
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for.cond: ; preds = %for.body, %entry
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%storemerge = phi i8 [ -1, %entry ], [ %inc, %for.body ]
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%ui.0 = phi i32 [ undef, %entry ], [ %div, %for.body ]
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%tobool = icmp eq i8 %storemerge, 0
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br i1 %tobool, label %for.end, label %for.body
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for.body: ; preds = %for.cond
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%conv = sext i8 %storemerge to i32
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%div = lshr i32 %conv, 1
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%tobool2 = icmp eq i32 %div, 0
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%inc = add i8 %storemerge, 1
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br i1 %tobool2, label %for.cond, label %for.end
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for.end: ; preds = %for.body, %for.cond
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ret i32 0
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}
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