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1; RUN: opt < %s -iv-users -S -disable-output
2;
3; PR12868: Infinite recursion:
4; getUDivExpr()->getZeroExtendExpr()->isLoopBackedgeGuardedBy()
5;
6; We actually want SCEV simplification to fail gracefully in this
7; case, so there's no output to check, just the absence of stack overflow.
8
9@c = common global i8 0, align 1
10
11define i32 @func() {
12entry:
13  br label %for.cond
14
15for.cond:                                         ; preds = %for.body, %entry
16  %storemerge = phi i8 [ -1, %entry ], [ %inc, %for.body ]
17  %ui.0 = phi i32 [ undef, %entry ], [ %div, %for.body ]
18  %tobool = icmp eq i8 %storemerge, 0
19  br i1 %tobool, label %for.end, label %for.body
20
21for.body:                                         ; preds = %for.cond
22  %conv = sext i8 %storemerge to i32
23  %div = lshr i32 %conv, 1
24  %tobool2 = icmp eq i32 %div, 0
25  %inc = add i8 %storemerge, 1
26  br i1 %tobool2, label %for.cond, label %for.end
27
28for.end:                                          ; preds = %for.body, %for.cond
29  ret i32 0
30}
31