1; RUN: opt < %s -iv-users -S -disable-output
2; RUN: opt < %s -passes='require<ivusers>' -S -disable-output
3;
4; PR12868: Infinite recursion:
5; getUDivExpr()->getZeroExtendExpr()->isLoopBackedgeGuardedBy()
6;
7; We actually want SCEV simplification to fail gracefully in this
8; case, so there's no output to check, just the absence of stack overflow.
9
10@c = common global i8 0, align 1
11
12define i32 @func() {
13entry:
14  br label %for.cond
15
16for.cond:                                         ; preds = %for.body, %entry
17  %storemerge = phi i8 [ -1, %entry ], [ %inc, %for.body ]
18  %ui.0 = phi i32 [ undef, %entry ], [ %div, %for.body ]
19  %tobool = icmp eq i8 %storemerge, 0
20  br i1 %tobool, label %for.end, label %for.body
21
22for.body:                                         ; preds = %for.cond
23  %conv = sext i8 %storemerge to i32
24  %div = lshr i32 %conv, 1
25  %tobool2 = icmp eq i32 %div, 0
26  %inc = add i8 %storemerge, 1
27  br i1 %tobool2, label %for.cond, label %for.end
28
29for.end:                                          ; preds = %for.body, %for.cond
30  ret i32 0
31}
32