1; RUN: opt < %s -jump-threading -loop-rotate -instcombine -indvars -loop-unroll -simplifycfg -S -verify-dom-info -verify-loop-info > %t
2; RUN: grep "store volatile" %t | count 3
3; RUN: not grep "br label" %t
4
5; Jump threading should not prevent this loop from being unrolled.
6
7target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
8target triple = "i386-apple-darwin9.6"
9@v1 = external global i32		; <i32*> [#uses=2]
10
11define i32 @unroll() nounwind {
12entry:
13	br label %bb4
14
15bb:		; preds = %bb4
16	%0 = icmp eq i32 %i.0, 0		; <i1> [#uses=1]
17	br i1 %0, label %bb1, label %bb2
18
19bb1:		; preds = %bb
20	store volatile i32 1000, i32* @v1, align 4
21	br label %bb3
22
23bb2:		; preds = %bb
24	store volatile i32 1001, i32* @v1, align 4
25	br label %bb3
26
27bb3:		; preds = %bb2, %bb1
28	%1 = add i32 %i.0, 1		; <i32> [#uses=1]
29	br label %bb4
30
31bb4:		; preds = %bb3, %entry
32	%i.0 = phi i32 [ 0, %entry ], [ %1, %bb3 ]		; <i32> [#uses=3]
33	%2 = icmp sgt i32 %i.0, 2		; <i1> [#uses=1]
34	br i1 %2, label %bb5, label %bb
35
36bb5:		; preds = %bb4
37	ret i32 0
38}
39