blob: b4d44187f5e9b66ac650617d84a3207402d4c5b7 [file] [log] [blame]
Dan Gohman3c7d3082009-09-11 18:01:28 +00001; RUN: opt < %s -jump-threading -loop-rotate -instcombine -indvars -loop-unroll -simplifycfg -S > %t
Chris Lattner5b1d7822009-05-04 02:28:08 +00002; RUN: grep {volatile store} %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 volatile store i32 1000, i32* @v1, align 4
21 br label %bb3
22
23bb2: ; preds = %bb
24 volatile store 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}