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comparison test/Feature/cfgstructures.ll @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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-1:000000000000 0:95c75e76d11b
1 ; RUN: llvm-as < %s | llvm-dis > %t1.ll
2 ; RUN: llvm-as %t1.ll -o - | llvm-dis > %t2.ll
3 ; RUN: diff %t1.ll %t2.ll
4
5 ;; This is an irreducible flow graph
6 define void @irreducible(i1 %cond) {
7 br i1 %cond, label %X, label %Y
8
9 X: ; preds = %Y, %0
10 br label %Y
11
12 Y: ; preds = %X, %0
13 br label %X
14 }
15
16 ;; This is a pair of loops that share the same header
17 define void @sharedheader(i1 %cond) {
18 br label %A
19
20 A: ; preds = %Y, %X, %0
21 br i1 %cond, label %X, label %Y
22
23 X: ; preds = %A
24 br label %A
25
26 Y: ; preds = %A
27 br label %A
28 }
29
30
31 ;; This is a simple nested loop
32 define void @nested(i1 %cond1, i1 %cond2, i1 %cond3) {
33 br label %Loop1
34
35 Loop1: ; preds = %L2Exit, %0
36 br label %Loop2
37
38 Loop2: ; preds = %L3Exit, %Loop1
39 br label %Loop3
40
41 Loop3: ; preds = %Loop3, %Loop2
42 br i1 %cond3, label %Loop3, label %L3Exit
43
44 L3Exit: ; preds = %Loop3
45 br i1 %cond2, label %Loop2, label %L2Exit
46
47 L2Exit: ; preds = %L3Exit
48 br i1 %cond1, label %Loop1, label %L1Exit
49
50 L1Exit: ; preds = %L2Exit
51 ret void
52 }
53