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comparison test/Transforms/LoopSimplify/2003-12-10-ExitBlocksProblem.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
parents
children afa8332a0e37
comparison
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-1:000000000000 0:95c75e76d11b
1 ; LoopSimplify is breaking LICM on this testcase because the exit blocks from
2 ; the loop are reachable from more than just the exit nodes: the exit blocks
3 ; have predecessors from outside of the loop!
4 ;
5 ; This is distilled from a monsterous crafty example.
6
7 ; RUN: opt < %s -licm -disable-output
8
9
10 @G = weak global i32 0 ; <i32*> [#uses=7]
11
12 define i32 @main() {
13 entry:
14 store i32 123, i32* @G
15 br label %loopentry.i
16 loopentry.i: ; preds = %endif.1.i, %entry
17 %tmp.0.i = load i32* @G ; <i32> [#uses=1]
18 %tmp.1.i = icmp eq i32 %tmp.0.i, 123 ; <i1> [#uses=1]
19 br i1 %tmp.1.i, label %Out.i, label %endif.0.i
20 endif.0.i: ; preds = %loopentry.i
21 %tmp.3.i = load i32* @G ; <i32> [#uses=1]
22 %tmp.4.i = icmp eq i32 %tmp.3.i, 126 ; <i1> [#uses=1]
23 br i1 %tmp.4.i, label %ExitBlock.i, label %endif.1.i
24 endif.1.i: ; preds = %endif.0.i
25 %tmp.6.i = load i32* @G ; <i32> [#uses=1]
26 %inc.i = add i32 %tmp.6.i, 1 ; <i32> [#uses=1]
27 store i32 %inc.i, i32* @G
28 br label %loopentry.i
29 Out.i: ; preds = %loopentry.i
30 store i32 0, i32* @G
31 br label %ExitBlock.i
32 ExitBlock.i: ; preds = %Out.i, %endif.0.i
33 %tmp.7.i = load i32* @G ; <i32> [#uses=1]
34 ret i32 %tmp.7.i
35 }
36