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annotate test/Transforms/LoopSimplify/2003-12-10-ExitBlocksProblem.ll @ 95:afa8332a0e37 LLVM3.8

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LLVM 3.8
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 13 Oct 2015 17:48:58 +0900
parents 95c75e76d11b
children
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1 ; LoopSimplify is breaking LICM on this testcase because the exit blocks from
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2 ; the loop are reachable from more than just the exit nodes: the exit blocks
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3 ; have predecessors from outside of the loop!
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4 ;
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5 ; This is distilled from a monsterous crafty example.
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7 ; RUN: opt < %s -licm -disable-output
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10 @G = weak global i32 0 ; <i32*> [#uses=7]
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12 define i32 @main() {
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13 entry:
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14 store i32 123, i32* @G
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15 br label %loopentry.i
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16 loopentry.i: ; preds = %endif.1.i, %entry
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17 %tmp.0.i = load i32, i32* @G ; <i32> [#uses=1]
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18 %tmp.1.i = icmp eq i32 %tmp.0.i, 123 ; <i1> [#uses=1]
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19 br i1 %tmp.1.i, label %Out.i, label %endif.0.i
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20 endif.0.i: ; preds = %loopentry.i
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21 %tmp.3.i = load i32, i32* @G ; <i32> [#uses=1]
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22 %tmp.4.i = icmp eq i32 %tmp.3.i, 126 ; <i1> [#uses=1]
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23 br i1 %tmp.4.i, label %ExitBlock.i, label %endif.1.i
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24 endif.1.i: ; preds = %endif.0.i
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25 %tmp.6.i = load i32, i32* @G ; <i32> [#uses=1]
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26 %inc.i = add i32 %tmp.6.i, 1 ; <i32> [#uses=1]
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27 store i32 %inc.i, i32* @G
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28 br label %loopentry.i
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29 Out.i: ; preds = %loopentry.i
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30 store i32 0, i32* @G
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31 br label %ExitBlock.i
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32 ExitBlock.i: ; preds = %Out.i, %endif.0.i
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33 %tmp.7.i = load i32, i32* @G ; <i32> [#uses=1]
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34 ret i32 %tmp.7.i
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35 }
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