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43 lines
1.2 KiB
LLVM
43 lines
1.2 KiB
LLVM
; LoopSimplify is breaking LICM on this testcase because the exit blocks from
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; the loop are reachable from more than just the exit nodes: the exit blocks
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; have predecessors from outside of the loop!
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;
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; This is distilled from a monsterous crafty example.
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; RUN: llvm-upgrade < %s | llvm-as | opt -licm -disable-output
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%G = weak global int 0 ; <int*> [#uses=13]
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implementation ; Functions:
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int %main() {
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entry:
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store int 123, int* %G
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br label %loopentry.i
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loopentry.i: ; preds = %entry, %endif.1.i
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%tmp.0.i = load int* %G ; <int> [#uses=1]
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%tmp.1.i = seteq int %tmp.0.i, 123 ; <bool> [#uses=1]
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br bool %tmp.1.i, label %Out.i, label %endif.0.i
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endif.0.i: ; preds = %loopentry.i
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%tmp.3.i = load int* %G ; <int> [#uses=1]
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%tmp.4.i = seteq int %tmp.3.i, 126 ; <bool> [#uses=1]
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br bool %tmp.4.i, label %ExitBlock.i, label %endif.1.i
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endif.1.i: ; preds = %endif.0.i
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%tmp.6.i = load int* %G ; <int> [#uses=1]
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%inc.i = add int %tmp.6.i, 1 ; <int> [#uses=1]
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store int %inc.i, int* %G
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br label %loopentry.i
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Out.i: ; preds = %loopentry.i
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store int 0, int* %G
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br label %ExitBlock.i
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ExitBlock.i: ; preds = %endif.0.i, %Out.i
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%tmp.7.i = load int* %G ; <int> [#uses=1]
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ret int %tmp.7.i
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}
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