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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3613 91177308-0d34-0410-b5e6-96231b3b80d8
32 lines
809 B
LLVM
32 lines
809 B
LLVM
; Test that LICM uses basicaa to do alias analysis, which is capable of
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; disambiguating some obvious cases. The ToRemove load should be eliminated
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; in this testcase. This testcase was carefully contrived so that GCSE would
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; not be able to eliminate the load itself, without licm's help. This is
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; because, for GCSE, the load is killed by the dummy basic block.
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; RUN: if as < %s | opt -basicaa -licm -gcse -simplifycfg -instcombine | dis | grep ToRemove
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; RUN: then exit 1
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; RUN: else exit 0
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; RUN: fi
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%A = global int 7
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%B = global int 8
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implementation
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int %test(bool %c) {
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%ToRemove = load int* %A
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br label %Loop
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Loop:
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%Atmp = load int* %A
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store int %Atmp, int* %B ; Store cannot alias %A
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br bool %c, label %Out, label %Loop
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Out:
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ret int 7
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Dummy:
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store int 7, int* %A
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br label %Loop
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}
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