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https://github.com/c64scene-ar/llvm-6502.git
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e78760e179
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8558 91177308-0d34-0410-b5e6-96231b3b80d8
37 lines
783 B
LLVM
37 lines
783 B
LLVM
; Test that GCSE uses basicaa to do alias analysis, which is capable of
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; disambiguating some obvious cases. All loads should be removable in
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; this testcase.
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; RUN: llvm-as < %s | opt -basicaa -load-vn -gcse -instcombine -dce | llvm-dis | not grep load
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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() {
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%A1 = load int* %A
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store int 123, int* %B ; Store cannot alias %A
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%A2 = load int* %A
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%X = sub int %A1, %A2
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ret int %X
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}
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int %test2() {
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%A1 = load int* %A
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br label %Loop
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Loop:
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%AP = phi int [0, %0], [%X, %Loop]
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store int %AP, int* %B ; Store cannot alias %A
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%A2 = load int* %A
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%X = sub int %A1, %A2
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%c = seteq int %X, 0
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br bool %c, label %out, label %Loop
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out:
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ret int %X
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}
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