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https://github.com/c64scene-ar/llvm-6502.git
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14285c89e7
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8544 91177308-0d34-0410-b5e6-96231b3b80d8
67 lines
1.5 KiB
LLVM
67 lines
1.5 KiB
LLVM
; Test that GCSE uses ds-aa to do alias analysis, which is capable of
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; disambiguating some cases.
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; RUN: llvm-as < %s | opt -no-aa -ds-aa -load-vn -gcse -instcombine -dce | llvm-dis | not grep ELIM
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%intpair = type {int*, int*}
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implementation
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%intpair *%alloc_pair() {
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%Ap = malloc int
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%Bp = malloc int
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%C = malloc {int*, int*}
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%C1p = getelementptr {int*, int*}* %C, long 0, ubyte 0
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store int* %Ap, int** %C1p
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%C2p = getelementptr {int*, int*}* %C, long 0, ubyte 1
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store int* %Bp, int** %C2p
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ret %intpair* %C
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}
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int* %getp(%intpair* %P) {
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%pp = getelementptr %intpair* %P, long 0, ubyte 0
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%V = load int** %pp
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ret int *%V
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}
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int* %getq(%intpair* %P) {
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%pp = getelementptr %intpair* %P, long 0, ubyte 1
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%V = load int** %pp
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ret int *%V
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}
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int %test() {
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%C = call %intpair* %alloc_pair()
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%A = call int* %getp(%intpair* %C)
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%B = call int* %getp(%intpair* %C)
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%A1 = load int* %A
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store int 123, int* %B ; Store does 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() { ; Test context sensitivity
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%C1 = call %intpair* %alloc_pair()
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%C2 = call %intpair* %alloc_pair()
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%P1 = call int* %getp(%intpair* %C1)
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%P2 = call int* %getp(%intpair* %C2)
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%X = load int* %P1
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store int 7, int* %P2
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%Y = load int* %P1
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%ELIM_x = sub int %X, %Y
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ret int %ELIM_x
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}
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int %test3() {
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%C = call %intpair* %alloc_pair()
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%P1 = call int* %getp(%intpair* %C)
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%P2 = call int* %getq(%intpair* %C)
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%X = load int* %P1
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store int 7, int* %P2
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%Y = load int* %P1
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%ELIM_x = sub int %X, %Y ; Check field sensitivity
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ret int %ELIM_x
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}
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