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86 lines
2.5 KiB
LLVM
86 lines
2.5 KiB
LLVM
; This testcase tests for various features the basicaa test should be able to
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; determine, as noted in the comments.
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; RUN: llvm-upgrade < %s | llvm-as | opt -basicaa -load-vn -gcse -instcombine -dce | llvm-dis | not grep REMOVE
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%Global = external global { int }
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implementation
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; Array test: Test that operations on one local array do not invalidate
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; operations on another array. Important for scientific codes.
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;
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int %different_array_test(long %A, long %B) {
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%Array1 = alloca int, uint 100
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%Array2 = alloca int, uint 200
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%pointer = getelementptr int* %Array1, long %A
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%val = load int* %pointer
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%pointer2 = getelementptr int* %Array2, long %B
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store int 7, int* %pointer2
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%REMOVE = load int* %pointer ; redundant with above load
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%retval = sub int %REMOVE, %val
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ret int %retval
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}
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; Constant index test: Constant indexes into the same array should not
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; interfere with each other. Again, important for scientific codes.
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;
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int %constant_array_index_test() {
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%Array = alloca int, uint 100
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%P1 = getelementptr int* %Array, long 7
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%P2 = getelementptr int* %Array, long 6
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%A = load int* %P1
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store int 1, int* %P2 ; Should not invalidate load
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%BREMOVE = load int* %P1
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%Val = sub int %A, %BREMOVE
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ret int %Val
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}
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; Test that if two pointers are spaced out by a constant getelementptr, that
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; they cannot alias.
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int %gep_distance_test(int* %A) {
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%REMOVEu = load int* %A
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%B = getelementptr int* %A, long 2 ; Cannot alias A
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store int 7, int* %B
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%REMOVEv = load int* %A
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%r = sub int %REMOVEu, %REMOVEv
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ret int %r
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}
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; Test that if two pointers are spaced out by a constant offset, that they
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; cannot alias, even if there is a variable offset between them...
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int %gep_distance_test2({int,int}* %A, long %distance) {
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%A = getelementptr {int,int}* %A, long 0, uint 0
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%REMOVEu = load int* %A
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%B = getelementptr {int,int}* %A, long %distance, uint 1
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store int 7, int* %B ; B cannot alias A, it's at least 4 bytes away
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%REMOVEv = load int* %A
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%r = sub int %REMOVEu, %REMOVEv
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ret int %r
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}
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; Test that we can do funny pointer things and that distance calc will still
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; work.
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int %gep_distance_test3(int * %A) {
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%X = load int* %A
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%B = cast int* %A to sbyte*
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%C = getelementptr sbyte* %B, long 4
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%Y = load sbyte* %C
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ret int 8
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}
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; Test that we can disambiguate globals reached through constantexpr geps
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int %constexpr_test() {
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%X = alloca int
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%Y = load int* %X
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store int 5, int* getelementptr ({ int }* %Global, long 0, uint 0)
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%REMOVE = load int* %X
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%retval = sub int %Y, %REMOVE
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ret int %retval
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}
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