llvm/test/Analysis/BasicAA/gcsetest.ll
2003-06-28 23:23:34 +00:00

37 lines
773 B
LLVM

; Test that GCSE uses basicaa to do alias analysis, which is capable of
; disambiguating some obvious cases. All loads should be removable in
; this testcase.
; RUN: as < %s | opt -basicaa -load-vn -gcse -instcombine -dce | dis | not grep load
%A = global int 7
%B = global int 8
implementation
int %test() {
%A1 = load int* %A
store int 123, int* %B ; Store cannot alias %A
%A2 = load int* %A
%X = sub int %A1, %A2
ret int %X
}
int %test2() {
%A1 = load int* %A
br label %Loop
Loop:
%AP = phi int [0, %0], [%X, %Loop]
store int %AP, int* %B ; Store cannot alias %A
%A2 = load int* %A
%X = sub int %A1, %A2
%c = seteq int %X, 0
br bool %c, label %out, label %Loop
out:
ret int %X
}