llvm-6502/test/Analysis/BasicAA/licmtest.ll

; Test that LICM uses basicaa to do alias analysis, which is capable of 
; disambiguating some obvious cases.  If LICM is able to disambiguate the
; two pointers, then the load should be hoisted, and the store sunk.  Thus
; the loop becomes empty and can be deleted by ADCE. 

; RUN: if as < %s | opt -basicaa -licm --adce | dis | grep Loop
; RUN: then exit 1
; RUN: else exit 0
; RUN: fi

%A = global int 7
%B = global int 8
implementation

int %test(bool %c) {
	%Atmp = load int* %A
	br label %Loop
Loop:
	%ToRemove = load int* %A
	store int %Atmp, int* %B  ; Store cannot alias %A

	br bool %c, label %Out, label %Loop
Out:
	%X = sub int %ToRemove, %Atmp
	ret int %X
}