llvm-6502/test/Analysis/BasicAA/2003-02-26-AccessSizeTest.ll
2006-12-02 04:23:10 +00:00

19 lines
629 B
LLVM

; This testcase makes sure that size is taken to account when alias analysis
; is performed. It is not legal to delete the second load instruction because
; the value computed by the first load instruction is changed by the store.
; RUN: llvm-upgrade < %s | llvm-as | opt -load-vn -gcse -instcombine | llvm-dis | grep DONOTREMOVE
int %test() {
%A = alloca int
store int 0, int* %A
%X = load int* %A
%B = cast int* %A to sbyte*
%C = getelementptr sbyte* %B, long 1
store sbyte 1, sbyte* %C ; Aliases %A
%Y.DONOTREMOVE = load int* %A
%Z = sub int %X, %Y.DONOTREMOVE
ret int %Z
}