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llvm-mirror/test/Analysis/BasicAA/2003-02-26-AccessSizeTest.ll
2008-08-16 00:00:54 +00:00

19 lines
581 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-as < %s | opt -gvn -instcombine | llvm-dis | grep DONOTREMOVE
define i32 @test() {
%A = alloca i32
store i32 0, i32* %A
%X = load i32* %A
%B = bitcast i32* %A to i8*
%C = getelementptr i8* %B, i64 1
store i8 1, i8* %C ; Aliases %A
%Y.DONOTREMOVE = load i32* %A
%Z = sub i32 %X, %Y.DONOTREMOVE
ret i32 %Z
}