llvm/test/Analysis/BasicAA/2003-02-26-AccessSizeTest.ll
Chris Lattner 2271fddb6d New testcase for size tracking brokenness
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5644 91177308-0d34-0410-b5e6-96231b3b80d8
2003-02-26 21:39:52 +00:00

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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: as < %s | opt -load-vn -gcse -instcombine | 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
}