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comparison test/Analysis/BasicAA/2003-02-26-AccessSizeTest.ll @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
parents
children afa8332a0e37
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-1:000000000000 0:95c75e76d11b
1 ; This testcase makes sure that size is taken to account when alias analysis
2 ; is performed. It is not legal to delete the second load instruction because
3 ; the value computed by the first load instruction is changed by the store.
4
5 ; RUN: opt < %s -basicaa -gvn -instcombine -S | FileCheck %s
6
7 define i32 @test() {
8 ; CHECK: %Y.DONOTREMOVE = load i32* %A
9 ; CHECK: %Z = sub i32 0, %Y.DONOTREMOVE
10 %A = alloca i32
11 store i32 0, i32* %A
12 %X = load i32* %A
13 %B = bitcast i32* %A to i8*
14 %C = getelementptr i8* %B, i64 1
15 store i8 1, i8* %C ; Aliases %A
16 %Y.DONOTREMOVE = load i32* %A
17 %Z = sub i32 %X, %Y.DONOTREMOVE
18 ret i32 %Z
19 }
20