File: 2003-02-26-AccessSizeTest.ll

package info (click to toggle)
llvm-3.0 3.0-10
  • links: PTS, VCS
  • area: main
  • in suites: wheezy
  • size: 75,412 kB
  • sloc: cpp: 468,043; asm: 109,345; ansic: 13,782; sh: 12,935; ml: 4,716; python: 4,351; perl: 2,096; makefile: 1,905; pascal: 1,578; exp: 389; xml: 283; lisp: 187; csh: 117
file content (18 lines) | stat: -rw-r--r-- 572 bytes parent folder | download | duplicates (3)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
; 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: opt < %s -basicaa -gvn -instcombine -S | 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
}