File: 2004-09-20-BadLoadCombine.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-- 641 bytes parent folder | download | duplicates (4)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
; RUN: opt < %s -instcombine -mem2reg -S | \
; RUN:   not grep {i32 1}

; When propagating the load through the select, make sure that the load is
; inserted where the original load was, not where the select is.  Not doing
; so could produce incorrect results!

define i32 @test(i1 %C) {
        %X = alloca i32         ; <i32*> [#uses=3]
        %X2 = alloca i32                ; <i32*> [#uses=2]
        store i32 1, i32* %X
        store i32 2, i32* %X2
        %Y = select i1 %C, i32* %X, i32* %X2            ; <i32*> [#uses=1]
        store i32 3, i32* %X
        %Z = load i32* %Y               ; <i32> [#uses=1]
        ret i32 %Z
}