File: 2004-09-20-BadLoadCombine2.ll

package info (click to toggle)
llvm-toolchain-7 1%3A7.0.1-8
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 733,456 kB
  • sloc: cpp: 3,776,651; ansic: 633,271; asm: 350,301; python: 142,716; objc: 107,612; sh: 22,626; lisp: 11,056; perl: 7,999; pascal: 6,742; ml: 5,537; awk: 3,536; makefile: 2,557; cs: 2,027; xml: 841; ruby: 156
file content (25 lines) | stat: -rw-r--r-- 864 bytes parent folder | download | duplicates (15)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
; RUN: opt < %s -instcombine -mem2reg -simplifycfg | \
; RUN:   llvm-dis | grep -v store | not grep "i32 1"

; Test to make sure that instcombine does not accidentally propagate the load
; into the PHI, which would break the program.

define i32 @test(i1 %C) {
entry:
        %X = alloca i32         ; <i32*> [#uses=3]
        %X2 = alloca i32                ; <i32*> [#uses=2]
        store i32 1, i32* %X
        store i32 2, i32* %X2
        br i1 %C, label %cond_true.i, label %cond_continue.i

cond_true.i:            ; preds = %entry
        br label %cond_continue.i

cond_continue.i:                ; preds = %cond_true.i, %entry
        %mem_tmp.i.0 = phi i32* [ %X, %cond_true.i ], [ %X2, %entry ]           ; <i32*> [#uses=1]
        store i32 3, i32* %X
        %tmp.3 = load i32, i32* %mem_tmp.i.0         ; <i32> [#uses=1]
        ret i32 %tmp.3
}