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
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
; RUN: llvm-as < %s | opt -reassociate -gvn | llvm-dis | grep add | count 6
; Each of these functions should turn into two adds each.
@e = external global i32 ; <i32*> [#uses=3]
@a = external global i32 ; <i32*> [#uses=3]
@b = external global i32 ; <i32*> [#uses=3]
@c = external global i32 ; <i32*> [#uses=3]
@f = external global i32 ; <i32*> [#uses=3]
define void @test1() {
%A = load i32* @a ; <i32> [#uses=2]
%B = load i32* @b ; <i32> [#uses=2]
%C = load i32* @c ; <i32> [#uses=2]
%t1 = add i32 %A, %B ; <i32> [#uses=1]
%t2 = add i32 %t1, %C ; <i32> [#uses=1]
%t3 = add i32 %C, %A ; <i32> [#uses=1]
%t4 = add i32 %t3, %B ; <i32> [#uses=1]
; e = (a+b)+c;
store i32 %t2, i32* @e
; f = (a+c)+b
store i32 %t4, i32* @f
ret void
}
define void @test2() {
%A = load i32* @a ; <i32> [#uses=2]
%B = load i32* @b ; <i32> [#uses=2]
%C = load i32* @c ; <i32> [#uses=2]
%t1 = add i32 %A, %B ; <i32> [#uses=1]
%t2 = add i32 %t1, %C ; <i32> [#uses=1]
%t3 = add i32 %C, %A ; <i32> [#uses=1]
%t4 = add i32 %t3, %B ; <i32> [#uses=1]
; e = c+(a+b)
store i32 %t2, i32* @e
; f = (c+a)+b
store i32 %t4, i32* @f
ret void
}
define void @test3() {
%A = load i32* @a ; <i32> [#uses=2]
%B = load i32* @b ; <i32> [#uses=2]
%C = load i32* @c ; <i32> [#uses=2]
%t1 = add i32 %B, %A ; <i32> [#uses=1]
%t2 = add i32 %t1, %C ; <i32> [#uses=1]
%t3 = add i32 %C, %A ; <i32> [#uses=1]
%t4 = add i32 %t3, %B ; <i32> [#uses=1]
; e = c+(b+a)
store i32 %t2, i32* @e
; f = (c+a)+b
store i32 %t4, i32* @f
ret void
}
|
