1; RUN: opt < %s -reassociate -constprop -instcombine -dce -S | FileCheck %s
2
3; With sub reassociation, constant folding can eliminate all of the constants.
4define i32 @test1(i32 %A, i32 %B) {
5; CHECK-LABEL: test1
6; CHECK-NEXT: %Z = sub i32 %A, %B
7; CHECK-NEXT: ret i32 %Z
8
9  %W = add i32 5, %B
10  %X = add i32 -7, %A
11  %Y = sub i32 %X, %W
12  %Z = add i32 %Y, 12
13  ret i32 %Z
14}
15
16; With sub reassociation, constant folding can eliminate the two 12 constants.
17define i32 @test2(i32 %A, i32 %B, i32 %C, i32 %D) {
18; CHECK-LABEL: test2
19; CHECK-NEXT: %sum = add i32 %B, %A
20; CHECK-NEXT: %sum1 = add i32 %sum, %C
21; CHECK-NEXT: %Q = sub i32 %D, %sum1
22; CHECK-NEXT: ret i32 %Q
23
24  %M = add i32 %A, 12
25  %N = add i32 %M, %B
26  %O = add i32 %N, %C
27  %P = sub i32 %D, %O
28  %Q = add i32 %P, 12
29  ret i32 %Q
30}
31