1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt < %s -reassociate -S | FileCheck %s
4 ; When there is nothing to do, or not much to do, check that reassociate leaves
9 define void @test1(i32 %a, i32 %b) {
10 ; Shouldn't change or move any of the add instructions. Should commute but
11 ; otherwise not change or move any of the mul instructions.
12 ; CHECK-LABEL: @test1(
13 ; CHECK-NEXT: [[A0:%.*]] = add nsw i32 [[A:%.*]], 1
14 ; CHECK-NEXT: [[M0:%.*]] = mul nsw i32 [[A]], 3
15 ; CHECK-NEXT: [[A1:%.*]] = add nsw i32 [[A0]], [[B:%.*]]
16 ; CHECK-NEXT: [[M1:%.*]] = mul nsw i32 [[M0]], [[B]]
17 ; CHECK-NEXT: call void @use(i32 [[A1]])
18 ; CHECK-NEXT: call void @use(i32 [[M1]])
19 ; CHECK-NEXT: ret void
21 %a0 = add nsw i32 %a, 1
22 %m0 = mul nsw i32 3, %a
23 %a1 = add nsw i32 %a0, %b
24 %m1 = mul nsw i32 %b, %m0
25 call void @use(i32 %a1)
26 call void @use(i32 %m1)
30 define void @test2(i32 %a, i32 %b, i32 %c, i32 %d) {
31 ; The initial add doesn't change so should not lose the nsw flag.
32 ; CHECK-LABEL: @test2(
33 ; CHECK-NEXT: [[A0:%.*]] = add nsw i32 [[B:%.*]], [[A:%.*]]
34 ; CHECK-NEXT: [[A1:%.*]] = add i32 [[A0]], [[C:%.*]]
35 ; CHECK-NEXT: [[A2:%.*]] = add i32 [[A1]], [[D:%.*]]
36 ; CHECK-NEXT: call void @use(i32 [[A2]])
37 ; CHECK-NEXT: ret void
39 %a0 = add nsw i32 %b, %a
40 %a1 = add nsw i32 %a0, %d
41 %a2 = add nsw i32 %a1, %c
42 call void @use(i32 %a2)