1 ; RUN: opt < %s -reassociate -S | FileCheck %s 2 3 ; When there is nothing to do, or not much to do, check that reassociate leaves 4 ; things alone. 5 6 declare void @use(i32) 7 8 define void @test1(i32 %a, i32 %b) { 9 ; Shouldn't change or move any of the add instructions. Should commute but 10 ; otherwise not change or move any of the mul instructions. 11 ; CHECK-LABEL: @test1( 12 %a0 = add nsw i32 %a, 1 13 ; CHECK-NEXT: %a0 = add nsw i32 %a, 1 14 %m0 = mul nsw i32 3, %a 15 ; CHECK-NEXT: %m0 = mul nsw i32 %a, 3 16 %a1 = add nsw i32 %a0, %b 17 ; CHECK-NEXT: %a1 = add nsw i32 %a0, %b 18 %m1 = mul nsw i32 %b, %m0 19 ; CHECK-NEXT: %m1 = mul nsw i32 %m0, %b 20 call void @use(i32 %a1) 21 ; CHECK-NEXT: call void @use 22 call void @use(i32 %m1) 23 ret void 24 } 25 26 define void @test2(i32 %a, i32 %b, i32 %c, i32 %d) { 27 ; The initial add doesn't change so should not lose the nsw flag. 28 ; CHECK-LABEL: @test2( 29 %a0 = add nsw i32 %b, %a 30 ; CHECK-NEXT: %a0 = add nsw i32 %b, %a 31 %a1 = add nsw i32 %a0, %d 32 ; CHECK-NEXT: %a1 = add i32 %a0, %c 33 %a2 = add nsw i32 %a1, %c 34 ; CHECK-NEXT: %a2 = add i32 %a1, %d 35 call void @use(i32 %a2) 36 ; CHECK-NEXT: call void @use 37 ret void 38 } 39
