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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -reassociate -S | FileCheck %s
; When there is nothing to do, or not much to do, check that reassociate leaves
; things alone.
declare void @use(i32)
define void @test1(i32 %a, i32 %b) {
; Shouldn't change or move any of the add instructions. Should commute but
; otherwise not change or move any of the mul instructions.
; CHECK-LABEL: @test1(
; CHECK-NEXT: [[A0:%.*]] = add nsw i32 [[A:%.*]], 1
; CHECK-NEXT: [[M0:%.*]] = mul nsw i32 [[A]], 3
; CHECK-NEXT: [[A1:%.*]] = add nsw i32 [[A0]], [[B:%.*]]
; CHECK-NEXT: [[M1:%.*]] = mul nsw i32 [[M0]], [[B]]
; CHECK-NEXT: call void @use(i32 [[A1]])
; CHECK-NEXT: call void @use(i32 [[M1]])
; CHECK-NEXT: ret void
;
%a0 = add nsw i32 %a, 1
%m0 = mul nsw i32 3, %a
%a1 = add nsw i32 %a0, %b
%m1 = mul nsw i32 %b, %m0
call void @use(i32 %a1)
call void @use(i32 %m1)
ret void
}
define void @test2(i32 %a, i32 %b, i32 %c, i32 %d) {
; The initial add doesn't change so should not lose the nsw flag.
; CHECK-LABEL: @test2(
; CHECK-NEXT: [[A0:%.*]] = add nsw i32 [[B:%.*]], [[A:%.*]]
; CHECK-NEXT: [[A1:%.*]] = add i32 [[A0]], [[C:%.*]]
; CHECK-NEXT: [[A2:%.*]] = add i32 [[A1]], [[D:%.*]]
; CHECK-NEXT: call void @use(i32 [[A2]])
; CHECK-NEXT: ret void
;
%a0 = add nsw i32 %b, %a
%a1 = add nsw i32 %a0, %d
%a2 = add nsw i32 %a1, %c
call void @use(i32 %a2)
ret void
}
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