; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt %s -instcombine -S | FileCheck %s

; Fold
;   (-1 u/ %x) u< %y
; to
;   @llvm.umul.with.overflow(%x, %y) + extractvalue

define i1 @t0_basic(i8 %x, i8 %y) {
; CHECK-LABEL: @t0_basic(
; CHECK-NEXT:    [[T0:%.*]] = udiv i8 -1, [[X:%.*]]
; CHECK-NEXT:    [[R:%.*]] = icmp ult i8 [[T0]], [[Y:%.*]]
; CHECK-NEXT:    ret i1 [[R]]
;
  %t0 = udiv i8 -1, %x
  %r = icmp ult i8 %t0, %y
  ret i1 %r
}

define <2 x i1> @t1_vec(<2 x i8> %x, <2 x i8> %y) {
; CHECK-LABEL: @t1_vec(
; CHECK-NEXT:    [[T0:%.*]] = udiv <2 x i8> <i8 -1, i8 -1>, [[X:%.*]]
; CHECK-NEXT:    [[R:%.*]] = icmp ult <2 x i8> [[T0]], [[Y:%.*]]
; CHECK-NEXT:    ret <2 x i1> [[R]]
;
  %t0 = udiv <2 x i8> <i8 -1, i8 -1>, %x
  %r = icmp ult <2 x i8> %t0, %y
  ret <2 x i1> %r
}

define <3 x i1> @t2_vec_undef(<3 x i8> %x, <3 x i8> %y) {
; CHECK-LABEL: @t2_vec_undef(
; CHECK-NEXT:    [[T0:%.*]] = udiv <3 x i8> <i8 -1, i8 undef, i8 -1>, [[X:%.*]]
; CHECK-NEXT:    [[R:%.*]] = icmp ult <3 x i8> [[T0]], [[Y:%.*]]
; CHECK-NEXT:    ret <3 x i1> [[R]]
;
  %t0 = udiv <3 x i8> <i8 -1, i8 undef, i8 -1>, %x
  %r = icmp ult <3 x i8> %t0, %y
  ret <3 x i1> %r
}

declare i8 @gen8()

define i1 @t3_commutative(i8 %x) {
; CHECK-LABEL: @t3_commutative(
; CHECK-NEXT:    [[T0:%.*]] = udiv i8 -1, [[X:%.*]]
; CHECK-NEXT:    [[Y:%.*]] = call i8 @gen8()
; CHECK-NEXT:    [[R:%.*]] = icmp ugt i8 [[Y]], [[T0]]
; CHECK-NEXT:    ret i1 [[R]]
;
  %t0 = udiv i8 -1, %x
  %y = call i8 @gen8()
  %r = icmp ugt i8 %y, %t0 ; swapped
  ret i1 %r
}

; Negative tests

declare void @use8(i8)

define i1 @n4_extrause(i8 %x, i8 %y) {
; CHECK-LABEL: @n4_extrause(
; CHECK-NEXT:    [[T0:%.*]] = udiv i8 -1, [[X:%.*]]
; CHECK-NEXT:    call void @use8(i8 [[T0]])
; CHECK-NEXT:    [[R:%.*]] = icmp ult i8 [[T0]], [[Y:%.*]]
; CHECK-NEXT:    ret i1 [[R]]
;
  %t0 = udiv i8 -1, %x
  call void @use8(i8 %t0)
  %r = icmp ult i8 %t0, %y
  ret i1 %r
}

define i1 @n5_not_negone(i8 %x, i8 %y) {
; CHECK-LABEL: @n5_not_negone(
; CHECK-NEXT:    [[T0:%.*]] = udiv i8 -2, [[X:%.*]]
; CHECK-NEXT:    [[R:%.*]] = icmp ult i8 [[T0]], [[Y:%.*]]
; CHECK-NEXT:    ret i1 [[R]]
;
  %t0 = udiv i8 -2, %x ; not -1
  %r = icmp ult i8 %t0, %y
  ret i1 %r
}

define i1 @n6_wrong_pred0(i8 %x, i8 %y) {
; CHECK-LABEL: @n6_wrong_pred0(
; CHECK-NEXT:    [[T0:%.*]] = udiv i8 -1, [[X:%.*]]
; CHECK-NEXT:    [[R:%.*]] = icmp ule i8 [[T0]], [[Y:%.*]]
; CHECK-NEXT:    ret i1 [[R]]
;
  %t0 = udiv i8 -1, %x
  %r = icmp ule i8 %t0, %y ; not ult
  ret i1 %r
}

define i1 @n6_wrong_pred1(i8 %x, i8 %y) {
; CHECK-LABEL: @n6_wrong_pred1(
; CHECK-NEXT:    [[T0:%.*]] = udiv i8 -1, [[X:%.*]]
; CHECK-NEXT:    [[R:%.*]] = icmp ugt i8 [[T0]], [[Y:%.*]]
; CHECK-NEXT:    ret i1 [[R]]
;
  %t0 = udiv i8 -1, %x
  %r = icmp ugt i8 %t0, %y ; not ult
  ret i1 %r
}