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

declare i8 @use8(i8)
declare i16 @use16(i16)
declare i32 @use32(i32)
declare i64 @use64(i64)
declare i128 @use128(i128)
declare i130 @use130(i130)
declare <2 x i8> @use_v2i8(<2 x i8>)

; The following 16 cases are used for cover the commuted operand ADD and MUL
; with extra uses to more of these tests to exercise those cases.
;  The different _Ax suffix hints the variety of combinations MUL
;  The different _Bx suffix hints the variety of combinations ADD
;  4 tests that use in0/in1 with different commutes
define i8 @mul8_low_A0_B0(i8 %in0, i8 %in1) {
; CHECK-LABEL: @mul8_low_A0_B0(
; CHECK-NEXT:    [[RETLO:%.*]] = mul i8 [[IN0:%.*]], [[IN1:%.*]]
; CHECK-NEXT:    ret i8 [[RETLO]]
;
  %In0Lo = and i8 %in0, 15
  %In0Hi = lshr i8 %in0, 4
  %In1Lo = and i8 %in1, 15
  %In1Hi = lshr i8 %in1, 4
  %m10 = mul i8 %In1Hi, %in0
  %m01 = mul i8 %In0Hi, %in1
  %m00 = mul i8 %In1Lo, %In0Lo
  %addc = add i8 %m10, %m01
  %shl = shl i8 %addc, 4
  %retLo = add i8 %shl, %m00
  ret i8 %retLo
}

define i8 @mul8_low_A0_B1(i8 %p, i8 %in1) {
; CHECK-LABEL: @mul8_low_A0_B1(
; CHECK-NEXT:    [[IN0:%.*]] = call i8 @use8(i8 [[P:%.*]])
; CHECK-NEXT:    [[RETLO:%.*]] = mul i8 [[IN0]], [[IN1:%.*]]
; CHECK-NEXT:    ret i8 [[RETLO]]
;
  %in0 = call i8 @use8(i8 %p) ; thwart complexity-based canonicalization
  %In0Lo = and i8 %in0, 15
  %In0Hi = lshr i8 %in0, 4
  %In1Lo = and i8 %in1, 15
  %In1Hi = lshr i8 %in1, 4
  %m10 = mul i8 %in0, %In1Hi
  %m01 = mul i8 %In0Hi, %in1
  %m00 = mul i8 %In1Lo, %In0Lo
  %addc = add i8 %m10, %m01
  %shl = shl i8 %addc, 4
  %retLo = add i8 %m00, %shl
  ret i8 %retLo
}

define i8 @mul8_low_A0_B2(i8 %in0, i8 %p) {
; CHECK-LABEL: @mul8_low_A0_B2(
; CHECK-NEXT:    [[IN1:%.*]] = call i8 @use8(i8 [[P:%.*]])
; CHECK-NEXT:    [[RETLO:%.*]] = mul i8 [[IN0:%.*]], [[IN1]]
; CHECK-NEXT:    ret i8 [[RETLO]]
;

  %in1 = call i8 @use8(i8 %p) ; thwart complexity-based canonicalization
  %In0Lo = and i8 %in0, 15
  %In0Hi = lshr i8 %in0, 4
  %In1Lo = and i8 %in1, 15
  %In1Hi = lshr i8 %in1, 4
  %m10 = mul i8 %In1Hi, %in0
  %m01 = mul i8 %in1, %In0Hi
  %m00 = mul i8 %In1Lo, %In0Lo
  %addc = add i8 %m01, %m10
  %shl = shl i8 %addc, 4
  %retLo = add i8 %shl, %m00
  ret i8 %retLo
}

define i8 @mul8_low_A0_B3(i8 %p, i8 %q) {
; CHECK-LABEL: @mul8_low_A0_B3(
; CHECK-NEXT:    [[IN0:%.*]] = call i8 @use8(i8 [[P:%.*]])
; CHECK-NEXT:    [[IN1:%.*]] = call i8 @use8(i8 [[Q:%.*]])
; CHECK-NEXT:    [[RETLO:%.*]] = mul i8 [[IN0]], [[IN1]]
; CHECK-NEXT:    ret i8 [[RETLO]]
;
  %in0 = call i8 @use8(i8 %p) ; thwart complexity-based canonicalization
  %in1 = call i8 @use8(i8 %q) ; thwart complexity-based canonicalization
  %In0Lo = and i8 %in0, 15
  %In0Hi = lshr i8 %in0, 4
  %In1Lo = and i8 %in1, 15
  %In1Hi = lshr i8 %in1, 4
  %m10 = mul i8 %in0, %In1Hi
  %m01 = mul i8 %in1, %In0Hi
  %m00 = mul i8 %In1Lo, %In0Lo
  %addc = add i8 %m01, %m10
  %shl = shl i8 %addc, 4
  %retLo = add i8 %m00, %shl
  ret i8 %retLo
}

; 4 tests that use In0Lo/In1Lo with different commutes
define i16 @mul16_low_A1_B0(i16 %in0, i16 %in1) {
; CHECK-LABEL: @mul16_low_A1_B0(
; CHECK-NEXT:    [[IN0LO:%.*]] = and i16 [[IN0:%.*]], 255
; CHECK-NEXT:    [[IN0HI:%.*]] = lshr i16 [[IN0]], 8
; CHECK-NEXT:    [[IN1LO:%.*]] = and i16 [[IN1:%.*]], 255
; CHECK-NEXT:    [[IN1HI:%.*]] = lshr i16 [[IN1]], 8
; CHECK-NEXT:    [[M10:%.*]] = mul nuw i16 [[IN0LO]], [[IN1HI]]
; CHECK-NEXT:    call void @use16(i16 [[M10]])
; CHECK-NEXT:    [[M01:%.*]] = mul nuw i16 [[IN1LO]], [[IN0HI]]
; CHECK-NEXT:    call void @use16(i16 [[M01]])
; CHECK-NEXT:    [[RETLO:%.*]] = mul i16 [[IN0]], [[IN1]]
; CHECK-NEXT:    ret i16 [[RETLO]]
;
  %In0Lo = and i16 %in0, 255
  %In0Hi = lshr i16 %in0, 8
  %In1Lo = and i16 %in1, 255
  %In1Hi = lshr i16 %in1, 8
  %m10 = mul i16 %In0Lo, %In1Hi
  call void @use16(i16 %m10)
  %m01 = mul i16 %In1Lo, %In0Hi
  call void @use16(i16 %m01)
  %m00 = mul i16 %In1Lo, %In0Lo
  %addc = add i16 %m10, %m01
  %shl = shl i16 %addc, 8
  %retLo = add i16 %shl, %m00
  ret i16 %retLo
}

define i16 @mul16_low_A1_B1(i16 %in0, i16 %in1) {
; CHECK-LABEL: @mul16_low_A1_B1(
; CHECK-NEXT:    [[IN0LO:%.*]] = and i16 [[IN0:%.*]], 255
; CHECK-NEXT:    [[IN0HI:%.*]] = lshr i16 [[IN0]], 8
; CHECK-NEXT:    [[IN1LO:%.*]] = and i16 [[IN1:%.*]], 255
; CHECK-NEXT:    [[IN1HI:%.*]] = lshr i16 [[IN1]], 8
; CHECK-NEXT:    [[M10:%.*]] = mul nuw i16 [[IN0LO]], [[IN1HI]]
; CHECK-NEXT:    call void @use16(i16 [[M10]])
; CHECK-NEXT:    [[M01:%.*]] = mul nuw i16 [[IN0HI]], [[IN1LO]]
; CHECK-NEXT:    call void @use16(i16 [[M01]])
; CHECK-NEXT:    [[RETLO:%.*]] = mul i16 [[IN0]], [[IN1]]
; CHECK-NEXT:    ret i16 [[RETLO]]
;
  %In0Lo = and i16 %in0, 255
  %In0Hi = lshr i16 %in0, 8
  %In1Lo = and i16 %in1, 255
  %In1Hi = lshr i16 %in1, 8
  %m10 = mul i16 %In0Lo, %In1Hi
  call void @use16(i16 %m10)
  %m01 = mul i16 %In0Hi, %In1Lo
  call void @use16(i16 %m01)
  %m00 = mul i16 %In1Lo, %In0Lo
  %addc = add i16 %m10, %m01
  %shl = shl i16 %addc, 8
  %retLo = add i16 %m00, %shl
  ret i16 %retLo
}

define i16 @mul16_low_A1_B2(i16 %in0, i16 %in1) {
; CHECK-LABEL: @mul16_low_A1_B2(
; CHECK-NEXT:    [[IN0LO:%.*]] = and i16 [[IN0:%.*]], 255
; CHECK-NEXT:    [[IN0HI:%.*]] = lshr i16 [[IN0]], 8
; CHECK-NEXT:    [[IN1LO:%.*]] = and i16 [[IN1:%.*]], 255
; CHECK-NEXT:    [[IN1HI:%.*]] = lshr i16 [[IN1]], 8
; CHECK-NEXT:    [[M10:%.*]] = mul nuw i16 [[IN1HI]], [[IN0LO]]
; CHECK-NEXT:    call void @use16(i16 [[M10]])
; CHECK-NEXT:    [[M01:%.*]] = mul nuw i16 [[IN1LO]], [[IN0HI]]
; CHECK-NEXT:    call void @use16(i16 [[M01]])
; CHECK-NEXT:    [[RETLO:%.*]] = mul i16 [[IN0]], [[IN1]]
; CHECK-NEXT:    ret i16 [[RETLO]]
;
  %In0Lo = and i16 %in0, 255
  %In0Hi = lshr i16 %in0, 8
  %In1Lo = and i16 %in1, 255
  %In1Hi = lshr i16 %in1, 8
  %m10 = mul i16 %In1Hi, %In0Lo
  call void @use16(i16 %m10)
  %m01 = mul i16 %In1Lo, %In0Hi
  call void @use16(i16 %m01)
  %m00 = mul i16 %In1Lo, %In0Lo
  %addc = add i16 %m01, %m10
  %shl = shl i16 %addc, 8
  %retLo = add i16 %shl, %m00
  ret i16 %retLo
}

define i16 @mul16_low_A1_B3(i16 %in0, i16 %in1) {
; CHECK-LABEL: @mul16_low_A1_B3(
; CHECK-NEXT:    [[IN0LO:%.*]] = and i16 [[IN0:%.*]], 255
; CHECK-NEXT:    [[IN0HI:%.*]] = lshr i16 [[IN0]], 8
; CHECK-NEXT:    [[IN1LO:%.*]] = and i16 [[IN1:%.*]], 255
; CHECK-NEXT:    [[IN1HI:%.*]] = lshr i16 [[IN1]], 8
; CHECK-NEXT:    [[M10:%.*]] = mul nuw i16 [[IN0LO]], [[IN1HI]]
; CHECK-NEXT:    call void @use16(i16 [[M10]])
; CHECK-NEXT:    [[M01:%.*]] = mul nuw i16 [[IN1LO]], [[IN0HI]]
; CHECK-NEXT:    call void @use16(i16 [[M01]])
; CHECK-NEXT:    [[RETLO:%.*]] = mul i16 [[IN0]], [[IN1]]
; CHECK-NEXT:    ret i16 [[RETLO]]
;
  %In0Lo = and i16 %in0, 255
  %In0Hi = lshr i16 %in0, 8
  %In1Lo = and i16 %in1, 255
  %In1Hi = lshr i16 %in1, 8
  %m10 = mul i16 %In0Lo, %In1Hi
  call void @use16(i16 %m10)
  %m01 = mul i16 %In1Lo, %In0Hi
  call void @use16(i16 %m01)
  %m00 = mul i16 %In1Lo, %In0Lo
  %addc = add i16 %m01, %m10
  %shl = shl i16 %addc, 8
  %retLo = add i16 %m00, %shl
  ret i16 %retLo
}

; 4 tests that use In0Lo/in1 with different commutes
define i32 @mul32_low_A2_B0(i32 %in0, i32 %in1) {
; CHECK-LABEL: @mul32_low_A2_B0(
; CHECK-NEXT:    [[IN0LO:%.*]] = and i32 [[IN0:%.*]], 65535
; CHECK-NEXT:    [[IN1HI:%.*]] = lshr i32 [[IN1:%.*]], 16
; CHECK-NEXT:    [[M10:%.*]] = mul nuw i32 [[IN1HI]], [[IN0LO]]
; CHECK-NEXT:    call void @use32(i32 [[M10]])
; CHECK-NEXT:    [[RETLO:%.*]] = mul i32 [[IN0]], [[IN1]]
; CHECK-NEXT:    ret i32 [[RETLO]]
;
  %In0Lo = and i32 %in0, 65535
  %In0Hi = lshr i32 %in0, 16
  %In1Lo = and i32 %in1, 65535
  %In1Hi = lshr i32 %in1, 16
  %m10 = mul i32 %In1Hi, %In0Lo
  call void @use32(i32 %m10)
  %m01 = mul i32 %In0Hi, %in1
  %m00 = mul i32 %In1Lo, %In0Lo
  %addc = add i32 %m10, %m01
  %shl = shl i32 %addc, 16
  %retLo = add i32 %shl, %m00
  ret i32 %retLo
}

define i32 @mul32_low_A2_B1(i32 %in0, i32 %in1) {
; CHECK-LABEL: @mul32_low_A2_B1(
; CHECK-NEXT:    [[IN0LO:%.*]] = and i32 [[IN0:%.*]], 65535
; CHECK-NEXT:    [[IN1HI:%.*]] = lshr i32 [[IN1:%.*]], 16
; CHECK-NEXT:    [[M10:%.*]] = mul nuw i32 [[IN1HI]], [[IN0LO]]
; CHECK-NEXT:    call void @use32(i32 [[M10]])
; CHECK-NEXT:    [[RETLO:%.*]] = mul i32 [[IN0]], [[IN1]]
; CHECK-NEXT:    ret i32 [[RETLO]]
;
  %In0Lo = and i32 %in0, 65535
  %In0Hi = lshr i32 %in0, 16
  %In1Lo = and i32 %in1, 65535
  %In1Hi = lshr i32 %in1, 16
  %m10 = mul i32 %In1Hi, %In0Lo
  call void @use32(i32 %m10)
  %m01 = mul i32 %In0Hi, %in1
  %m00 = mul i32 %In1Lo, %In0Lo
  %addc = add i32 %m10, %m01
  %shl = shl i32 %addc, 16
  %retLo = add i32 %m00, %shl
  ret i32 %retLo
}

define i32 @mul32_low_A2_B2(i32 %in0, i32 %p) {
; CHECK-LABEL: @mul32_low_A2_B2(
; CHECK-NEXT:    [[IN1:%.*]] = call i32 @use32(i32 [[P:%.*]])
; CHECK-NEXT:    [[IN0LO:%.*]] = and i32 [[IN0:%.*]], 65535
; CHECK-NEXT:    [[IN1HI:%.*]] = lshr i32 [[IN1]], 16
; CHECK-NEXT:    [[M10:%.*]] = mul nuw i32 [[IN0LO]], [[IN1HI]]
; CHECK-NEXT:    call void @use32(i32 [[M10]])
; CHECK-NEXT:    [[RETLO:%.*]] = mul i32 [[IN0]], [[IN1]]
; CHECK-NEXT:    ret i32 [[RETLO]]
;
  %in1 = call i32 @use32(i32 %p) ; thwart complexity-based canonicalization
  %In0Lo = and i32 %in0, 65535
  %In0Hi = lshr i32 %in0, 16
  %In1Lo = and i32 %in1, 65535
  %In1Hi = lshr i32 %in1, 16
  %m10 = mul i32 %In0Lo, %In1Hi
  call void @use32(i32 %m10)
  %m01 = mul i32 %in1, %In0Hi
  %m00 = mul i32 %In1Lo, %In0Lo
  %addc = add i32 %m01, %m10
  %shl = shl i32 %addc, 16
  %retLo = add i32 %shl, %m00
  ret i32 %retLo
}

define i32 @mul32_low_A2_B3(i32 %in0, i32 %p) {
; CHECK-LABEL: @mul32_low_A2_B3(
; CHECK-NEXT:    [[IN1:%.*]] = call i32 @use32(i32 [[P:%.*]])
; CHECK-NEXT:    [[IN0LO:%.*]] = and i32 [[IN0:%.*]], 65535
; CHECK-NEXT:    [[IN1HI:%.*]] = lshr i32 [[IN1]], 16
; CHECK-NEXT:    [[M10:%.*]] = mul nuw i32 [[IN1HI]], [[IN0LO]]
; CHECK-NEXT:    call void @use32(i32 [[M10]])
; CHECK-NEXT:    [[RETLO:%.*]] = mul i32 [[IN0]], [[IN1]]
; CHECK-NEXT:    ret i32 [[RETLO]]
;
  %in1 = call i32 @use32(i32 %p) ; thwart complexity-based canonicalization
  %In0Lo = and i32 %in0, 65535
  %In0Hi = lshr i32 %in0, 16
  %In1Lo = and i32 %in1, 65535
  %In1Hi = lshr i32 %in1, 16
  %m10 = mul i32 %In1Hi, %In0Lo
  call void @use32(i32 %m10)
  %m01 = mul i32 %in1, %In0Hi
  %m00 = mul i32 %In1Lo, %In0Lo
  %addc = add i32 %m01, %m10
  %shl = shl i32 %addc, 16
  %retLo = add i32 %m00, %shl
  ret i32 %retLo
}

; 4 tests that use in0/In1Lo with different commutes
define i64 @mul64_low_A3_B0(i64 %in0, i64 %in1) {
; CHECK-LABEL: @mul64_low_A3_B0(
; CHECK-NEXT:    [[IN0HI:%.*]] = lshr i64 [[IN0:%.*]], 32
; CHECK-NEXT:    [[IN1LO:%.*]] = and i64 [[IN1:%.*]], 4294967295
; CHECK-NEXT:    [[M01:%.*]] = mul nuw i64 [[IN0HI]], [[IN1LO]]
; CHECK-NEXT:    call void @use64(i64 [[M01]])
; CHECK-NEXT:    [[RETLO:%.*]] = mul i64 [[IN0]], [[IN1]]
; CHECK-NEXT:    ret i64 [[RETLO]]
;
  %In0Lo = and i64 %in0, 4294967295
  %In0Hi = lshr i64 %in0, 32
  %In1Lo = and i64 %in1, 4294967295
  %In1Hi = lshr i64 %in1, 32
  %m10 = mul i64 %In1Hi, %in0
  %m01 = mul i64 %In0Hi, %In1Lo
  call void @use64(i64 %m01)
  %m00 = mul i64 %In1Lo, %In0Lo
  %addc = add i64 %m10, %m01
  %shl = shl i64 %addc, 32
  %retLo = add i64 %shl, %m00
  ret i64 %retLo
}

define i64 @mul64_low_A3_B1(i64 %in0, i64 %in1) {
; CHECK-LABEL: @mul64_low_A3_B1(
; CHECK-NEXT:    [[IN0HI:%.*]] = lshr i64 [[IN0:%.*]], 32
; CHECK-NEXT:    [[IN1LO:%.*]] = and i64 [[IN1:%.*]], 4294967295
; CHECK-NEXT:    [[M01:%.*]] = mul nuw i64 [[IN0HI]], [[IN1LO]]
; CHECK-NEXT:    call void @use64(i64 [[M01]])
; CHECK-NEXT:    [[RETLO:%.*]] = mul i64 [[IN0]], [[IN1]]
; CHECK-NEXT:    ret i64 [[RETLO]]
;
  %In0Lo = and i64 %in0, 4294967295
  %In0Hi = lshr i64 %in0, 32
  %In1Lo = and i64 %in1, 4294967295
  %In1Hi = lshr i64 %in1, 32
  %m10 = mul i64 %In1Hi, %in0
  %m01 = mul i64 %In0Hi, %In1Lo
  call void @use64(i64 %m01)
  %m00 = mul i64 %In1Lo, %In0Lo
  %addc = add i64 %m10, %m01
  %shl = shl i64 %addc, 32
  %retLo = add i64 %m00, %shl
  ret i64 %retLo
}

define i64 @mul64_low_A3_B2(i64 %p, i64 %in1) {
; CHECK-LABEL: @mul64_low_A3_B2(
; CHECK-NEXT:    [[IN0:%.*]] = call i64 @use64(i64 [[P:%.*]])
; CHECK-NEXT:    [[IN0HI:%.*]] = lshr i64 [[IN0]], 32
; CHECK-NEXT:    [[IN1LO:%.*]] = and i64 [[IN1:%.*]], 4294967295
; CHECK-NEXT:    [[M01:%.*]] = mul nuw i64 [[IN0HI]], [[IN1LO]]
; CHECK-NEXT:    call void @use64(i64 [[M01]])
; CHECK-NEXT:    [[RETLO:%.*]] = mul i64 [[IN0]], [[IN1]]
; CHECK-NEXT:    ret i64 [[RETLO]]
;
  %in0 = call i64 @use64(i64 %p) ; thwart complexity-based canonicalization
  %In0Lo = and i64 %in0, 4294967295
  %In0Hi = lshr i64 %in0, 32
  %In1Lo = and i64 %in1, 4294967295
  %In1Hi = lshr i64 %in1, 32
  %m10 = mul i64 %in0, %In1Hi
  %m01 = mul i64 %In0Hi, %In1Lo
  call void @use64(i64 %m01)
  %m00 = mul i64 %In1Lo, %In0Lo
  %addc = add i64 %m01, %m10
  %shl = shl i64 %addc, 32
  %retLo = add i64 %shl, %m00
  ret i64 %retLo
}

define i64 @mul64_low_A3_B3(i64 %p, i64 %in1) {
; CHECK-LABEL: @mul64_low_A3_B3(
; CHECK-NEXT:    [[IN0:%.*]] = call i64 @use64(i64 [[P:%.*]])
; CHECK-NEXT:    [[IN0HI:%.*]] = lshr i64 [[IN0]], 32
; CHECK-NEXT:    [[IN1LO:%.*]] = and i64 [[IN1:%.*]], 4294967295
; CHECK-NEXT:    [[M01:%.*]] = mul nuw i64 [[IN1LO]], [[IN0HI]]
; CHECK-NEXT:    call void @use64(i64 [[M01]])
; CHECK-NEXT:    [[RETLO:%.*]] = mul i64 [[IN0]], [[IN1]]
; CHECK-NEXT:    ret i64 [[RETLO]]
;
  %in0 = call i64 @use64(i64 %p) ; thwart complexity-based canonicalization
  %In0Lo = and i64 %in0, 4294967295
  %In0Hi = lshr i64 %in0, 32
  %In1Lo = and i64 %in1, 4294967295
  %In1Hi = lshr i64 %in1, 32
  %m10 = mul i64 %in0, %In1Hi
  %m01 = mul i64 %In1Lo, %In0Hi
  call void @use64(i64 %m01)
  %m00 = mul i64 %In1Lo, %In0Lo
  %addc = add i64 %m01, %m10
  %shl = shl i64 %addc, 32
  %retLo = add i64 %m00, %shl
  ret i64 %retLo
}

define i32 @mul32_low_one_extra_user(i32 %in0, i32 %in1) {
; CHECK-LABEL: @mul32_low_one_extra_user(
; CHECK-NEXT:    [[IN0LO:%.*]] = and i32 [[IN0:%.*]], 65535
; CHECK-NEXT:    [[IN0HI:%.*]] = lshr i32 [[IN0]], 16
; CHECK-NEXT:    [[IN1LO:%.*]] = and i32 [[IN1:%.*]], 65535
; CHECK-NEXT:    [[IN1HI:%.*]] = lshr i32 [[IN1]], 16
; CHECK-NEXT:    [[M10:%.*]] = mul nuw i32 [[IN1HI]], [[IN0LO]]
; CHECK-NEXT:    [[M01:%.*]] = mul nuw i32 [[IN1LO]], [[IN0HI]]
; CHECK-NEXT:    [[ADDC:%.*]] = add i32 [[M10]], [[M01]]
; CHECK-NEXT:    call void @use32(i32 [[ADDC]])
; CHECK-NEXT:    [[RETLO:%.*]] = mul i32 [[IN0]], [[IN1]]
; CHECK-NEXT:    ret i32 [[RETLO]]
;
  %In0Lo = and i32 %in0, 65535
  %In0Hi = lshr i32 %in0, 16
  %In1Lo = and i32 %in1, 65535
  %In1Hi = lshr i32 %in1, 16
  %m10 = mul i32 %In1Hi, %In0Lo
  %m01 = mul i32 %In1Lo, %In0Hi
  %m00 = mul i32 %In1Lo, %In0Lo
  %addc = add i32 %m10, %m01
  call void @use32(i32 %addc)
  %shl = shl i32 %addc, 16
  %retLo = add i32 %shl, %m00
  ret i32 %retLo
}

; The following are variety types of target cases
; https://alive2.llvm.org/ce/z/2BqKLt
define i8 @mul8_low(i8 %in0, i8 %in1) {
; CHECK-LABEL: @mul8_low(
; CHECK-NEXT:    [[RETLO:%.*]] = mul i8 [[IN0:%.*]], [[IN1:%.*]]
; CHECK-NEXT:    ret i8 [[RETLO]]
;
  %In0Lo = and i8 %in0, 15
  %In0Hi = lshr i8 %in0, 4
  %In1Lo = and i8 %in1, 15
  %In1Hi = lshr i8 %in1, 4
  %m10 = mul i8 %In1Hi, %In0Lo
  %m01 = mul i8 %In1Lo, %In0Hi
  %m00 = mul i8 %In1Lo, %In0Lo
  %addc = add i8 %m10, %m01
  %shl = shl i8 %addc, 4
  %retLo = add i8 %shl, %m00
  ret i8 %retLo
}

define i16 @mul16_low(i16 %in0, i16 %in1) {
; CHECK-LABEL: @mul16_low(
; CHECK-NEXT:    [[RETLO:%.*]] = mul i16 [[IN0:%.*]], [[IN1:%.*]]
; CHECK-NEXT:    ret i16 [[RETLO]]
;
  %In0Lo = and i16 %in0, 255
  %In0Hi = lshr i16 %in0, 8
  %In1Lo = and i16 %in1, 255
  %In1Hi = lshr i16 %in1, 8
  %m10 = mul i16 %In1Hi, %In0Lo
  %m01 = mul i16 %In1Lo, %In0Hi
  %m00 = mul i16 %In1Lo, %In0Lo
  %addc = add i16 %m10, %m01
  %shl = shl i16 %addc, 8
  %retLo = add i16 %shl, %m00
  ret i16 %retLo
}

define i32 @mul32_low(i32 %in0, i32 %in1) {
; CHECK-LABEL: @mul32_low(
; CHECK-NEXT:    [[RETLO:%.*]] = mul i32 [[IN0:%.*]], [[IN1:%.*]]
; CHECK-NEXT:    ret i32 [[RETLO]]
;
  %In0Lo = and i32 %in0, 65535
  %In0Hi = lshr i32 %in0, 16
  %In1Lo = and i32 %in1, 65535
  %In1Hi = lshr i32 %in1, 16
  %m10 = mul i32 %In1Hi, %In0Lo
  %m01 = mul i32 %In1Lo, %In0Hi
  %m00 = mul i32 %In1Lo, %In0Lo
  %addc = add i32 %m10, %m01
  %shl = shl i32 %addc, 16
  %retLo = add i32 %shl, %m00
  ret i32 %retLo
}

define i64 @mul64_low(i64 %in0, i64 %in1) {
; CHECK-LABEL: @mul64_low(
; CHECK-NEXT:    [[RETLO:%.*]] = mul i64 [[IN0:%.*]], [[IN1:%.*]]
; CHECK-NEXT:    ret i64 [[RETLO]]
;
  %In0Lo = and i64 %in0, 4294967295
  %In0Hi = lshr i64 %in0, 32
  %In1Lo = and i64 %in1, 4294967295
  %In1Hi = lshr i64 %in1, 32
  %m10 = mul i64 %In1Hi, %In0Lo
  %m01 = mul i64 %In1Lo, %In0Hi
  %m00 = mul i64 %In1Lo, %In0Lo
  %addc = add i64 %m10, %m01
  %shl = shl i64 %addc, 32
  %retLo = add i64 %shl, %m00
  ret i64 %retLo
}

define i128 @mul128_low(i128 %in0, i128 %in1) {
; CHECK-LABEL: @mul128_low(
; CHECK-NEXT:    [[RETLO:%.*]] = mul i128 [[IN0:%.*]], [[IN1:%.*]]
; CHECK-NEXT:    ret i128 [[RETLO]]
;
  %In0Lo = and i128 %in0, 18446744073709551615
  %In0Hi = lshr i128 %in0, 64
  %In1Lo = and i128 %in1, 18446744073709551615
  %In1Hi = lshr i128 %in1, 64
  %m10 = mul i128 %In1Hi, %In0Lo
  %m01 = mul i128 %In1Lo, %In0Hi
  %m00 = mul i128 %In1Lo, %In0Lo
  %addc = add i128 %m10, %m01
  %shl = shl i128 %addc, 64
  %retLo = add i128 %shl, %m00
  ret i128 %retLo
}

; Support vector type
define <2 x i8> @mul_v2i8_low(<2 x i8> %in0, <2 x i8> %in1) {
; CHECK-LABEL: @mul_v2i8_low(
; CHECK-NEXT:    [[RETLO:%.*]] = mul <2 x i8> [[IN0:%.*]], [[IN1:%.*]]
; CHECK-NEXT:    ret <2 x i8> [[RETLO]]
;
  %In0Lo = and <2 x i8> %in0, <i8 15, i8 15>
  %In0Hi = lshr <2 x i8> %in0, <i8 4, i8 4>
  %In1Lo = and <2 x i8> %in1, <i8 15, i8 15>
  %In1Hi = lshr <2 x i8> %in1, <i8 4, i8 4>
  %m10 = mul <2 x i8> %In1Hi, %In0Lo
  %m01 = mul <2 x i8> %In1Lo, %In0Hi
  %m00 = mul <2 x i8> %In1Lo, %In0Lo
  %addc = add <2 x i8> %m10, %m01
  %shl = shl <2 x i8> %addc, <i8 4, i8 4>
  %retLo = add <2 x i8> %shl, %m00
  ret <2 x i8> %retLo
}

define <2 x i8> @mul_v2i8_low_one_extra_user(<2 x i8> %in0, <2 x i8> %in1) {
; CHECK-LABEL: @mul_v2i8_low_one_extra_user(
; CHECK-NEXT:    [[IN0HI:%.*]] = lshr <2 x i8> [[IN0:%.*]], splat (i8 4)
; CHECK-NEXT:    [[IN1LO:%.*]] = and <2 x i8> [[IN1:%.*]], splat (i8 15)
; CHECK-NEXT:    [[M01:%.*]] = mul nuw <2 x i8> [[IN1LO]], [[IN0HI]]
; CHECK-NEXT:    call void @use_v2i8(<2 x i8> [[M01]])
; CHECK-NEXT:    [[RETLO:%.*]] = mul <2 x i8> [[IN0]], [[IN1]]
; CHECK-NEXT:    ret <2 x i8> [[RETLO]]
;
  %In0Lo = and <2 x i8> %in0, <i8 15, i8 15>
  %In0Hi = lshr <2 x i8> %in0, <i8 4, i8 4>
  %In1Lo = and <2 x i8> %in1, <i8 15, i8 15>
  %In1Hi = lshr <2 x i8> %in1, <i8 4, i8 4>
  %m10 = mul <2 x i8> %In1Hi, %In0Lo
  %m01 = mul <2 x i8> %In1Lo, %In0Hi
  call void @use_v2i8(<2 x i8> %m01)
  %m00 = mul <2 x i8> %In1Lo, %In0Lo
  %addc = add <2 x i8> %m10, %m01
  %shl = shl <2 x i8> %addc, <i8 4, i8 4>
  %retLo = add <2 x i8> %shl, %m00
  ret <2 x i8> %retLo
}

; Support wide width
define i130 @mul130_low(i130 %in0, i130 %in1) {
; CHECK-LABEL: @mul130_low(
; CHECK-NEXT:    [[RETLO:%.*]] = mul i130 [[IN0:%.*]], [[IN1:%.*]]
; CHECK-NEXT:    ret i130 [[RETLO]]
;
  %In0Lo = and i130 %in0, 36893488147419103231
  %In0Hi = lshr i130 %in0, 65
  %In1Lo = and i130 %in1, 36893488147419103231
  %In1Hi = lshr i130 %in1, 65
  %m10 = mul i130 %In1Hi, %In0Lo
  %m01 = mul i130 %In1Lo, %In0Hi
  %m00 = mul i130 %In1Lo, %In0Lo
  %addc = add i130 %m10, %m01
  %shl = shl i130 %addc, 65
  %retLo = add i130 %shl, %m00
  ret i130 %retLo
}

define i130 @mul130_low_one_extra_user(i130 %in0, i130 %in1) {
; CHECK-LABEL: @mul130_low_one_extra_user(
; CHECK-NEXT:    [[IN0LO:%.*]] = and i130 [[IN0:%.*]], 36893488147419103231
; CHECK-NEXT:    [[IN1HI:%.*]] = lshr i130 [[IN1:%.*]], 65
; CHECK-NEXT:    [[M10:%.*]] = mul nuw i130 [[IN1HI]], [[IN0LO]]
; CHECK-NEXT:    call void @use130(i130 [[M10]])
; CHECK-NEXT:    [[RETLO:%.*]] = mul i130 [[IN0]], [[IN1]]
; CHECK-NEXT:    ret i130 [[RETLO]]
;
  %In0Lo = and i130 %in0, 36893488147419103231
  %In0Hi = lshr i130 %in0, 65
  %In1Lo = and i130 %in1, 36893488147419103231
  %In1Hi = lshr i130 %in1, 65
  %m10 = mul i130 %In1Hi, %In0Lo
  call void @use130(i130 %m10)
  %m01 = mul i130 %In1Lo, %In0Hi
  %m00 = mul i130 %In1Lo, %In0Lo
  %addc = add i130 %m10, %m01
  %shl = shl i130 %addc, 65
  %retLo = add i130 %shl, %m00
  ret i130 %retLo
}

; Negative case: Skip odd bitwidth type
define i9 @mul9_low(i9 %in0, i9 %in1) {
; CHECK-LABEL: @mul9_low(
; CHECK-NEXT:    [[IN0LO:%.*]] = and i9 [[IN0:%.*]], 15
; CHECK-NEXT:    [[IN0HI:%.*]] = lshr i9 [[IN0]], 4
; CHECK-NEXT:    [[IN1LO:%.*]] = and i9 [[IN1:%.*]], 15
; CHECK-NEXT:    [[IN1HI:%.*]] = lshr i9 [[IN1]], 4
; CHECK-NEXT:    [[M10:%.*]] = mul nuw i9 [[IN1HI]], [[IN0LO]]
; CHECK-NEXT:    [[M01:%.*]] = mul nuw i9 [[IN1LO]], [[IN0HI]]
; CHECK-NEXT:    [[M00:%.*]] = mul nuw nsw i9 [[IN1LO]], [[IN0LO]]
; CHECK-NEXT:    [[ADDC:%.*]] = add i9 [[M10]], [[M01]]
; CHECK-NEXT:    [[SHL:%.*]] = shl i9 [[ADDC]], 4
; CHECK-NEXT:    [[RETLO:%.*]] = add i9 [[SHL]], [[M00]]
; CHECK-NEXT:    ret i9 [[RETLO]]
;
  %In0Lo = and i9 %in0, 15
  %In0Hi = lshr i9 %in0, 4
  %In1Lo = and i9 %in1, 15
  %In1Hi = lshr i9 %in1, 4
  %m10 = mul i9 %In1Hi, %In0Lo
  %m01 = mul i9 %In1Lo, %In0Hi
  %m00 = mul i9 %In1Lo, %In0Lo
  %addc = add i9 %m10, %m01
  %shl = shl i9 %addc, 4
  %retLo = add i9 %shl, %m00
  ret i9 %retLo
}

; Negative test: Should not remote the "and", https://alive2.llvm.org/ce/z/JLmNU5
define i64 @mul64_low_no_and(i64 %in0, i64 %in1) {
; CHECK-LABEL: @mul64_low_no_and(
; CHECK-NEXT:    [[IN0HI:%.*]] = lshr i64 [[IN0:%.*]], 32
; CHECK-NEXT:    [[IN1HI:%.*]] = lshr i64 [[IN1:%.*]], 32
; CHECK-NEXT:    [[M10:%.*]] = mul i64 [[IN1HI]], [[IN0]]
; CHECK-NEXT:    [[M01:%.*]] = mul i64 [[IN1]], [[IN0HI]]
; CHECK-NEXT:    [[M00:%.*]] = mul i64 [[IN1]], [[IN0]]
; CHECK-NEXT:    [[ADDC:%.*]] = add i64 [[M10]], [[M01]]
; CHECK-NEXT:    [[SHL:%.*]] = shl i64 [[ADDC]], 32
; CHECK-NEXT:    [[RETLO:%.*]] = add i64 [[SHL]], [[M00]]
; CHECK-NEXT:    ret i64 [[RETLO]]
;
  %In0Hi = lshr i64 %in0, 32
  %In1Hi = lshr i64 %in1, 32
  %m10 = mul i64 %In1Hi, %in0
  %m01 = mul i64 %in1, %In0Hi
  %m00 = mul i64 %in1, %in0
  %addc = add i64 %m10, %m01
  %shl = shl i64 %addc, 32
  %retLo = add i64 %shl, %m00
  ret i64 %retLo
}

; Negative test: Miss match the shift amount
define i16 @mul16_low_miss_shift_amount(i16 %in0, i16 %in1) {
; CHECK-LABEL: @mul16_low_miss_shift_amount(
; CHECK-NEXT:    [[IN0LO:%.*]] = and i16 [[IN0:%.*]], 127
; CHECK-NEXT:    [[IN0HI:%.*]] = lshr i16 [[IN0]], 8
; CHECK-NEXT:    [[IN1LO:%.*]] = and i16 [[IN1:%.*]], 127
; CHECK-NEXT:    [[IN1HI:%.*]] = lshr i16 [[IN1]], 8
; CHECK-NEXT:    [[M10:%.*]] = mul nuw nsw i16 [[IN1HI]], [[IN0LO]]
; CHECK-NEXT:    [[M01:%.*]] = mul nuw nsw i16 [[IN1LO]], [[IN0HI]]
; CHECK-NEXT:    [[M00:%.*]] = mul nuw nsw i16 [[IN1LO]], [[IN0LO]]
; CHECK-NEXT:    [[ADDC:%.*]] = add nuw i16 [[M10]], [[M01]]
; CHECK-NEXT:    [[SHL:%.*]] = shl i16 [[ADDC]], 8
; CHECK-NEXT:    [[RETLO:%.*]] = add i16 [[SHL]], [[M00]]
; CHECK-NEXT:    ret i16 [[RETLO]]
;
  %In0Lo = and i16 %in0, 127 ; Should be 255
  %In0Hi = lshr i16 %in0, 8
  %In1Lo = and i16 %in1, 127
  %In1Hi = lshr i16 %in1, 8
  %m10 = mul i16 %In1Hi, %In0Lo
  %m01 = mul i16 %In1Lo, %In0Hi
  %m00 = mul i16 %In1Lo, %In0Lo
  %addc = add i16 %m10, %m01
  %shl = shl i16 %addc, 8
  %retLo = add i16 %shl, %m00
  ret i16 %retLo
}

; Negative test: Miss match the half width
define i8 @mul8_low_miss_half_width(i8 %in0, i8 %in1) {
; CHECK-LABEL: @mul8_low_miss_half_width(
; CHECK-NEXT:    [[IN0LO:%.*]] = and i8 [[IN0:%.*]], 15
; CHECK-NEXT:    [[IN0HI:%.*]] = lshr i8 [[IN0]], 3
; CHECK-NEXT:    [[IN1LO:%.*]] = and i8 [[IN1:%.*]], 15
; CHECK-NEXT:    [[IN1HI:%.*]] = lshr i8 [[IN1]], 3
; CHECK-NEXT:    [[M10:%.*]] = mul i8 [[IN1HI]], [[IN0LO]]
; CHECK-NEXT:    [[M01:%.*]] = mul i8 [[IN1LO]], [[IN0HI]]
; CHECK-NEXT:    [[M00:%.*]] = mul nuw i8 [[IN1LO]], [[IN0LO]]
; CHECK-NEXT:    [[ADDC:%.*]] = add i8 [[M10]], [[M01]]
; CHECK-NEXT:    [[SHL:%.*]] = shl i8 [[ADDC]], 3
; CHECK-NEXT:    [[RETLO:%.*]] = add i8 [[SHL]], [[M00]]
; CHECK-NEXT:    ret i8 [[RETLO]]
;
  %In0Lo = and i8 %in0, 15
  %In0Hi = lshr i8 %in0, 3 ; Should be 4
  %In1Lo = and i8 %in1, 15
  %In1Hi = lshr i8 %in1, 3
  %m10 = mul i8 %In1Hi, %In0Lo
  %m01 = mul i8 %In1Lo, %In0Hi
  %m00 = mul i8 %In1Lo, %In0Lo
  %addc = add i8 %m10, %m01
  %shl = shl i8 %addc, 3
  %retLo = add i8 %shl, %m00
  ret i8 %retLo
}

; Test case to show shl doesn't need hasOneUse constraint
define i32 @mul32_low_extra_shl_use(i32 %in0, i32 %in1) {
; CHECK-LABEL: @mul32_low_extra_shl_use(
; CHECK-NEXT:    [[IN0HI:%.*]] = lshr i32 [[IN0:%.*]], 16
; CHECK-NEXT:    [[IN1HI:%.*]] = lshr i32 [[IN1:%.*]], 16
; CHECK-NEXT:    [[M10:%.*]] = mul i32 [[IN1HI]], [[IN0]]
; CHECK-NEXT:    [[M01:%.*]] = mul i32 [[IN1]], [[IN0HI]]
; CHECK-NEXT:    [[ADDC:%.*]] = add i32 [[M10]], [[M01]]
; CHECK-NEXT:    [[SHL:%.*]] = shl i32 [[ADDC]], 16
; CHECK-NEXT:    call void @use32(i32 [[SHL]])
; CHECK-NEXT:    [[RETLO:%.*]] = mul i32 [[IN0]], [[IN1]]
; CHECK-NEXT:    ret i32 [[RETLO]]
;
  %In0Lo = and i32 %in0, 65535
  %In0Hi = lshr i32 %in0, 16
  %In1Lo = and i32 %in1, 65535
  %In1Hi = lshr i32 %in1, 16
  %m10 = mul i32 %In1Hi, %In0Lo
  %m01 = mul i32 %In1Lo, %In0Hi
  %m00 = mul i32 %In1Lo, %In0Lo
  %addc = add i32 %m10, %m01
  %shl = shl i32 %addc, 16
  call void @use32(i32 %shl)
  %retLo = add i32 %shl, %m00
  ret i32 %retLo
}