llvm-project/llvm/test/Transforms/InstCombine/mul.ll

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

define i32 @pow2_multiplier(i32 %A) {
; CHECK-LABEL: @pow2_multiplier(
; CHECK-NEXT:    [[B:%.*]] = shl i32 [[A:%.*]], 1
; CHECK-NEXT:    ret i32 [[B]]
;
  %B = mul i32 %A, 2
  ret i32 %B
}

define <2 x i32> @pow2_multiplier_vec(<2 x i32> %A) {
; CHECK-LABEL: @pow2_multiplier_vec(
; CHECK-NEXT:    [[B:%.*]] = shl <2 x i32> [[A:%.*]], <i32 3, i32 3>
; CHECK-NEXT:    ret <2 x i32> [[B]]
;
  %B = mul <2 x i32> %A, <i32 8, i32 8>
  ret <2 x i32> %B
}

define i8 @combine_shl(i8 %A) {
; CHECK-LABEL: @combine_shl(
; CHECK-NEXT:    [[C:%.*]] = shl i8 [[A:%.*]], 6
; CHECK-NEXT:    ret i8 [[C]]
;
  %B = mul i8 %A, 8
  %C = mul i8 %B, 8
  ret i8 %C
}

define i32 @neg(i32 %i) {
; CHECK-LABEL: @neg(
; CHECK-NEXT:    [[TMP:%.*]] = sub i32 0, [[I:%.*]]
; CHECK-NEXT:    ret i32 [[TMP]]
;
  %tmp = mul i32 %i, -1
  ret i32 %tmp
}

; Use the sign-bit as a mask:
; (zext (A < 0)) * B --> (A >> 31) & B

define i32 @test10(i32 %a, i32 %b) {
; CHECK-LABEL: @test10(
; CHECK-NEXT:    [[TMP1:%.*]] = ashr i32 [[A:%.*]], 31
; CHECK-NEXT:    [[E:%.*]] = and i32 [[TMP1]], [[B:%.*]]
; CHECK-NEXT:    ret i32 [[E]]
;
  %c = icmp slt i32 %a, 0
  %d = zext i1 %c to i32
  %e = mul i32 %d, %b
  ret i32 %e
}

define i32 @test11(i32 %a, i32 %b) {
; CHECK-LABEL: @test11(
; CHECK-NEXT:    [[TMP1:%.*]] = ashr i32 [[A:%.*]], 31
; CHECK-NEXT:    [[E:%.*]] = and i32 [[TMP1]], [[B:%.*]]
; CHECK-NEXT:    ret i32 [[E]]
;
  %c = icmp sle i32 %a, -1
  %d = zext i1 %c to i32
  %e = mul i32 %d, %b
  ret i32 %e
}

declare void @use32(i32)

define i32 @test12(i32 %a, i32 %b) {
; CHECK-LABEL: @test12(
; CHECK-NEXT:    [[A_LOBIT:%.*]] = lshr i32 [[A:%.*]], 31
; CHECK-NEXT:    [[TMP1:%.*]] = ashr i32 [[A]], 31
; CHECK-NEXT:    [[E:%.*]] = and i32 [[TMP1]], [[B:%.*]]
; CHECK-NEXT:    call void @use32(i32 [[A_LOBIT]])
; CHECK-NEXT:    ret i32 [[E]]
;
  %c = icmp ugt i32 %a, 2147483647
  %d = zext i1 %c to i32
  %e = mul i32 %d, %b
  call void @use32(i32 %d)
  ret i32 %e
}

; rdar://7293527
define i32 @test15(i32 %A, i32 %B) {
; CHECK-LABEL: @test15(
; CHECK-NEXT:    [[M:%.*]] = shl i32 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    ret i32 [[M]]
;
  %shl = shl i32 1, %B
  %m = mul i32 %shl, %A
  ret i32 %m
}

; X * Y (when Y is a boolean) --> Y ? X : 0

define i32 @mul_bool(i32 %x, i1 %y) {
; CHECK-LABEL: @mul_bool(
; CHECK-NEXT:    [[M:%.*]] = select i1 [[Y:%.*]], i32 [[X:%.*]], i32 0
; CHECK-NEXT:    ret i32 [[M]]
;
  %z = zext i1 %y to i32
  %m = mul i32 %x, %z
  ret i32 %m
}

; Commute and test vector type.

define <2 x i32> @mul_bool_vec(<2 x i32> %x, <2 x i1> %y) {
; CHECK-LABEL: @mul_bool_vec(
; CHECK-NEXT:    [[M:%.*]] = select <2 x i1> [[Y:%.*]], <2 x i32> [[X:%.*]], <2 x i32> zeroinitializer
; CHECK-NEXT:    ret <2 x i32> [[M]]
;
  %z = zext <2 x i1> %y to <2 x i32>
  %m = mul <2 x i32> %x, %z
  ret <2 x i32> %m
}

define <2 x i32> @mul_bool_vec_commute(<2 x i32> %x, <2 x i1> %y) {
; CHECK-LABEL: @mul_bool_vec_commute(
; CHECK-NEXT:    [[M:%.*]] = select <2 x i1> [[Y:%.*]], <2 x i32> [[X:%.*]], <2 x i32> zeroinitializer
; CHECK-NEXT:    ret <2 x i32> [[M]]
;
  %z = zext <2 x i1> %y to <2 x i32>
  %m = mul <2 x i32> %z, %x
  ret <2 x i32> %m
}

; (A >>u 31) * B --> (A >>s 31) & B

define i32 @signbit_mul(i32 %a, i32 %b) {
; CHECK-LABEL: @signbit_mul(
; CHECK-NEXT:    [[TMP1:%.*]] = ashr i32 [[A:%.*]], 31
; CHECK-NEXT:    [[E:%.*]] = and i32 [[TMP1]], [[B:%.*]]
; CHECK-NEXT:    ret i32 [[E]]
;
  %d = lshr i32 %a, 31
  %e = mul i32 %d, %b
  ret i32 %e
}

define i32 @signbit_mul_commute_extra_use(i32 %a, i32 %b) {
; CHECK-LABEL: @signbit_mul_commute_extra_use(
; CHECK-NEXT:    [[D:%.*]] = lshr i32 [[A:%.*]], 31
; CHECK-NEXT:    [[TMP1:%.*]] = ashr i32 [[A]], 31
; CHECK-NEXT:    [[E:%.*]] = and i32 [[TMP1]], [[B:%.*]]
; CHECK-NEXT:    call void @use32(i32 [[D]])
; CHECK-NEXT:    ret i32 [[E]]
;
  %d = lshr i32 %a, 31
  %e = mul i32 %b, %d
  call void @use32(i32 %d)
  ret i32 %e
}

; (A >>u 31)) * B --> (A >>s 31) & B

define <2 x i32> @signbit_mul_vec(<2 x i32> %a, <2 x i32> %b) {
; CHECK-LABEL: @signbit_mul_vec(
; CHECK-NEXT:    [[D:%.*]] = lshr <2 x i32> [[A:%.*]], <i32 31, i32 31>
; CHECK-NEXT:    [[E:%.*]] = mul nuw <2 x i32> [[D]], [[B:%.*]]
; CHECK-NEXT:    ret <2 x i32> [[E]]
;
  %d = lshr <2 x i32> %a, <i32 31, i32 31>
  %e = mul <2 x i32> %d, %b
  ret <2 x i32> %e
}

define <2 x i32> @signbit_mul_vec_commute(<2 x i32> %a, <2 x i32> %b) {
; CHECK-LABEL: @signbit_mul_vec_commute(
; CHECK-NEXT:    [[D:%.*]] = lshr <2 x i32> [[A:%.*]], <i32 31, i32 31>
; CHECK-NEXT:    [[E:%.*]] = mul nuw <2 x i32> [[D]], [[B:%.*]]
; CHECK-NEXT:    ret <2 x i32> [[E]]
;
  %d = lshr <2 x i32> %a, <i32 31, i32 31>
  %e = mul <2 x i32> %b, %d
  ret <2 x i32> %e
}

define i32 @test18(i32 %A, i32 %B) {
; CHECK-LABEL: @test18(
; CHECK-NEXT:    ret i32 0
;
  %C = and i32 %A, 1
  %D = and i32 %B, 1
  %E = mul i32 %C, %D
  %F = and i32 %E, 16
  ret i32 %F
}

declare {i32, i1} @llvm.smul.with.overflow.i32(i32, i32)
declare void @use(i1)

define i32 @test19(i32 %A, i32 %B) {
; CHECK-LABEL: @test19(
; CHECK-NEXT:    call void @use(i1 false)
; CHECK-NEXT:    ret i32 0
;
  %C = and i32 %A, 1
  %D = and i32 %B, 1

; It would be nice if we also started proving that this doesn't overflow.
  %E = call {i32, i1} @llvm.smul.with.overflow.i32(i32 %C, i32 %D)
  %F = extractvalue {i32, i1} %E, 0
  %G = extractvalue {i32, i1} %E, 1
  call void @use(i1 %G)
  %H = and i32 %F, 16
  ret i32 %H
}

define <2 x i64> @test20(<2 x i64> %A) {
; CHECK-LABEL: @test20(
; CHECK-NEXT:    [[TMP1:%.*]] = mul <2 x i64> [[A:%.*]], <i64 3, i64 2>
; CHECK-NEXT:    [[C:%.*]] = add <2 x i64> [[TMP1]], <i64 36, i64 28>
; CHECK-NEXT:    ret <2 x i64> [[C]]
;
  %B = add <2 x i64> %A, <i64 12, i64 14>
  %C = mul <2 x i64> %B, <i64 3, i64 2>
  ret <2 x i64> %C
}

define <2 x i1> @test21(<2 x i1> %A, <2 x i1> %B) {
; CHECK-LABEL: @test21(
; CHECK-NEXT:    [[C:%.*]] = and <2 x i1> [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    ret <2 x i1> [[C]]
;
  %C = mul <2 x i1> %A, %B
  ret <2 x i1> %C
}

define i32 @test22(i32 %A) {
; CHECK-LABEL: @test22(
; CHECK-NEXT:    [[B:%.*]] = sub nsw i32 0, [[A:%.*]]
; CHECK-NEXT:    ret i32 [[B]]
;
  %B = mul nsw i32 %A, -1
  ret i32 %B
}

define i32 @test23(i32 %A) {
; CHECK-LABEL: @test23(
; CHECK-NEXT:    [[C:%.*]] = mul nuw i32 [[A:%.*]], 6
; CHECK-NEXT:    ret i32 [[C]]
;
  %B = shl nuw i32 %A, 1
  %C = mul nuw i32 %B, 3
  ret i32 %C
}

define i32 @test24(i32 %A) {
; CHECK-LABEL: @test24(
; CHECK-NEXT:    [[C:%.*]] = mul nsw i32 [[A:%.*]], 6
; CHECK-NEXT:    ret i32 [[C]]
;
  %B = shl nsw i32 %A, 1
  %C = mul nsw i32 %B, 3
  ret i32 %C
}

define i32 @test25(i32 %A, i32 %B) {
; CHECK-LABEL: @test25(
; CHECK-NEXT:    [[E:%.*]] = mul nsw i32 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    ret i32 [[E]]
;
  %C = sub nsw i32 0, %A
  %D = sub nsw i32 0, %B
  %E = mul nsw i32 %C, %D
  ret i32 %E
}

define i32 @test26(i32 %A, i32 %B) {
; CHECK-LABEL: @test26(
; CHECK-NEXT:    [[D:%.*]] = shl nsw i32 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    ret i32 [[D]]
;
  %C = shl nsw i32 1, %B
  %D = mul nsw i32 %A, %C
  ret i32 %D
}

define i32 @test27(i32 %A, i32 %B) {
; CHECK-LABEL: @test27(
; CHECK-NEXT:    [[D:%.*]] = shl nuw i32 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    ret i32 [[D]]
;
  %C = shl i32 1, %B
  %D = mul nuw i32 %A, %C
  ret i32 %D
}

define i32 @test28(i32 %A) {
; CHECK-LABEL: @test28(
; CHECK-NEXT:    [[B:%.*]] = shl i32 1, [[A:%.*]]
; CHECK-NEXT:    [[C:%.*]] = shl i32 [[B]], [[A]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %B = shl i32 1, %A
  %C = mul nsw i32 %B, %B
  ret i32 %C
}

define i64 @test29(i31 %A, i31 %B) {
; CHECK-LABEL: @test29(
; CHECK-NEXT:    [[C:%.*]] = sext i31 [[A:%.*]] to i64
; CHECK-NEXT:    [[D:%.*]] = sext i31 [[B:%.*]] to i64
; CHECK-NEXT:    [[E:%.*]] = mul nsw i64 [[C]], [[D]]
; CHECK-NEXT:    ret i64 [[E]]
;
  %C = sext i31 %A to i64
  %D = sext i31 %B to i64
  %E = mul i64 %C, %D
  ret i64 %E
}

define i64 @test30(i32 %A, i32 %B) {
; CHECK-LABEL: @test30(
; CHECK-NEXT:    [[C:%.*]] = zext i32 [[A:%.*]] to i64
; CHECK-NEXT:    [[D:%.*]] = zext i32 [[B:%.*]] to i64
; CHECK-NEXT:    [[E:%.*]] = mul nuw i64 [[C]], [[D]]
; CHECK-NEXT:    ret i64 [[E]]
;
  %C = zext i32 %A to i64
  %D = zext i32 %B to i64
  %E = mul i64 %C, %D
  ret i64 %E
}

@PR22087 = external global i32
define i32 @test31(i32 %V) {
; CHECK-LABEL: @test31(
; CHECK-NEXT:    [[MUL:%.*]] = shl i32 [[V:%.*]], zext (i1 icmp ne (i32* inttoptr (i64 1 to i32*), i32* @PR22087) to i32)
; CHECK-NEXT:    ret i32 [[MUL]]
;
  %mul = mul i32 %V, shl (i32 1, i32 zext (i1 icmp ne (i32* inttoptr (i64 1 to i32*), i32* @PR22087) to i32))
  ret i32 %mul
}

define i32 @test32(i32 %X) {
; CHECK-LABEL: @test32(
; CHECK-NEXT:    [[MUL:%.*]] = shl i32 [[X:%.*]], 31
; CHECK-NEXT:    ret i32 [[MUL]]
;
  %mul = mul nsw i32 %X, -2147483648
  ret i32 %mul
}

define <2 x i32> @test32vec(<2 x i32> %X) {
; CHECK-LABEL: @test32vec(
; CHECK-NEXT:    [[MUL:%.*]] = shl nsw <2 x i32> [[X:%.*]], <i32 31, i32 31>
; CHECK-NEXT:    ret <2 x i32> [[MUL]]
;
  %mul = mul nsw <2 x i32> %X, <i32 -2147483648, i32 -2147483648>
  ret <2 x i32> %mul
}

define i32 @test33(i32 %X) {
; CHECK-LABEL: @test33(
; CHECK-NEXT:    [[MUL:%.*]] = shl nsw i32 [[X:%.*]], 30
; CHECK-NEXT:    ret i32 [[MUL]]
;
  %mul = mul nsw i32 %X, 1073741824
  ret i32 %mul
}

define <2 x i32> @test33vec(<2 x i32> %X) {
; CHECK-LABEL: @test33vec(
; CHECK-NEXT:    [[MUL:%.*]] = shl nsw <2 x i32> [[X:%.*]], <i32 30, i32 30>
; CHECK-NEXT:    ret <2 x i32> [[MUL]]
;
  %mul = mul nsw <2 x i32> %X, <i32 1073741824, i32 1073741824>
  ret <2 x i32> %mul
}

define i128 @test34(i128 %X) {
; CHECK-LABEL: @test34(
; CHECK-NEXT:    [[MUL:%.*]] = shl nsw i128 [[X:%.*]], 1
; CHECK-NEXT:    ret i128 [[MUL]]
;
  %mul = mul nsw i128 %X, 2
  ret i128 %mul
}