llvm-project/llvm/test/Transforms/InstCombine/add2.ll

; RUN: opt < %s -instcombine -S | FileCheck %s

define i64 @test1(i64 %A, i32 %B) {
        %tmp12 = zext i32 %B to i64
        %tmp3 = shl i64 %tmp12, 32
        %tmp5 = add i64 %tmp3, %A
        %tmp6 = and i64 %tmp5, 123
        ret i64 %tmp6
; CHECK-LABEL: @test1(
; CHECK-NEXT: and i64 %A, 123
; CHECK-NEXT: ret i64
}

define i32 @test2(i32 %A) {
  %B = and i32 %A, 7
  %C = and i32 %A, 32
  %F = add i32 %B, %C
  ret i32 %F
; CHECK-LABEL: @test2(
; CHECK-NEXT: and i32 %A, 39
; CHECK-NEXT: ret i32
}

define i32 @test3(i32 %A) {
  %B = and i32 %A, 128
  %C = lshr i32 %A, 30
  %F = add i32 %B, %C
  ret i32 %F
; CHECK-LABEL: @test3(
; CHECK-NEXT: and
; CHECK-NEXT: lshr
; CHECK-NEXT: or i32 %B, %C
; CHECK-NEXT: ret i32
}

define i32 @test4(i32 %A) {
  %B = add nuw i32 %A, %A
  ret i32 %B
; CHECK-LABEL: @test4(
; CHECK-NEXT: %B = shl nuw i32 %A, 1
; CHECK-NEXT: ret i32 %B
}

define <2 x i1> @test5(<2 x i1> %A, <2 x i1> %B) {
  %add = add <2 x i1> %A, %B
  ret <2 x i1> %add
; CHECK-LABEL: @test5(
; CHECK-NEXT: %add = xor <2 x i1> %A, %B
; CHECK-NEXT: ret <2 x i1> %add
}

define <2 x i64> @test6(<2 x i64> %A) {
  %shl = shl <2 x i64> %A, <i64 2, i64 3>
  %add = add <2 x i64> %shl, %A
  ret <2 x i64> %add
; CHECK-LABEL: @test6(
; CHECK-NEXT: %add = mul <2 x i64> %A, <i64 5, i64 9>
; CHECK-NEXT: ret <2 x i64> %add
}

define <2 x i64> @test7(<2 x i64> %A) {
  %shl = shl <2 x i64> %A, <i64 2, i64 3>
  %mul = mul <2 x i64> %A, <i64 3, i64 4>
  %add = add <2 x i64> %shl, %mul
  ret <2 x i64> %add
; CHECK-LABEL: @test7(
; CHECK-NEXT: %add = mul <2 x i64> %A, <i64 7, i64 12>
; CHECK-NEXT: ret <2 x i64> %add
}

define <2 x i64> @test8(<2 x i64> %A) {
  %xor = xor <2 x i64> %A, <i64 -1, i64 -1>
  %add = add <2 x i64> %xor, <i64 2, i64 3>
  ret <2 x i64> %add
; CHECK-LABEL: @test8(
; CHECK-NEXT: %add = sub <2 x i64> <i64 1, i64 2>, %A
; CHECK-NEXT: ret <2 x i64> %add
}

define i16 @test9(i16 %a) {
       %b = mul i16 %a, 2
       %c = mul i16 %a, 32767
       %d = add i16 %b, %c
       ret i16 %d
; CHECK-LABEL: @test9(
; CHECK-NEXT:  %d = mul i16 %a, -32767
; CHECK-NEXT:  ret i16 %d
}

; y + (~((x >> 3) & 0x55555555) + 1) -> y - ((x >> 3) & 0x55555555)
define i32 @test10(i32 %x, i32 %y) {
  %shr = ashr i32 %x, 3
  %shr.not = or i32 %shr, -1431655766
  %neg = xor i32 %shr.not, 1431655765
  %add = add i32 %y, 1
  %add1 = add i32 %add, %neg
  ret i32 %add1
; CHECK-LABEL: @test10(
; CHECK-NEXT: [[SHR:%[a-z0-9]+]] = ashr i32 %x, 3
; CHECK-NEXT: [[AND:%[a-z0-9]+]] = and i32 [[SHR]], 1431655765
; CHECK-NEXT: [[SUB:%[a-z0-9]+]] = sub i32 %y, [[AND]]
; CHECK-NEXT: ret i32 [[SUB]]
}

; y + (~(x & 0x55555555) + 1) -> y - (x & 0x55555555)
define i32 @test11(i32 %x, i32 %y) {
  %x.not = or i32 %x, -1431655766
  %neg = xor i32 %x.not, 1431655765
  %add = add i32 %y, 1
  %add1 = add i32 %add, %neg
  ret i32 %add1
; CHECK-LABEL: @test11(
; CHECK-NEXT: [[AND:%[a-z0-9]+]] = and i32 %x, 1431655765
; CHECK-NEXT: [[SUB:%[a-z0-9]+]] = sub i32 %y, [[AND]]
; CHECK-NEXT: ret i32 [[SUB]]
}

; (y + 1) + ~(x & 0x55555555) -> y - (x & 0x55555555)
define i32 @test12(i32 %x, i32 %y) {
  %add = add nsw i32 %y, 1
  %x.not = or i32 %x, -1431655766
  %neg = xor i32 %x.not, 1431655765
  %add1 = add nsw i32 %add, %neg
  ret i32 %add1
; CHECK-LABEL: @test12(
; CHECK-NEXT: [[AND:%[a-z0-9]+]] = and i32 %x, 1431655765
; CHECK-NEXT: [[SUB:%[a-z0-9]+]] = sub i32 %y, [[AND]]
; CHECK-NEXT: ret i32 [[SUB]]
}

; y + (~(x & 0x55555556) + 1) -> y - (x & 0x55555556)
define i32 @test13(i32 %x, i32 %y) {
  %x.not = or i32 %x, -1431655767
  %neg = xor i32 %x.not, 1431655766
  %add = add i32 %y, 1
  %add1 = add i32 %add, %neg
  ret i32 %add1
; CHECK-LABEL: @test13(
; CHECK-NEXT: [[AND:%[a-z0-9]+]] = and i32 %x, 1431655766
; CHECK-NEXT: [[SUB:%[a-z0-9]+]] = sub i32 %y, [[AND]]
; CHECK-NEXT: ret i32 [[SUB]]
}

; (y + 1) + ~(x & 0x55555556) -> y - (x & 0x55555556)
define i32 @test14(i32 %x, i32 %y) {
  %add = add nsw i32 %y, 1
  %x.not = or i32 %x, -1431655767
  %neg = xor i32 %x.not, 1431655766
  %add1 = add nsw i32 %add, %neg
  ret i32 %add1
; CHECK-LABEL: @test14(
; CHECK-NEXT: [[AND:%[a-z0-9]+]] = and i32 %x, 1431655766
; CHECK-NEXT: [[SUB:%[a-z0-9]+]] = sub i32 %y, [[AND]]
; CHECK-NEXT: ret i32 [[SUB]]
}

; y + (~(x | 0x55555556) + 1) -> y - (x | 0x55555556)
define i32 @test15(i32 %x, i32 %y) {
  %x.not = and i32 %x, -1431655767
  %neg = xor i32 %x.not, -1431655767
  %add = add i32 %y, 1
  %add1 = add i32 %add, %neg
  ret i32 %add1
; CHECK-LABEL: @test15(
; CHECK-NEXT: [[AND:%[a-z0-9]+]] = or i32 %x, 1431655766
; CHECK-NEXT: [[SUB:%[a-z0-9]+]] = sub i32 %y, [[AND]]
; CHECK-NEXT: ret i32 [[SUB]]
}

; (y + 1) + ~(x | 0x55555556) -> y - (x | 0x555555556)
define i32 @test16(i32 %x, i32 %y) {
  %add = add nsw i32 %y, 1
  %x.not = and i32 %x, -1431655767
  %neg = xor i32 %x.not, -1431655767
  %add1 = add nsw i32 %add, %neg
  ret i32 %add1
; CHECK-LABEL: @test16(
; CHECK-NEXT: [[AND:%[a-z0-9]+]] = or i32 %x, 1431655766
; CHECK-NEXT: [[SUB:%[a-z0-9]+]] = sub i32 %y, [[AND]]
; CHECK-NEXT: ret i32 [[SUB]]
}

; y + (~(x | 0x55555555) + 1) -> y - (x | 0x55555555)
define i32 @test17(i32 %x, i32 %y) {
  %x.not = and i32 %x, -1431655766
  %add2 = xor i32 %x.not, -1431655765
  %add1 = add nsw i32 %add2, %y
  ret i32 %add1
; CHECK-LABEL: @test17(
; CHECK-NEXT: [[AND:%[a-z0-9]+]] = or i32 %x, 1431655765
; CHECK-NEXT: [[SUB:%[a-z0-9]+]] = sub i32 %y, [[AND]]
; CHECK-NEXT: ret i32 [[SUB]]
}

; (y + 1) + ~(x | 0x55555555) -> y - (x | 0x55555555)
define i32 @test18(i32 %x, i32 %y) {
  %add = add nsw i32 %y, 1
  %x.not = and i32 %x, -1431655766
  %neg = xor i32 %x.not, -1431655766
  %add1 = add nsw i32 %add, %neg
  ret i32 %add1
; CHECK-LABEL: @test18(
; CHECK-NEXT: [[AND:%[a-z0-9]+]] = or i32 %x, 1431655765
; CHECK-NEXT: [[SUB:%[a-z0-9]+]] = sub i32 %y, [[AND]]
; CHECK-NEXT: ret i32 [[SUB]]
}

define i16 @add_nsw_mul_nsw(i16 %x) {
 %add1 = add nsw i16 %x, %x
 %add2 = add nsw i16 %add1, %x
 ret i16 %add2
; CHECK-LABEL: @add_nsw_mul_nsw(
; CHECK-NEXT: %add2 = mul nsw i16 %x, 3
; CHECK-NEXT: ret i16 %add2
}

define i16 @mul_add_to_mul_1(i16 %x) {
 %mul1 = mul nsw i16 %x, 8
 %add2 = add nsw i16 %x, %mul1
 ret i16 %add2
; CHECK-LABEL: @mul_add_to_mul_1(
; CHECK-NEXT: %add2 = mul nsw i16 %x, 9
; CHECK-NEXT: ret i16 %add2
}

define i16 @mul_add_to_mul_2(i16 %x) {
 %mul1 = mul nsw i16 %x, 8
 %add2 = add nsw i16 %mul1, %x
 ret i16 %add2
; CHECK-LABEL: @mul_add_to_mul_2(
; CHECK-NEXT: %add2 = mul nsw i16 %x, 9
; CHECK-NEXT: ret i16 %add2
}

define i16 @mul_add_to_mul_3(i16 %a) {
 %mul1 = mul i16 %a, 2
 %mul2 = mul i16 %a, 3
 %add = add nsw i16 %mul1, %mul2
 ret i16 %add
; CHECK-LABEL: @mul_add_to_mul_3(
; CHECK-NEXT: %add = mul i16 %a, 5
; CHECK-NEXT: ret i16 %add
}

define i16 @mul_add_to_mul_4(i16 %a) {
 %mul1 = mul nsw i16 %a, 2
 %mul2 = mul nsw i16 %a, 7
 %add = add nsw i16 %mul1, %mul2
 ret i16 %add
; CHECK-LABEL: @mul_add_to_mul_4(
; CHECK-NEXT: %add = mul nsw i16 %a, 9
; CHECK-NEXT: ret i16 %add
}

define i16 @mul_add_to_mul_5(i16 %a) {
 %mul1 = mul nsw i16 %a, 3
 %mul2 = mul nsw i16 %a, 7
 %add = add nsw i16 %mul1, %mul2
 ret i16 %add
; CHECK-LABEL: @mul_add_to_mul_5(
; CHECK-NEXT: %add = mul nsw i16 %a, 10
; CHECK-NEXT: ret i16 %add
}

define i32 @mul_add_to_mul_6(i32 %x, i32 %y) {
  %mul1 = mul nsw i32 %x, %y
  %mul2 = mul nsw i32 %mul1, 5
  %add = add nsw i32 %mul1, %mul2
  ret i32 %add
; CHECK-LABEL: @mul_add_to_mul_6(
; CHECK-NEXT: %mul1 = mul nsw i32 %x, %y
; CHECK-NEXT: %add = mul nsw i32 %mul1, 6
; CHECK-NEXT: ret i32 %add
}

define i16 @mul_add_to_mul_7(i16 %x) {
  %mul1 = mul nsw i16 %x, 32767
  %add2 = add nsw i16 %x, %mul1
  ret i16 %add2
; CHECK-LABEL: @mul_add_to_mul_7(
; CHECK-NEXT: %add2 = shl i16 %x, 15
; CHECK-NEXT: ret i16 %add2
}

define i16 @mul_add_to_mul_8(i16 %a) {
  %mul1 = mul nsw i16 %a, 16383
  %mul2 = mul nsw i16 %a, 16384
  %add = add nsw i16 %mul1, %mul2
  ret i16 %add
; CHECK-LABEL: @mul_add_to_mul_8(
; CHECK-NEXT: %add = mul nsw i16 %a, 32767
; CHECK-NEXT: ret i16 %add
}

define i16 @mul_add_to_mul_9(i16 %a) {
  %mul1 = mul nsw i16 %a, 16384
  %mul2 = mul nsw i16 %a, 16384
  %add = add nsw i16 %mul1, %mul2
  ret i16 %add
; CHECK-LABEL: @mul_add_to_mul_9(
; CHECK-NEXT: %add = shl i16 %a, 15
; CHECK-NEXT: ret i16 %add
}

; This test and the next test verify that when a range metadata is attached to
; llvm.cttz, ValueTracking correctly intersects the range specified by the
; metadata and the range implied by the intrinsic.
;
; In this test, the range specified by the metadata is more strict. Therefore,
; ValueTracking uses that range.
define i16 @add_cttz(i16 %a) {
; CHECK-LABEL: @add_cttz(
  ; llvm.cttz.i16(..., /*is_zero_undefined=*/true) implies the value returned
  ; is in [0, 16). The range metadata indicates the value returned is in [0, 8).
  ; Intersecting these ranges, we know the value returned is in [0, 8).
  ; Therefore, InstCombine will transform
  ;     add %cttz, 1111 1111 1111 1000 ; decimal -8
  ; to
  ;     or  %cttz, 1111 1111 1111 1000
  %cttz = call i16 @llvm.cttz.i16(i16 %a, i1 true), !range !0
  %b = add i16 %cttz, -8
; CHECK: or i16 %cttz, -8
  ret i16 %b
}
declare i16 @llvm.cttz.i16(i16, i1)
!0 = !{i16 0, i16 8}

; Similar to @add_cttz, but in this test, the range implied by the
; intrinsic is more strict. Therefore, ValueTracking uses that range.
define i16 @add_cttz_2(i16 %a) {
; CHECK-LABEL: @add_cttz_2(
  ; llvm.cttz.i16(..., /*is_zero_undefined=*/true) implies the value returned
  ; is in [0, 16). The range metadata indicates the value returned is in
  ; [0, 32). Intersecting these ranges, we know the value returned is in
  ; [0, 16). Therefore, InstCombine will transform
  ;     add %cttz, 1111 1111 1111 0000 ; decimal -16
  ; to
  ;     or  %cttz, 1111 1111 1111 0000
  %cttz = call i16 @llvm.cttz.i16(i16 %a, i1 true), !range !1
  %b = add i16 %cttz, -16
; CHECK: or i16 %cttz, -16
  ret i16 %b
}
!1 = !{i16 0, i16 32}

define i32 @add_or_and(i32 %x, i32 %y) {
  %or = or i32 %x, %y
  %and = and i32 %x, %y
  %add = add i32 %or, %and
  ret i32 %add
; CHECK-LABEL: @add_or_and(
; CHECK-NEXT: add i32 %x, %y
; CHECK-NEXT: ret i32
}

define i32 @add_nsw_or_and(i32 %x, i32 %y) {
  %or = or i32 %x, %y
  %and = and i32 %x, %y
  %add = add nsw i32 %or, %and
  ret i32 %add
; CHECK-LABEL: @add_nsw_or_and(
; CHECK-NEXT: add nsw i32 %x, %y
; CHECK-NEXT: ret i32
}

define i32 @add_nuw_or_and(i32 %x, i32 %y) {
  %or = or i32 %x, %y
  %and = and i32 %x, %y
  %add = add nuw i32 %or, %and
  ret i32 %add
; CHECK-LABEL: @add_nuw_or_and(
; CHECK-NEXT: add nuw i32 %x, %y
; CHECK-NEXT: ret i32
}

define i32 @add_nuw_nsw_or_and(i32 %x, i32 %y) {
  %or = or i32 %x, %y
  %and = and i32 %x, %y
  %add = add nsw nuw i32 %or, %and
  ret i32 %add
; CHECK-LABEL: @add_nuw_nsw_or_and(
; CHECK-NEXT: add nuw nsw i32 %x, %y
; CHECK-NEXT: ret i32
}

; A *nsw B + A *nsw C != A *nsw (B + C)
; e.g. A = -1, B = 1, C = INT_SMAX

define i8 @add_of_mul(i8 %x, i8 %y, i8 %z) {
; CHECK-LABEL: @add_of_mul(
 entry:
  %mA = mul nsw i8 %x, %y
  %mB = mul nsw i8 %x, %z
; CHECK: %sum = mul i8
  %sum = add nsw i8 %mA, %mB
  ret i8 %sum
}

define i32 @add_of_selects(i1 %A, i32 %B) {
  %sel0 = select i1 %A, i32 0, i32 -2
  %sel1 = select i1 %A, i32 %B, i32 2
  %add = add i32 %sel0, %sel1
  ret i32 %add
; CHECK-LABEL: @add_of_selects(
; CHECK-NEXT: %[[sel:.*]] = select i1 %A, i32 %B, i32 0
; CHECK-NEXT: ret i32 %[[sel]]
}