llvm/test/Transforms/InstSimplify/and-or-icmp-zero.ll

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

; In the next 8 tests (4 commutes * 2 (and/or)), eliminate the simple (not) null
; check because that compare is implied by the masked compare of the same operand.
; Vary types between scalar and vector and weird for extra coverage.

; or (icmp eq (and X, ?), 0), (icmp eq X, 0) --> icmp eq (and X, ?), 0

define i1 @or_cmps_eq_zero_with_mask_commute1(i64 %x, i64 %y) {
; CHECK-LABEL: @or_cmps_eq_zero_with_mask_commute1(
; CHECK-NEXT:    [[ISNULL:%.*]] = icmp eq i64 %x, 0
; CHECK-NEXT:    [[SOMEBITS:%.*]] = and i64 %x, %y
; CHECK-NEXT:    [[SOMEBITS_ARE_ZERO:%.*]] = icmp eq i64 [[SOMEBITS]], 0
; CHECK-NEXT:    [[R:%.*]] = or i1 [[SOMEBITS_ARE_ZERO]], [[ISNULL]]
; CHECK-NEXT:    ret i1 [[R]]
;
  %isnull = icmp eq i64 %x, 0
  %somebits = and i64 %x, %y
  %somebits_are_zero = icmp eq i64 %somebits, 0
  %r = or i1 %somebits_are_zero, %isnull
  ret i1 %r
}

; or (icmp eq X, 0), (icmp eq (and X, ?), 0) --> icmp eq (and X, ?), 0

define <2 x i1> @or_cmps_eq_zero_with_mask_commute2(<2 x i64> %x, <2 x i64> %y) {
; CHECK-LABEL: @or_cmps_eq_zero_with_mask_commute2(
; CHECK-NEXT:    [[ISNULL:%.*]] = icmp eq <2 x i64> %x, zeroinitializer
; CHECK-NEXT:    [[SOMEBITS:%.*]] = and <2 x i64> %x, %y
; CHECK-NEXT:    [[SOMEBITS_ARE_ZERO:%.*]] = icmp eq <2 x i64> [[SOMEBITS]], zeroinitializer
; CHECK-NEXT:    [[R:%.*]] = or <2 x i1> [[ISNULL]], [[SOMEBITS_ARE_ZERO]]
; CHECK-NEXT:    ret <2 x i1> [[R]]
;
  %isnull = icmp eq <2 x i64> %x, zeroinitializer
  %somebits = and <2 x i64> %x, %y
  %somebits_are_zero = icmp eq <2 x i64> %somebits, zeroinitializer
  %r = or <2 x i1> %isnull, %somebits_are_zero
  ret <2 x i1> %r
}

; or (icmp eq (and ?, X), 0), (icmp eq X, 0) --> icmp eq (and ?, X), 0

define i1 @or_cmps_eq_zero_with_mask_commute3(i4 %x, i4 %y) {
; CHECK-LABEL: @or_cmps_eq_zero_with_mask_commute3(
; CHECK-NEXT:    [[ISNULL:%.*]] = icmp eq i4 %x, 0
; CHECK-NEXT:    [[SOMEBITS:%.*]] = and i4 %y, %x
; CHECK-NEXT:    [[SOMEBITS_ARE_ZERO:%.*]] = icmp eq i4 [[SOMEBITS]], 0
; CHECK-NEXT:    [[R:%.*]] = or i1 [[SOMEBITS_ARE_ZERO]], [[ISNULL]]
; CHECK-NEXT:    ret i1 [[R]]
;
  %isnull = icmp eq i4 %x, 0
  %somebits = and i4 %y, %x
  %somebits_are_zero = icmp eq i4 %somebits, 0
  %r = or i1 %somebits_are_zero, %isnull
  ret i1 %r
}

; or (icmp eq X, 0), (icmp eq (and ?, X), 0) --> icmp eq (and ?, X), 0

define <2 x i1> @or_cmps_eq_zero_with_mask_commute4(<2 x i4> %x, <2 x i4> %y) {
; CHECK-LABEL: @or_cmps_eq_zero_with_mask_commute4(
; CHECK-NEXT:    [[ISNULL:%.*]] = icmp eq <2 x i4> %x, zeroinitializer
; CHECK-NEXT:    [[SOMEBITS:%.*]] = and <2 x i4> %y, %x
; CHECK-NEXT:    [[SOMEBITS_ARE_ZERO:%.*]] = icmp eq <2 x i4> [[SOMEBITS]], zeroinitializer
; CHECK-NEXT:    [[R:%.*]] = or <2 x i1> [[ISNULL]], [[SOMEBITS_ARE_ZERO]]
; CHECK-NEXT:    ret <2 x i1> [[R]]
;
  %isnull = icmp eq <2 x i4> %x, zeroinitializer
  %somebits = and <2 x i4> %y, %x
  %somebits_are_zero = icmp eq <2 x i4> %somebits, zeroinitializer
  %r = or <2 x i1> %isnull, %somebits_are_zero
  ret <2 x i1> %r
}

; and (icmp ne (and X, ?), 0), (icmp ne X, 0) --> icmp ne (and X, ?), 0

define <3 x i1> @and_cmps_eq_zero_with_mask_commute1(<3 x i4> %x, <3 x i4> %y) {
; CHECK-LABEL: @and_cmps_eq_zero_with_mask_commute1(
; CHECK-NEXT:    [[ISNOTNULL:%.*]] = icmp ne <3 x i4> %x, zeroinitializer
; CHECK-NEXT:    [[SOMEBITS:%.*]] = and <3 x i4> %x, %y
; CHECK-NEXT:    [[SOMEBITS_ARE_NOT_ZERO:%.*]] = icmp ne <3 x i4> [[SOMEBITS]], zeroinitializer
; CHECK-NEXT:    [[R:%.*]] = and <3 x i1> [[SOMEBITS_ARE_NOT_ZERO]], [[ISNOTNULL]]
; CHECK-NEXT:    ret <3 x i1> [[R]]
;
  %isnotnull = icmp ne <3 x i4> %x, zeroinitializer
  %somebits = and <3 x i4> %x, %y
  %somebits_are_not_zero = icmp ne <3 x i4> %somebits, zeroinitializer
  %r = and <3 x i1> %somebits_are_not_zero, %isnotnull
  ret <3 x i1> %r
}

; and (icmp ne X, 0), (icmp ne (and X, ?), 0) --> icmp ne (and X, ?), 0

define i1 @and_cmps_eq_zero_with_mask_commute2(i4 %x, i4 %y) {
; CHECK-LABEL: @and_cmps_eq_zero_with_mask_commute2(
; CHECK-NEXT:    [[ISNOTNULL:%.*]] = icmp ne i4 %x, 0
; CHECK-NEXT:    [[SOMEBITS:%.*]] = and i4 %x, %y
; CHECK-NEXT:    [[SOMEBITS_ARE_NOT_ZERO:%.*]] = icmp ne i4 [[SOMEBITS]], 0
; CHECK-NEXT:    [[R:%.*]] = and i1 [[ISNOTNULL]], [[SOMEBITS_ARE_NOT_ZERO]]
; CHECK-NEXT:    ret i1 [[R]]
;
  %isnotnull = icmp ne i4 %x, 0
  %somebits = and i4 %x, %y
  %somebits_are_not_zero = icmp ne i4 %somebits, 0
  %r = and i1 %isnotnull, %somebits_are_not_zero
  ret i1 %r
}

; and (icmp ne (and ?, X), 0), (icmp ne X, 0) --> icmp ne (and ?, X), 0

define <3 x i1> @and_cmps_eq_zero_with_mask_commute3(<3 x i64> %x, <3 x i64> %y) {
; CHECK-LABEL: @and_cmps_eq_zero_with_mask_commute3(
; CHECK-NEXT:    [[ISNOTNULL:%.*]] = icmp ne <3 x i64> %x, zeroinitializer
; CHECK-NEXT:    [[SOMEBITS:%.*]] = and <3 x i64> %y, %x
; CHECK-NEXT:    [[SOMEBITS_ARE_NOT_ZERO:%.*]] = icmp ne <3 x i64> [[SOMEBITS]], zeroinitializer
; CHECK-NEXT:    [[R:%.*]] = and <3 x i1> [[SOMEBITS_ARE_NOT_ZERO]], [[ISNOTNULL]]
; CHECK-NEXT:    ret <3 x i1> [[R]]
;
  %isnotnull = icmp ne <3 x i64> %x, zeroinitializer
  %somebits = and <3 x i64> %y, %x
  %somebits_are_not_zero = icmp ne <3 x i64> %somebits, zeroinitializer
  %r = and <3 x i1> %somebits_are_not_zero, %isnotnull
  ret <3 x i1> %r
}

; and (icmp ne X, 0), (icmp ne (and ?, X), 0) --> icmp ne (and ?, X), 0

define i1 @and_cmps_eq_zero_with_mask_commute4(i64 %x, i64 %y) {
; CHECK-LABEL: @and_cmps_eq_zero_with_mask_commute4(
; CHECK-NEXT:    [[ISNOTNULL:%.*]] = icmp ne i64 %x, 0
; CHECK-NEXT:    [[SOMEBITS:%.*]] = and i64 %y, %x
; CHECK-NEXT:    [[SOMEBITS_ARE_NOT_ZERO:%.*]] = icmp ne i64 [[SOMEBITS]], 0
; CHECK-NEXT:    [[R:%.*]] = and i1 [[ISNOTNULL]], [[SOMEBITS_ARE_NOT_ZERO]]
; CHECK-NEXT:    ret i1 [[R]]
;
  %isnotnull = icmp ne i64 %x, 0
  %somebits = and i64 %y, %x
  %somebits_are_not_zero = icmp ne i64 %somebits, 0
  %r = and i1 %isnotnull, %somebits_are_not_zero
  ret i1 %r
}