llvm-project/llvm/test/Transforms/EarlyCSE/commute.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -S -early-cse -earlycse-debug-hash | FileCheck %s
; RUN: opt < %s -S -basicaa -early-cse-memssa | FileCheck %s

define void @test1(float %A, float %B, float* %PA, float* %PB) {
; CHECK-LABEL: @test1(
; CHECK-NEXT:    [[C:%.*]] = fadd float [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    store float [[C]], float* [[PA:%.*]]
; CHECK-NEXT:    store float [[C]], float* [[PB:%.*]]
; CHECK-NEXT:    ret void
;
  %C = fadd float %A, %B
  store float %C, float* %PA
  %D = fadd float %B, %A
  store float %D, float* %PB
  ret void
}

define void @test2(float %A, float %B, i1* %PA, i1* %PB) {
; CHECK-LABEL: @test2(
; CHECK-NEXT:    [[C:%.*]] = fcmp oeq float [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    store i1 [[C]], i1* [[PA:%.*]]
; CHECK-NEXT:    store i1 [[C]], i1* [[PB:%.*]]
; CHECK-NEXT:    ret void
;
  %C = fcmp oeq float %A, %B
  store i1 %C, i1* %PA
  %D = fcmp oeq float %B, %A
  store i1 %D, i1* %PB
  ret void
}

define void @test3(float %A, float %B, i1* %PA, i1* %PB) {
; CHECK-LABEL: @test3(
; CHECK-NEXT:    [[C:%.*]] = fcmp uge float [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    store i1 [[C]], i1* [[PA:%.*]]
; CHECK-NEXT:    store i1 [[C]], i1* [[PB:%.*]]
; CHECK-NEXT:    ret void
;
  %C = fcmp uge float %A, %B
  store i1 %C, i1* %PA
  %D = fcmp ule float %B, %A
  store i1 %D, i1* %PB
  ret void
}

define void @test4(i32 %A, i32 %B, i1* %PA, i1* %PB) {
; CHECK-LABEL: @test4(
; CHECK-NEXT:    [[C:%.*]] = icmp eq i32 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    store i1 [[C]], i1* [[PA:%.*]]
; CHECK-NEXT:    store i1 [[C]], i1* [[PB:%.*]]
; CHECK-NEXT:    ret void
;
  %C = icmp eq i32 %A, %B
  store i1 %C, i1* %PA
  %D = icmp eq i32 %B, %A
  store i1 %D, i1* %PB
  ret void
}

define void @test5(i32 %A, i32 %B, i1* %PA, i1* %PB) {
; CHECK-LABEL: @test5(
; CHECK-NEXT:    [[C:%.*]] = icmp sgt i32 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    store i1 [[C]], i1* [[PA:%.*]]
; CHECK-NEXT:    store i1 [[C]], i1* [[PB:%.*]]
; CHECK-NEXT:    ret void
;
  %C = icmp sgt i32 %A, %B
  store i1 %C, i1* %PA
  %D = icmp slt i32 %B, %A
  store i1 %D, i1* %PB
  ret void
}

; Test degenerate case of commuted compare of identical comparands.

define void @test6(float %f, i1* %p1, i1* %p2) {
; CHECK-LABEL: @test6(
; CHECK-NEXT:    [[C1:%.*]] = fcmp ult float [[F:%.*]], [[F]]
; CHECK-NEXT:    store i1 [[C1]], i1* [[P1:%.*]]
; CHECK-NEXT:    store i1 [[C1]], i1* [[P2:%.*]]
; CHECK-NEXT:    ret void
;
  %c1 = fcmp ult float %f, %f
  %c2 = fcmp ugt float %f, %f
  store i1 %c1, i1* %p1
  store i1 %c2, i1* %p2
  ret void
}

; Min/max operands may be commuted in the compare and select.

define i8 @smin_commute(i8 %a, i8 %b) {
; CHECK-LABEL: @smin_commute(
; CHECK-NEXT:    [[CMP1:%.*]] = icmp slt i8 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    [[CMP2:%.*]] = icmp slt i8 [[B]], [[A]]
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[B]]
; CHECK-NEXT:    [[R:%.*]] = mul i8 [[M1]], [[M1]]
; CHECK-NEXT:    ret i8 [[R]]
;
  %cmp1 = icmp slt i8 %a, %b
  %cmp2 = icmp slt i8 %b, %a
  %m1 = select i1 %cmp1, i8 %a, i8 %b
  %m2 = select i1 %cmp2, i8 %b, i8 %a
  %r = mul i8 %m1, %m2
  ret i8 %r
}

; Min/max can also have a swapped predicate and select operands.

define i1 @smin_swapped(i8 %a, i8 %b) {
; CHECK-LABEL: @smin_swapped(
; CHECK-NEXT:    [[CMP1:%.*]] = icmp sgt i8 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    [[CMP2:%.*]] = icmp slt i8 [[A]], [[B]]
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[CMP1]], i8 [[B]], i8 [[A]]
; CHECK-NEXT:    ret i1 true
;
  %cmp1 = icmp sgt i8 %a, %b
  %cmp2 = icmp slt i8 %a, %b
  %m1 = select i1 %cmp1, i8 %b, i8 %a
  %m2 = select i1 %cmp2, i8 %a, i8 %b
  %r = icmp eq i8 %m2, %m1
  ret i1 %r
}

; Min/max can also have an inverted predicate and select operands.

define i1 @smin_inverted(i8 %a, i8 %b) {
; CHECK-LABEL: @smin_inverted(
; CHECK-NEXT:    [[CMP1:%.*]] = icmp slt i8 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    [[CMP2:%.*]] = xor i1 [[CMP1]], true
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[B]]
; CHECK-NEXT:    ret i1 true
;
  %cmp1 = icmp slt i8 %a, %b
  %cmp2 = xor i1 %cmp1, -1
  %m1 = select i1 %cmp1, i8 %a, i8 %b
  %m2 = select i1 %cmp2, i8 %b, i8 %a
  %r = icmp eq i8 %m1, %m2
  ret i1 %r
}

define i8 @smax_commute(i8 %a, i8 %b) {
; CHECK-LABEL: @smax_commute(
; CHECK-NEXT:    [[CMP1:%.*]] = icmp sgt i8 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    [[CMP2:%.*]] = icmp sgt i8 [[B]], [[A]]
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[B]]
; CHECK-NEXT:    ret i8 0
;
  %cmp1 = icmp sgt i8 %a, %b
  %cmp2 = icmp sgt i8 %b, %a
  %m1 = select i1 %cmp1, i8 %a, i8 %b
  %m2 = select i1 %cmp2, i8 %b, i8 %a
  %r = urem i8 %m2, %m1
  ret i8 %r
}

define i8 @smax_swapped(i8 %a, i8 %b) {
; CHECK-LABEL: @smax_swapped(
; CHECK-NEXT:    [[CMP1:%.*]] = icmp slt i8 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    [[CMP2:%.*]] = icmp sgt i8 [[A]], [[B]]
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[CMP1]], i8 [[B]], i8 [[A]]
; CHECK-NEXT:    ret i8 1
;
  %cmp1 = icmp slt i8 %a, %b
  %cmp2 = icmp sgt i8 %a, %b
  %m1 = select i1 %cmp1, i8 %b, i8 %a
  %m2 = select i1 %cmp2, i8 %a, i8 %b
  %r = sdiv i8 %m1, %m2
  ret i8 %r
}

define i1 @smax_inverted(i8 %a, i8 %b) {
; CHECK-LABEL: @smax_inverted(
; CHECK-NEXT:    [[CMP1:%.*]] = icmp sgt i8 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    [[CMP2:%.*]] = xor i1 [[CMP1]], true
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[B]]
; CHECK-NEXT:    ret i1 true
;
  %cmp1 = icmp sgt i8 %a, %b
  %cmp2 = xor i1 %cmp1, -1
  %m1 = select i1 %cmp1, i8 %a, i8 %b
  %m2 = select i1 %cmp2, i8 %b, i8 %a
  %r = icmp eq i8 %m1, %m2
  ret i1 %r
}

define i8 @umin_commute(i8 %a, i8 %b) {
; CHECK-LABEL: @umin_commute(
; CHECK-NEXT:    [[CMP1:%.*]] = icmp ult i8 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    [[CMP2:%.*]] = icmp ult i8 [[B]], [[A]]
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[B]]
; CHECK-NEXT:    ret i8 0
;
  %cmp1 = icmp ult i8 %a, %b
  %cmp2 = icmp ult i8 %b, %a
  %m1 = select i1 %cmp1, i8 %a, i8 %b
  %m2 = select i1 %cmp2, i8 %b, i8 %a
  %r = sub i8 %m2, %m1
  ret i8 %r
}

; Choose a vector type just to show that works.

define <2 x i8> @umin_swapped(<2 x i8> %a, <2 x i8> %b) {
; CHECK-LABEL: @umin_swapped(
; CHECK-NEXT:    [[CMP1:%.*]] = icmp ugt <2 x i8> [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    [[CMP2:%.*]] = icmp ult <2 x i8> [[A]], [[B]]
; CHECK-NEXT:    [[M1:%.*]] = select <2 x i1> [[CMP1]], <2 x i8> [[B]], <2 x i8> [[A]]
; CHECK-NEXT:    ret <2 x i8> zeroinitializer
;
  %cmp1 = icmp ugt <2 x i8> %a, %b
  %cmp2 = icmp ult <2 x i8> %a, %b
  %m1 = select <2 x i1> %cmp1, <2 x i8> %b, <2 x i8> %a
  %m2 = select <2 x i1> %cmp2, <2 x i8> %a, <2 x i8> %b
  %r = sub <2 x i8> %m2, %m1
  ret <2 x i8> %r
}

define i1 @umin_inverted(i8 %a, i8 %b) {
; CHECK-LABEL: @umin_inverted(
; CHECK-NEXT:    [[CMP1:%.*]] = icmp ult i8 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    [[CMP2:%.*]] = xor i1 [[CMP1]], true
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[B]]
; CHECK-NEXT:    ret i1 true
;
  %cmp1 = icmp ult i8 %a, %b
  %cmp2 = xor i1 %cmp1, -1
  %m1 = select i1 %cmp1, i8 %a, i8 %b
  %m2 = select i1 %cmp2, i8 %b, i8 %a
  %r = icmp eq i8 %m1, %m2
  ret i1 %r
}

define i8 @umax_commute(i8 %a, i8 %b) {
; CHECK-LABEL: @umax_commute(
; CHECK-NEXT:    [[CMP1:%.*]] = icmp ugt i8 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    [[CMP2:%.*]] = icmp ugt i8 [[B]], [[A]]
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[B]]
; CHECK-NEXT:    ret i8 1
;
  %cmp1 = icmp ugt i8 %a, %b
  %cmp2 = icmp ugt i8 %b, %a
  %m1 = select i1 %cmp1, i8 %a, i8 %b
  %m2 = select i1 %cmp2, i8 %b, i8 %a
  %r = udiv i8 %m1, %m2
  ret i8 %r
}

define i8 @umax_swapped(i8 %a, i8 %b) {
; CHECK-LABEL: @umax_swapped(
; CHECK-NEXT:    [[CMP1:%.*]] = icmp ult i8 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    [[CMP2:%.*]] = icmp ugt i8 [[A]], [[B]]
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[CMP1]], i8 [[B]], i8 [[A]]
; CHECK-NEXT:    [[R:%.*]] = add i8 [[M1]], [[M1]]
; CHECK-NEXT:    ret i8 [[R]]
;
  %cmp1 = icmp ult i8 %a, %b
  %cmp2 = icmp ugt i8 %a, %b
  %m1 = select i1 %cmp1, i8 %b, i8 %a
  %m2 = select i1 %cmp2, i8 %a, i8 %b
  %r = add i8 %m2, %m1
  ret i8 %r
}

define i1 @umax_inverted(i8 %a, i8 %b) {
; CHECK-LABEL: @umax_inverted(
; CHECK-NEXT:    [[CMP1:%.*]] = icmp ugt i8 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    [[CMP2:%.*]] = xor i1 [[CMP1]], true
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[B]]
; CHECK-NEXT:    ret i1 true
;
  %cmp1 = icmp ugt i8 %a, %b
  %cmp2 = xor i1 %cmp1, -1
  %m1 = select i1 %cmp1, i8 %a, i8 %b
  %m2 = select i1 %cmp2, i8 %b, i8 %a
  %r = icmp eq i8 %m1, %m2
  ret i1 %r
}

; Min/max may exist with non-canonical operands. Value tracking can match those.
; But we do not use value tracking, so we expect instcombine will canonicalize
; this code to a form that allows CSE.

define i8 @smax_nsw(i8 %a, i8 %b) {
; CHECK-LABEL: @smax_nsw(
; CHECK-NEXT:    [[SUB:%.*]] = sub nsw i8 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    [[CMP1:%.*]] = icmp slt i8 [[A]], [[B]]
; CHECK-NEXT:    [[CMP2:%.*]] = icmp sgt i8 [[SUB]], 0
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[CMP1]], i8 0, i8 [[SUB]]
; CHECK-NEXT:    [[M2:%.*]] = select i1 [[CMP2]], i8 [[SUB]], i8 0
; CHECK-NEXT:    [[R:%.*]] = sub i8 [[M2]], [[M1]]
; CHECK-NEXT:    ret i8 [[R]]
;
  %sub = sub nsw i8 %a, %b
  %cmp1 = icmp slt i8 %a, %b
  %cmp2 = icmp sgt i8 %sub, 0
  %m1 = select i1 %cmp1, i8 0, i8 %sub
  %m2 = select i1 %cmp2, i8 %sub, i8 0
  %r = sub i8 %m2, %m1
  ret i8 %r
}

; Abs/nabs may exist with non-canonical operands. Value tracking can match those.
; But we do not use value tracking, so we expect instcombine will canonicalize
; this code to a form that allows CSE.

define i8 @abs_swapped(i8 %a) {
; CHECK-LABEL: @abs_swapped(
; CHECK-NEXT:    [[NEG:%.*]] = sub i8 0, [[A:%.*]]
; CHECK-NEXT:    [[CMP1:%.*]] = icmp sgt i8 [[A]], 0
; CHECK-NEXT:    [[CMP2:%.*]] = icmp slt i8 [[A]], 0
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[NEG]]
; CHECK-NEXT:    [[M2:%.*]] = select i1 [[CMP2]], i8 [[NEG]], i8 [[A]]
; CHECK-NEXT:    [[R:%.*]] = or i8 [[M2]], [[M1]]
; CHECK-NEXT:    ret i8 [[R]]
;
  %neg = sub i8 0, %a
  %cmp1 = icmp sgt i8 %a, 0
  %cmp2 = icmp slt i8 %a, 0
  %m1 = select i1 %cmp1, i8 %a, i8 %neg
  %m2 = select i1 %cmp2, i8 %neg, i8 %a
  %r = or i8 %m2, %m1
  ret i8 %r
}

define i8 @abs_inverted(i8 %a) {
; CHECK-LABEL: @abs_inverted(
; CHECK-NEXT:    [[NEG:%.*]] = sub i8 0, [[A:%.*]]
; CHECK-NEXT:    [[CMP1:%.*]] = icmp sgt i8 [[A]], 0
; CHECK-NEXT:    [[CMP2:%.*]] = xor i1 [[CMP1]], true
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[NEG]]
; CHECK-NEXT:    ret i8 [[M1]]
;
  %neg = sub i8 0, %a
  %cmp1 = icmp sgt i8 %a, 0
  %cmp2 = xor i1 %cmp1, -1
  %m1 = select i1 %cmp1, i8 %a, i8 %neg
  %m2 = select i1 %cmp2, i8 %neg, i8 %a
  %r = or i8 %m2, %m1
  ret i8 %r
}

; Abs/nabs may exist with non-canonical operands. Value tracking can match those.
; But we do not use value tracking, so we expect instcombine will canonicalize
; this code to a form that allows CSE.

define i8 @nabs_swapped(i8 %a) {
; CHECK-LABEL: @nabs_swapped(
; CHECK-NEXT:    [[NEG:%.*]] = sub i8 0, [[A:%.*]]
; CHECK-NEXT:    [[CMP1:%.*]] = icmp slt i8 [[A]], 0
; CHECK-NEXT:    [[CMP2:%.*]] = icmp sgt i8 [[A]], 0
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[NEG]]
; CHECK-NEXT:    [[M2:%.*]] = select i1 [[CMP2]], i8 [[NEG]], i8 [[A]]
; CHECK-NEXT:    [[R:%.*]] = xor i8 [[M2]], [[M1]]
; CHECK-NEXT:    ret i8 [[R]]
;
  %neg = sub i8 0, %a
  %cmp1 = icmp slt i8 %a, 0
  %cmp2 = icmp sgt i8 %a, 0
  %m1 = select i1 %cmp1, i8 %a, i8 %neg
  %m2 = select i1 %cmp2, i8 %neg, i8 %a
  %r = xor i8 %m2, %m1
  ret i8 %r
}

define i8 @nabs_inverted(i8 %a) {
; CHECK-LABEL: @nabs_inverted(
; CHECK-NEXT:    [[NEG:%.*]] = sub i8 0, [[A:%.*]]
; CHECK-NEXT:    [[CMP1:%.*]] = icmp slt i8 [[A]], 0
; CHECK-NEXT:    [[CMP2:%.*]] = xor i1 [[CMP1]], true
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[NEG]]
; CHECK-NEXT:    ret i8 0
;
  %neg = sub i8 0, %a
  %cmp1 = icmp slt i8 %a, 0
  %cmp2 = xor i1 %cmp1, -1
  %m1 = select i1 %cmp1, i8 %a, i8 %neg
  %m2 = select i1 %cmp2, i8 %neg, i8 %a
  %r = xor i8 %m2, %m1
  ret i8 %r
}

; Abs/nabs may exist with non-canonical operands. Value tracking can match those.
; But we do not use value tracking, so we expect instcombine will canonicalize
; this code to a form that allows CSE.

; compares are different.
define i8 @abs_different_constants(i8 %a) {
; CHECK-LABEL: @abs_different_constants(
; CHECK-NEXT:    [[NEG:%.*]] = sub i8 0, [[A:%.*]]
; CHECK-NEXT:    [[CMP1:%.*]] = icmp sgt i8 [[A]], -1
; CHECK-NEXT:    [[CMP2:%.*]] = icmp slt i8 [[A]], 0
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[NEG]]
; CHECK-NEXT:    [[M2:%.*]] = select i1 [[CMP2]], i8 [[NEG]], i8 [[A]]
; CHECK-NEXT:    [[R:%.*]] = or i8 [[M2]], [[M1]]
; CHECK-NEXT:    ret i8 [[R]]
;
  %neg = sub i8 0, %a
  %cmp1 = icmp sgt i8 %a, -1
  %cmp2 = icmp slt i8 %a, 0
  %m1 = select i1 %cmp1, i8 %a, i8 %neg
  %m2 = select i1 %cmp2, i8 %neg, i8 %a
  %r = or i8 %m2, %m1
  ret i8 %r
}

; Abs/nabs may exist with non-canonical operands. Value tracking can match those.
; But we do not use value tracking, so we expect instcombine will canonicalize
; this code to a form that allows CSE.

define i8 @nabs_different_constants(i8 %a) {
; CHECK-LABEL: @nabs_different_constants(
; CHECK-NEXT:    [[NEG:%.*]] = sub i8 0, [[A:%.*]]
; CHECK-NEXT:    [[CMP1:%.*]] = icmp slt i8 [[A]], 0
; CHECK-NEXT:    [[CMP2:%.*]] = icmp sgt i8 [[A]], -1
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[CMP1]], i8 [[A]], i8 [[NEG]]
; CHECK-NEXT:    [[M2:%.*]] = select i1 [[CMP2]], i8 [[NEG]], i8 [[A]]
; CHECK-NEXT:    [[R:%.*]] = xor i8 [[M2]], [[M1]]
; CHECK-NEXT:    ret i8 [[R]]
;
  %neg = sub i8 0, %a
  %cmp1 = icmp slt i8 %a, 0
  %cmp2 = icmp sgt i8 %a, -1
  %m1 = select i1 %cmp1, i8 %a, i8 %neg
  %m2 = select i1 %cmp2, i8 %neg, i8 %a
  %r = xor i8 %m2, %m1
  ret i8 %r
}

; https://bugs.llvm.org/show_bug.cgi?id=41101
; Detect equivalence of selects with commuted operands: 'not' cond.

define i32 @select_not_cond(i1 %cond, i32 %t, i32 %f) {
; CHECK-LABEL: @select_not_cond(
; CHECK-NEXT:    [[NOT:%.*]] = xor i1 [[COND:%.*]], true
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[COND]], i32 [[T:%.*]], i32 [[F:%.*]]
; CHECK-NEXT:    ret i32 0
;
  %not = xor i1 %cond, -1
  %m1 = select i1 %cond, i32 %t, i32 %f
  %m2 = select i1 %not, i32 %f, i32 %t
  %r = xor i32 %m2, %m1
  ret i32 %r
}

; Detect equivalence of selects with commuted operands: 'not' cond with vector select.

define <2 x double> @select_not_cond_commute_vec(<2 x i1> %cond, <2 x double> %t, <2 x double> %f) {
; CHECK-LABEL: @select_not_cond_commute_vec(
; CHECK-NEXT:    [[NOT:%.*]] = xor <2 x i1> [[COND:%.*]], <i1 true, i1 true>
; CHECK-NEXT:    [[M1:%.*]] = select <2 x i1> [[COND]], <2 x double> [[T:%.*]], <2 x double> [[F:%.*]]
; CHECK-NEXT:    ret <2 x double> <double 1.000000e+00, double 1.000000e+00>
;
  %not = xor <2 x i1> %cond, <i1 -1, i1 -1>
  %m1 = select <2 x i1> %cond, <2 x double> %t, <2 x double> %f
  %m2 = select <2 x i1> %not, <2 x double> %f, <2 x double> %t
  %r = fdiv nnan <2 x double> %m1, %m2
  ret <2 x double> %r
}

; Negative test - select ops must be commuted.

define i32 @select_not_cond_wrong_select_ops(i1 %cond, i32 %t, i32 %f) {
; CHECK-LABEL: @select_not_cond_wrong_select_ops(
; CHECK-NEXT:    [[NOT:%.*]] = xor i1 [[COND:%.*]], true
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[COND]], i32 [[T:%.*]], i32 [[F:%.*]]
; CHECK-NEXT:    [[M2:%.*]] = select i1 [[NOT]], i32 [[T]], i32 [[F]]
; CHECK-NEXT:    [[R:%.*]] = xor i32 [[M2]], [[M1]]
; CHECK-NEXT:    ret i32 [[R]]
;
  %not = xor i1 %cond, -1
  %m1 = select i1 %cond, i32 %t, i32 %f
  %m2 = select i1 %not, i32 %t, i32 %f
  %r = xor i32 %m2, %m1
  ret i32 %r
}

; Negative test - not a 'not'.

define i32 @select_not_cond_wrong_cond(i1 %cond, i32 %t, i32 %f) {
; CHECK-LABEL: @select_not_cond_wrong_cond(
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[COND:%.*]], i32 [[T:%.*]], i32 [[F:%.*]]
; CHECK-NEXT:    [[M2:%.*]] = select i1 [[COND]], i32 [[F]], i32 [[T]]
; CHECK-NEXT:    [[R:%.*]] = xor i32 [[M2]], [[M1]]
; CHECK-NEXT:    ret i32 [[R]]
;
  %not = xor i1 %cond, -2
  %m1 = select i1 %cond, i32 %t, i32 %f
  %m2 = select i1 %not, i32 %f, i32 %t
  %r = xor i32 %m2, %m1
  ret i32 %r
}

; Detect equivalence of selects with commuted operands: inverted pred with fcmps.

define i32 @select_invert_pred_cond(float %x, i32 %t, i32 %f) {
; CHECK-LABEL: @select_invert_pred_cond(
; CHECK-NEXT:    [[COND:%.*]] = fcmp ueq float [[X:%.*]], 4.200000e+01
; CHECK-NEXT:    [[INVCOND:%.*]] = fcmp one float [[X]], 4.200000e+01
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[COND]], i32 [[T:%.*]], i32 [[F:%.*]]
; CHECK-NEXT:    ret i32 0
;
  %cond = fcmp ueq float %x, 42.0
  %invcond = fcmp one float %x, 42.0
  %m1 = select i1 %cond, i32 %t, i32 %f
  %m2 = select i1 %invcond, i32 %f, i32 %t
  %r = xor i32 %m2, %m1
  ret i32 %r
}

; Detect equivalence of selects with commuted operands: inverted pred with icmps and vectors.

define <2 x i32> @select_invert_pred_cond_commute_vec(<2 x i8> %x, <2 x i32> %t, <2 x i32> %f) {
; CHECK-LABEL: @select_invert_pred_cond_commute_vec(
; CHECK-NEXT:    [[COND:%.*]] = icmp sgt <2 x i8> [[X:%.*]], <i8 42, i8 -1>
; CHECK-NEXT:    [[INVCOND:%.*]] = icmp sle <2 x i8> [[X]], <i8 42, i8 -1>
; CHECK-NEXT:    [[M1:%.*]] = select <2 x i1> [[COND]], <2 x i32> [[T:%.*]], <2 x i32> [[F:%.*]]
; CHECK-NEXT:    ret <2 x i32> zeroinitializer
;
  %cond = icmp sgt <2 x i8> %x, <i8 42, i8 -1>
  %invcond = icmp sle <2 x i8> %x, <i8 42, i8 -1>
  %m1 = select <2 x i1> %cond, <2 x i32> %t, <2 x i32> %f
  %m2 = select <2 x i1> %invcond, <2 x i32> %f, <2 x i32> %t
  %r = xor <2 x i32> %m1, %m2
  ret <2 x i32> %r
}

; Negative test - select ops must be commuted.

define i32 @select_invert_pred_wrong_select_ops(float %x, i32 %t, i32 %f) {
; CHECK-LABEL: @select_invert_pred_wrong_select_ops(
; CHECK-NEXT:    [[COND:%.*]] = fcmp ueq float [[X:%.*]], 4.200000e+01
; CHECK-NEXT:    [[INVCOND:%.*]] = fcmp one float [[X]], 4.200000e+01
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[COND]], i32 [[F:%.*]], i32 [[T:%.*]]
; CHECK-NEXT:    [[M2:%.*]] = select i1 [[INVCOND]], i32 [[F]], i32 [[T]]
; CHECK-NEXT:    [[R:%.*]] = xor i32 [[M2]], [[M1]]
; CHECK-NEXT:    ret i32 [[R]]
;
  %cond = fcmp ueq float %x, 42.0
  %invcond = fcmp one float %x, 42.0
  %m1 = select i1 %cond, i32 %f, i32 %t
  %m2 = select i1 %invcond, i32 %f, i32 %t
  %r = xor i32 %m2, %m1
  ret i32 %r
}

; Negative test - not an inverted predicate.

define i32 @select_invert_pred_wrong_cond(float %x, i32 %t, i32 %f) {
; CHECK-LABEL: @select_invert_pred_wrong_cond(
; CHECK-NEXT:    [[COND:%.*]] = fcmp ueq float [[X:%.*]], 4.200000e+01
; CHECK-NEXT:    [[INVCOND:%.*]] = fcmp une float [[X]], 4.200000e+01
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[COND]], i32 [[T:%.*]], i32 [[F:%.*]]
; CHECK-NEXT:    [[M2:%.*]] = select i1 [[INVCOND]], i32 [[F]], i32 [[T]]
; CHECK-NEXT:    [[R:%.*]] = xor i32 [[M2]], [[M1]]
; CHECK-NEXT:    ret i32 [[R]]
;
  %cond = fcmp ueq float %x, 42.0
  %invcond = fcmp une float %x, 42.0
  %m1 = select i1 %cond, i32 %t, i32 %f
  %m2 = select i1 %invcond, i32 %f, i32 %t
  %r = xor i32 %m2, %m1
  ret i32 %r
}

; Negative test - cmp ops must match.

define i32 @select_invert_pred_wrong_cmp_ops(float %x, i32 %t, i32 %f) {
; CHECK-LABEL: @select_invert_pred_wrong_cmp_ops(
; CHECK-NEXT:    [[COND:%.*]] = fcmp ueq float [[X:%.*]], 4.200000e+01
; CHECK-NEXT:    [[INVCOND:%.*]] = fcmp one float [[X]], 4.300000e+01
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[COND]], i32 [[T:%.*]], i32 [[F:%.*]]
; CHECK-NEXT:    [[M2:%.*]] = select i1 [[INVCOND]], i32 [[F]], i32 [[T]]
; CHECK-NEXT:    [[R:%.*]] = xor i32 [[M2]], [[M1]]
; CHECK-NEXT:    ret i32 [[R]]
;
  %cond = fcmp ueq float %x, 42.0
  %invcond = fcmp one float %x, 43.0
  %m1 = select i1 %cond, i32 %t, i32 %f
  %m2 = select i1 %invcond, i32 %f, i32 %t
  %r = xor i32 %m2, %m1
  ret i32 %r
}

; If we have both an inverted predicate and a 'not' op, recognize the double-negation.

define i32 @select_not_invert_pred_cond(i8 %x, i32 %t, i32 %f) {
; CHECK-LABEL: @select_not_invert_pred_cond(
; CHECK-NEXT:    [[COND:%.*]] = icmp ugt i8 [[X:%.*]], 42
; CHECK-NEXT:    [[INVCOND:%.*]] = icmp ule i8 [[X]], 42
; CHECK-NEXT:    [[NOT:%.*]] = xor i1 [[INVCOND]], true
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[COND]], i32 [[T:%.*]], i32 [[F:%.*]]
; CHECK-NEXT:    ret i32 0
;
  %cond = icmp ugt i8 %x, 42
  %invcond = icmp ule i8 %x, 42
  %not = xor i1 %invcond, -1
  %m1 = select i1 %cond, i32 %t, i32 %f
  %m2 = select i1 %not, i32 %t, i32 %f
  %r = sub i32 %m1, %m2
  ret i32 %r
}

; If we have both an inverted predicate and a 'not' op, recognize the double-negation.

define i32 @select_not_invert_pred_cond_commute(i8 %x, i8 %y, i32 %t, i32 %f) {
; CHECK-LABEL: @select_not_invert_pred_cond_commute(
; CHECK-NEXT:    [[INVCOND:%.*]] = icmp ule i8 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT:    [[NOT:%.*]] = xor i1 [[INVCOND]], true
; CHECK-NEXT:    [[M2:%.*]] = select i1 [[NOT]], i32 [[T:%.*]], i32 [[F:%.*]]
; CHECK-NEXT:    [[COND:%.*]] = icmp ugt i8 [[X]], [[Y]]
; CHECK-NEXT:    ret i32 0
;
  %invcond = icmp ule i8 %x, %y
  %not = xor i1 %invcond, -1
  %m2 = select i1 %not, i32 %t, i32 %f
  %cond = icmp ugt i8 %x, %y
  %m1 = select i1 %cond, i32 %t, i32 %f
  %r = sub i32 %m2, %m1
  ret i32 %r
}

; Negative test - not an inverted predicate.

define i32 @select_not_invert_pred_cond_wrong_pred(i8 %x, i8 %y, i32 %t, i32 %f) {
; CHECK-LABEL: @select_not_invert_pred_cond_wrong_pred(
; CHECK-NEXT:    [[INVCOND:%.*]] = icmp ult i8 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT:    [[NOT:%.*]] = xor i1 [[INVCOND]], true
; CHECK-NEXT:    [[M2:%.*]] = select i1 [[NOT]], i32 [[T:%.*]], i32 [[F:%.*]]
; CHECK-NEXT:    [[COND:%.*]] = icmp ugt i8 [[X]], [[Y]]
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[COND]], i32 [[T]], i32 [[F]]
; CHECK-NEXT:    [[R:%.*]] = sub i32 [[M2]], [[M1]]
; CHECK-NEXT:    ret i32 [[R]]
;
  %invcond = icmp ult i8 %x, %y
  %not = xor i1 %invcond, -1
  %m2 = select i1 %not, i32 %t, i32 %f
  %cond = icmp ugt i8 %x, %y
  %m1 = select i1 %cond, i32 %t, i32 %f
  %r = sub i32 %m2, %m1
  ret i32 %r
}

; Negative test - cmp ops must match.

define i32 @select_not_invert_pred_cond_wrong_cmp_op(i8 %x, i8 %y, i32 %t, i32 %f) {
; CHECK-LABEL: @select_not_invert_pred_cond_wrong_cmp_op(
; CHECK-NEXT:    [[INVCOND:%.*]] = icmp ule i8 [[X:%.*]], 42
; CHECK-NEXT:    [[NOT:%.*]] = xor i1 [[INVCOND]], true
; CHECK-NEXT:    [[M2:%.*]] = select i1 [[NOT]], i32 [[T:%.*]], i32 [[F:%.*]]
; CHECK-NEXT:    [[COND:%.*]] = icmp ugt i8 [[X]], [[Y:%.*]]
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[COND]], i32 [[T]], i32 [[F]]
; CHECK-NEXT:    [[R:%.*]] = sub i32 [[M2]], [[M1]]
; CHECK-NEXT:    ret i32 [[R]]
;
  %invcond = icmp ule i8 %x, 42
  %not = xor i1 %invcond, -1
  %m2 = select i1 %not, i32 %t, i32 %f
  %cond = icmp ugt i8 %x, %y
  %m1 = select i1 %cond, i32 %t, i32 %f
  %r = sub i32 %m2, %m1
  ret i32 %r
}

; Negative test - select ops must be same (and not commuted).

define i32 @select_not_invert_pred_cond_wrong_select_op(i8 %x, i8 %y, i32 %t, i32 %f) {
; CHECK-LABEL: @select_not_invert_pred_cond_wrong_select_op(
; CHECK-NEXT:    [[INVCOND:%.*]] = icmp ule i8 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT:    [[NOT:%.*]] = xor i1 [[INVCOND]], true
; CHECK-NEXT:    [[M2:%.*]] = select i1 [[NOT]], i32 [[T:%.*]], i32 [[F:%.*]]
; CHECK-NEXT:    [[COND:%.*]] = icmp ugt i8 [[X]], [[Y]]
; CHECK-NEXT:    [[M1:%.*]] = select i1 [[COND]], i32 [[F]], i32 [[T]]
; CHECK-NEXT:    [[R:%.*]] = sub i32 [[M2]], [[M1]]
; CHECK-NEXT:    ret i32 [[R]]
;
  %invcond = icmp ule i8 %x, %y
  %not = xor i1 %invcond, -1
  %m2 = select i1 %not, i32 %t, i32 %f
  %cond = icmp ugt i8 %x, %y
  %m1 = select i1 %cond, i32 %f, i32 %t
  %r = sub i32 %m2, %m1
  ret i32 %r
}


; This test is a reproducer for a bug involving inverted min/max selects
; hashing differently but comparing as equal.  It exhibits such a pair of
; values, and we run this test with -earlycse-debug-hash which would catch
; the disagreement and fail if it regressed.  This test also includes a
; negation of each negation to check for the same issue one level deeper.
define void @not_not_min(i32* %px, i32* %py, i32* %pout) {
; CHECK-LABEL: @not_not_min(
; CHECK-NEXT:    [[X:%.*]] = load volatile i32, i32* [[PX:%.*]]
; CHECK-NEXT:    [[Y:%.*]] = load volatile i32, i32* [[PY:%.*]]
; CHECK-NEXT:    [[CMPA:%.*]] = icmp slt i32 [[X]], [[Y]]
; CHECK-NEXT:    [[CMPB:%.*]] = xor i1 [[CMPA]], true
; CHECK-NEXT:    [[RA:%.*]] = select i1 [[CMPA]], i32 [[X]], i32 [[Y]]
; CHECK-NEXT:    store volatile i32 [[RA]], i32* [[POUT:%.*]]
; CHECK-NEXT:    store volatile i32 [[RA]], i32* [[POUT]]
; CHECK-NEXT:    store volatile i32 [[RA]], i32* [[POUT]]
; CHECK-NEXT:    ret void
;
  %x = load volatile i32, i32* %px
  %y = load volatile i32, i32* %py
  %cmpa = icmp slt i32 %x, %y
  %cmpb = xor i1 %cmpa, -1
  %cmpc = xor i1 %cmpb, -1
  %ra = select i1 %cmpa, i32 %x, i32 %y
  %rb = select i1 %cmpb, i32 %y, i32 %x
  %rc = select i1 %cmpc, i32 %x, i32 %y
  store volatile i32 %ra, i32* %pout
  store volatile i32 %rb, i32* %pout
  store volatile i32 %rc, i32* %pout

  ret void
}

; This would cause an assert/crash because we matched
; a ValueTracking select pattern that required 'nsw'
; on an operand, but we remove that flag as part of
; CSE matching/hashing.

define void @PR41083_1(i32 %span_left, i32 %clip_left) {
; CHECK-LABEL: @PR41083_1(
; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i32 [[CLIP_LEFT:%.*]], [[SPAN_LEFT:%.*]]
; CHECK-NEXT:    [[SUB:%.*]] = sub i32 [[CLIP_LEFT]], [[SPAN_LEFT]]
; CHECK-NEXT:    [[COND:%.*]] = select i1 [[CMP]], i32 [[SUB]], i32 0
; CHECK-NEXT:    ret void
;
  %cmp = icmp sgt i32 %clip_left, %span_left
  %sub = sub nsw i32 %clip_left, %span_left
  %cond = select i1 %cmp, i32 %sub, i32 0
  %cmp83292 = icmp slt i32 %cond, undef
  %sub2 = sub i32 %clip_left, %span_left
  %sel2 = select i1 %cmp, i32 %sub2, i32 0
  ret void
}

; This would cause an assert/crash because we matched
; a ValueTracking select pattern that required 'nsw'
; on an operand, but we remove that flag as part of
; CSE matching/hashing.

define i32 @PR41083_2(i32 %p) {
; CHECK-LABEL: @PR41083_2(
; CHECK-NEXT:    [[S:%.*]] = sub i32 0, [[P:%.*]]
; CHECK-NEXT:    [[A:%.*]] = ashr exact i32 [[S]], 2
; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i32 0, [[A]]
; CHECK-NEXT:    [[SUB:%.*]] = sub i32 0, [[A]]
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i32 [[SUB]], i32 0
; CHECK-NEXT:    [[M:%.*]] = mul i32 [[SEL]], [[SUB]]
; CHECK-NEXT:    ret i32 [[M]]
;
  %s = sub i32 0, %p
  %a = ashr exact i32 %s, 2
  %cmp = icmp sgt i32 0, %a
  %sub = sub nsw i32 0, %a
  %sel = select i1 %cmp, i32 %sub, i32 0
  %s2 = sub i32 0, %a
  %m = mul i32 %sel, %s2
  ret i32 %m
}