1; RUN: opt < %s -instcombine -S | FileCheck %s
2
3define i32 @test1(i32 %A) {
4; CHECK-LABEL: @test1(
5; CHECK-NEXT:    ret i32 %A
6;
7  %B = xor i32 %A, -1
8  %C = xor i32 %B, -1
9  ret i32 %C
10}
11
12define i1 @invert_icmp(i32 %A, i32 %B) {
13; CHECK-LABEL: @invert_icmp(
14; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt i32 %A, %B
15; CHECK-NEXT:    ret i1 [[CMP]]
16;
17  %cmp = icmp sle i32 %A, %B
18  %not = xor i1 %cmp, true
19  ret i1 %not
20}
21
22; PR1570
23
24define i1 @invert_fcmp(float %X, float %Y) {
25; CHECK-LABEL: @invert_fcmp(
26; CHECK-NEXT:    [[CMP:%.*]] = fcmp uge float %X, %Y
27; CHECK-NEXT:    ret i1 [[CMP]]
28;
29  %cmp = fcmp olt float %X, %Y
30  %not = xor i1 %cmp, true
31  ret i1 %not
32}
33
34; PR2298
35
36define i1 @not_not_cmp(i32 %a, i32 %b) {
37; CHECK-LABEL: @not_not_cmp(
38; CHECK-NEXT:    [[CMP:%.*]] = icmp slt i32 %b, %a
39; CHECK-NEXT:    ret i1 [[CMP]]
40;
41  %nota = xor i32 %a, -1
42  %notb = xor i32 %b, -1
43  %cmp = icmp slt i32 %nota, %notb
44  ret i1 %cmp
45}
46
47define <2 x i1> @not_not_cmp_vector(<2 x i32> %a, <2 x i32> %b) {
48; CHECK-LABEL: @not_not_cmp_vector(
49; CHECK-NEXT:    [[CMP:%.*]] = icmp ugt <2 x i32> %b, %a
50; CHECK-NEXT:    ret <2 x i1> [[CMP]]
51;
52  %nota = xor <2 x i32> %a, <i32 -1, i32 -1>
53  %notb = xor <2 x i32> %b, <i32 -1, i32 -1>
54  %cmp = icmp ugt <2 x i32> %nota, %notb
55  ret <2 x i1> %cmp
56}
57
58define i1 @not_cmp_constant(i32 %a) {
59; CHECK-LABEL: @not_cmp_constant(
60; CHECK-NEXT:    [[CMP:%.*]] = icmp ult i32 %a, -43
61; CHECK-NEXT:    ret i1 [[CMP]]
62;
63  %nota = xor i32 %a, -1
64  %cmp = icmp ugt i32 %nota, 42
65  ret i1 %cmp
66}
67
68define <2 x i1> @not_cmp_constant_vector(<2 x i32> %a) {
69; CHECK-LABEL: @not_cmp_constant_vector(
70; CHECK-NEXT:    [[CMP:%.*]] = icmp sgt <2 x i32> %a, <i32 -43, i32 -43>
71; CHECK-NEXT:    ret <2 x i1> [[CMP]]
72;
73  %nota = xor <2 x i32> %a, <i32 -1, i32 -1>
74  %cmp = icmp slt <2 x i32> %nota, <i32 42, i32 42>
75  ret <2 x i1> %cmp
76}
77
78define <2 x i1> @test7(<2 x i32> %A, <2 x i32> %B) {
79; CHECK-LABEL: @test7(
80; CHECK-NEXT:    [[COND:%.*]] = icmp sgt <2 x i32> %A, %B
81; CHECK-NEXT:    ret <2 x i1> [[COND]]
82;
83  %cond = icmp sle <2 x i32> %A, %B
84  %Ret = xor <2 x i1> %cond, <i1 true, i1 true>
85  ret <2 x i1> %Ret
86}
87
88define i32 @not_ashr_not(i32 %A, i32 %B) {
89; CHECK-LABEL: @not_ashr_not(
90; CHECK-NEXT:    [[NOT2:%.*]] = ashr i32 %A, %B
91; CHECK-NEXT:    ret i32 [[NOT2]]
92;
93  %not1 = xor i32 %A, -1
94  %ashr = ashr i32 %not1, %B
95  %not2 = xor i32 %ashr, -1
96  ret i32 %not2
97}
98
99define i8 @not_ashr_const(i8 %x) {
100; CHECK-LABEL: @not_ashr_const(
101; CHECK-NEXT:    [[NOT:%.*]] = lshr i8 41, %x
102; CHECK-NEXT:    ret i8 [[NOT]]
103;
104  %shr = ashr i8 -42, %x
105  %not = xor i8 %shr, -1
106  ret i8 %not
107}
108
109define <2 x i8> @not_ashr_const_splat(<2 x i8> %x) {
110; CHECK-LABEL: @not_ashr_const_splat(
111; CHECK-NEXT:    [[NOT:%.*]] = lshr <2 x i8> <i8 41, i8 41>, %x
112; CHECK-NEXT:    ret <2 x i8> [[NOT]]
113;
114  %shr = ashr <2 x i8> <i8 -42, i8 -42>, %x
115  %not = xor <2 x i8> %shr, <i8 -1, i8 -1>
116  ret <2 x i8> %not
117}
118
119; We can't get rid of the 'not' on a logical shift of a negative constant.
120
121define i8 @not_lshr_const_negative(i8 %x) {
122; CHECK-LABEL: @not_lshr_const_negative(
123; CHECK-NEXT:    [[SHR:%.*]] = lshr i8 -42, %x
124; CHECK-NEXT:    [[NOT:%.*]] = xor i8 [[SHR]], -1
125; CHECK-NEXT:    ret i8 [[NOT]]
126;
127  %shr = lshr i8 -42, %x
128  %not = xor i8 %shr, -1
129  ret i8 %not
130}
131
132define i8 @not_lshr_const(i8 %x) {
133; CHECK-LABEL: @not_lshr_const(
134; CHECK-NEXT:    [[NOT:%.*]] = ashr i8 -43, %x
135; CHECK-NEXT:    ret i8 [[NOT]]
136;
137  %shr = lshr i8 42, %x
138  %not = xor i8 %shr, -1
139  ret i8 %not
140}
141
142define <2 x i8> @not_lshr_const_splat(<2 x i8> %x) {
143; CHECK-LABEL: @not_lshr_const_splat(
144; CHECK-NEXT:    [[NOT:%.*]] = ashr <2 x i8> <i8 -43, i8 -43>, %x
145; CHECK-NEXT:    ret <2 x i8> [[NOT]]
146;
147  %shr = lshr <2 x i8> <i8 42, i8 42>, %x
148  %not = xor <2 x i8> %shr, <i8 -1, i8 -1>
149  ret <2 x i8> %not
150}
151
152