1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt < %s -instcombine -S | FileCheck %s
3
4; https://bugs.llvm.org/show_bug.cgi?id=38123
5
6; Pattern:
7;   x u<= x & C
8; Should be transformed into:
9;   x u<= C
10; Iff: isPowerOf2(C + 1)
11; C can be 0 and -1.
12
13declare i8 @gen8()
14declare <2 x i8> @gen2x8()
15declare <3 x i8> @gen3x8()
16
17; ============================================================================ ;
18; Basic positive tests
19; ============================================================================ ;
20
21define i1 @p0() {
22; CHECK-LABEL: @p0(
23; CHECK-NEXT:    [[X:%.*]] = call i8 @gen8()
24; CHECK-NEXT:    [[TMP1:%.*]] = icmp ult i8 [[X]], 4
25; CHECK-NEXT:    ret i1 [[TMP1]]
26;
27  %x = call i8 @gen8()
28  %tmp0 = and i8 %x, 3
29  %ret = icmp ule i8 %x, %tmp0
30  ret i1 %ret
31}
32
33define i1 @pv(i8 %y) {
34; CHECK-LABEL: @pv(
35; CHECK-NEXT:    [[X:%.*]] = call i8 @gen8()
36; CHECK-NEXT:    [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
37; CHECK-NEXT:    [[TMP1:%.*]] = icmp ule i8 [[X]], [[TMP0]]
38; CHECK-NEXT:    ret i1 [[TMP1]]
39;
40  %x = call i8 @gen8()
41  %tmp0 = lshr i8 -1, %y
42  %tmp1 = and i8 %tmp0, %x
43  %ret = icmp ule i8 %x, %tmp1
44  ret i1 %ret
45}
46
47; ============================================================================ ;
48; Vector tests
49; ============================================================================ ;
50
51define <2 x i1> @p1_vec_splat() {
52; CHECK-LABEL: @p1_vec_splat(
53; CHECK-NEXT:    [[X:%.*]] = call <2 x i8> @gen2x8()
54; CHECK-NEXT:    [[TMP1:%.*]] = icmp ult <2 x i8> [[X]], <i8 4, i8 4>
55; CHECK-NEXT:    ret <2 x i1> [[TMP1]]
56;
57  %x = call <2 x i8> @gen2x8()
58  %tmp0 = and <2 x i8> %x, <i8 3, i8 3>
59  %ret = icmp ule <2 x i8> %x, %tmp0
60  ret <2 x i1> %ret
61}
62
63define <2 x i1> @p2_vec_nonsplat() {
64; CHECK-LABEL: @p2_vec_nonsplat(
65; CHECK-NEXT:    [[X:%.*]] = call <2 x i8> @gen2x8()
66; CHECK-NEXT:    [[TMP1:%.*]] = icmp ult <2 x i8> [[X]], <i8 4, i8 16>
67; CHECK-NEXT:    ret <2 x i1> [[TMP1]]
68;
69  %x = call <2 x i8> @gen2x8()
70  %tmp0 = and <2 x i8> %x, <i8 3, i8 15> ; doesn't have to be splat.
71  %ret = icmp ule <2 x i8> %x, %tmp0
72  ret <2 x i1> %ret
73}
74
75define <2 x i1> @p2_vec_nonsplat_edgecase0() {
76; CHECK-LABEL: @p2_vec_nonsplat_edgecase0(
77; CHECK-NEXT:    [[X:%.*]] = call <2 x i8> @gen2x8()
78; CHECK-NEXT:    [[TMP0:%.*]] = and <2 x i8> [[X]], <i8 3, i8 0>
79; CHECK-NEXT:    [[RET:%.*]] = icmp ule <2 x i8> [[X]], [[TMP0]]
80; CHECK-NEXT:    ret <2 x i1> [[RET]]
81;
82  %x = call <2 x i8> @gen2x8()
83  %tmp0 = and <2 x i8> %x, <i8 3, i8 0>
84  %ret = icmp ule <2 x i8> %x, %tmp0
85  ret <2 x i1> %ret
86}
87define <2 x i1> @p2_vec_nonsplat_edgecase1() {
88; CHECK-LABEL: @p2_vec_nonsplat_edgecase1(
89; CHECK-NEXT:    [[X:%.*]] = call <2 x i8> @gen2x8()
90; CHECK-NEXT:    [[TMP1:%.*]] = icmp ule <2 x i8> [[X]], <i8 3, i8 -1>
91; CHECK-NEXT:    ret <2 x i1> [[TMP1]]
92;
93  %x = call <2 x i8> @gen2x8()
94  %tmp0 = and <2 x i8> %x, <i8 3, i8 -1>
95  %ret = icmp ule <2 x i8> %x, %tmp0
96  ret <2 x i1> %ret
97}
98
99define <3 x i1> @p3_vec_splat_undef() {
100; CHECK-LABEL: @p3_vec_splat_undef(
101; CHECK-NEXT:    [[X:%.*]] = call <3 x i8> @gen3x8()
102; CHECK-NEXT:    [[TMP1:%.*]] = icmp ult <3 x i8> [[X]], <i8 4, i8 4, i8 4>
103; CHECK-NEXT:    ret <3 x i1> [[TMP1]]
104;
105  %x = call <3 x i8> @gen3x8()
106  %tmp0 = and <3 x i8> %x, <i8 3, i8 undef, i8 3>
107  %ret = icmp ule <3 x i8> %x, %tmp0
108  ret <3 x i1> %ret
109}
110
111; ============================================================================ ;
112; Commutativity tests.
113; ============================================================================ ;
114
115define i1 @c0(i8 %x) {
116; CHECK-LABEL: @c0(
117; CHECK-NEXT:    ret i1 true
118;
119  %tmp0 = and i8 %x, 3
120  %ret = icmp ule i8 %tmp0, %x ; swapped order
121  ret i1 %ret
122}
123
124; ============================================================================ ;
125; Commutativity tests with variable
126; ============================================================================ ;
127
128define i1 @cv0(i8 %y) {
129; CHECK-LABEL: @cv0(
130; CHECK-NEXT:    [[X:%.*]] = call i8 @gen8()
131; CHECK-NEXT:    [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
132; CHECK-NEXT:    [[TMP1:%.*]] = icmp ule i8 [[X]], [[TMP0]]
133; CHECK-NEXT:    ret i1 [[TMP1]]
134;
135  %x = call i8 @gen8()
136  %tmp0 = lshr i8 -1, %y
137  %tmp1 = and i8 %tmp0, %x ; swapped order
138  %ret = icmp ule i8 %x, %tmp1
139  ret i1 %ret
140}
141
142define i1 @cv1(i8 %y) {
143; CHECK-LABEL: @cv1(
144; CHECK-NEXT:    [[X:%.*]] = call i8 @gen8()
145; CHECK-NEXT:    ret i1 true
146;
147  %x = call i8 @gen8()
148  %tmp0 = lshr i8 -1, %y
149  %tmp1 = and i8 %x, %tmp0
150  %ret = icmp ule i8 %tmp1, %x ; swapped order
151  ret i1 %ret
152}
153
154define i1 @cv2(i8 %x, i8 %y) {
155; CHECK-LABEL: @cv2(
156; CHECK-NEXT:    ret i1 true
157;
158  %tmp0 = lshr i8 -1, %y
159  %tmp1 = and i8 %tmp0, %x ; swapped order
160  %ret = icmp ule i8 %tmp1, %x ; swapped order
161  ret i1 %ret
162}
163
164; ============================================================================ ;
165; One-use tests. We don't care about multi-uses here.
166; ============================================================================ ;
167
168declare void @use8(i8)
169
170define i1 @oneuse0() {
171; CHECK-LABEL: @oneuse0(
172; CHECK-NEXT:    [[X:%.*]] = call i8 @gen8()
173; CHECK-NEXT:    [[TMP0:%.*]] = and i8 [[X]], 3
174; CHECK-NEXT:    call void @use8(i8 [[TMP0]])
175; CHECK-NEXT:    [[TMP1:%.*]] = icmp ult i8 [[X]], 4
176; CHECK-NEXT:    ret i1 [[TMP1]]
177;
178  %x = call i8 @gen8()
179  %tmp0 = and i8 %x, 3
180  call void @use8(i8 %tmp0)
181  %ret = icmp ule i8 %x, %tmp0
182  ret i1 %ret
183}
184
185; ============================================================================ ;
186; Negative tests
187; ============================================================================ ;
188
189define i1 @n0() {
190; CHECK-LABEL: @n0(
191; CHECK-NEXT:    [[X:%.*]] = call i8 @gen8()
192; CHECK-NEXT:    [[TMP0:%.*]] = and i8 [[X]], 4
193; CHECK-NEXT:    [[RET:%.*]] = icmp ule i8 [[X]], [[TMP0]]
194; CHECK-NEXT:    ret i1 [[RET]]
195;
196  %x = call i8 @gen8()
197  %tmp0 = and i8 %x, 4 ; power-of-two, but invalid.
198  %ret = icmp ule i8 %x, %tmp0
199  ret i1 %ret
200}
201
202define i1 @n1(i8 %y, i8 %notx) {
203; CHECK-LABEL: @n1(
204; CHECK-NEXT:    [[X:%.*]] = call i8 @gen8()
205; CHECK-NEXT:    [[TMP0:%.*]] = and i8 [[X]], 3
206; CHECK-NEXT:    [[RET:%.*]] = icmp ule i8 [[TMP0]], [[NOTX:%.*]]
207; CHECK-NEXT:    ret i1 [[RET]]
208;
209  %x = call i8 @gen8()
210  %tmp0 = and i8 %x, 3
211  %ret = icmp ule i8 %tmp0, %notx ; not %x
212  ret i1 %ret
213}
214
215define <2 x i1> @n2() {
216; CHECK-LABEL: @n2(
217; CHECK-NEXT:    [[X:%.*]] = call <2 x i8> @gen2x8()
218; CHECK-NEXT:    [[TMP0:%.*]] = and <2 x i8> [[X]], <i8 3, i8 16>
219; CHECK-NEXT:    [[RET:%.*]] = icmp ule <2 x i8> [[X]], [[TMP0]]
220; CHECK-NEXT:    ret <2 x i1> [[RET]]
221;
222  %x = call <2 x i8> @gen2x8()
223  %tmp0 = and <2 x i8> %x, <i8 3, i8 16> ; only the first one is valid.
224  %ret = icmp ule <2 x i8> %x, %tmp0
225  ret <2 x i1> %ret
226}
227