1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt < %s -passes=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:    [[RET:%.*]] = icmp ult i8 [[X]], 4
25; CHECK-NEXT:    ret i1 [[RET]]
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:    [[RET:%.*]] = icmp ule i8 [[X]], [[TMP0]]
38; CHECK-NEXT:    ret i1 [[RET]]
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:    [[RET:%.*]] = icmp ult <2 x i8> [[X]], splat (i8 4)
55; CHECK-NEXT:    ret <2 x i1> [[RET]]
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:    [[RET:%.*]] = icmp ult <2 x i8> [[X]], <i8 4, i8 16>
67; CHECK-NEXT:    ret <2 x i1> [[RET]]
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:    [[RET:%.*]] = icmp ult <2 x i8> [[X]], <i8 4, i8 1>
79; CHECK-NEXT:    ret <2 x i1> [[RET]]
80;
81  %x = call <2 x i8> @gen2x8()
82  %tmp0 = and <2 x i8> %x, <i8 3, i8 0>
83  %ret = icmp ule <2 x i8> %x, %tmp0
84  ret <2 x i1> %ret
85}
86define <2 x i1> @p2_vec_nonsplat_edgecase1() {
87; CHECK-LABEL: @p2_vec_nonsplat_edgecase1(
88; CHECK-NEXT:    [[X:%.*]] = call <2 x i8> @gen2x8()
89; CHECK-NEXT:    [[RET:%.*]] = icmp ule <2 x i8> [[X]], <i8 3, i8 -1>
90; CHECK-NEXT:    ret <2 x i1> [[RET]]
91;
92  %x = call <2 x i8> @gen2x8()
93  %tmp0 = and <2 x i8> %x, <i8 3, i8 -1>
94  %ret = icmp ule <2 x i8> %x, %tmp0
95  ret <2 x i1> %ret
96}
97
98define <3 x i1> @p3_vec_splat_poison() {
99; CHECK-LABEL: @p3_vec_splat_poison(
100; CHECK-NEXT:    [[X:%.*]] = call <3 x i8> @gen3x8()
101; CHECK-NEXT:    [[RET:%.*]] = icmp ult <3 x i8> [[X]], splat (i8 4)
102; CHECK-NEXT:    ret <3 x i1> [[RET]]
103;
104  %x = call <3 x i8> @gen3x8()
105  %tmp0 = and <3 x i8> %x, <i8 3, i8 poison, i8 3>
106  %ret = icmp ule <3 x i8> %x, %tmp0
107  ret <3 x i1> %ret
108}
109
110; ============================================================================ ;
111; Commutativity tests.
112; ============================================================================ ;
113
114define i1 @c0(i8 %x) {
115; CHECK-LABEL: @c0(
116; CHECK-NEXT:    ret i1 true
117;
118  %tmp0 = and i8 %x, 3
119  %ret = icmp ule i8 %tmp0, %x ; swapped order
120  ret i1 %ret
121}
122
123; ============================================================================ ;
124; Commutativity tests with variable
125; ============================================================================ ;
126
127define i1 @cv0(i8 %y) {
128; CHECK-LABEL: @cv0(
129; CHECK-NEXT:    [[X:%.*]] = call i8 @gen8()
130; CHECK-NEXT:    [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
131; CHECK-NEXT:    [[RET:%.*]] = icmp ule i8 [[X]], [[TMP0]]
132; CHECK-NEXT:    ret i1 [[RET]]
133;
134  %x = call i8 @gen8()
135  %tmp0 = lshr i8 -1, %y
136  %tmp1 = and i8 %tmp0, %x ; swapped order
137  %ret = icmp ule i8 %x, %tmp1
138  ret i1 %ret
139}
140
141define i1 @cv1(i8 %y) {
142; CHECK-LABEL: @cv1(
143; CHECK-NEXT:    [[X:%.*]] = call i8 @gen8()
144; CHECK-NEXT:    ret i1 true
145;
146  %x = call i8 @gen8()
147  %tmp0 = lshr i8 -1, %y
148  %tmp1 = and i8 %x, %tmp0
149  %ret = icmp ule i8 %tmp1, %x ; swapped order
150  ret i1 %ret
151}
152
153define i1 @cv2(i8 %x, i8 %y) {
154; CHECK-LABEL: @cv2(
155; CHECK-NEXT:    ret i1 true
156;
157  %tmp0 = lshr i8 -1, %y
158  %tmp1 = and i8 %tmp0, %x ; swapped order
159  %ret = icmp ule i8 %tmp1, %x ; swapped order
160  ret i1 %ret
161}
162
163; ============================================================================ ;
164; One-use tests. We don't care about multi-uses here.
165; ============================================================================ ;
166
167declare void @use8(i8)
168
169define i1 @oneuse0() {
170; CHECK-LABEL: @oneuse0(
171; CHECK-NEXT:    [[X:%.*]] = call i8 @gen8()
172; CHECK-NEXT:    [[TMP0:%.*]] = and i8 [[X]], 3
173; CHECK-NEXT:    call void @use8(i8 [[TMP0]])
174; CHECK-NEXT:    [[RET:%.*]] = icmp ult i8 [[X]], 4
175; CHECK-NEXT:    ret i1 [[RET]]
176;
177  %x = call i8 @gen8()
178  %tmp0 = and i8 %x, 3
179  call void @use8(i8 %tmp0)
180  %ret = icmp ule i8 %x, %tmp0
181  ret i1 %ret
182}
183
184; ============================================================================ ;
185; Negative tests
186; ============================================================================ ;
187
188define i1 @n0() {
189; CHECK-LABEL: @n0(
190; CHECK-NEXT:    [[X:%.*]] = call i8 @gen8()
191; CHECK-NEXT:    [[TMP1:%.*]] = and i8 [[X]], -5
192; CHECK-NEXT:    [[RET:%.*]] = icmp eq i8 [[TMP1]], 0
193; CHECK-NEXT:    ret i1 [[RET]]
194;
195  %x = call i8 @gen8()
196  %tmp0 = and i8 %x, 4 ; power-of-two, but invalid.
197  %ret = icmp ule i8 %x, %tmp0
198  ret i1 %ret
199}
200
201define i1 @n1(i8 %y, i8 %notx) {
202; CHECK-LABEL: @n1(
203; CHECK-NEXT:    [[X:%.*]] = call i8 @gen8()
204; CHECK-NEXT:    [[TMP0:%.*]] = and i8 [[X]], 3
205; CHECK-NEXT:    [[RET:%.*]] = icmp ule i8 [[TMP0]], [[NOTX:%.*]]
206; CHECK-NEXT:    ret i1 [[RET]]
207;
208  %x = call i8 @gen8()
209  %tmp0 = and i8 %x, 3
210  %ret = icmp ule i8 %tmp0, %notx ; not %x
211  ret i1 %ret
212}
213
214define <2 x i1> @n2() {
215; CHECK-LABEL: @n2(
216; CHECK-NEXT:    [[X:%.*]] = call <2 x i8> @gen2x8()
217; CHECK-NEXT:    [[TMP1:%.*]] = and <2 x i8> [[X]], <i8 -4, i8 -17>
218; CHECK-NEXT:    [[RET:%.*]] = icmp eq <2 x i8> [[TMP1]], zeroinitializer
219; CHECK-NEXT:    ret <2 x i1> [[RET]]
220;
221  %x = call <2 x i8> @gen2x8()
222  %tmp0 = and <2 x i8> %x, <i8 3, i8 16> ; only the first one is valid.
223  %ret = icmp ule <2 x i8> %x, %tmp0
224  ret <2 x i1> %ret
225}
226