1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt < %s -instcombine -S | FileCheck %s
4 ; https://bugs.llvm.org/show_bug.cgi?id=38123
8 ; Should be transformed into:
10 ; Iff: isPowerOf2(C + 1)
13 ; ============================================================================ ;
14 ; Basic positive tests
15 ; ============================================================================ ;
17 define i1 @p0(i8 %x) {
19 ; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt i8 [[X:%.*]], 3
20 ; CHECK-NEXT: ret i1 [[TMP1]]
23 %ret = icmp ne i8 %tmp0, %x
27 define i1 @pv(i8 %x, i8 %y) {
29 ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
30 ; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i8 [[TMP0]], [[X:%.*]]
31 ; CHECK-NEXT: ret i1 [[TMP1]]
33 %tmp0 = lshr i8 -1, %y
34 %tmp1 = and i8 %tmp0, %x
35 %ret = icmp ne i8 %tmp1, %x
39 ; ============================================================================ ;
41 ; ============================================================================ ;
43 define <2 x i1> @p1_vec_splat(<2 x i8> %x) {
44 ; CHECK-LABEL: @p1_vec_splat(
45 ; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt <2 x i8> [[X:%.*]], <i8 3, i8 3>
46 ; CHECK-NEXT: ret <2 x i1> [[TMP1]]
48 %tmp0 = and <2 x i8> %x, <i8 3, i8 3>
49 %ret = icmp ne <2 x i8> %tmp0, %x
53 define <2 x i1> @p2_vec_nonsplat(<2 x i8> %x) {
54 ; CHECK-LABEL: @p2_vec_nonsplat(
55 ; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt <2 x i8> [[X:%.*]], <i8 3, i8 15>
56 ; CHECK-NEXT: ret <2 x i1> [[TMP1]]
58 %tmp0 = and <2 x i8> %x, <i8 3, i8 15> ; doesn't have to be splat.
59 %ret = icmp ne <2 x i8> %tmp0, %x
63 define <2 x i1> @p2_vec_nonsplat_edgecase0(<2 x i8> %x) {
64 ; CHECK-LABEL: @p2_vec_nonsplat_edgecase0(
65 ; CHECK-NEXT: [[TMP0:%.*]] = and <2 x i8> [[X:%.*]], <i8 3, i8 0>
66 ; CHECK-NEXT: [[RET:%.*]] = icmp ne <2 x i8> [[TMP0]], [[X]]
67 ; CHECK-NEXT: ret <2 x i1> [[RET]]
69 %tmp0 = and <2 x i8> %x, <i8 3, i8 0>
70 %ret = icmp ne <2 x i8> %tmp0, %x
73 define <2 x i1> @p2_vec_nonsplat_edgecase1(<2 x i8> %x) {
74 ; CHECK-LABEL: @p2_vec_nonsplat_edgecase1(
75 ; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt <2 x i8> [[X:%.*]], <i8 3, i8 -1>
76 ; CHECK-NEXT: ret <2 x i1> [[TMP1]]
78 %tmp0 = and <2 x i8> %x, <i8 3, i8 -1>
79 %ret = icmp ne <2 x i8> %tmp0, %x
83 define <3 x i1> @p3_vec_splat_undef(<3 x i8> %x) {
84 ; CHECK-LABEL: @p3_vec_splat_undef(
85 ; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt <3 x i8> [[X:%.*]], <i8 3, i8 undef, i8 3>
86 ; CHECK-NEXT: ret <3 x i1> [[TMP1]]
88 %tmp0 = and <3 x i8> %x, <i8 3, i8 undef, i8 3>
89 %ret = icmp ne <3 x i8> %tmp0, %x
93 ; ============================================================================ ;
94 ; Commutativity tests.
95 ; ============================================================================ ;
101 ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
102 ; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt i8 [[X]], 3
103 ; CHECK-NEXT: ret i1 [[TMP1]]
107 %ret = icmp ne i8 %x, %tmp0 ; swapped order
111 ; ============================================================================ ;
112 ; Commutativity tests with variable
113 ; ============================================================================ ;
115 define i1 @cv0(i8 %y) {
117 ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
118 ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
119 ; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt i8 [[X]], [[TMP0]]
120 ; CHECK-NEXT: ret i1 [[TMP1]]
123 %tmp0 = lshr i8 -1, %y
124 %tmp1 = and i8 %x, %tmp0 ; swapped order
125 %ret = icmp ne i8 %tmp1, %x
129 define i1 @cv1(i8 %y) {
131 ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
132 ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
133 ; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt i8 [[X]], [[TMP0]]
134 ; CHECK-NEXT: ret i1 [[TMP1]]
137 %tmp0 = lshr i8 -1, %y
138 %tmp1 = and i8 %tmp0, %x
139 %ret = icmp ne i8 %x, %tmp1 ; swapped order
143 define i1 @cv2(i8 %y) {
145 ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
146 ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
147 ; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt i8 [[X]], [[TMP0]]
148 ; CHECK-NEXT: ret i1 [[TMP1]]
151 %tmp0 = lshr i8 -1, %y
152 %tmp1 = and i8 %x, %tmp0 ; swapped order
153 %ret = icmp ne i8 %x, %tmp1 ; swapped order
157 ; ============================================================================ ;
158 ; One-use tests. We don't care about multi-uses here.
159 ; ============================================================================ ;
161 declare void @use8(i8)
163 define i1 @oneuse0(i8 %x) {
164 ; CHECK-LABEL: @oneuse0(
165 ; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 3
166 ; CHECK-NEXT: call void @use8(i8 [[TMP0]])
167 ; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt i8 [[X]], 3
168 ; CHECK-NEXT: ret i1 [[TMP1]]
171 call void @use8(i8 %tmp0)
172 %ret = icmp ne i8 %tmp0, %x
176 ; ============================================================================ ;
178 ; ============================================================================ ;
180 define i1 @n0(i8 %x) {
182 ; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 4
183 ; CHECK-NEXT: [[RET:%.*]] = icmp ne i8 [[TMP0]], [[X]]
184 ; CHECK-NEXT: ret i1 [[RET]]
186 %tmp0 = and i8 %x, 4 ; power-of-two, but invalid.
187 %ret = icmp ne i8 %tmp0, %x
191 define i1 @n1(i8 %x, i8 %y, i8 %notx) {
193 ; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 3
194 ; CHECK-NEXT: [[RET:%.*]] = icmp ne i8 [[TMP0]], [[NOTX:%.*]]
195 ; CHECK-NEXT: ret i1 [[RET]]
198 %ret = icmp ne i8 %tmp0, %notx ; not %x
202 define <2 x i1> @n2(<2 x i8> %x) {
204 ; CHECK-NEXT: [[TMP0:%.*]] = and <2 x i8> [[X:%.*]], <i8 3, i8 16>
205 ; CHECK-NEXT: [[RET:%.*]] = icmp ne <2 x i8> [[TMP0]], [[X]]
206 ; CHECK-NEXT: ret <2 x i1> [[RET]]
208 %tmp0 = and <2 x i8> %x, <i8 3, i8 16> ; only the first one is valid.
209 %ret = icmp ne <2 x i8> %tmp0, %x