1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt < %s -passes=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: [[RET:%.*]] = icmp ugt i8 [[X:%.*]], 3
20 ; CHECK-NEXT: ret i1 [[RET]]
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: [[RET:%.*]] = icmp ugt i8 [[X:%.*]], [[TMP0]]
31 ; CHECK-NEXT: ret i1 [[RET]]
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: [[RET:%.*]] = icmp ugt <2 x i8> [[X:%.*]], splat (i8 3)
46 ; CHECK-NEXT: ret <2 x i1> [[RET]]
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: [[RET:%.*]] = icmp ugt <2 x i8> [[X:%.*]], <i8 3, i8 15>
56 ; CHECK-NEXT: ret <2 x i1> [[RET]]
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: [[RET:%.*]] = icmp ugt <2 x i8> [[X:%.*]], <i8 3, i8 0>
66 ; CHECK-NEXT: ret <2 x i1> [[RET]]
68 %tmp0 = and <2 x i8> %x, <i8 3, i8 0>
69 %ret = icmp ne <2 x i8> %tmp0, %x
72 define <2 x i1> @p2_vec_nonsplat_edgecase1(<2 x i8> %x) {
73 ; CHECK-LABEL: @p2_vec_nonsplat_edgecase1(
74 ; CHECK-NEXT: [[RET:%.*]] = icmp ugt <2 x i8> [[X:%.*]], <i8 3, i8 -1>
75 ; CHECK-NEXT: ret <2 x i1> [[RET]]
77 %tmp0 = and <2 x i8> %x, <i8 3, i8 -1>
78 %ret = icmp ne <2 x i8> %tmp0, %x
82 define <3 x i1> @p3_vec_splat_poison(<3 x i8> %x) {
83 ; CHECK-LABEL: @p3_vec_splat_poison(
84 ; CHECK-NEXT: [[RET:%.*]] = icmp ugt <3 x i8> [[X:%.*]], <i8 3, i8 poison, i8 3>
85 ; CHECK-NEXT: ret <3 x i1> [[RET]]
87 %tmp0 = and <3 x i8> %x, <i8 3, i8 poison, i8 3>
88 %ret = icmp ne <3 x i8> %tmp0, %x
92 define <3 x i1> @p3_vec_nonsplat_poison(<3 x i8> %x) {
93 ; CHECK-LABEL: @p3_vec_nonsplat_poison(
94 ; CHECK-NEXT: [[RET:%.*]] = icmp ugt <3 x i8> [[X:%.*]], <i8 -1, i8 poison, i8 3>
95 ; CHECK-NEXT: ret <3 x i1> [[RET]]
97 %tmp0 = and <3 x i8> %x, <i8 -1, i8 poison, i8 3>
98 %ret = icmp ne <3 x i8> %tmp0, %x
102 ; ============================================================================ ;
103 ; Commutativity tests.
104 ; ============================================================================ ;
110 ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
111 ; CHECK-NEXT: [[RET:%.*]] = icmp ugt i8 [[X]], 3
112 ; CHECK-NEXT: ret i1 [[RET]]
116 %ret = icmp ne i8 %x, %tmp0 ; swapped order
120 ; ============================================================================ ;
121 ; Commutativity tests with variable
122 ; ============================================================================ ;
124 define i1 @cv0(i8 %y) {
126 ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
127 ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
128 ; CHECK-NEXT: [[RET:%.*]] = icmp ugt i8 [[X]], [[TMP0]]
129 ; CHECK-NEXT: ret i1 [[RET]]
132 %tmp0 = lshr i8 -1, %y
133 %tmp1 = and i8 %x, %tmp0 ; swapped order
134 %ret = icmp ne i8 %tmp1, %x
138 define i1 @cv1(i8 %y) {
140 ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
141 ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
142 ; CHECK-NEXT: [[RET:%.*]] = icmp ugt i8 [[X]], [[TMP0]]
143 ; CHECK-NEXT: ret i1 [[RET]]
146 %tmp0 = lshr i8 -1, %y
147 %tmp1 = and i8 %tmp0, %x
148 %ret = icmp ne i8 %x, %tmp1 ; swapped order
152 define i1 @cv2(i8 %y) {
154 ; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()
155 ; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]
156 ; CHECK-NEXT: [[RET:%.*]] = icmp ugt i8 [[X]], [[TMP0]]
157 ; CHECK-NEXT: ret i1 [[RET]]
160 %tmp0 = lshr i8 -1, %y
161 %tmp1 = and i8 %x, %tmp0 ; swapped order
162 %ret = icmp ne i8 %x, %tmp1 ; swapped order
166 ; ============================================================================ ;
167 ; One-use tests. We don't care about multi-uses here.
168 ; ============================================================================ ;
170 declare void @use8(i8)
172 define i1 @oneuse0(i8 %x) {
173 ; CHECK-LABEL: @oneuse0(
174 ; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 3
175 ; CHECK-NEXT: call void @use8(i8 [[TMP0]])
176 ; CHECK-NEXT: [[RET:%.*]] = icmp ugt i8 [[X]], 3
177 ; CHECK-NEXT: ret i1 [[RET]]
180 call void @use8(i8 %tmp0)
181 %ret = icmp ne i8 %tmp0, %x
185 ; ============================================================================ ;
187 ; ============================================================================ ;
189 define i1 @n0(i8 %x) {
191 ; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[X:%.*]], -5
192 ; CHECK-NEXT: [[RET:%.*]] = icmp ne i8 [[TMP1]], 0
193 ; CHECK-NEXT: ret i1 [[RET]]
195 %tmp0 = and i8 %x, 4 ; power-of-two, but invalid.
196 %ret = icmp ne i8 %tmp0, %x
200 define i1 @n1(i8 %x, i8 %y, i8 %notx) {
202 ; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 3
203 ; CHECK-NEXT: [[RET:%.*]] = icmp ne i8 [[TMP0]], [[NOTX:%.*]]
204 ; CHECK-NEXT: ret i1 [[RET]]
207 %ret = icmp ne i8 %tmp0, %notx ; not %x
211 define <2 x i1> @n2(<2 x i8> %x) {
213 ; CHECK-NEXT: [[TMP1:%.*]] = and <2 x i8> [[X:%.*]], <i8 -4, i8 -17>
214 ; CHECK-NEXT: [[RET:%.*]] = icmp ne <2 x i8> [[TMP1]], zeroinitializer
215 ; CHECK-NEXT: ret <2 x i1> [[RET]]
217 %tmp0 = and <2 x i8> %x, <i8 3, i8 16> ; only the first one is valid.
218 %ret = icmp ne <2 x i8> %tmp0, %x