Chandler Carruth | ef8d516 | 2012-12-09 07:26:04 +0000 | [diff] [blame] | 1 | // RUN: %clang_cc1 -triple x86_64-unknown-unknown -verify -emit-llvm -o - %s \ |
| 2 | // RUN: | FileCheck -check-prefix=CHECK-X86-64 %s |
| 3 | // RUN: %clang_cc1 -triple powerpc64-unknown-unknown -verify -emit-llvm -o - %s \ |
| 4 | // RUN: | FileCheck -check-prefix=CHECK-PPC64 %s |
Chandler Carruth | 72d2dab | 2012-12-06 11:14:44 +0000 | [diff] [blame] | 5 | // |
| 6 | // Tests for bitfield access patterns in C++ with special attention to |
| 7 | // conformance to C++11 memory model requirements. |
| 8 | |
Chandler Carruth | 5588a69 | 2012-12-09 10:08:22 +0000 | [diff] [blame] | 9 | namespace N0 { |
| 10 | // Test basic bitfield layout access across interesting byte and word |
| 11 | // boundaries on both little endian and big endian platforms. |
| 12 | struct __attribute__((packed)) S { |
| 13 | unsigned b00 : 14; |
| 14 | unsigned b01 : 2; |
| 15 | unsigned b20 : 6; |
| 16 | unsigned b21 : 2; |
| 17 | unsigned b30 : 30; |
| 18 | unsigned b31 : 2; |
| 19 | unsigned b70 : 6; |
| 20 | unsigned b71 : 2; |
| 21 | }; |
| 22 | unsigned read00(S* s) { |
| 23 | // CHECK-X86-64: define i32 @_ZN2N06read00 |
| 24 | // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| 25 | // CHECK-X86-64: %[[val:.*]] = load i64* %[[ptr]] |
| 26 | // CHECK-X86-64: %[[and:.*]] = and i64 %[[val]], 16383 |
| 27 | // CHECK-X86-64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| 28 | // CHECK-X86-64: ret i32 %[[trunc]] |
| 29 | // CHECK-PPC64: define zeroext i32 @_ZN2N06read00 |
| 30 | // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| 31 | // CHECK-PPC64: %[[val:.*]] = load i64* %[[ptr]] |
| 32 | // CHECK-PPC64: %[[shr:.*]] = lshr i64 %[[val]], 50 |
| 33 | // CHECK-PPC64: %[[trunc:.*]] = trunc i64 %[[shr]] to i32 |
| 34 | // CHECK-PPC64: ret i32 %[[trunc]] |
| 35 | return s->b00; |
| 36 | } |
| 37 | unsigned read01(S* s) { |
| 38 | // CHECK-X86-64: define i32 @_ZN2N06read01 |
| 39 | // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| 40 | // CHECK-X86-64: %[[val:.*]] = load i64* %[[ptr]] |
| 41 | // CHECK-X86-64: %[[shr:.*]] = lshr i64 %[[val]], 14 |
| 42 | // CHECK-X86-64: %[[and:.*]] = and i64 %[[shr]], 3 |
| 43 | // CHECK-X86-64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| 44 | // CHECK-X86-64: ret i32 %[[trunc]] |
| 45 | // CHECK-PPC64: define zeroext i32 @_ZN2N06read01 |
| 46 | // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| 47 | // CHECK-PPC64: %[[val:.*]] = load i64* %[[ptr]] |
| 48 | // CHECK-PPC64: %[[shr:.*]] = lshr i64 %[[val]], 48 |
| 49 | // CHECK-PPC64: %[[and:.*]] = and i64 %[[shr]], 3 |
| 50 | // CHECK-PPC64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| 51 | // CHECK-PPC64: ret i32 %[[trunc]] |
| 52 | return s->b01; |
| 53 | } |
| 54 | unsigned read20(S* s) { |
| 55 | // CHECK-X86-64: define i32 @_ZN2N06read20 |
| 56 | // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| 57 | // CHECK-X86-64: %[[val:.*]] = load i64* %[[ptr]] |
| 58 | // CHECK-X86-64: %[[shr:.*]] = lshr i64 %[[val]], 16 |
| 59 | // CHECK-X86-64: %[[and:.*]] = and i64 %[[shr]], 63 |
| 60 | // CHECK-X86-64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| 61 | // CHECK-X86-64: ret i32 %[[trunc]] |
| 62 | // CHECK-PPC64: define zeroext i32 @_ZN2N06read20 |
| 63 | // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| 64 | // CHECK-PPC64: %[[val:.*]] = load i64* %[[ptr]] |
| 65 | // CHECK-PPC64: %[[shr:.*]] = lshr i64 %[[val]], 42 |
| 66 | // CHECK-PPC64: %[[and:.*]] = and i64 %[[shr]], 63 |
| 67 | // CHECK-PPC64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| 68 | // CHECK-PPC64: ret i32 %[[trunc]] |
| 69 | return s->b20; |
| 70 | } |
| 71 | unsigned read21(S* s) { |
| 72 | // CHECK-X86-64: define i32 @_ZN2N06read21 |
| 73 | // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| 74 | // CHECK-X86-64: %[[val:.*]] = load i64* %[[ptr]] |
| 75 | // CHECK-X86-64: %[[shr:.*]] = lshr i64 %[[val]], 22 |
| 76 | // CHECK-X86-64: %[[and:.*]] = and i64 %[[shr]], 3 |
| 77 | // CHECK-X86-64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| 78 | // CHECK-X86-64: ret i32 %[[trunc]] |
| 79 | // CHECK-PPC64: define zeroext i32 @_ZN2N06read21 |
| 80 | // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| 81 | // CHECK-PPC64: %[[val:.*]] = load i64* %[[ptr]] |
| 82 | // CHECK-PPC64: %[[shr:.*]] = lshr i64 %[[val]], 40 |
| 83 | // CHECK-PPC64: %[[and:.*]] = and i64 %[[shr]], 3 |
| 84 | // CHECK-PPC64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| 85 | // CHECK-PPC64: ret i32 %[[trunc]] |
| 86 | return s->b21; |
| 87 | } |
| 88 | unsigned read30(S* s) { |
| 89 | // CHECK-X86-64: define i32 @_ZN2N06read30 |
| 90 | // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| 91 | // CHECK-X86-64: %[[val:.*]] = load i64* %[[ptr]] |
| 92 | // CHECK-X86-64: %[[shr:.*]] = lshr i64 %[[val]], 24 |
| 93 | // CHECK-X86-64: %[[and:.*]] = and i64 %[[shr]], 1073741823 |
| 94 | // CHECK-X86-64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| 95 | // CHECK-X86-64: ret i32 %[[trunc]] |
| 96 | // CHECK-PPC64: define zeroext i32 @_ZN2N06read30 |
| 97 | // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| 98 | // CHECK-PPC64: %[[val:.*]] = load i64* %[[ptr]] |
| 99 | // CHECK-PPC64: %[[shr:.*]] = lshr i64 %[[val]], 10 |
| 100 | // CHECK-PPC64: %[[and:.*]] = and i64 %[[shr]], 1073741823 |
| 101 | // CHECK-PPC64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| 102 | // CHECK-PPC64: ret i32 %[[trunc]] |
| 103 | return s->b30; |
| 104 | } |
| 105 | unsigned read31(S* s) { |
| 106 | // CHECK-X86-64: define i32 @_ZN2N06read31 |
| 107 | // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| 108 | // CHECK-X86-64: %[[val:.*]] = load i64* %[[ptr]] |
| 109 | // CHECK-X86-64: %[[shr:.*]] = lshr i64 %[[val]], 54 |
| 110 | // CHECK-X86-64: %[[and:.*]] = and i64 %[[shr]], 3 |
| 111 | // CHECK-X86-64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| 112 | // CHECK-X86-64: ret i32 %[[trunc]] |
| 113 | // CHECK-PPC64: define zeroext i32 @_ZN2N06read31 |
| 114 | // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| 115 | // CHECK-PPC64: %[[val:.*]] = load i64* %[[ptr]] |
| 116 | // CHECK-PPC64: %[[shr:.*]] = lshr i64 %[[val]], 8 |
| 117 | // CHECK-PPC64: %[[and:.*]] = and i64 %[[shr]], 3 |
| 118 | // CHECK-PPC64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| 119 | // CHECK-PPC64: ret i32 %[[trunc]] |
| 120 | return s->b31; |
| 121 | } |
| 122 | unsigned read70(S* s) { |
| 123 | // CHECK-X86-64: define i32 @_ZN2N06read70 |
| 124 | // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| 125 | // CHECK-X86-64: %[[val:.*]] = load i64* %[[ptr]] |
| 126 | // CHECK-X86-64: %[[shr:.*]] = lshr i64 %[[val]], 56 |
| 127 | // CHECK-X86-64: %[[and:.*]] = and i64 %[[shr]], 63 |
| 128 | // CHECK-X86-64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| 129 | // CHECK-X86-64: ret i32 %[[trunc]] |
| 130 | // CHECK-PPC64: define zeroext i32 @_ZN2N06read70 |
| 131 | // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| 132 | // CHECK-PPC64: %[[val:.*]] = load i64* %[[ptr]] |
| 133 | // CHECK-PPC64: %[[shr:.*]] = lshr i64 %[[val]], 2 |
| 134 | // CHECK-PPC64: %[[and:.*]] = and i64 %[[shr]], 63 |
| 135 | // CHECK-PPC64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| 136 | // CHECK-PPC64: ret i32 %[[trunc]] |
| 137 | return s->b70; |
| 138 | } |
| 139 | unsigned read71(S* s) { |
| 140 | // CHECK-X86-64: define i32 @_ZN2N06read71 |
| 141 | // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| 142 | // CHECK-X86-64: %[[val:.*]] = load i64* %[[ptr]] |
| 143 | // CHECK-X86-64: %[[shr:.*]] = lshr i64 %[[val]], 62 |
| 144 | // CHECK-X86-64: %[[trunc:.*]] = trunc i64 %[[shr]] to i32 |
| 145 | // CHECK-X86-64: ret i32 %[[trunc]] |
| 146 | // CHECK-PPC64: define zeroext i32 @_ZN2N06read71 |
| 147 | // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i64* |
| 148 | // CHECK-PPC64: %[[val:.*]] = load i64* %[[ptr]] |
| 149 | // CHECK-PPC64: %[[and:.*]] = and i64 %[[val]], 3 |
| 150 | // CHECK-PPC64: %[[trunc:.*]] = trunc i64 %[[and]] to i32 |
| 151 | // CHECK-PPC64: ret i32 %[[trunc]] |
| 152 | return s->b71; |
| 153 | } |
| 154 | } |
| 155 | |
Chandler Carruth | 72d2dab | 2012-12-06 11:14:44 +0000 | [diff] [blame] | 156 | namespace N1 { |
| 157 | // Ensure that neither loads nor stores to bitfields are not widened into |
| 158 | // other memory locations. (PR13691) |
| 159 | // |
| 160 | // NOTE: We could potentially widen loads based on their alignment if we are |
| 161 | // comfortable requiring that subsequent memory locations within the |
| 162 | // alignment-widened load are not volatile. |
| 163 | struct S { |
| 164 | char a; |
| 165 | unsigned b : 1; |
| 166 | char c; |
| 167 | }; |
| 168 | unsigned read(S* s) { |
Chandler Carruth | ef8d516 | 2012-12-09 07:26:04 +0000 | [diff] [blame] | 169 | // CHECK-X86-64: define i32 @_ZN2N14read |
| 170 | // CHECK-X86-64: %[[ptr:.*]] = getelementptr inbounds %{{.*}}* %{{.*}}, i32 0, i32 1 |
| 171 | // CHECK-X86-64: %[[val:.*]] = load i8* %[[ptr]] |
| 172 | // CHECK-X86-64: %[[and:.*]] = and i8 %[[val]], 1 |
| 173 | // CHECK-X86-64: %[[ext:.*]] = zext i8 %[[and]] to i32 |
| 174 | // CHECK-X86-64: ret i32 %[[ext]] |
| 175 | // CHECK-PPC64: define zeroext i32 @_ZN2N14read |
| 176 | // CHECK-PPC64: %[[ptr:.*]] = getelementptr inbounds %{{.*}}* %{{.*}}, i32 0, i32 1 |
| 177 | // CHECK-PPC64: %[[val:.*]] = load i8* %[[ptr]] |
| 178 | // CHECK-PPC64: %[[shr:.*]] = lshr i8 %[[val]], 7 |
| 179 | // CHECK-PPC64: %[[ext:.*]] = zext i8 %[[shr]] to i32 |
| 180 | // CHECK-PPC64: ret i32 %[[ext]] |
Chandler Carruth | 72d2dab | 2012-12-06 11:14:44 +0000 | [diff] [blame] | 181 | return s->b; |
| 182 | } |
| 183 | void write(S* s, unsigned x) { |
Chandler Carruth | ef8d516 | 2012-12-09 07:26:04 +0000 | [diff] [blame] | 184 | // CHECK-X86-64: define void @_ZN2N15write |
| 185 | // CHECK-X86-64: %[[ptr:.*]] = getelementptr inbounds %{{.*}}* %{{.*}}, i32 0, i32 1 |
| 186 | // CHECK-X86-64: %[[x_trunc:.*]] = trunc i32 %{{.*}} to i8 |
| 187 | // CHECK-X86-64: %[[old:.*]] = load i8* %[[ptr]] |
| 188 | // CHECK-X86-64: %[[x_and:.*]] = and i8 %[[x_trunc]], 1 |
| 189 | // CHECK-X86-64: %[[old_and:.*]] = and i8 %[[old]], -2 |
| 190 | // CHECK-X86-64: %[[new:.*]] = or i8 %[[old_and]], %[[x_and]] |
| 191 | // CHECK-X86-64: store i8 %[[new]], i8* %[[ptr]] |
| 192 | // CHECK-PPC64: define void @_ZN2N15write |
| 193 | // CHECK-PPC64: %[[ptr:.*]] = getelementptr inbounds %{{.*}}* %{{.*}}, i32 0, i32 1 |
| 194 | // CHECK-PPC64: %[[x_trunc:.*]] = trunc i32 %{{.*}} to i8 |
| 195 | // CHECK-PPC64: %[[old:.*]] = load i8* %[[ptr]] |
| 196 | // CHECK-PPC64: %[[x_and:.*]] = and i8 %[[x_trunc]], 1 |
| 197 | // CHECK-PPC64: %[[x_shl:.*]] = shl i8 %[[x_and]], 7 |
| 198 | // CHECK-PPC64: %[[old_and:.*]] = and i8 %[[old]], 127 |
| 199 | // CHECK-PPC64: %[[new:.*]] = or i8 %[[old_and]], %[[x_shl]] |
| 200 | // CHECK-PPC64: store i8 %[[new]], i8* %[[ptr]] |
Chandler Carruth | 72d2dab | 2012-12-06 11:14:44 +0000 | [diff] [blame] | 201 | s->b = x; |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | namespace N2 { |
| 206 | // Do widen loads and stores to bitfields when those bitfields have padding |
| 207 | // within the struct following them. |
| 208 | struct S { |
| 209 | unsigned b : 24; |
| 210 | void *p; |
| 211 | }; |
| 212 | unsigned read(S* s) { |
Chandler Carruth | ef8d516 | 2012-12-09 07:26:04 +0000 | [diff] [blame] | 213 | // CHECK-X86-64: define i32 @_ZN2N24read |
| 214 | // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| 215 | // CHECK-X86-64: %[[val:.*]] = load i32* %[[ptr]] |
| 216 | // CHECK-X86-64: %[[and:.*]] = and i32 %[[val]], 16777215 |
| 217 | // CHECK-X86-64: ret i32 %[[and]] |
| 218 | // CHECK-PPC64: define zeroext i32 @_ZN2N24read |
| 219 | // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| 220 | // CHECK-PPC64: %[[val:.*]] = load i32* %[[ptr]] |
| 221 | // CHECK-PPC64: %[[shr:.*]] = lshr i32 %[[val]], 8 |
| 222 | // CHECK-PPC64: ret i32 %[[shr]] |
Chandler Carruth | 72d2dab | 2012-12-06 11:14:44 +0000 | [diff] [blame] | 223 | return s->b; |
| 224 | } |
| 225 | void write(S* s, unsigned x) { |
Chandler Carruth | ef8d516 | 2012-12-09 07:26:04 +0000 | [diff] [blame] | 226 | // CHECK-X86-64: define void @_ZN2N25write |
| 227 | // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| 228 | // CHECK-X86-64: %[[old:.*]] = load i32* %[[ptr]] |
| 229 | // CHECK-X86-64: %[[x_and:.*]] = and i32 %{{.*}}, 16777215 |
| 230 | // CHECK-X86-64: %[[old_and:.*]] = and i32 %[[old]], -16777216 |
| 231 | // CHECK-X86-64: %[[new:.*]] = or i32 %[[old_and]], %[[x_and]] |
| 232 | // CHECK-X86-64: store i32 %[[new]], i32* %[[ptr]] |
| 233 | // CHECK-PPC64: define void @_ZN2N25write |
| 234 | // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| 235 | // CHECK-PPC64: %[[old:.*]] = load i32* %[[ptr]] |
| 236 | // CHECK-PPC64: %[[x_and:.*]] = and i32 %{{.*}}, 16777215 |
| 237 | // CHECK-PPC64: %[[x_shl:.*]] = shl i32 %[[x_and]], 8 |
| 238 | // CHECK-PPC64: %[[old_and:.*]] = and i32 %[[old]], 255 |
| 239 | // CHECK-PPC64: %[[new:.*]] = or i32 %[[old_and]], %[[x_shl]] |
| 240 | // CHECK-PPC64: store i32 %[[new]], i32* %[[ptr]] |
Chandler Carruth | 72d2dab | 2012-12-06 11:14:44 +0000 | [diff] [blame] | 241 | s->b = x; |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | namespace N3 { |
| 246 | // Do widen loads and stores to bitfields through the trailing padding at the |
| 247 | // end of a struct. |
| 248 | struct S { |
| 249 | unsigned b : 24; |
| 250 | }; |
| 251 | unsigned read(S* s) { |
Chandler Carruth | ef8d516 | 2012-12-09 07:26:04 +0000 | [diff] [blame] | 252 | // CHECK-X86-64: define i32 @_ZN2N34read |
| 253 | // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| 254 | // CHECK-X86-64: %[[val:.*]] = load i32* %[[ptr]] |
| 255 | // CHECK-X86-64: %[[and:.*]] = and i32 %[[val]], 16777215 |
| 256 | // CHECK-X86-64: ret i32 %[[and]] |
| 257 | // CHECK-PPC64: define zeroext i32 @_ZN2N34read |
| 258 | // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| 259 | // CHECK-PPC64: %[[val:.*]] = load i32* %[[ptr]] |
| 260 | // CHECK-PPC64: %[[shr:.*]] = lshr i32 %[[val]], 8 |
| 261 | // CHECK-PPC64: ret i32 %[[shr]] |
Chandler Carruth | 72d2dab | 2012-12-06 11:14:44 +0000 | [diff] [blame] | 262 | return s->b; |
| 263 | } |
| 264 | void write(S* s, unsigned x) { |
Chandler Carruth | ef8d516 | 2012-12-09 07:26:04 +0000 | [diff] [blame] | 265 | // CHECK-X86-64: define void @_ZN2N35write |
| 266 | // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| 267 | // CHECK-X86-64: %[[old:.*]] = load i32* %[[ptr]] |
| 268 | // CHECK-X86-64: %[[x_and:.*]] = and i32 %{{.*}}, 16777215 |
| 269 | // CHECK-X86-64: %[[old_and:.*]] = and i32 %[[old]], -16777216 |
| 270 | // CHECK-X86-64: %[[new:.*]] = or i32 %[[old_and]], %[[x_and]] |
| 271 | // CHECK-X86-64: store i32 %[[new]], i32* %[[ptr]] |
| 272 | // CHECK-PPC64: define void @_ZN2N35write |
| 273 | // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| 274 | // CHECK-PPC64: %[[old:.*]] = load i32* %[[ptr]] |
| 275 | // CHECK-PPC64: %[[x_and:.*]] = and i32 %{{.*}}, 16777215 |
| 276 | // CHECK-PPC64: %[[x_shl:.*]] = shl i32 %[[x_and]], 8 |
| 277 | // CHECK-PPC64: %[[old_and:.*]] = and i32 %[[old]], 255 |
| 278 | // CHECK-PPC64: %[[new:.*]] = or i32 %[[old_and]], %[[x_shl]] |
| 279 | // CHECK-PPC64: store i32 %[[new]], i32* %[[ptr]] |
Chandler Carruth | 72d2dab | 2012-12-06 11:14:44 +0000 | [diff] [blame] | 280 | s->b = x; |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | namespace N4 { |
| 285 | // Do NOT widen loads and stores to bitfields into padding at the end of |
| 286 | // a class which might end up with members inside of it when inside a derived |
| 287 | // class. |
| 288 | struct Base { |
| 289 | virtual ~Base() {} |
| 290 | |
| 291 | unsigned b : 24; |
| 292 | }; |
| 293 | // Imagine some other translation unit introduces: |
| 294 | #if 0 |
| 295 | struct Derived : public Base { |
| 296 | char c; |
| 297 | }; |
| 298 | #endif |
| 299 | unsigned read(Base* s) { |
| 300 | // FIXME: We should widen this load as long as the function isn't being |
| 301 | // instrumented by thread-sanitizer. |
| 302 | // |
Chandler Carruth | ef8d516 | 2012-12-09 07:26:04 +0000 | [diff] [blame] | 303 | // CHECK-X86-64: define i32 @_ZN2N44read |
| 304 | // CHECK-X86-64: %[[gep:.*]] = getelementptr inbounds {{.*}}* %{{.*}}, i32 0, i32 1 |
| 305 | // CHECK-X86-64: %[[ptr:.*]] = bitcast [3 x i8]* %[[gep]] to i24* |
| 306 | // CHECK-X86-64: %[[val:.*]] = load i24* %[[ptr]] |
| 307 | // CHECK-X86-64: %[[ext:.*]] = zext i24 %[[val]] to i32 |
| 308 | // CHECK-X86-64: ret i32 %[[ext]] |
| 309 | // CHECK-PPC64: define zeroext i32 @_ZN2N44read |
| 310 | // CHECK-PPC64: %[[gep:.*]] = getelementptr inbounds {{.*}}* %{{.*}}, i32 0, i32 1 |
| 311 | // CHECK-PPC64: %[[ptr:.*]] = bitcast [3 x i8]* %[[gep]] to i24* |
| 312 | // CHECK-PPC64: %[[val:.*]] = load i24* %[[ptr]] |
| 313 | // CHECK-PPC64: %[[ext:.*]] = zext i24 %[[val]] to i32 |
| 314 | // CHECK-PPC64: ret i32 %[[ext]] |
Chandler Carruth | 72d2dab | 2012-12-06 11:14:44 +0000 | [diff] [blame] | 315 | return s->b; |
| 316 | } |
| 317 | void write(Base* s, unsigned x) { |
Chandler Carruth | ef8d516 | 2012-12-09 07:26:04 +0000 | [diff] [blame] | 318 | // CHECK-X86-64: define void @_ZN2N45write |
| 319 | // CHECK-X86-64: %[[gep:.*]] = getelementptr inbounds {{.*}}* %{{.*}}, i32 0, i32 1 |
| 320 | // CHECK-X86-64: %[[ptr:.*]] = bitcast [3 x i8]* %[[gep]] to i24* |
| 321 | // CHECK-X86-64: %[[new:.*]] = trunc i32 %{{.*}} to i24 |
| 322 | // CHECK-X86-64: store i24 %[[new]], i24* %[[ptr]] |
| 323 | // CHECK-PPC64: define void @_ZN2N45write |
| 324 | // CHECK-PPC64: %[[gep:.*]] = getelementptr inbounds {{.*}}* %{{.*}}, i32 0, i32 1 |
| 325 | // CHECK-PPC64: %[[ptr:.*]] = bitcast [3 x i8]* %[[gep]] to i24* |
| 326 | // CHECK-PPC64: %[[new:.*]] = trunc i32 %{{.*}} to i24 |
| 327 | // CHECK-PPC64: store i24 %[[new]], i24* %[[ptr]] |
Chandler Carruth | 72d2dab | 2012-12-06 11:14:44 +0000 | [diff] [blame] | 328 | s->b = x; |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | namespace N5 { |
| 333 | // Widen through padding at the end of a struct even if that struct |
| 334 | // participates in a union with another struct which has a separate field in |
| 335 | // that location. The reasoning is that if the operation is storing to that |
| 336 | // member of the union, it must be the active member, and thus we can write |
| 337 | // through the padding. If it is a load, it might be a load of a common |
| 338 | // prefix through a non-active member, but in such a case the extra bits |
| 339 | // loaded are masked off anyways. |
| 340 | union U { |
| 341 | struct X { unsigned b : 24; char c; } x; |
| 342 | struct Y { unsigned b : 24; } y; |
| 343 | }; |
| 344 | unsigned read(U* u) { |
Chandler Carruth | ef8d516 | 2012-12-09 07:26:04 +0000 | [diff] [blame] | 345 | // CHECK-X86-64: define i32 @_ZN2N54read |
| 346 | // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| 347 | // CHECK-X86-64: %[[val:.*]] = load i32* %[[ptr]] |
| 348 | // CHECK-X86-64: %[[and:.*]] = and i32 %[[val]], 16777215 |
| 349 | // CHECK-X86-64: ret i32 %[[and]] |
| 350 | // CHECK-PPC64: define zeroext i32 @_ZN2N54read |
| 351 | // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| 352 | // CHECK-PPC64: %[[val:.*]] = load i32* %[[ptr]] |
| 353 | // CHECK-PPC64: %[[shr:.*]] = lshr i32 %[[val]], 8 |
| 354 | // CHECK-PPC64: ret i32 %[[shr]] |
Chandler Carruth | 72d2dab | 2012-12-06 11:14:44 +0000 | [diff] [blame] | 355 | return u->y.b; |
| 356 | } |
| 357 | void write(U* u, unsigned x) { |
Chandler Carruth | ef8d516 | 2012-12-09 07:26:04 +0000 | [diff] [blame] | 358 | // CHECK-X86-64: define void @_ZN2N55write |
| 359 | // CHECK-X86-64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| 360 | // CHECK-X86-64: %[[old:.*]] = load i32* %[[ptr]] |
| 361 | // CHECK-X86-64: %[[x_and:.*]] = and i32 %{{.*}}, 16777215 |
| 362 | // CHECK-X86-64: %[[old_and:.*]] = and i32 %[[old]], -16777216 |
| 363 | // CHECK-X86-64: %[[new:.*]] = or i32 %[[old_and]], %[[x_and]] |
| 364 | // CHECK-X86-64: store i32 %[[new]], i32* %[[ptr]] |
| 365 | // CHECK-PPC64: define void @_ZN2N55write |
| 366 | // CHECK-PPC64: %[[ptr:.*]] = bitcast %{{.*}}* %{{.*}} to i32* |
| 367 | // CHECK-PPC64: %[[old:.*]] = load i32* %[[ptr]] |
| 368 | // CHECK-PPC64: %[[x_and:.*]] = and i32 %{{.*}}, 16777215 |
| 369 | // CHECK-PPC64: %[[x_shl:.*]] = shl i32 %[[x_and]], 8 |
| 370 | // CHECK-PPC64: %[[old_and:.*]] = and i32 %[[old]], 255 |
| 371 | // CHECK-PPC64: %[[new:.*]] = or i32 %[[old_and]], %[[x_shl]] |
| 372 | // CHECK-PPC64: store i32 %[[new]], i32* %[[ptr]] |
Chandler Carruth | 72d2dab | 2012-12-06 11:14:44 +0000 | [diff] [blame] | 373 | u->y.b = x; |
| 374 | } |
| 375 | } |
| 376 | |
| 377 | namespace N6 { |
| 378 | // Zero-length bitfields partition the memory locations of bitfields for the |
| 379 | // purposes of the memory model. That means stores must not span zero-length |
| 380 | // bitfields and loads may only span them when we are not instrumenting with |
| 381 | // thread sanitizer. |
| 382 | // FIXME: We currently don't widen loads even without thread sanitizer, even |
| 383 | // though we could. |
| 384 | struct S { |
| 385 | unsigned b1 : 24; |
| 386 | unsigned char : 0; |
| 387 | unsigned char b2 : 8; |
| 388 | }; |
| 389 | unsigned read(S* s) { |
Chandler Carruth | ef8d516 | 2012-12-09 07:26:04 +0000 | [diff] [blame] | 390 | // CHECK-X86-64: define i32 @_ZN2N64read |
| 391 | // CHECK-X86-64: %[[ptr1:.*]] = bitcast {{.*}}* %{{.*}} to i24* |
| 392 | // CHECK-X86-64: %[[val1:.*]] = load i24* %[[ptr1]] |
| 393 | // CHECK-X86-64: %[[ext1:.*]] = zext i24 %[[val1]] to i32 |
| 394 | // CHECK-X86-64: %[[ptr2:.*]] = getelementptr inbounds {{.*}}* %{{.*}}, i32 0, i32 1 |
| 395 | // CHECK-X86-64: %[[val2:.*]] = load i8* %[[ptr2]] |
| 396 | // CHECK-X86-64: %[[ext2:.*]] = zext i8 %[[val2]] to i32 |
| 397 | // CHECK-X86-64: %[[add:.*]] = add nsw i32 %[[ext1]], %[[ext2]] |
| 398 | // CHECK-X86-64: ret i32 %[[add]] |
| 399 | // CHECK-PPC64: define zeroext i32 @_ZN2N64read |
| 400 | // CHECK-PPC64: %[[ptr1:.*]] = bitcast {{.*}}* %{{.*}} to i24* |
| 401 | // CHECK-PPC64: %[[val1:.*]] = load i24* %[[ptr1]] |
| 402 | // CHECK-PPC64: %[[ext1:.*]] = zext i24 %[[val1]] to i32 |
| 403 | // CHECK-PPC64: %[[ptr2:.*]] = getelementptr inbounds {{.*}}* %{{.*}}, i32 0, i32 1 |
| 404 | // CHECK-PPC64: %[[val2:.*]] = load i8* %[[ptr2]] |
| 405 | // CHECK-PPC64: %[[ext2:.*]] = zext i8 %[[val2]] to i32 |
| 406 | // CHECK-PPC64: %[[add:.*]] = add nsw i32 %[[ext1]], %[[ext2]] |
| 407 | // CHECK-PPC64: ret i32 %[[add]] |
Chandler Carruth | 72d2dab | 2012-12-06 11:14:44 +0000 | [diff] [blame] | 408 | return s->b1 + s->b2; |
| 409 | } |
| 410 | void write(S* s, unsigned x) { |
Chandler Carruth | ef8d516 | 2012-12-09 07:26:04 +0000 | [diff] [blame] | 411 | // CHECK-X86-64: define void @_ZN2N65write |
| 412 | // CHECK-X86-64: %[[ptr1:.*]] = bitcast {{.*}}* %{{.*}} to i24* |
| 413 | // CHECK-X86-64: %[[new1:.*]] = trunc i32 %{{.*}} to i24 |
| 414 | // CHECK-X86-64: store i24 %[[new1]], i24* %[[ptr1]] |
| 415 | // CHECK-X86-64: %[[new2:.*]] = trunc i32 %{{.*}} to i8 |
| 416 | // CHECK-X86-64: %[[ptr2:.*]] = getelementptr inbounds {{.*}}* %{{.*}}, i32 0, i32 1 |
| 417 | // CHECK-X86-64: store i8 %[[new2]], i8* %[[ptr2]] |
| 418 | // CHECK-PPC64: define void @_ZN2N65write |
| 419 | // CHECK-PPC64: %[[ptr1:.*]] = bitcast {{.*}}* %{{.*}} to i24* |
| 420 | // CHECK-PPC64: %[[new1:.*]] = trunc i32 %{{.*}} to i24 |
| 421 | // CHECK-PPC64: store i24 %[[new1]], i24* %[[ptr1]] |
| 422 | // CHECK-PPC64: %[[new2:.*]] = trunc i32 %{{.*}} to i8 |
| 423 | // CHECK-PPC64: %[[ptr2:.*]] = getelementptr inbounds {{.*}}* %{{.*}}, i32 0, i32 1 |
| 424 | // CHECK-PPC64: store i8 %[[new2]], i8* %[[ptr2]] |
Chandler Carruth | 72d2dab | 2012-12-06 11:14:44 +0000 | [diff] [blame] | 425 | s->b1 = x; |
| 426 | s->b2 = x; |
| 427 | } |
| 428 | } |