John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 1 | // RUN: %clang_cc1 -Wno-unused-value -emit-llvm %s -o - | FileCheck %s |
| 2 | |
| 3 | // CHECK: @i = global [[INT:i[0-9]+]] 0 |
| 4 | volatile int i, j, k; |
| 5 | volatile int ar[5]; |
| 6 | volatile char c; |
| 7 | // CHECK: @ci = global [[CINT:%.*]] zeroinitializer |
| 8 | volatile _Complex int ci; |
| 9 | volatile struct S { |
| 10 | #ifdef __cplusplus |
| 11 | void operator =(volatile struct S&o) volatile; |
| 12 | #endif |
| 13 | int i; |
| 14 | } a, b; |
| 15 | |
| 16 | //void operator =(volatile struct S&o1, volatile struct S&o2) volatile; |
| 17 | int printf(const char *, ...); |
| 18 | |
| 19 | |
| 20 | // CHECK: define void @{{.*}}test |
| 21 | void test() { |
| 22 | |
| 23 | asm("nop"); // CHECK: call void asm |
| 24 | |
John McCall | 2a41637 | 2010-12-05 02:00:02 +0000 | [diff] [blame] | 25 | // should not load |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 26 | i; |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 27 | |
| 28 | (float)(ci); |
| 29 | // CHECK-NEXT: volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0) |
| 30 | // CHECK-NEXT: volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1) |
| 31 | // CHECK-NEXT: sitofp [[INT]] |
| 32 | |
| 33 | // These are not uses in C++: |
| 34 | // [expr.static.cast]p6: |
| 35 | // The lvalue-to-rvalue . . . conversions are not applied to the expression. |
| 36 | (void)ci; |
| 37 | (void)a; |
| 38 | |
| 39 | (void)(ci=ci); |
| 40 | // CHECK-NEXT: [[R:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0) |
| 41 | // CHECK-NEXT: [[I:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1) |
| 42 | // CHECK-NEXT: volatile store [[INT]] [[R]], [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0) |
| 43 | // CHECK-NEXT: volatile store [[INT]] [[I]], [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1) |
| 44 | |
| 45 | (void)(i=j); |
| 46 | // CHECK-NEXT: [[T:%.*]] = volatile load [[INT]]* @j |
| 47 | // CHECK-NEXT: volatile store [[INT]] [[T]], [[INT]]* @i |
| 48 | |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 49 | ci+=ci; |
| 50 | // CHECK-NEXT: [[R1:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0) |
| 51 | // CHECK-NEXT: [[I1:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1) |
| 52 | // CHECK-NEXT: [[R2:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0) |
| 53 | // CHECK-NEXT: [[I2:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1) |
| 54 | // Not sure why they're ordered this way. |
| 55 | // CHECK-NEXT: [[R:%.*]] = add [[INT]] [[R2]], [[R1]] |
| 56 | // CHECK-NEXT: [[I:%.*]] = add [[INT]] [[I2]], [[I1]] |
| 57 | // CHECK-NEXT: volatile store [[INT]] [[R]], [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0) |
| 58 | // CHECK-NEXT: volatile store [[INT]] [[I]], [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1) |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 59 | |
| 60 | // Note that C++ requires an extra volatile load over C from the LHS of the '+'. |
| 61 | (ci += ci) + ci; |
| 62 | // CHECK-NEXT: [[R1:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0) |
| 63 | // CHECK-NEXT: [[I1:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1) |
| 64 | // CHECK-NEXT: [[R2:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0) |
| 65 | // CHECK-NEXT: [[I2:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1) |
| 66 | // CHECK-NEXT: [[R:%.*]] = add [[INT]] [[R2]], [[R1]] |
| 67 | // CHECK-NEXT: [[I:%.*]] = add [[INT]] [[I2]], [[I1]] |
| 68 | // CHECK-NEXT: volatile store [[INT]] [[R]], [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0) |
| 69 | // CHECK-NEXT: volatile store [[INT]] [[I]], [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1) |
| 70 | // CHECK-NEXT: [[R1:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0) |
| 71 | // CHECK-NEXT: [[I1:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1) |
| 72 | // CHECK-NEXT: [[R2:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 0) |
| 73 | // CHECK-NEXT: [[I2:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1) |
| 74 | // These additions can be elided. |
| 75 | // CHECK-NEXT: add [[INT]] [[R1]], [[R2]] |
| 76 | // CHECK-NEXT: add [[INT]] [[I1]], [[I2]] |
| 77 | |
| 78 | asm("nop"); // CHECK-NEXT: call void asm |
| 79 | |
| 80 | // Extra volatile load in C++. |
| 81 | (i += j) + k; |
| 82 | // CHECK-NEXT: volatile load |
| 83 | // CHECK-NEXT: volatile load |
| 84 | // CHECK-NEXT: add nsw [[INT]] |
| 85 | // CHECK-NEXT: volatile store |
| 86 | // CHECK-NEXT: volatile load |
| 87 | // CHECK-NEXT: volatile load |
| 88 | // CHECK-NEXT: add nsw [[INT]] |
| 89 | |
| 90 | asm("nop"); // CHECK-NEXT: call void asm |
| 91 | |
| 92 | // Extra volatile load in C++. |
| 93 | (i += j) + 1; |
| 94 | // CHECK-NEXT: volatile load |
| 95 | // CHECK-NEXT: volatile load |
| 96 | // CHECK-NEXT: add nsw [[INT]] |
| 97 | // CHECK-NEXT: volatile store |
| 98 | // CHECK-NEXT: volatile load |
| 99 | // CHECK-NEXT: add nsw [[INT]] |
| 100 | |
| 101 | asm("nop"); // CHECK-NEXT: call void asm |
| 102 | |
| 103 | ci+ci; |
| 104 | // CHECK-NEXT: volatile load |
| 105 | // CHECK-NEXT: volatile load |
| 106 | // CHECK-NEXT: volatile load |
| 107 | // CHECK-NEXT: volatile load |
| 108 | // CHECK-NEXT: add [[INT]] |
| 109 | // CHECK-NEXT: add [[INT]] |
| 110 | |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 111 | __real i; |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 112 | |
| 113 | +ci; |
| 114 | // CHECK-NEXT: volatile load |
| 115 | // CHECK-NEXT: volatile load |
| 116 | |
| 117 | asm("nop"); // CHECK-NEXT: call void asm |
| 118 | |
| 119 | (void)(i=i); |
| 120 | // CHECK-NEXT: volatile load |
| 121 | // CHECK-NEXT: volatile store |
| 122 | |
| 123 | (float)(i=i); |
| 124 | // CHECK-NEXT: volatile load |
| 125 | // CHECK-NEXT: volatile store |
| 126 | // CHECK-NEXT: volatile load |
| 127 | // CHECK-NEXT: sitofp |
| 128 | |
| 129 | (void)i; |
| 130 | |
| 131 | i=i; |
| 132 | // CHECK-NEXT: volatile load |
| 133 | // CHECK-NEXT: volatile store |
| 134 | |
| 135 | // Extra volatile load in C++. |
| 136 | i=i=i; |
| 137 | // CHECK-NEXT: volatile load |
| 138 | // CHECK-NEXT: volatile store |
| 139 | // CHECK-NEXT: volatile load |
| 140 | // CHECK-NEXT: volatile store |
| 141 | |
| 142 | (void)__builtin_choose_expr(0, i=i, j=j); |
| 143 | // CHECK-NEXT: volatile load |
| 144 | // CHECK-NEXT: volatile store |
| 145 | |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 146 | k ? (i=i) : (j=j); |
| 147 | // CHECK-NEXT: volatile load |
| 148 | // CHECK-NEXT: icmp |
| 149 | // CHECK-NEXT: br i1 |
| 150 | // CHECK: volatile load |
| 151 | // CHECK-NEXT: volatile store |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 152 | // CHECK-NEXT: br label |
| 153 | // CHECK: volatile load |
| 154 | // CHECK-NEXT: volatile store |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 155 | // CHECK-NEXT: br label |
John McCall | 150b462 | 2011-01-26 04:00:11 +0000 | [diff] [blame^] | 156 | // CHECK: phi |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 157 | |
| 158 | (void)(i,(i=i)); |
| 159 | // CHECK-NEXT: volatile load |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 160 | // CHECK-NEXT: volatile store |
| 161 | |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 162 | i=i,k; |
| 163 | // CHECK-NEXT: volatile load [[INT]]* @i |
| 164 | // CHECK-NEXT: volatile store {{.*}}, [[INT]]* @i |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 165 | |
| 166 | (i=j,k=j); |
| 167 | // CHECK-NEXT: volatile load [[INT]]* @j |
| 168 | // CHECK-NEXT: volatile store {{.*}}, [[INT]]* @i |
| 169 | // CHECK-NEXT: volatile load [[INT]]* @j |
| 170 | // CHECK-NEXT: volatile store {{.*}}, [[INT]]* @k |
| 171 | |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 172 | (i=j,k); |
| 173 | // CHECK-NEXT: volatile load [[INT]]* @j |
| 174 | // CHECK-NEXT: volatile store {{.*}}, [[INT]]* @i |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 175 | |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 176 | (i,j); |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 177 | |
| 178 | // Extra load in C++. |
| 179 | i=c=k; |
| 180 | // CHECK-NEXT: volatile load |
| 181 | // CHECK-NEXT: trunc |
| 182 | // CHECK-NEXT: volatile store |
| 183 | // CHECK-NEXT: volatile load |
| 184 | // CHECK-NEXT: sext |
| 185 | // CHECK-NEXT: volatile store |
| 186 | |
| 187 | i+=k; |
| 188 | // CHECK-NEXT: volatile load |
| 189 | // CHECK-NEXT: volatile load |
| 190 | // CHECK-NEXT: add nsw [[INT]] |
| 191 | // CHECK-NEXT: volatile store |
| 192 | |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 193 | ci; |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 194 | |
| 195 | asm("nop"); // CHECK-NEXT: call void asm |
| 196 | |
| 197 | (int)ci; |
| 198 | // CHECK-NEXT: volatile load {{.*}} @ci, i32 0, i32 0 |
| 199 | // CHECK-NEXT: volatile load {{.*}} @ci, i32 0, i32 1 |
| 200 | |
| 201 | (bool)ci; |
| 202 | // CHECK-NEXT: volatile load {{.*}} @ci, i32 0, i32 0 |
| 203 | // CHECK-NEXT: volatile load {{.*}} @ci, i32 0, i32 1 |
| 204 | // CHECK-NEXT: icmp ne |
| 205 | // CHECK-NEXT: icmp ne |
| 206 | // CHECK-NEXT: or i1 |
| 207 | |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 208 | ci=ci; |
| 209 | // CHECK-NEXT: volatile load |
| 210 | // CHECK-NEXT: volatile load |
| 211 | // CHECK-NEXT: volatile store |
| 212 | // CHECK-NEXT: volatile store |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 213 | |
| 214 | asm("nop"); // CHECK-NEXT: call void asm |
| 215 | |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 216 | // Extra load in C++. |
| 217 | ci=ci=ci; |
| 218 | // CHECK-NEXT: volatile load |
| 219 | // CHECK-NEXT: volatile load |
| 220 | // CHECK-NEXT: volatile store |
| 221 | // CHECK-NEXT: volatile store |
| 222 | // CHECK-NEXT: volatile load |
| 223 | // CHECK-NEXT: volatile load |
| 224 | // CHECK-NEXT: volatile store |
| 225 | // CHECK-NEXT: volatile store |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 226 | |
| 227 | __imag ci = __imag ci = __imag ci; |
| 228 | // CHECK-NEXT: [[T:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1) |
| 229 | // CHECK-NEXT: volatile store [[INT]] [[T]], [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1) |
| 230 | // CHECK-NEXT: [[T:%.*]] = volatile load [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1) |
| 231 | // CHECK-NEXT: volatile store [[INT]] [[T]], [[INT]]* getelementptr inbounds ([[CINT]]* @ci, i32 0, i32 1) |
| 232 | |
| 233 | __real (i = j); |
| 234 | // CHECK-NEXT: volatile load |
| 235 | // CHECK-NEXT: volatile store |
| 236 | |
| 237 | __imag i; |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 238 | |
| 239 | // ============================================================ |
| 240 | // FIXME: Test cases we get wrong. |
| 241 | |
| 242 | // A use. We load all of a into a copy of a, then load i. gcc forgets to do |
| 243 | // the assignment. |
| 244 | // (a = a).i; |
| 245 | |
| 246 | // ============================================================ |
| 247 | // Test cases where we intentionally differ from gcc, due to suspected bugs in |
| 248 | // gcc. |
| 249 | |
| 250 | // Not a use. gcc forgets to do the assignment. |
| 251 | // CHECK-NEXT: call |
| 252 | ((a=a),a); |
| 253 | |
| 254 | // Not a use. gcc gets this wrong, it doesn't emit the copy! |
| 255 | // CHECK-NEXT: call |
| 256 | (void)(a=a); |
| 257 | |
| 258 | // Not a use. gcc got this wrong in 4.2 and omitted the side effects |
| 259 | // entirely, but it is fixed in 4.4.0. |
| 260 | __imag (i = j); |
| 261 | // CHECK-NEXT: volatile load |
| 262 | // CHECK-NEXT: volatile store |
| 263 | |
| 264 | // C++ does an extra load here. Note that we have to do full loads. |
| 265 | (float)(ci=ci); |
| 266 | // CHECK-NEXT: volatile load |
| 267 | // CHECK-NEXT: volatile load |
| 268 | // CHECK-NEXT: volatile store |
| 269 | // CHECK-NEXT: volatile store |
| 270 | // CHECK-NEXT: volatile load |
| 271 | // CHECK-NEXT: volatile load |
| 272 | // CHECK-NEXT: sitofp |
| 273 | |
| 274 | // Not a use, bug? gcc treats this as not a use, that's probably a |
| 275 | // bug due to tree folding ignoring volatile. |
| 276 | (int)(ci=ci); |
| 277 | // CHECK-NEXT: volatile load |
| 278 | // CHECK-NEXT: volatile load |
| 279 | // CHECK-NEXT: volatile store |
| 280 | // CHECK-NEXT: volatile store |
| 281 | // CHECK-NEXT: volatile load |
| 282 | // CHECK-NEXT: volatile load |
| 283 | |
| 284 | // A use. |
| 285 | (float)(i=i); |
| 286 | // CHECK-NEXT: volatile load |
| 287 | // CHECK-NEXT: volatile store |
| 288 | // CHECK-NEXT: volatile load |
| 289 | // CHECK-NEXT: sitofp |
| 290 | |
| 291 | // A use. gcc treats this as not a use, that's probably a bug due to tree |
| 292 | // folding ignoring volatile. |
| 293 | (int)(i=i); |
| 294 | // CHECK-NEXT: volatile load |
| 295 | // CHECK-NEXT: volatile store |
| 296 | // CHECK-NEXT: volatile load |
| 297 | |
| 298 | // A use. |
| 299 | -(i=j); |
| 300 | // CHECK-NEXT: volatile load |
| 301 | // CHECK-NEXT: volatile store |
| 302 | // CHECK-NEXT: volatile load |
| 303 | // CHECK-NEXT: sub |
| 304 | |
| 305 | // A use. gcc treats this a not a use, that's probably a bug due to tree |
| 306 | // folding ignoring volatile. |
| 307 | +(i=k); |
| 308 | // CHECK-NEXT: volatile load |
| 309 | // CHECK-NEXT: volatile store |
| 310 | // CHECK-NEXT: volatile load |
| 311 | |
| 312 | // A use. gcc treats this a not a use, that's probably a bug due to tree |
| 313 | // folding ignoring volatile. |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 314 | __real (ci=ci); |
| 315 | // CHECK-NEXT: volatile load |
| 316 | // CHECK-NEXT: volatile load |
| 317 | // CHECK-NEXT: volatile store |
| 318 | // CHECK-NEXT: volatile store |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 319 | |
| 320 | // A use. |
| 321 | i + 0; |
| 322 | // CHECK-NEXT: volatile load |
| 323 | // CHECK-NEXT: add |
| 324 | |
| 325 | // A use. |
| 326 | (i=j) + i; |
| 327 | // CHECK-NEXT: volatile load |
| 328 | // CHECK-NEXT: volatile store |
| 329 | // CHECK-NEXT: volatile load |
| 330 | // CHECK-NEXT: volatile load |
| 331 | // CHECK-NEXT: add |
| 332 | |
| 333 | // A use. gcc treats this as not a use, that's probably a bug due to tree |
| 334 | // folding ignoring volatile. |
| 335 | (i=j) + 0; |
| 336 | // CHECK-NEXT: volatile load |
| 337 | // CHECK-NEXT: volatile store |
| 338 | // CHECK-NEXT: volatile load |
| 339 | // CHECK-NEXT: add |
| 340 | |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 341 | (i,j)=k; |
| 342 | // CHECK-NEXT: volatile load [[INT]]* @k |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 343 | // CHECK-NEXT: volatile store {{.*}}, [[INT]]* @j |
| 344 | |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 345 | (j=k,i)=i; |
John McCall | cd940a1 | 2010-12-06 06:10:02 +0000 | [diff] [blame] | 346 | // CHECK-NEXT: volatile load [[INT]]* @i |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 347 | // CHECK-NEXT: volatile load [[INT]]* @k |
| 348 | // CHECK-NEXT: volatile store {{.*}}, [[INT]]* @j |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 349 | // CHECK-NEXT: volatile store {{.*}}, [[INT]]* @i |
John McCall | 2a41637 | 2010-12-05 02:00:02 +0000 | [diff] [blame] | 350 | |
| 351 | // CHECK-NEXT: ret void |
John McCall | 83ce9d4 | 2010-11-16 23:07:28 +0000 | [diff] [blame] | 352 | } |