1 ; Test the static branch probability heuristics for no-return functions. 2 ; RUN: opt < %s -analyze -branch-prob | FileCheck %s 3 ; RUN: opt < %s -passes='print<branch-prob>' --disable-output 2>&1 | FileCheck %s 4 5 declare void @g1() 6 declare void @g2() 7 declare void @g3() 8 declare void @g4() 9 declare i32 @g5() 10 11 define void @test1(i32 %a, i32 %b) { 12 entry: 13 br label %do.body 14 ; CHECK: edge entry -> do.body probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 15 16 do.body: 17 %i.0 = phi i32 [ 0, %entry ], [ %inc3, %do.end ] 18 call void @g1() 19 br label %do.body1 20 ; CHECK: edge do.body -> do.body1 probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 21 22 do.body1: 23 %j.0 = phi i32 [ 0, %do.body ], [ %inc, %do.body1 ] 24 call void @g2() 25 %inc = add nsw i32 %j.0, 1 26 %cmp = icmp slt i32 %inc, %b 27 br i1 %cmp, label %do.body1, label %do.end 28 ; CHECK: edge do.body1 -> do.body1 probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 29 ; CHECK: edge do.body1 -> do.end probability is 0x04000000 / 0x80000000 = 3.12% 30 31 do.end: 32 call void @g3() 33 %inc3 = add nsw i32 %i.0, 1 34 %cmp4 = icmp slt i32 %inc3, %a 35 br i1 %cmp4, label %do.body, label %do.end5 36 ; CHECK: edge do.end -> do.body probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 37 ; CHECK: edge do.end -> do.end5 probability is 0x04000000 / 0x80000000 = 3.12% 38 39 do.end5: 40 call void @g4() 41 ret void 42 } 43 44 define void @test2(i32 %a, i32 %b) { 45 entry: 46 %cmp9 = icmp sgt i32 %a, 0 47 br i1 %cmp9, label %for.body.lr.ph, label %for.end6 48 ; CHECK: edge entry -> for.body.lr.ph probability is 0x50000000 / 0x80000000 = 62.50% 49 ; CHECK: edge entry -> for.end6 probability is 0x30000000 / 0x80000000 = 37.50% 50 51 for.body.lr.ph: 52 %cmp27 = icmp sgt i32 %b, 0 53 br label %for.body 54 ; CHECK: edge for.body.lr.ph -> for.body probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 55 56 for.body: 57 %i.010 = phi i32 [ 0, %for.body.lr.ph ], [ %inc5, %for.end ] 58 call void @g1() 59 br i1 %cmp27, label %for.body3, label %for.end 60 ; CHECK: edge for.body -> for.body3 probability is 0x50000000 / 0x80000000 = 62.50% 61 ; CHECK: edge for.body -> for.end probability is 0x30000000 / 0x80000000 = 37.50% 62 63 for.body3: 64 %j.08 = phi i32 [ %inc, %for.body3 ], [ 0, %for.body ] 65 call void @g2() 66 %inc = add nsw i32 %j.08, 1 67 %exitcond = icmp eq i32 %inc, %b 68 br i1 %exitcond, label %for.end, label %for.body3 69 ; CHECK: edge for.body3 -> for.end probability is 0x04000000 / 0x80000000 = 3.12% 70 ; CHECK: edge for.body3 -> for.body3 probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 71 72 for.end: 73 call void @g3() 74 %inc5 = add nsw i32 %i.010, 1 75 %exitcond11 = icmp eq i32 %inc5, %a 76 br i1 %exitcond11, label %for.end6, label %for.body 77 ; CHECK: edge for.end -> for.end6 probability is 0x04000000 / 0x80000000 = 3.12% 78 ; CHECK: edge for.end -> for.body probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 79 80 for.end6: 81 call void @g4() 82 ret void 83 } 84 85 define void @test3(i32 %a, i32 %b, i32* %c) { 86 entry: 87 br label %do.body 88 ; CHECK: edge entry -> do.body probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 89 90 do.body: 91 %i.0 = phi i32 [ 0, %entry ], [ %inc4, %if.end ] 92 call void @g1() 93 %0 = load i32, i32* %c, align 4 94 %cmp = icmp slt i32 %0, 42 95 br i1 %cmp, label %do.body1, label %if.end 96 ; CHECK: edge do.body -> do.body1 probability is 0x40000000 / 0x80000000 = 50.00% 97 ; CHECK: edge do.body -> if.end probability is 0x40000000 / 0x80000000 = 50.00% 98 99 do.body1: 100 %j.0 = phi i32 [ %inc, %do.body1 ], [ 0, %do.body ] 101 call void @g2() 102 %inc = add nsw i32 %j.0, 1 103 %cmp2 = icmp slt i32 %inc, %b 104 br i1 %cmp2, label %do.body1, label %if.end 105 ; CHECK: edge do.body1 -> do.body1 probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 106 ; CHECK: edge do.body1 -> if.end probability is 0x04000000 / 0x80000000 = 3.12% 107 108 if.end: 109 call void @g3() 110 %inc4 = add nsw i32 %i.0, 1 111 %cmp5 = icmp slt i32 %inc4, %a 112 br i1 %cmp5, label %do.body, label %do.end6 113 ; CHECK: edge if.end -> do.body probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 114 ; CHECK: edge if.end -> do.end6 probability is 0x04000000 / 0x80000000 = 3.12% 115 116 do.end6: 117 call void @g4() 118 ret void 119 } 120 121 define void @test4(i32 %a, i32 %b, i32* %c) { 122 entry: 123 br label %do.body 124 ; CHECK: edge entry -> do.body probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 125 126 do.body: 127 %i.0 = phi i32 [ 0, %entry ], [ %inc4, %do.end ] 128 call void @g1() 129 %0 = load i32, i32* %c, align 4 130 %cmp = icmp slt i32 %0, 42 131 br i1 %cmp, label %return, label %do.body1 132 ; CHECK: edge do.body -> return probability is 0x04000000 / 0x80000000 = 3.12% 133 ; CHECK: edge do.body -> do.body1 probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 134 135 do.body1: 136 %j.0 = phi i32 [ %inc, %do.body1 ], [ 0, %do.body ] 137 call void @g2() 138 %inc = add nsw i32 %j.0, 1 139 %cmp2 = icmp slt i32 %inc, %b 140 br i1 %cmp2, label %do.body1, label %do.end 141 ; CHECK: edge do.body1 -> do.body1 probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 142 ; CHECK: edge do.body1 -> do.end probability is 0x04000000 / 0x80000000 = 3.12% 143 144 do.end: 145 call void @g3() 146 %inc4 = add nsw i32 %i.0, 1 147 %cmp5 = icmp slt i32 %inc4, %a 148 br i1 %cmp5, label %do.body, label %do.end6 149 ; CHECK: edge do.end -> do.body probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 150 ; CHECK: edge do.end -> do.end6 probability is 0x04000000 / 0x80000000 = 3.12% 151 152 do.end6: 153 call void @g4() 154 br label %return 155 ; CHECK: edge do.end6 -> return probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 156 157 return: 158 ret void 159 } 160 161 define void @test5(i32 %a, i32 %b, i32* %c) { 162 entry: 163 br label %do.body 164 ; CHECK: edge entry -> do.body probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 165 166 do.body: 167 %i.0 = phi i32 [ 0, %entry ], [ %inc4, %do.end ] 168 call void @g1() 169 br label %do.body1 170 ; CHECK: edge do.body -> do.body1 probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 171 172 do.body1: 173 %j.0 = phi i32 [ 0, %do.body ], [ %inc, %if.end ] 174 %0 = load i32, i32* %c, align 4 175 %cmp = icmp slt i32 %0, 42 176 br i1 %cmp, label %return, label %if.end 177 ; CHECK: edge do.body1 -> return probability is 0x04000000 / 0x80000000 = 3.12% 178 ; CHECK: edge do.body1 -> if.end probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 179 180 if.end: 181 call void @g2() 182 %inc = add nsw i32 %j.0, 1 183 %cmp2 = icmp slt i32 %inc, %b 184 br i1 %cmp2, label %do.body1, label %do.end 185 ; CHECK: edge if.end -> do.body1 probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 186 ; CHECK: edge if.end -> do.end probability is 0x04000000 / 0x80000000 = 3.12% 187 188 do.end: 189 call void @g3() 190 %inc4 = add nsw i32 %i.0, 1 191 %cmp5 = icmp slt i32 %inc4, %a 192 br i1 %cmp5, label %do.body, label %do.end6 193 ; CHECK: edge do.end -> do.body probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 194 ; CHECK: edge do.end -> do.end6 probability is 0x04000000 / 0x80000000 = 3.12% 195 196 do.end6: 197 call void @g4() 198 br label %return 199 ; CHECK: edge do.end6 -> return probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 200 201 return: 202 ret void 203 } 204 205 define void @test6(i32 %a, i32 %b, i32* %c) { 206 entry: 207 br label %do.body 208 ; CHECK: edge entry -> do.body probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 209 210 do.body: 211 %i.0 = phi i32 [ 0, %entry ], [ %inc4, %do.end ] 212 call void @g1() 213 br label %do.body1 214 ; CHECK: edge do.body -> do.body1 probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 215 216 do.body1: 217 %j.0 = phi i32 [ 0, %do.body ], [ %inc, %do.cond ] 218 call void @g2() 219 %0 = load i32, i32* %c, align 4 220 %cmp = icmp slt i32 %0, 42 221 br i1 %cmp, label %return, label %do.cond 222 ; CHECK: edge do.body1 -> return probability is 0x04000000 / 0x80000000 = 3.12% 223 ; CHECK: edge do.body1 -> do.cond probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 224 225 do.cond: 226 %inc = add nsw i32 %j.0, 1 227 %cmp2 = icmp slt i32 %inc, %b 228 br i1 %cmp2, label %do.body1, label %do.end 229 ; CHECK: edge do.cond -> do.body1 probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 230 ; CHECK: edge do.cond -> do.end probability is 0x04000000 / 0x80000000 = 3.12% 231 232 do.end: 233 call void @g3() 234 %inc4 = add nsw i32 %i.0, 1 235 %cmp5 = icmp slt i32 %inc4, %a 236 br i1 %cmp5, label %do.body, label %do.end6 237 ; CHECK: edge do.end -> do.body probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 238 ; CHECK: edge do.end -> do.end6 probability is 0x04000000 / 0x80000000 = 3.12% 239 240 do.end6: 241 call void @g4() 242 br label %return 243 ; CHECK: edge do.end6 -> return probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 244 245 return: 246 ret void 247 } 248 249 define void @test7(i32 %a, i32 %b, i32* %c) { 250 entry: 251 %cmp10 = icmp sgt i32 %a, 0 252 br i1 %cmp10, label %for.body.lr.ph, label %for.end7 253 ; CHECK: edge entry -> for.body.lr.ph probability is 0x50000000 / 0x80000000 = 62.50% 254 ; CHECK: edge entry -> for.end7 probability is 0x30000000 / 0x80000000 = 37.50% 255 256 for.body.lr.ph: 257 %cmp38 = icmp sgt i32 %b, 0 258 br label %for.body 259 ; CHECK: edge for.body.lr.ph -> for.body probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 260 261 for.body: 262 %i.011 = phi i32 [ 0, %for.body.lr.ph ], [ %inc6, %for.inc5 ] 263 %0 = load i32, i32* %c, align 4 264 %cmp1 = icmp eq i32 %0, %i.011 265 br i1 %cmp1, label %for.inc5, label %if.end 266 ; CHECK: edge for.body -> for.inc5 probability is 0x40000000 / 0x80000000 = 50.00% 267 ; CHECK: edge for.body -> if.end probability is 0x40000000 / 0x80000000 = 50.00% 268 269 if.end: 270 call void @g1() 271 br i1 %cmp38, label %for.body4, label %for.end 272 ; CHECK: edge if.end -> for.body4 probability is 0x50000000 / 0x80000000 = 62.50% 273 ; CHECK: edge if.end -> for.end probability is 0x30000000 / 0x80000000 = 37.50% 274 275 for.body4: 276 %j.09 = phi i32 [ %inc, %for.body4 ], [ 0, %if.end ] 277 call void @g2() 278 %inc = add nsw i32 %j.09, 1 279 %exitcond = icmp eq i32 %inc, %b 280 br i1 %exitcond, label %for.end, label %for.body4 281 ; CHECK: edge for.body4 -> for.end probability is 0x04000000 / 0x80000000 = 3.12% 282 ; CHECK: edge for.body4 -> for.body4 probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 283 284 for.end: 285 call void @g3() 286 br label %for.inc5 287 ; CHECK: edge for.end -> for.inc5 probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 288 289 for.inc5: 290 %inc6 = add nsw i32 %i.011, 1 291 %exitcond12 = icmp eq i32 %inc6, %a 292 br i1 %exitcond12, label %for.end7, label %for.body 293 ; CHECK: edge for.inc5 -> for.end7 probability is 0x04000000 / 0x80000000 = 3.12% 294 ; CHECK: edge for.inc5 -> for.body probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 295 296 for.end7: 297 call void @g4() 298 ret void 299 } 300 301 define void @test8(i32 %a, i32 %b, i32* %c) { 302 entry: 303 %cmp18 = icmp sgt i32 %a, 0 304 br i1 %cmp18, label %for.body.lr.ph, label %for.end15 305 ; CHECK: edge entry -> for.body.lr.ph probability is 0x50000000 / 0x80000000 = 62.50% 306 ; CHECK: edge entry -> for.end15 probability is 0x30000000 / 0x80000000 = 37.50% 307 308 for.body.lr.ph: 309 %cmp216 = icmp sgt i32 %b, 0 310 %arrayidx5 = getelementptr inbounds i32, i32* %c, i64 1 311 %arrayidx9 = getelementptr inbounds i32, i32* %c, i64 2 312 br label %for.body 313 ; CHECK: edge for.body.lr.ph -> for.body probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 314 315 for.body: 316 %i.019 = phi i32 [ 0, %for.body.lr.ph ], [ %inc14, %for.end ] 317 call void @g1() 318 br i1 %cmp216, label %for.body3, label %for.end 319 ; CHECK: edge for.body -> for.body3 probability is 0x50000000 / 0x80000000 = 62.50% 320 ; CHECK: edge for.body -> for.end probability is 0x30000000 / 0x80000000 = 37.50% 321 322 for.body3: 323 %j.017 = phi i32 [ 0, %for.body ], [ %inc, %for.inc ] 324 %0 = load i32, i32* %c, align 4 325 %cmp4 = icmp eq i32 %0, %j.017 326 br i1 %cmp4, label %for.inc, label %if.end 327 ; CHECK: edge for.body3 -> for.inc probability is 0x40000000 / 0x80000000 = 50.00% 328 ; CHECK: edge for.body3 -> if.end probability is 0x40000000 / 0x80000000 = 50.00% 329 330 if.end: 331 %1 = load i32, i32* %arrayidx5, align 4 332 %cmp6 = icmp eq i32 %1, %j.017 333 br i1 %cmp6, label %for.inc, label %if.end8 334 ; CHECK: edge if.end -> for.inc probability is 0x40000000 / 0x80000000 = 50.00% 335 ; CHECK: edge if.end -> if.end8 probability is 0x40000000 / 0x80000000 = 50.00% 336 337 if.end8: 338 %2 = load i32, i32* %arrayidx9, align 4 339 %cmp10 = icmp eq i32 %2, %j.017 340 br i1 %cmp10, label %for.inc, label %if.end12 341 ; CHECK: edge if.end8 -> for.inc probability is 0x40000000 / 0x80000000 = 50.00% 342 ; CHECK: edge if.end8 -> if.end12 probability is 0x40000000 / 0x80000000 = 50.00% 343 344 if.end12: 345 call void @g2() 346 br label %for.inc 347 ; CHECK: edge if.end12 -> for.inc probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 348 349 for.inc: 350 %inc = add nsw i32 %j.017, 1 351 %exitcond = icmp eq i32 %inc, %b 352 br i1 %exitcond, label %for.end, label %for.body3 353 ; CHECK: edge for.inc -> for.end probability is 0x04000000 / 0x80000000 = 3.12% 354 ; CHECK: edge for.inc -> for.body3 probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 355 356 for.end: 357 call void @g3() 358 %inc14 = add nsw i32 %i.019, 1 359 %exitcond20 = icmp eq i32 %inc14, %a 360 br i1 %exitcond20, label %for.end15, label %for.body 361 ; CHECK: edge for.end -> for.end15 probability is 0x04000000 / 0x80000000 = 3.12% 362 ; CHECK: edge for.end -> for.body probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 363 364 for.end15: 365 call void @g4() 366 ret void 367 } 368 369 ; Test that an irreducible loop gets heavily weighted back-edges. 370 define void @test9(i32 %i, i32 %x, i32 %c) { 371 entry: 372 %tobool = icmp eq i32 %c, 0 373 br i1 %tobool, label %if.end, label %midloop 374 ; CHECK: edge entry -> if.end probability is 0x30000000 / 0x80000000 = 37.50% 375 ; CHECK: edge entry -> midloop probability is 0x50000000 / 0x80000000 = 62.50% 376 377 if.end: 378 br label %for.cond 379 ; CHECK: edge if.end -> for.cond probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 380 381 for.cond: 382 %i.addr.0 = phi i32 [ %inc, %for.inc ], [ 0, %if.end ] 383 %cmp = icmp slt i32 %i.addr.0, %x 384 br i1 %cmp, label %midloop, label %end 385 ; CHECK: edge for.cond -> midloop probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 386 ; CHECK: edge for.cond -> end probability is 0x04000000 / 0x80000000 = 3.12% 387 388 midloop: 389 %i.addr.1 = phi i32 [ %i, %entry ], [ %i.addr.0, %for.cond ] 390 %call1 = call i32 @g5() 391 %tobool2 = icmp eq i32 %call1, 0 392 br i1 %tobool2, label %for.inc, label %end 393 ; CHECK: edge midloop -> for.inc probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 394 ; CHECK: edge midloop -> end probability is 0x04000000 / 0x80000000 = 3.12% 395 396 for.inc: 397 %inc = add nsw i32 %i.addr.1, 1 398 br label %for.cond 399 ; CHECK: edge for.inc -> for.cond probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 400 401 end: 402 ret void 403 } 404 405 ; Check that the for.body -> if.then edge is considered unlikely due to making 406 ; the if-condition false for the next iteration of the loop. 407 define i32 @test10(i32 %n, i32* %p) { 408 entry: 409 br label %for.cond 410 ; CHECK: edge entry -> for.cond probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 411 412 for.cond: 413 %count.0 = phi i32 [ 0, %entry ], [ %count.1, %for.inc ] 414 %sum.0 = phi i32 [ 0, %entry ], [ %sum.1, %for.inc ] 415 %i.0 = phi i32 [ 0, %entry ], [ %inc3, %for.inc ] 416 %cmp = icmp slt i32 %i.0, %n 417 br i1 %cmp, label %for.body, label %for.cond.cleanup 418 ; CHECK: edge for.cond -> for.body probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 419 ; CHECK: edge for.cond -> for.cond.cleanup probability is 0x04000000 / 0x80000000 = 3.12% 420 421 for.cond.cleanup: 422 ret i32 %sum.0 423 424 for.body: 425 %arrayidx = getelementptr inbounds i32, i32* %p, i32 %i.0 426 %0 = load i32, i32* %arrayidx, align 4 427 %add = add nsw i32 %sum.0, %0 428 %inc = add nsw i32 %count.0, 1 429 %cmp1 = icmp sgt i32 %count.0, 6 430 br i1 %cmp1, label %if.then, label %for.inc 431 ; CHECK: edge for.body -> if.then probability is 0x2aaaaaab / 0x80000000 = 33.33% 432 ; CHECK: edge for.body -> for.inc probability is 0x55555555 / 0x80000000 = 66.67% 433 434 if.then: 435 store i32 %add, i32* %arrayidx, align 4 436 br label %for.inc 437 ; CHECK: edge if.then -> for.inc probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 438 439 for.inc: 440 %count.1 = phi i32 [ 0, %if.then ], [ %inc, %for.body ] 441 %sum.1 = phi i32 [ 0, %if.then ], [ %add, %for.body ] 442 %inc3 = add nsw i32 %i.0, 1 443 br label %for.cond 444 ; CHECK: edge for.inc -> for.cond probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 445 } 446 447 ; Each successor to for.body makes itself not be taken in the next iteration, so 448 ; both should be equally likely 449 define i32 @test11(i32 %n, i32* %p) { 450 entry: 451 br label %for.cond 452 ; CHECK: edge entry -> for.cond probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 453 454 for.cond: 455 %flip.0 = phi i32 [ 0, %entry ], [ %flip.1, %for.inc ] 456 %sum.0 = phi i32 [ 0, %entry ], [ %sum.1, %for.inc ] 457 %i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ] 458 %cmp = icmp slt i32 %i.0, %n 459 br i1 %cmp, label %for.body, label %for.cond.cleanup 460 ; CHECK: edge for.cond -> for.body probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 461 ; CHECK: edge for.cond -> for.cond.cleanup probability is 0x04000000 / 0x80000000 = 3.12% 462 463 for.cond.cleanup: 464 ret i32 %sum.0 465 466 for.body: 467 %tobool = icmp eq i32 %flip.0, 0 468 %arrayidx1 = getelementptr inbounds i32, i32* %p, i32 %i.0 469 %0 = load i32, i32* %arrayidx1, align 4 470 br i1 %tobool, label %if.else, label %if.then 471 ; CHECK: edge for.body -> if.else probability is 0x40000000 / 0x80000000 = 50.00% 472 ; CHECK: edge for.body -> if.then probability is 0x40000000 / 0x80000000 = 50.00% 473 474 if.then: 475 %add = add nsw i32 %0, %sum.0 476 store i32 %add, i32* %arrayidx1, align 4 477 br label %for.inc 478 ; CHECK: edge if.then -> for.inc probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 479 480 if.else: 481 %add2 = add nsw i32 %sum.0, %0 482 br label %for.inc 483 ; CHECK: edge if.else -> for.inc probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 484 485 for.inc: 486 %flip.1 = phi i32 [ 0, %if.then ], [ 1, %if.else ] 487 %sum.1 = phi i32 [ %sum.0, %if.then ], [ %add2, %if.else ] 488 %inc = add nsw i32 %i.0, 1 489 br label %for.cond 490 ; CHECK: edge for.inc -> for.cond probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 491 } 492 493 ; The loop heuristic should not overwrite the invoke heuristic. The unwind destination 494 ; of an invoke should be considered VERY rare even in a loop. 495 define void @test12(i32 %a) personality i8 0 { 496 entry: 497 br label %loop 498 ; CHECK: edge entry -> loop probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] 499 500 loop: 501 %i.0 = phi i32 [ 0, %entry ], [ %inc, %invoke.cont ] 502 invoke i32 @InvokeCall() 503 to label %invoke.cont unwind label %lpad 504 ; CHECK: edge loop -> invoke.cont probability is 0x7ffff800 / 0x80000000 = 100.00% [HOT edge] 505 ; CHECK: edge loop -> lpad probability is 0x00000800 / 0x80000000 = 0.00% 506 507 invoke.cont: 508 %inc = add nsw i32 %i.0, 1 509 %cmp = icmp slt i32 %inc, %a 510 br i1 %cmp, label %loop, label %exit 511 ; CHECK: edge invoke.cont -> loop probability is 0x7c000000 / 0x80000000 = 96.88% [HOT edge] 512 ; CHECK: edge invoke.cont -> exit probability is 0x04000000 / 0x80000000 = 3.12% 513 514 lpad: 515 %ll = landingpad { i8*, i32 } 516 cleanup 517 br label %exit 518 519 exit: 520 ret void 521 } 522 523 declare i32 @InvokeCall() 524
