1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt -S -passes=loop-predication < %s 2>&1 | FileCheck %s 3; RUN: opt -S -aa-pipeline=basic-aa -passes='require<aa>,require<scalar-evolution>,loop-mssa(loop-predication)' -verify-memoryssa < %s 2>&1 | FileCheck %s 4 5declare void @llvm.experimental.guard(i1, ...) 6 7@UNKNOWN = external global i1 8 9define i32 @neg_length_variant(ptr %array, ptr %length, i32 %n) { 10; CHECK-LABEL: @neg_length_variant( 11; CHECK-NEXT: entry: 12; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[N:%.*]], 0 13; CHECK-NEXT: br i1 [[TMP5]], label [[EXIT:%.*]], label [[LOOP_PREHEADER:%.*]] 14; CHECK: loop.preheader: 15; CHECK-NEXT: br label [[LOOP:%.*]] 16; CHECK: loop: 17; CHECK-NEXT: [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] 18; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] 19; CHECK-NEXT: [[UNKNOWN:%.*]] = load volatile i1, ptr @UNKNOWN, align 1 20; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[UNKNOWN]]) [ "deopt"() ] 21; CHECK-NEXT: [[LEN:%.*]] = load i32, ptr [[LENGTH:%.*]], align 4 22; CHECK-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[LEN]] 23; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[WITHIN_BOUNDS]], i32 9) [ "deopt"() ] 24; CHECK-NEXT: [[I_I64:%.*]] = zext i32 [[I]] to i64 25; CHECK-NEXT: [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]] 26; CHECK-NEXT: [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4 27; CHECK-NEXT: [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]] 28; CHECK-NEXT: [[I_NEXT]] = add nuw i32 [[I]], 1 29; CHECK-NEXT: [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[N]] 30; CHECK-NEXT: br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] 31; CHECK: exit.loopexit: 32; CHECK-NEXT: [[LOOP_ACC_NEXT_LCSSA:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[LOOP]] ] 33; CHECK-NEXT: br label [[EXIT]] 34; CHECK: exit: 35; CHECK-NEXT: [[RESULT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_ACC_NEXT_LCSSA]], [[EXIT_LOOPEXIT]] ] 36; CHECK-NEXT: ret i32 [[RESULT]] 37; 38entry: 39 %tmp5 = icmp eq i32 %n, 0 40 br i1 %tmp5, label %exit, label %loop.preheader 41 42loop.preheader: 43 br label %loop 44 45loop: 46 %loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ] 47 %i = phi i32 [ %i.next, %loop ], [ 0, %loop.preheader ] 48 %unknown = load volatile i1, ptr @UNKNOWN 49 call void (i1, ...) @llvm.experimental.guard(i1 %unknown) [ "deopt"() ] 50 %len = load i32, ptr %length, align 4 51 %within.bounds = icmp ult i32 %i, %len 52 call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ] 53 54 %i.i64 = zext i32 %i to i64 55 %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64 56 %array.i = load i32, ptr %array.i.ptr, align 4 57 %loop.acc.next = add i32 %loop.acc, %array.i 58 59 %i.next = add nuw i32 %i, 1 60 %continue = icmp ult i32 %i.next, %n 61 br i1 %continue, label %loop, label %exit 62 63exit: 64 %result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ] 65 ret i32 %result 66} 67 68define i32 @invariant_load_guard_limit(ptr %array, ptr %length, i32 %n) { 69; CHECK-LABEL: @invariant_load_guard_limit( 70; CHECK-NEXT: entry: 71; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[N:%.*]], 0 72; CHECK-NEXT: br i1 [[TMP5]], label [[EXIT:%.*]], label [[LOOP_PREHEADER:%.*]] 73; CHECK: loop.preheader: 74; CHECK-NEXT: br label [[LOOP:%.*]] 75; CHECK: loop: 76; CHECK-NEXT: [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] 77; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] 78; CHECK-NEXT: [[UNKNOWN:%.*]] = load volatile i1, ptr @UNKNOWN, align 1 79; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[UNKNOWN]]) [ "deopt"() ] 80; CHECK-NEXT: [[LEN:%.*]] = load i32, ptr [[LENGTH:%.*]], align 4, !invariant.load !0 81; CHECK-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[LEN]] 82; CHECK-NEXT: [[TMP0:%.*]] = icmp ule i32 [[N]], [[LEN]] 83; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i32 0, [[LEN]] 84; CHECK-NEXT: [[TMP2:%.*]] = and i1 [[TMP1]], [[TMP0]] 85; CHECK-NEXT: [[TMP3:%.*]] = freeze i1 [[TMP2]] 86; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[TMP3]], i32 9) [ "deopt"() ] 87; CHECK-NEXT: call void @llvm.assume(i1 [[WITHIN_BOUNDS]]) 88; CHECK-NEXT: [[I_I64:%.*]] = zext i32 [[I]] to i64 89; CHECK-NEXT: [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]] 90; CHECK-NEXT: [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4 91; CHECK-NEXT: [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]] 92; CHECK-NEXT: [[I_NEXT]] = add nuw i32 [[I]], 1 93; CHECK-NEXT: [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[N]] 94; CHECK-NEXT: br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] 95; CHECK: exit.loopexit: 96; CHECK-NEXT: [[LOOP_ACC_NEXT_LCSSA:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[LOOP]] ] 97; CHECK-NEXT: br label [[EXIT]] 98; CHECK: exit: 99; CHECK-NEXT: [[RESULT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_ACC_NEXT_LCSSA]], [[EXIT_LOOPEXIT]] ] 100; CHECK-NEXT: ret i32 [[RESULT]] 101; 102entry: 103 %tmp5 = icmp eq i32 %n, 0 104 br i1 %tmp5, label %exit, label %loop.preheader 105 106loop.preheader: 107 br label %loop 108 109loop: 110 %loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ] 111 %i = phi i32 [ %i.next, %loop ], [ 0, %loop.preheader ] 112 %unknown = load volatile i1, ptr @UNKNOWN 113 call void (i1, ...) @llvm.experimental.guard(i1 %unknown) [ "deopt"() ] 114 %len = load i32, ptr %length, align 4, !invariant.load !{} 115 %within.bounds = icmp ult i32 %i, %len 116 call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ] 117 118 %i.i64 = zext i32 %i to i64 119 %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64 120 %array.i = load i32, ptr %array.i.ptr, align 4 121 %loop.acc.next = add i32 %loop.acc, %array.i 122 123 %i.next = add nuw i32 %i, 1 124 %continue = icmp ult i32 %i.next, %n 125 br i1 %continue, label %loop, label %exit 126 127exit: 128 %result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ] 129 ret i32 %result 130} 131 132; Case where we have an invariant load, but it's not loading from a loop 133; invariant location. 134define i32 @neg_varying_invariant_load_op(ptr %array, ptr %lengths, i32 %n) { 135; CHECK-LABEL: @neg_varying_invariant_load_op( 136; CHECK-NEXT: entry: 137; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[N:%.*]], 0 138; CHECK-NEXT: br i1 [[TMP5]], label [[EXIT:%.*]], label [[LOOP_PREHEADER:%.*]] 139; CHECK: loop.preheader: 140; CHECK-NEXT: br label [[LOOP:%.*]] 141; CHECK: loop: 142; CHECK-NEXT: [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] 143; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] 144; CHECK-NEXT: [[UNKNOWN:%.*]] = load volatile i1, ptr @UNKNOWN, align 1 145; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[UNKNOWN]]) [ "deopt"() ] 146; CHECK-NEXT: [[LENGTH_ADDR:%.*]] = getelementptr i32, ptr [[LENGTHS:%.*]], i32 [[I]] 147; CHECK-NEXT: [[LEN:%.*]] = load i32, ptr [[LENGTH_ADDR]], align 4, !invariant.load !0 148; CHECK-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[LEN]] 149; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[WITHIN_BOUNDS]], i32 9) [ "deopt"() ] 150; CHECK-NEXT: [[I_I64:%.*]] = zext i32 [[I]] to i64 151; CHECK-NEXT: [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]] 152; CHECK-NEXT: [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4 153; CHECK-NEXT: [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]] 154; CHECK-NEXT: [[I_NEXT]] = add nuw i32 [[I]], 1 155; CHECK-NEXT: [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[N]] 156; CHECK-NEXT: br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] 157; CHECK: exit.loopexit: 158; CHECK-NEXT: [[LOOP_ACC_NEXT_LCSSA:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[LOOP]] ] 159; CHECK-NEXT: br label [[EXIT]] 160; CHECK: exit: 161; CHECK-NEXT: [[RESULT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_ACC_NEXT_LCSSA]], [[EXIT_LOOPEXIT]] ] 162; CHECK-NEXT: ret i32 [[RESULT]] 163; 164entry: 165 %tmp5 = icmp eq i32 %n, 0 166 br i1 %tmp5, label %exit, label %loop.preheader 167 168loop.preheader: 169 br label %loop 170 171loop: 172 %loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ] 173 %i = phi i32 [ %i.next, %loop ], [ 0, %loop.preheader ] 174 %unknown = load volatile i1, ptr @UNKNOWN 175 call void (i1, ...) @llvm.experimental.guard(i1 %unknown) [ "deopt"() ] 176 177 %length.addr = getelementptr i32, ptr %lengths, i32 %i 178 %len = load i32, ptr %length.addr, align 4, !invariant.load !{} 179 %within.bounds = icmp ult i32 %i, %len 180 call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ] 181 182 %i.i64 = zext i32 %i to i64 183 %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64 184 %array.i = load i32, ptr %array.i.ptr, align 4 185 %loop.acc.next = add i32 %loop.acc, %array.i 186 187 %i.next = add nuw i32 %i, 1 188 %continue = icmp ult i32 %i.next, %n 189 br i1 %continue, label %loop, label %exit 190 191exit: 192 %result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ] 193 ret i32 %result 194} 195 196; This is a case where moving the load which provides the limit for the latch 197; would be invalid, so we can't preform the tempting transform. Loading the 198; latch limit may fault since we could always fail the guard. 199define i32 @neg_invariant_load_latch_limit(ptr %array, ptr %length, i32 %n) { 200; CHECK-LABEL: @neg_invariant_load_latch_limit( 201; CHECK-NEXT: entry: 202; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[N:%.*]], 0 203; CHECK-NEXT: br i1 [[TMP5]], label [[EXIT:%.*]], label [[LOOP_PREHEADER:%.*]] 204; CHECK: loop.preheader: 205; CHECK-NEXT: br label [[LOOP:%.*]] 206; CHECK: loop: 207; CHECK-NEXT: [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] 208; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] 209; CHECK-NEXT: [[UNKNOWN:%.*]] = load volatile i1, ptr @UNKNOWN, align 1 210; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[UNKNOWN]]) [ "deopt"() ] 211; CHECK-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[N]] 212; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[WITHIN_BOUNDS]], i32 9) [ "deopt"() ] 213; CHECK-NEXT: [[I_I64:%.*]] = zext i32 [[I]] to i64 214; CHECK-NEXT: [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]] 215; CHECK-NEXT: [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4 216; CHECK-NEXT: [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]] 217; CHECK-NEXT: [[I_NEXT]] = add nuw i32 [[I]], 1 218; CHECK-NEXT: [[LEN:%.*]] = load i32, ptr [[LENGTH:%.*]], align 4, !invariant.load !0 219; CHECK-NEXT: [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[LEN]] 220; CHECK-NEXT: br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] 221; CHECK: exit.loopexit: 222; CHECK-NEXT: [[LOOP_ACC_NEXT_LCSSA:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[LOOP]] ] 223; CHECK-NEXT: br label [[EXIT]] 224; CHECK: exit: 225; CHECK-NEXT: [[RESULT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_ACC_NEXT_LCSSA]], [[EXIT_LOOPEXIT]] ] 226; CHECK-NEXT: ret i32 [[RESULT]] 227; 228entry: 229 %tmp5 = icmp eq i32 %n, 0 230 br i1 %tmp5, label %exit, label %loop.preheader 231 232loop.preheader: 233 br label %loop 234 235loop: 236 %loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ] 237 %i = phi i32 [ %i.next, %loop ], [ 0, %loop.preheader ] 238 %unknown = load volatile i1, ptr @UNKNOWN 239 call void (i1, ...) @llvm.experimental.guard(i1 %unknown) [ "deopt"() ] 240 %within.bounds = icmp ult i32 %i, %n 241 call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ] 242 243 %i.i64 = zext i32 %i to i64 244 %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64 245 %array.i = load i32, ptr %array.i.ptr, align 4 246 %loop.acc.next = add i32 %loop.acc, %array.i 247 248 %i.next = add nuw i32 %i, 1 249 %len = load i32, ptr %length, align 4, !invariant.load !{} 250 %continue = icmp ult i32 %i.next, %len 251 br i1 %continue, label %loop, label %exit 252 253exit: 254 %result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ] 255 ret i32 %result 256} 257 258define i32 @invariant_load_latch_limit(ptr %array, 259; CHECK-LABEL: @invariant_load_latch_limit( 260; CHECK-NEXT: entry: 261; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[N:%.*]], 0 262; CHECK-NEXT: br i1 [[TMP5]], label [[EXIT:%.*]], label [[LOOP_PREHEADER:%.*]] 263; CHECK: loop.preheader: 264; CHECK-NEXT: br label [[LOOP:%.*]] 265; CHECK: loop: 266; CHECK-NEXT: [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] 267; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] 268; CHECK-NEXT: [[UNKNOWN:%.*]] = load volatile i1, ptr @UNKNOWN, align 1 269; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[UNKNOWN]]) [ "deopt"() ] 270; CHECK-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[N]] 271; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[WITHIN_BOUNDS]], i32 9) [ "deopt"() ] 272; CHECK-NEXT: [[I_I64:%.*]] = zext i32 [[I]] to i64 273; CHECK-NEXT: [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]] 274; CHECK-NEXT: [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4 275; CHECK-NEXT: [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]] 276; CHECK-NEXT: [[I_NEXT]] = add nuw i32 [[I]], 1 277; CHECK-NEXT: [[LEN:%.*]] = load i32, ptr [[LENGTH:%.*]], align 4, !invariant.load !0 278; CHECK-NEXT: [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[LEN]] 279; CHECK-NEXT: br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] 280; CHECK: exit.loopexit: 281; CHECK-NEXT: [[LOOP_ACC_NEXT_LCSSA:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[LOOP]] ] 282; CHECK-NEXT: br label [[EXIT]] 283; CHECK: exit: 284; CHECK-NEXT: [[RESULT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_ACC_NEXT_LCSSA]], [[EXIT_LOOPEXIT]] ] 285; CHECK-NEXT: ret i32 [[RESULT]] 286; 287 ptr dereferenceable(4) %length, 288 i32 %n) { 289entry: 290 %tmp5 = icmp eq i32 %n, 0 291 br i1 %tmp5, label %exit, label %loop.preheader 292 293loop.preheader: 294 br label %loop 295 296loop: 297 %loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ] 298 %i = phi i32 [ %i.next, %loop ], [ 0, %loop.preheader ] 299 %unknown = load volatile i1, ptr @UNKNOWN 300 call void (i1, ...) @llvm.experimental.guard(i1 %unknown) [ "deopt"() ] 301 %within.bounds = icmp ult i32 %i, %n 302 call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ] 303 304 %i.i64 = zext i32 %i to i64 305 %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64 306 %array.i = load i32, ptr %array.i.ptr, align 4 307 %loop.acc.next = add i32 %loop.acc, %array.i 308 309 %i.next = add nuw i32 %i, 1 310 %len = load i32, ptr %length, align 4, !invariant.load !{} 311 %continue = icmp ult i32 %i.next, %len 312 br i1 %continue, label %loop, label %exit 313 314exit: 315 %result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ] 316 ret i32 %result 317} 318 319 320 321@Length = external constant i32 322 323define i32 @constant_memory(ptr %array, i32 %n) { 324; CHECK-LABEL: @constant_memory( 325; CHECK-NEXT: entry: 326; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[N:%.*]], 0 327; CHECK-NEXT: br i1 [[TMP5]], label [[EXIT:%.*]], label [[LOOP_PREHEADER:%.*]] 328; CHECK: loop.preheader: 329; CHECK-NEXT: br label [[LOOP:%.*]] 330; CHECK: loop: 331; CHECK-NEXT: [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] 332; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] 333; CHECK-NEXT: [[UNKNOWN:%.*]] = load volatile i1, ptr @UNKNOWN, align 1 334; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[UNKNOWN]]) [ "deopt"() ] 335; CHECK-NEXT: [[LEN:%.*]] = load i32, ptr @Length, align 4 336; CHECK-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], [[LEN]] 337; CHECK-NEXT: [[TMP0:%.*]] = icmp ule i32 [[N]], [[LEN]] 338; CHECK-NEXT: [[TMP1:%.*]] = icmp ult i32 0, [[LEN]] 339; CHECK-NEXT: [[TMP2:%.*]] = and i1 [[TMP1]], [[TMP0]] 340; CHECK-NEXT: [[TMP3:%.*]] = freeze i1 [[TMP2]] 341; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[TMP3]], i32 9) [ "deopt"() ] 342; CHECK-NEXT: call void @llvm.assume(i1 [[WITHIN_BOUNDS]]) 343; CHECK-NEXT: [[I_I64:%.*]] = zext i32 [[I]] to i64 344; CHECK-NEXT: [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]] 345; CHECK-NEXT: [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4 346; CHECK-NEXT: [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]] 347; CHECK-NEXT: [[I_NEXT]] = add nuw i32 [[I]], 1 348; CHECK-NEXT: [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[N]] 349; CHECK-NEXT: br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] 350; CHECK: exit.loopexit: 351; CHECK-NEXT: [[LOOP_ACC_NEXT_LCSSA:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[LOOP]] ] 352; CHECK-NEXT: br label [[EXIT]] 353; CHECK: exit: 354; CHECK-NEXT: [[RESULT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_ACC_NEXT_LCSSA]], [[EXIT_LOOPEXIT]] ] 355; CHECK-NEXT: ret i32 [[RESULT]] 356; 357entry: 358 %tmp5 = icmp eq i32 %n, 0 359 br i1 %tmp5, label %exit, label %loop.preheader 360 361loop.preheader: 362 br label %loop 363 364loop: 365 %loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ] 366 %i = phi i32 [ %i.next, %loop ], [ 0, %loop.preheader ] 367 %unknown = load volatile i1, ptr @UNKNOWN 368 call void (i1, ...) @llvm.experimental.guard(i1 %unknown) [ "deopt"() ] 369 %len = load i32, ptr @Length, align 4 370 %within.bounds = icmp ult i32 %i, %len 371 call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ] 372 373 %i.i64 = zext i32 %i to i64 374 %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64 375 %array.i = load i32, ptr %array.i.ptr, align 4 376 %loop.acc.next = add i32 %loop.acc, %array.i 377 378 %i.next = add nuw i32 %i, 1 379 %continue = icmp ult i32 %i.next, %n 380 br i1 %continue, label %loop, label %exit 381 382exit: 383 %result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ] 384 ret i32 %result 385} 386 387define i32 @constant_length(ptr %array, i32 %n) { 388; CHECK-LABEL: @constant_length( 389; CHECK-NEXT: entry: 390; CHECK-NEXT: [[TMP5:%.*]] = icmp eq i32 [[N:%.*]], 0 391; CHECK-NEXT: br i1 [[TMP5]], label [[EXIT:%.*]], label [[LOOP_PREHEADER:%.*]] 392; CHECK: loop.preheader: 393; CHECK-NEXT: [[TMP0:%.*]] = icmp ule i32 [[N]], 20 394; CHECK-NEXT: [[TMP1:%.*]] = and i1 true, [[TMP0]] 395; CHECK-NEXT: [[TMP2:%.*]] = freeze i1 [[TMP1]] 396; CHECK-NEXT: br label [[LOOP:%.*]] 397; CHECK: loop: 398; CHECK-NEXT: [[LOOP_ACC:%.*]] = phi i32 [ [[LOOP_ACC_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] 399; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] 400; CHECK-NEXT: [[UNKNOWN:%.*]] = load volatile i1, ptr @UNKNOWN, align 1 401; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[UNKNOWN]]) [ "deopt"() ] 402; CHECK-NEXT: [[WITHIN_BOUNDS:%.*]] = icmp ult i32 [[I]], 20 403; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 [[TMP2]], i32 9) [ "deopt"() ] 404; CHECK-NEXT: call void @llvm.assume(i1 [[WITHIN_BOUNDS]]) 405; CHECK-NEXT: [[I_I64:%.*]] = zext i32 [[I]] to i64 406; CHECK-NEXT: [[ARRAY_I_PTR:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i64 [[I_I64]] 407; CHECK-NEXT: [[ARRAY_I:%.*]] = load i32, ptr [[ARRAY_I_PTR]], align 4 408; CHECK-NEXT: [[LOOP_ACC_NEXT]] = add i32 [[LOOP_ACC]], [[ARRAY_I]] 409; CHECK-NEXT: [[I_NEXT]] = add nuw i32 [[I]], 1 410; CHECK-NEXT: [[CONTINUE:%.*]] = icmp ult i32 [[I_NEXT]], [[N]] 411; CHECK-NEXT: br i1 [[CONTINUE]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] 412; CHECK: exit.loopexit: 413; CHECK-NEXT: [[LOOP_ACC_NEXT_LCSSA:%.*]] = phi i32 [ [[LOOP_ACC_NEXT]], [[LOOP]] ] 414; CHECK-NEXT: br label [[EXIT]] 415; CHECK: exit: 416; CHECK-NEXT: [[RESULT:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_ACC_NEXT_LCSSA]], [[EXIT_LOOPEXIT]] ] 417; CHECK-NEXT: ret i32 [[RESULT]] 418; 419entry: 420 %tmp5 = icmp eq i32 %n, 0 421 br i1 %tmp5, label %exit, label %loop.preheader 422 423loop.preheader: 424 br label %loop 425 426loop: 427 %loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ] 428 %i = phi i32 [ %i.next, %loop ], [ 0, %loop.preheader ] 429 %unknown = load volatile i1, ptr @UNKNOWN 430 call void (i1, ...) @llvm.experimental.guard(i1 %unknown) [ "deopt"() ] 431 %within.bounds = icmp ult i32 %i, 20 432 call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ] 433 434 %i.i64 = zext i32 %i to i64 435 %array.i.ptr = getelementptr inbounds i32, ptr %array, i64 %i.i64 436 %array.i = load i32, ptr %array.i.ptr, align 4 437 %loop.acc.next = add i32 %loop.acc, %array.i 438 439 %i.next = add nuw i32 %i, 1 440 %continue = icmp ult i32 %i.next, %n 441 br i1 %continue, label %loop, label %exit 442 443exit: 444 %result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ] 445 ret i32 %result 446} 447 448 449