1target datalayout = "e-p:64:64:64-p1:16:16:16-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128" 2 3; Optimize subtracts. 4; 5; RUN: opt < %s -instcombine -S | FileCheck %s 6 7define i32 @test1(i32 %A) { 8 %B = sub i32 %A, %A 9 ret i32 %B 10; CHECK-LABEL: @test1( 11; CHECK: ret i32 0 12} 13 14define i32 @test2(i32 %A) { 15 %B = sub i32 %A, 0 16 ret i32 %B 17; CHECK-LABEL: @test2( 18; CHECK: ret i32 %A 19} 20 21define i32 @test3(i32 %A) { 22 %B = sub i32 0, %A 23 %C = sub i32 0, %B 24 ret i32 %C 25; CHECK-LABEL: @test3( 26; CHECK: ret i32 %A 27} 28 29define i32 @test4(i32 %A, i32 %x) { 30 %B = sub i32 0, %A 31 %C = sub i32 %x, %B 32 ret i32 %C 33; CHECK-LABEL: @test4( 34; CHECK: %C = add i32 %x, %A 35; CHECK: ret i32 %C 36} 37 38define i32 @test5(i32 %A, i32 %B, i32 %C) { 39 %D = sub i32 %B, %C 40 %E = sub i32 %A, %D 41 ret i32 %E 42; CHECK-LABEL: @test5( 43; CHECK: %D1 = sub i32 %C, %B 44; CHECK: %E = add 45; CHECK: ret i32 %E 46} 47 48define i32 @test6(i32 %A, i32 %B) { 49 %C = and i32 %A, %B 50 %D = sub i32 %A, %C 51 ret i32 %D 52; CHECK-LABEL: @test6( 53; CHECK-NEXT: xor i32 %B, -1 54; CHECK-NEXT: %D = and i32 55; CHECK-NEXT: ret i32 %D 56} 57 58define i32 @test7(i32 %A) { 59 %B = sub i32 -1, %A 60 ret i32 %B 61; CHECK-LABEL: @test7( 62; CHECK: %B = xor i32 %A, -1 63; CHECK: ret i32 %B 64} 65 66define i32 @test8(i32 %A) { 67 %B = mul i32 9, %A 68 %C = sub i32 %B, %A 69 ret i32 %C 70; CHECK-LABEL: @test8( 71; CHECK: %C = shl i32 %A, 3 72; CHECK: ret i32 %C 73} 74 75define i32 @test9(i32 %A) { 76 %B = mul i32 3, %A 77 %C = sub i32 %A, %B 78 ret i32 %C 79; CHECK-LABEL: @test9( 80; CHECK: %C = mul i32 %A, -2 81; CHECK: ret i32 %C 82} 83 84define i32 @test10(i32 %A, i32 %B) { 85 %C = sub i32 0, %A 86 %D = sub i32 0, %B 87 %E = mul i32 %C, %D 88 ret i32 %E 89; CHECK-LABEL: @test10( 90; CHECK: %E = mul i32 %A, %B 91; CHECK: ret i32 %E 92} 93 94define i32 @test10a(i32 %A) { 95 %C = sub i32 0, %A 96 %E = mul i32 %C, 7 97 ret i32 %E 98; CHECK-LABEL: @test10a( 99; CHECK: %E = mul i32 %A, -7 100; CHECK: ret i32 %E 101} 102 103define i1 @test11(i8 %A, i8 %B) { 104 %C = sub i8 %A, %B 105 %cD = icmp ne i8 %C, 0 106 ret i1 %cD 107; CHECK-LABEL: @test11( 108; CHECK: %cD = icmp ne i8 %A, %B 109; CHECK: ret i1 %cD 110} 111 112define i32 @test12(i32 %A) { 113 %B = ashr i32 %A, 31 114 %C = sub i32 0, %B 115 ret i32 %C 116; CHECK-LABEL: @test12( 117; CHECK: %C = lshr i32 %A, 31 118; CHECK: ret i32 %C 119} 120 121define i32 @test13(i32 %A) { 122 %B = lshr i32 %A, 31 123 %C = sub i32 0, %B 124 ret i32 %C 125; CHECK-LABEL: @test13( 126; CHECK: %C = ashr i32 %A, 31 127; CHECK: ret i32 %C 128} 129 130define i32 @test14(i32 %A) { 131 %B = lshr i32 %A, 31 132 %C = bitcast i32 %B to i32 133 %D = sub i32 0, %C 134 ret i32 %D 135; CHECK-LABEL: @test14( 136; CHECK: %D = ashr i32 %A, 31 137; CHECK: ret i32 %D 138} 139 140define i32 @test15(i32 %A, i32 %B) { 141 %C = sub i32 0, %A 142 %D = srem i32 %B, %C 143 ret i32 %D 144; CHECK-LABEL: @test15( 145; CHECK: %[[sub:.*]] = sub i32 0, %A 146; CHECK-NEXT: %[[rem:.*]] = srem i32 %B, %[[sub]] 147; CHECK: ret i32 %[[rem]] 148} 149 150define i32 @test16(i32 %A) { 151 %X = sdiv i32 %A, 1123 152 %Y = sub i32 0, %X 153 ret i32 %Y 154; CHECK-LABEL: @test16( 155; CHECK: %Y = sdiv i32 %A, -1123 156; CHECK: ret i32 %Y 157} 158 159; Can't fold subtract here because negation it might oveflow. 160; PR3142 161define i32 @test17(i32 %A) { 162 %B = sub i32 0, %A 163 %C = sdiv i32 %B, 1234 164 ret i32 %C 165; CHECK-LABEL: @test17( 166; CHECK: %B = sub i32 0, %A 167; CHECK: %C = sdiv i32 %B, 1234 168; CHECK: ret i32 %C 169} 170 171define i64 @test18(i64 %Y) { 172 %tmp.4 = shl i64 %Y, 2 173 %tmp.12 = shl i64 %Y, 2 174 %tmp.8 = sub i64 %tmp.4, %tmp.12 175 ret i64 %tmp.8 176; CHECK-LABEL: @test18( 177; CHECK: ret i64 0 178} 179 180define i32 @test19(i32 %X, i32 %Y) { 181 %Z = sub i32 %X, %Y 182 %Q = add i32 %Z, %Y 183 ret i32 %Q 184; CHECK-LABEL: @test19( 185; CHECK: ret i32 %X 186} 187 188define i1 @test20(i32 %g, i32 %h) { 189 %tmp.2 = sub i32 %g, %h 190 %tmp.4 = icmp ne i32 %tmp.2, %g 191 ret i1 %tmp.4 192; CHECK-LABEL: @test20( 193; CHECK: %tmp.4 = icmp ne i32 %h, 0 194; CHECK: ret i1 %tmp.4 195} 196 197define i1 @test21(i32 %g, i32 %h) { 198 %tmp.2 = sub i32 %g, %h 199 %tmp.4 = icmp ne i32 %tmp.2, %g 200 ret i1 %tmp.4 201; CHECK-LABEL: @test21( 202; CHECK: %tmp.4 = icmp ne i32 %h, 0 203; CHECK: ret i1 %tmp.4 204} 205 206; PR2298 207define zeroext i1 @test22(i32 %a, i32 %b) nounwind { 208 %tmp2 = sub i32 0, %a 209 %tmp4 = sub i32 0, %b 210 %tmp5 = icmp eq i32 %tmp2, %tmp4 211 ret i1 %tmp5 212; CHECK-LABEL: @test22( 213; CHECK: %tmp5 = icmp eq i32 %b, %a 214; CHECK: ret i1 %tmp5 215} 216 217; rdar://7362831 218define i32 @test23(i8* %P, i64 %A){ 219 %B = getelementptr inbounds i8* %P, i64 %A 220 %C = ptrtoint i8* %B to i64 221 %D = trunc i64 %C to i32 222 %E = ptrtoint i8* %P to i64 223 %F = trunc i64 %E to i32 224 %G = sub i32 %D, %F 225 ret i32 %G 226; CHECK-LABEL: @test23( 227; CHECK-NEXT: = trunc i64 %A to i32 228; CHECK-NEXT: ret i32 229} 230 231define i8 @test23_as1(i8 addrspace(1)* %P, i16 %A) { 232; CHECK: @test23_as1 233; CHECK-NEXT: = trunc i16 %A to i8 234; CHECK-NEXT: ret i8 235 %B = getelementptr inbounds i8 addrspace(1)* %P, i16 %A 236 %C = ptrtoint i8 addrspace(1)* %B to i16 237 %D = trunc i16 %C to i8 238 %E = ptrtoint i8 addrspace(1)* %P to i16 239 %F = trunc i16 %E to i8 240 %G = sub i8 %D, %F 241 ret i8 %G 242} 243 244define i64 @test24(i8* %P, i64 %A){ 245 %B = getelementptr inbounds i8* %P, i64 %A 246 %C = ptrtoint i8* %B to i64 247 %E = ptrtoint i8* %P to i64 248 %G = sub i64 %C, %E 249 ret i64 %G 250; CHECK-LABEL: @test24( 251; CHECK-NEXT: ret i64 %A 252} 253 254define i16 @test24_as1(i8 addrspace(1)* %P, i16 %A) { 255; CHECK: @test24_as1 256; CHECK-NEXT: ret i16 %A 257 %B = getelementptr inbounds i8 addrspace(1)* %P, i16 %A 258 %C = ptrtoint i8 addrspace(1)* %B to i16 259 %E = ptrtoint i8 addrspace(1)* %P to i16 260 %G = sub i16 %C, %E 261 ret i16 %G 262} 263 264define i64 @test24a(i8* %P, i64 %A){ 265 %B = getelementptr inbounds i8* %P, i64 %A 266 %C = ptrtoint i8* %B to i64 267 %E = ptrtoint i8* %P to i64 268 %G = sub i64 %E, %C 269 ret i64 %G 270; CHECK-LABEL: @test24a( 271; CHECK-NEXT: sub i64 0, %A 272; CHECK-NEXT: ret i64 273} 274 275define i16 @test24a_as1(i8 addrspace(1)* %P, i16 %A) { 276; CHECK: @test24a_as1 277; CHECK-NEXT: sub i16 0, %A 278; CHECK-NEXT: ret i16 279 %B = getelementptr inbounds i8 addrspace(1)* %P, i16 %A 280 %C = ptrtoint i8 addrspace(1)* %B to i16 281 %E = ptrtoint i8 addrspace(1)* %P to i16 282 %G = sub i16 %E, %C 283 ret i16 %G 284} 285 286 287@Arr = external global [42 x i16] 288 289define i64 @test24b(i8* %P, i64 %A){ 290 %B = getelementptr inbounds [42 x i16]* @Arr, i64 0, i64 %A 291 %C = ptrtoint i16* %B to i64 292 %G = sub i64 %C, ptrtoint ([42 x i16]* @Arr to i64) 293 ret i64 %G 294; CHECK-LABEL: @test24b( 295; CHECK-NEXT: shl nuw i64 %A, 1 296; CHECK-NEXT: ret i64 297} 298 299 300define i64 @test25(i8* %P, i64 %A){ 301 %B = getelementptr inbounds [42 x i16]* @Arr, i64 0, i64 %A 302 %C = ptrtoint i16* %B to i64 303 %G = sub i64 %C, ptrtoint (i16* getelementptr ([42 x i16]* @Arr, i64 1, i64 0) to i64) 304 ret i64 %G 305; CHECK-LABEL: @test25( 306; CHECK-NEXT: shl nuw i64 %A, 1 307; CHECK-NEXT: add i64 {{.*}}, -84 308; CHECK-NEXT: ret i64 309} 310 311@Arr_as1 = external addrspace(1) global [42 x i16] 312 313define i16 @test25_as1(i8 addrspace(1)* %P, i64 %A) { 314; CHECK: @test25_as1 315; CHECK-NEXT: %1 = trunc i64 %A to i16 316; CHECK-NEXT: shl nuw i16 %1, 1 317; CHECK-NEXT: add i16 {{.*}}, -84 318; CHECK-NEXT: ret i16 319 %B = getelementptr inbounds [42 x i16] addrspace(1)* @Arr_as1, i64 0, i64 %A 320 %C = ptrtoint i16 addrspace(1)* %B to i16 321 %G = sub i16 %C, ptrtoint (i16 addrspace(1)* getelementptr ([42 x i16] addrspace(1)* @Arr_as1, i64 1, i64 0) to i16) 322 ret i16 %G 323} 324 325define i32 @test26(i32 %x) { 326 %shl = shl i32 3, %x 327 %neg = sub i32 0, %shl 328 ret i32 %neg 329; CHECK-LABEL: @test26( 330; CHECK-NEXT: shl i32 -3 331; CHECK-NEXT: ret i32 332} 333 334define i32 @test27(i32 %x, i32 %y) { 335 %mul = mul i32 %y, -8 336 %sub = sub i32 %x, %mul 337 ret i32 %sub 338; CHECK-LABEL: @test27( 339; CHECK-NEXT: shl i32 %y, 3 340; CHECK-NEXT: add i32 341; CHECK-NEXT: ret i32 342} 343 344define i32 @test28(i32 %x, i32 %y, i32 %z) { 345 %neg = sub i32 0, %z 346 %mul = mul i32 %neg, %y 347 %sub = sub i32 %x, %mul 348 ret i32 %sub 349; CHECK-LABEL: @test28( 350; CHECK-NEXT: mul i32 %z, %y 351; CHECK-NEXT: add i32 352; CHECK-NEXT: ret i32 353} 354 355define i64 @test29(i8* %foo, i64 %i, i64 %j) { 356 %gep1 = getelementptr inbounds i8* %foo, i64 %i 357 %gep2 = getelementptr inbounds i8* %foo, i64 %j 358 %cast1 = ptrtoint i8* %gep1 to i64 359 %cast2 = ptrtoint i8* %gep2 to i64 360 %sub = sub i64 %cast1, %cast2 361 ret i64 %sub 362; CHECK-LABEL: @test29( 363; CHECK-NEXT: sub i64 %i, %j 364; CHECK-NEXT: ret i64 365} 366 367define i64 @test30(i8* %foo, i64 %i, i64 %j) { 368 %bit = bitcast i8* %foo to i32* 369 %gep1 = getelementptr inbounds i32* %bit, i64 %i 370 %gep2 = getelementptr inbounds i8* %foo, i64 %j 371 %cast1 = ptrtoint i32* %gep1 to i64 372 %cast2 = ptrtoint i8* %gep2 to i64 373 %sub = sub i64 %cast1, %cast2 374 ret i64 %sub 375; CHECK-LABEL: @test30( 376; CHECK-NEXT: %gep1.idx = shl nuw i64 %i, 2 377; CHECK-NEXT: sub i64 %gep1.idx, %j 378; CHECK-NEXT: ret i64 379} 380 381define i16 @test30_as1(i8 addrspace(1)* %foo, i16 %i, i16 %j) { 382; CHECK-LABEL: @test30_as1( 383; CHECK-NEXT: %gep1.idx = shl nuw i16 %i, 2 384; CHECK-NEXT: sub i16 %gep1.idx, %j 385; CHECK-NEXT: ret i16 386 %bit = bitcast i8 addrspace(1)* %foo to i32 addrspace(1)* 387 %gep1 = getelementptr inbounds i32 addrspace(1)* %bit, i16 %i 388 %gep2 = getelementptr inbounds i8 addrspace(1)* %foo, i16 %j 389 %cast1 = ptrtoint i32 addrspace(1)* %gep1 to i16 390 %cast2 = ptrtoint i8 addrspace(1)* %gep2 to i16 391 %sub = sub i16 %cast1, %cast2 392 ret i16 %sub 393} 394 395define <2 x i64> @test31(<2 x i64> %A) { 396 %xor = xor <2 x i64> %A, <i64 -1, i64 -1> 397 %sub = sub <2 x i64> <i64 2, i64 3>, %xor 398 ret <2 x i64> %sub 399; CHECK-LABEL: @test31( 400; CHECK-NEXT: %sub = add <2 x i64> %A, <i64 3, i64 4> 401; CHECK-NEXT: ret <2 x i64> %sub 402} 403 404define <2 x i64> @test32(<2 x i64> %A) { 405 %add = add <2 x i64> %A, <i64 -1, i64 -1> 406 %sub = sub <2 x i64> <i64 2, i64 3>, %add 407 ret <2 x i64> %sub 408; CHECK-LABEL: @test32( 409; CHECK-NEXT: %sub = sub <2 x i64> <i64 3, i64 4> 410; CHECK-NEXT: ret <2 x i64> %sub 411} 412 413define <2 x i64> @test33(<2 x i1> %A) { 414 %ext = zext <2 x i1> %A to <2 x i64> 415 %sub = sub <2 x i64> zeroinitializer, %ext 416 ret <2 x i64> %sub 417; CHECK-LABEL: @test33( 418; CHECK-NEXT: %sub = sext <2 x i1> %A to <2 x i64> 419; CHECK-NEXT: ret <2 x i64> %sub 420} 421 422define <2 x i64> @test34(<2 x i1> %A) { 423 %ext = sext <2 x i1> %A to <2 x i64> 424 %sub = sub <2 x i64> zeroinitializer, %ext 425 ret <2 x i64> %sub 426; CHECK-LABEL: @test34( 427; CHECK-NEXT: %sub = zext <2 x i1> %A to <2 x i64> 428; CHECK-NEXT: ret <2 x i64> %sub 429} 430 431define <2 x i64> @test35(<2 x i64> %A) { 432 %mul = mul <2 x i64> %A, <i64 3, i64 4> 433 %sub = sub <2 x i64> %A, %mul 434 ret <2 x i64> %sub 435; CHECK-LABEL: @test35( 436; CHECK-NEXT: %sub = mul <2 x i64> %A, <i64 -2, i64 -3> 437; CHECK-NEXT: ret <2 x i64> %sub 438} 439 440define <2 x i64> @test36(<2 x i64> %A) { 441 %shl = shl <2 x i64> %A, <i64 3, i64 4> 442 %sub = sub <2 x i64> %shl, %A 443 ret <2 x i64> %sub 444; CHECK-LABEL: @test36( 445; CHECK-NEXT: %sub = mul <2 x i64> %A, <i64 7, i64 15> 446; CHECK-NEXT: ret <2 x i64> %sub 447} 448 449define <2 x i32> @test37(<2 x i32> %A) { 450 %div = sdiv <2 x i32> %A, <i32 -2147483648, i32 -2147483648> 451 %sub = sub nsw <2 x i32> zeroinitializer, %div 452 ret <2 x i32> %sub 453; CHECK-LABEL: @test37( 454; CHECK-NEXT: [[ICMP:%.*]] = icmp eq <2 x i32> %A, <i32 -2147483648, i32 -2147483648> 455; CHECK-NEXT: [[SEXT:%.*]] = sext <2 x i1> [[ICMP]] to <2 x i32> 456; CHECK-NEXT: ret <2 x i32> [[SEXT]] 457} 458 459define i32 @test38(i32 %A) { 460 %div = sdiv i32 %A, -2147483648 461 %sub = sub nsw i32 0, %div 462 ret i32 %sub 463; CHECK-LABEL: @test38( 464; CHECK-NEXT: [[ICMP:%.*]] = icmp eq i32 %A, -2147483648 465; CHECK-NEXT: [[SEXT:%.*]] = sext i1 [[ICMP]] to i32 466; CHECK-NEXT: ret i32 [[SEXT]] 467} 468 469define i32 @test39(i32 %A, i32 %x) { 470 %B = sub i32 0, %A 471 %C = sub nsw i32 %x, %B 472 ret i32 %C 473; CHECK-LABEL: @test39( 474; CHECK: %C = add i32 %x, %A 475; CHECK: ret i32 %C 476} 477 478define i16 @test40(i16 %a, i16 %b) { 479 %ashr = ashr i16 %a, 1 480 %ashr1 = ashr i16 %b, 1 481 %sub = sub i16 %ashr, %ashr1 482 ret i16 %sub 483; CHECK-LABEL: @test40( 484; CHECK-NEXT: [[ASHR:%.*]] = ashr i16 %a, 1 485; CHECK-NEXT: [[ASHR1:%.*]] = ashr i16 %b, 1 486; CHECK-NEXT: [[RET:%.*]] = sub nsw i16 [[ASHR]], [[ASHR1]] 487; CHECK: ret i16 [[RET]] 488} 489 490define i32 @test41(i16 %a, i16 %b) { 491 %conv = sext i16 %a to i32 492 %conv1 = sext i16 %b to i32 493 %sub = sub i32 %conv, %conv1 494 ret i32 %sub 495; CHECK-LABEL: @test41( 496; CHECK-NEXT: [[SEXT:%.*]] = sext i16 %a to i32 497; CHECK-NEXT: [[SEXT1:%.*]] = sext i16 %b to i32 498; CHECK-NEXT: [[RET:%.*]] = sub nsw i32 [[SEXT]], [[SEXT1]] 499; CHECK: ret i32 [[RET]] 500} 501 502define i4 @test42(i4 %x, i4 %y) { 503 %a = and i4 %y, 7 504 %b = and i4 %x, 7 505 %c = sub i4 %a, %b 506 ret i4 %c 507; CHECK-LABEL: @test42( 508; CHECK-NEXT: [[AND:%.*]] = and i4 %y, 7 509; CHECK-NEXT: [[AND1:%.*]] = and i4 %x, 7 510; CHECK-NEXT: [[RET:%.*]] = sub nsw i4 [[AND]], [[AND1]] 511; CHECK: ret i4 [[RET]] 512} 513 514define i4 @test43(i4 %x, i4 %y) { 515 %a = or i4 %x, -8 516 %b = and i4 %y, 7 517 %c = sub i4 %a, %b 518 ret i4 %c 519; CHECK-LABEL: @test43( 520; CHECK-NEXT: [[OR:%.*]] = or i4 %x, -8 521; CHECK-NEXT: [[AND:%.*]] = and i4 %y, 7 522; CHECK-NEXT: [[RET:%.*]] = sub nuw i4 [[OR]], [[AND]] 523; CHECK: ret i4 [[RET]] 524} 525 526define i32 @test44(i32 %x) { 527 %sub = sub nsw i32 %x, 32768 528 ret i32 %sub 529; CHECK-LABEL: @test44( 530; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 %x, -32768 531; CHECK: ret i32 [[ADD]] 532} 533 534define i32 @test45(i32 %x, i32 %y) { 535 %or = or i32 %x, %y 536 %xor = xor i32 %x, %y 537 %sub = sub i32 %or, %xor 538 ret i32 %sub 539; CHECK-LABEL: @test45( 540; CHECK-NEXT: %sub = and i32 %x, %y 541; CHECK: ret i32 %sub 542} 543 544define i32 @test46(i32 %x, i32 %y) { 545 %or = or i32 %x, %y 546 %sub = sub i32 %or, %x 547 ret i32 %sub 548; CHECK-LABEL: @test46( 549; CHECK-NEXT: %x.not = xor i32 %x, -1 550; CHECK-NEXT: %sub = and i32 %y, %x.not 551; CHECK: ret i32 %sub 552} 553