test/codegen/shift.go

   1 // asmcheck
   2
   3 // Copyright 2018 The Go Authors. All rights reserved.
   4 // Use of this source code is governed by a BSD-style
   5 // license that can be found in the LICENSE file.
   6
   7 package codegen
   8
   9 // ------------------ //
  10 //   constant shifts  //
  11 // ------------------ //
  12
  13 func lshConst64x64(v int64) int64 {
  14         // ppc64x:"SLD"
  15         // riscv64:"SLLI",-"AND",-"SLTIU"
  16         return v << uint64(33)
  17 }
  18
  19 func rshConst64Ux64(v uint64) uint64 {
  20         // ppc64x:"SRD"
  21         // riscv64:"SRLI\t",-"AND",-"SLTIU"
  22         return v >> uint64(33)
  23 }
  24
  25 func rshConst64x64(v int64) int64 {
  26         // ppc64x:"SRAD"
  27         // riscv64:"SRAI",-"OR",-"SLTIU"
  28         return v >> uint64(33)
  29 }
  30
  31 func lshConst32x64(v int32) int32 {
  32         // ppc64x:"SLW"
  33         // riscv64:"SLLI",-"AND",-"SLTIU", -"MOVW"
  34         return v << uint64(29)
  35 }
  36
  37 func rshConst32Ux64(v uint32) uint32 {
  38         // ppc64x:"SRW"
  39         // riscv64:"SRLIW",-"AND",-"SLTIU", -"MOVW"
  40         return v >> uint64(29)
  41 }
  42
  43 func rshConst32x64(v int32) int32 {
  44         // ppc64x:"SRAW"
  45         // riscv64:"SRAI",-"OR",-"SLTIU", -"MOVW"
  46         return v >> uint64(29)
  47 }
  48
  49 func lshConst64x32(v int64) int64 {
  50         // ppc64x:"SLD"
  51         // riscv64:"SLLI",-"AND",-"SLTIU"
  52         return v << uint32(33)
  53 }
  54
  55 func rshConst64Ux32(v uint64) uint64 {
  56         // ppc64x:"SRD"
  57         // riscv64:"SRLI\t",-"AND",-"SLTIU"
  58         return v >> uint32(33)
  59 }
  60
  61 func rshConst64x32(v int64) int64 {
  62         // ppc64x:"SRAD"
  63         // riscv64:"SRAI",-"OR",-"SLTIU"
  64         return v >> uint32(33)
  65 }
  66
  67 // ------------------ //
  68 //   masked shifts    //
  69 // ------------------ //
  70
  71 func lshMask64x64(v int64, s uint64) int64 {
  72         // arm64:"LSL",-"AND"
  73         // ppc64x:"RLDICL",-"ORN",-"ISEL"
  74         // riscv64:"SLL",-"AND\t",-"SLTIU"
  75         // s390x:-"RISBGZ",-"AND",-"LOCGR"
  76         return v << (s & 63)
  77 }
  78
  79 func rshMask64Ux64(v uint64, s uint64) uint64 {
  80         // arm64:"LSR",-"AND",-"CSEL"
  81         // ppc64x:"RLDICL",-"ORN",-"ISEL"
  82         // riscv64:"SRL\t",-"AND\t",-"SLTIU"
  83         // s390x:-"RISBGZ",-"AND",-"LOCGR"
  84         return v >> (s & 63)
  85 }
  86
  87 func rshMask64x64(v int64, s uint64) int64 {
  88         // arm64:"ASR",-"AND",-"CSEL"
  89         // ppc64x:"RLDICL",-"ORN",-"ISEL"
  90         // riscv64:"SRA",-"OR",-"SLTIU"
  91         // s390x:-"RISBGZ",-"AND",-"LOCGR"
  92         return v >> (s & 63)
  93 }
  94
  95 func lshMask32x64(v int32, s uint64) int32 {
  96         // arm64:"LSL",-"AND"
  97         // ppc64x:"ISEL",-"ORN"
  98         // riscv64:"SLL",-"AND\t",-"SLTIU"
  99         // s390x:-"RISBGZ",-"AND",-"LOCGR"
 100         return v << (s & 63)
 101 }
 102
 103 func rshMask32Ux64(v uint32, s uint64) uint32 {
 104         // arm64:"LSR",-"AND"
 105         // ppc64x:"ISEL",-"ORN"
 106         // riscv64:"SRLW","SLTIU","NEG","AND\t",-"SRL\t"
 107         // s390x:-"RISBGZ",-"AND",-"LOCGR"
 108         return v >> (s & 63)
 109 }
 110
 111 func rsh5Mask32Ux64(v uint32, s uint64) uint32 {
 112         // riscv64:"SRLW",-"AND\t",-"SLTIU",-"SRL\t"
 113         return v >> (s & 31)
 114 }
 115
 116 func rshMask32x64(v int32, s uint64) int32 {
 117         // arm64:"ASR",-"AND"
 118         // ppc64x:"ISEL",-"ORN"
 119         // riscv64:"SRA",-"OR",-"SLTIU"
 120         // s390x:-"RISBGZ",-"AND",-"LOCGR"
 121         return v >> (s & 63)
 122 }
 123
 124 func lshMask64x32(v int64, s uint32) int64 {
 125         // arm64:"LSL",-"AND"
 126         // ppc64x:"RLDICL",-"ORN"
 127         // riscv64:"SLL",-"AND\t",-"SLTIU"
 128         // s390x:-"RISBGZ",-"AND",-"LOCGR"
 129         return v << (s & 63)
 130 }
 131
 132 func rshMask64Ux32(v uint64, s uint32) uint64 {
 133         // arm64:"LSR",-"AND",-"CSEL"
 134         // ppc64x:"RLDICL",-"ORN"
 135         // riscv64:"SRL\t",-"AND\t",-"SLTIU"
 136         // s390x:-"RISBGZ",-"AND",-"LOCGR"
 137         return v >> (s & 63)
 138 }
 139
 140 func rshMask64x32(v int64, s uint32) int64 {
 141         // arm64:"ASR",-"AND",-"CSEL"
 142         // ppc64x:"RLDICL",-"ORN",-"ISEL"
 143         // riscv64:"SRA",-"OR",-"SLTIU"
 144         // s390x:-"RISBGZ",-"AND",-"LOCGR"
 145         return v >> (s & 63)
 146 }
 147
 148 func lshMask64x32Ext(v int64, s int32) int64 {
 149         // ppc64x:"RLDICL",-"ORN",-"ISEL"
 150         // riscv64:"SLL",-"AND\t",-"SLTIU"
 151         // s390x:-"RISBGZ",-"AND",-"LOCGR"
 152         return v << uint(s&63)
 153 }
 154
 155 func rshMask64Ux32Ext(v uint64, s int32) uint64 {
 156         // ppc64x:"RLDICL",-"ORN",-"ISEL"
 157         // riscv64:"SRL\t",-"AND\t",-"SLTIU"
 158         // s390x:-"RISBGZ",-"AND",-"LOCGR"
 159         return v >> uint(s&63)
 160 }
 161
 162 func rshMask64x32Ext(v int64, s int32) int64 {
 163         // ppc64x:"RLDICL",-"ORN",-"ISEL"
 164         // riscv64:"SRA",-"OR",-"SLTIU"
 165         // s390x:-"RISBGZ",-"AND",-"LOCGR"
 166         return v >> uint(s&63)
 167 }
 168
 169 // --------------- //
 170 //  signed shifts  //
 171 // --------------- //
 172
 173 // We do want to generate a test + panicshift for these cases.
 174 func lshSigned(v8 int8, v16 int16, v32 int32, v64 int64, x int) {
 175         // amd64:"TESTB"
 176         _ = x << v8
 177         // amd64:"TESTW"
 178         _ = x << v16
 179         // amd64:"TESTL"
 180         _ = x << v32
 181         // amd64:"TESTQ"
 182         _ = x << v64
 183 }
 184
 185 // We want to avoid generating a test + panicshift for these cases.
 186 func lshSignedMasked(v8 int8, v16 int16, v32 int32, v64 int64, x int) {
 187         // amd64:-"TESTB"
 188         _ = x << (v8 & 7)
 189         // amd64:-"TESTW"
 190         _ = x << (v16 & 15)
 191         // amd64:-"TESTL"
 192         _ = x << (v32 & 31)
 193         // amd64:-"TESTQ"
 194         _ = x << (v64 & 63)
 195 }
 196
 197 // ------------------ //
 198 //   bounded shifts   //
 199 // ------------------ //
 200
 201 func lshGuarded64(v int64, s uint) int64 {
 202         if s < 64 {
 203                 // riscv64:"SLL",-"AND",-"SLTIU"
 204                 // s390x:-"RISBGZ",-"AND",-"LOCGR"
 205                 // wasm:-"Select",-".*LtU"
 206                 // arm64:"LSL",-"CSEL"
 207                 return v << s
 208         }
 209         panic("shift too large")
 210 }
 211
 212 func rshGuarded64U(v uint64, s uint) uint64 {
 213         if s < 64 {
 214                 // riscv64:"SRL\t",-"AND",-"SLTIU"
 215                 // s390x:-"RISBGZ",-"AND",-"LOCGR"
 216                 // wasm:-"Select",-".*LtU"
 217                 // arm64:"LSR",-"CSEL"
 218                 return v >> s
 219         }
 220         panic("shift too large")
 221 }
 222
 223 func rshGuarded64(v int64, s uint) int64 {
 224         if s < 64 {
 225                 // riscv64:"SRA",-"OR",-"SLTIU"
 226                 // s390x:-"RISBGZ",-"AND",-"LOCGR"
 227                 // wasm:-"Select",-".*LtU"
 228                 // arm64:"ASR",-"CSEL"
 229                 return v >> s
 230         }
 231         panic("shift too large")
 232 }
 233
 234 func provedUnsignedShiftLeft(val64 uint64, val32 uint32, val16 uint16, val8 uint8, shift int) (r1 uint64, r2 uint32, r3 uint16, r4 uint8) {
 235         if shift >= 0 && shift < 64 {
 236                 // arm64:"LSL",-"CSEL"
 237                 r1 = val64 << shift
 238         }
 239         if shift >= 0 && shift < 32 {
 240                 // arm64:"LSL",-"CSEL"
 241                 r2 = val32 << shift
 242         }
 243         if shift >= 0 && shift < 16 {
 244                 // arm64:"LSL",-"CSEL"
 245                 r3 = val16 << shift
 246         }
 247         if shift >= 0 && shift < 8 {
 248                 // arm64:"LSL",-"CSEL"
 249                 r4 = val8 << shift
 250         }
 251         return r1, r2, r3, r4
 252 }
 253
 254 func provedSignedShiftLeft(val64 int64, val32 int32, val16 int16, val8 int8, shift int) (r1 int64, r2 int32, r3 int16, r4 int8) {
 255         if shift >= 0 && shift < 64 {
 256                 // arm64:"LSL",-"CSEL"
 257                 r1 = val64 << shift
 258         }
 259         if shift >= 0 && shift < 32 {
 260                 // arm64:"LSL",-"CSEL"
 261                 r2 = val32 << shift
 262         }
 263         if shift >= 0 && shift < 16 {
 264                 // arm64:"LSL",-"CSEL"
 265                 r3 = val16 << shift
 266         }
 267         if shift >= 0 && shift < 8 {
 268                 // arm64:"LSL",-"CSEL"
 269                 r4 = val8 << shift
 270         }
 271         return r1, r2, r3, r4
 272 }
 273
 274 func provedUnsignedShiftRight(val64 uint64, val32 uint32, val16 uint16, val8 uint8, shift int) (r1 uint64, r2 uint32, r3 uint16, r4 uint8) {
 275         if shift >= 0 && shift < 64 {
 276                 // arm64:"LSR",-"CSEL"
 277                 r1 = val64 >> shift
 278         }
 279         if shift >= 0 && shift < 32 {
 280                 // arm64:"LSR",-"CSEL"
 281                 r2 = val32 >> shift
 282         }
 283         if shift >= 0 && shift < 16 {
 284                 // arm64:"LSR",-"CSEL"
 285                 r3 = val16 >> shift
 286         }
 287         if shift >= 0 && shift < 8 {
 288                 // arm64:"LSR",-"CSEL"
 289                 r4 = val8 >> shift
 290         }
 291         return r1, r2, r3, r4
 292 }
 293
 294 func provedSignedShiftRight(val64 int64, val32 int32, val16 int16, val8 int8, shift int) (r1 int64, r2 int32, r3 int16, r4 int8) {
 295         if shift >= 0 && shift < 64 {
 296                 // arm64:"ASR",-"CSEL"
 297                 r1 = val64 >> shift
 298         }
 299         if shift >= 0 && shift < 32 {
 300                 // arm64:"ASR",-"CSEL"
 301                 r2 = val32 >> shift
 302         }
 303         if shift >= 0 && shift < 16 {
 304                 // arm64:"ASR",-"CSEL"
 305                 r3 = val16 >> shift
 306         }
 307         if shift >= 0 && shift < 8 {
 308                 // arm64:"ASR",-"CSEL"
 309                 r4 = val8 >> shift
 310         }
 311         return r1, r2, r3, r4
 312 }
 313
 314 func checkUnneededTrunc(tab *[100000]uint32, d uint64, v uint32, h uint16, b byte) (uint32, uint64) {
 315
 316         // ppc64x:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
 317         f := tab[byte(v)^b]
 318         // ppc64x:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
 319         f += tab[byte(v)&b]
 320         // ppc64x:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
 321         f += tab[byte(v)|b]
 322         // ppc64x:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
 323         f += tab[uint16(v)&h]
 324         // ppc64x:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
 325         f += tab[uint16(v)^h]
 326         // ppc64x:-".*RLWINM",-".*RLDICR",".*CLRLSLDI"
 327         f += tab[uint16(v)|h]
 328         // ppc64x:-".*AND",-"RLDICR",".*CLRLSLDI"
 329         f += tab[v&0xff]
 330         // ppc64x:-".*AND",".*CLRLSLWI"
 331         f += 2 * uint32(uint16(d))
 332         // ppc64x:-".*AND",-"RLDICR",".*CLRLSLDI"
 333         g := 2 * uint64(uint32(d))
 334         return f, g
 335 }
 336
 337 func checkCombinedShifts(v8 uint8, v16 uint16, v32 uint32, x32 int32, v64 uint64) (uint8, uint16, uint32, uint64, int64) {
 338
 339         // ppc64x:-"AND","CLRLSLWI"
 340         f := (v8 & 0xF) << 2
 341         // ppc64x:"CLRLSLWI"
 342         f += byte(v16) << 3
 343         // ppc64x:-"AND","CLRLSLWI"
 344         g := (v16 & 0xFF) << 3
 345         // ppc64x:-"AND","CLRLSLWI"
 346         h := (v32 & 0xFFFFF) << 2
 347         // ppc64x:"CLRLSLDI"
 348         i := (v64 & 0xFFFFFFFF) << 5
 349         // ppc64x:-"CLRLSLDI"
 350         i += (v64 & 0xFFFFFFF) << 38
 351         // ppc64x/power9:-"CLRLSLDI"
 352         i += (v64 & 0xFFFF00) << 10
 353         // ppc64x/power9:-"SLD","EXTSWSLI"
 354         j := int64(x32+32) * 8
 355         return f, g, h, i, j
 356 }
 357
 358 func checkWidenAfterShift(v int64, u uint64) (int64, uint64) {
 359
 360         // ppc64x:-".*MOVW"
 361         f := int32(v >> 32)
 362         // ppc64x:".*MOVW"
 363         f += int32(v >> 31)
 364         // ppc64x:-".*MOVH"
 365         g := int16(v >> 48)
 366         // ppc64x:".*MOVH"
 367         g += int16(v >> 30)
 368         // ppc64x:-".*MOVH"
 369         g += int16(f >> 16)
 370         // ppc64x:-".*MOVB"
 371         h := int8(v >> 56)
 372         // ppc64x:".*MOVB"
 373         h += int8(v >> 28)
 374         // ppc64x:-".*MOVB"
 375         h += int8(f >> 24)
 376         // ppc64x:".*MOVB"
 377         h += int8(f >> 16)
 378         return int64(h), uint64(g)
 379 }
 380
 381 func checkShiftAndMask32(v []uint32) {
 382         i := 0
 383
 384         // ppc64x: "RLWNM\t[$]24, R[0-9]+, [$]12, [$]19, R[0-9]+"
 385         v[i] = (v[i] & 0xFF00000) >> 8
 386         i++
 387         // ppc64x: "RLWNM\t[$]26, R[0-9]+, [$]22, [$]29, R[0-9]+"
 388         v[i] = (v[i] & 0xFF00) >> 6
 389         i++
 390         // ppc64x: "MOVW\tR0"
 391         v[i] = (v[i] & 0xFF) >> 8
 392         i++
 393         // ppc64x: "MOVW\tR0"
 394         v[i] = (v[i] & 0xF000000) >> 28
 395         i++
 396         // ppc64x: "RLWNM\t[$]26, R[0-9]+, [$]24, [$]31, R[0-9]+"
 397         v[i] = (v[i] >> 6) & 0xFF
 398         i++
 399         // ppc64x: "RLWNM\t[$]26, R[0-9]+, [$]12, [$]19, R[0-9]+"
 400         v[i] = (v[i] >> 6) & 0xFF000
 401         i++
 402         // ppc64x: "MOVW\tR0"
 403         v[i] = (v[i] >> 20) & 0xFF000
 404         i++
 405         // ppc64x: "MOVW\tR0"
 406         v[i] = (v[i] >> 24) & 0xFF00
 407         i++
 408 }
 409
 410 func checkMergedShifts32(a [256]uint32, b [256]uint64, u uint32, v uint32) {
 411         // ppc64x: -"CLRLSLDI", "RLWNM\t[$]10, R[0-9]+, [$]22, [$]29, R[0-9]+"
 412         a[0] = a[uint8(v>>24)]
 413         // ppc64x: -"CLRLSLDI", "RLWNM\t[$]11, R[0-9]+, [$]21, [$]28, R[0-9]+"
 414         b[0] = b[uint8(v>>24)]
 415         // ppc64x: -"CLRLSLDI", "RLWNM\t[$]15, R[0-9]+, [$]21, [$]28, R[0-9]+"
 416         b[1] = b[(v>>20)&0xFF]
 417         // ppc64x: -"SLD", "RLWNM\t[$]10, R[0-9]+, [$]22, [$]28, R[0-9]+"
 418         b[2] = b[v>>25]
 419 }
 420
 421 // 128 bit shifts
 422
 423 func check128bitShifts(x, y uint64, bits uint) (uint64, uint64) {
 424         s := bits & 63
 425         ŝ := (64 - bits) & 63
 426         // check that the shift operation has two commas (three operands)
 427         // amd64:"SHRQ.*,.*,"
 428         shr := x>>s | y<<ŝ
 429         // amd64:"SHLQ.*,.*,"
 430         shl := x<<s | y>>ŝ
 431         return shr, shl
 432 }
 433
 434 func checkShiftToMask(u []uint64, s []int64) {
 435         // amd64:-"SHR",-"SHL","ANDQ"
 436         u[0] = u[0] >> 5 << 5
 437         // amd64:-"SAR",-"SHL","ANDQ"
 438         s[0] = s[0] >> 5 << 5
 439         // amd64:-"SHR",-"SHL","ANDQ"
 440         u[1] = u[1] << 5 >> 5
 441 }