src/compiler/nir/nir_opcodes.py

   1 #
   2 # Copyright (C) 2014 Connor Abbott
   3 #
   4 # Permission is hereby granted, free of charge, to any person obtaining a
   5 # copy of this software and associated documentation files (the "Software"),
   6 # to deal in the Software without restriction, including without limitation
   7 # the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8 # and/or sell copies of the Software, and to permit persons to whom the
   9 # Software is furnished to do so, subject to the following conditions:
  10 #
  11 # The above copyright notice and this permission notice (including the next
  12 # paragraph) shall be included in all copies or substantial portions of the
  13 # Software.
  14 #
  15 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18 # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21 # IN THE SOFTWARE.
  22 #
  23 # Authors:
  24 #    Connor Abbott (cwabbott0@gmail.com)
  25
  26
  27 # Class that represents all the information we have about the opcode
  28 # NOTE: this must be kept in sync with nir_op_info
  29
  30 class Opcode(object):
  31    """Class that represents all the information we have about the opcode
  32    NOTE: this must be kept in sync with nir_op_info
  33    """
  34    def __init__(self, name, output_size, output_type, input_sizes,
  35                 input_types, algebraic_properties, const_expr):
  36       """Parameters:
  37
  38       - name is the name of the opcode (prepend nir_op_ for the enum name)
  39       - all types are strings that get nir_type_ prepended to them
  40       - input_types is a list of types
  41       - algebraic_properties is a space-seperated string, where nir_op_is_ is
  42         prepended before each entry
  43       - const_expr is an expression or series of statements that computes the
  44         constant value of the opcode given the constant values of its inputs.
  45
  46       Constant expressions are formed from the variables src0, src1, ...,
  47       src(N-1), where N is the number of arguments.  The output of the
  48       expression should be stored in the dst variable.  Per-component input
  49       and output variables will be scalars and non-per-component input and
  50       output variables will be a struct with fields named x, y, z, and w
  51       all of the correct type.  Input and output variables can be assumed
  52       to already be of the correct type and need no conversion.  In
  53       particular, the conversion from the C bool type to/from  NIR_TRUE and
  54       NIR_FALSE happens automatically.
  55
  56       For per-component instructions, the entire expression will be
  57       executed once for each component.  For non-per-component
  58       instructions, the expression is expected to store the correct values
  59       in dst.x, dst.y, etc.  If "dst" does not exist anywhere in the
  60       constant expression, an assignment to dst will happen automatically
  61       and the result will be equivalent to "dst = <expression>" for
  62       per-component instructions and "dst.x = dst.y = ... = <expression>"
  63       for non-per-component instructions.
  64       """
  65       assert isinstance(name, str)
  66       assert isinstance(output_size, int)
  67       assert isinstance(output_type, str)
  68       assert isinstance(input_sizes, list)
  69       assert isinstance(input_sizes[0], int)
  70       assert isinstance(input_types, list)
  71       assert isinstance(input_types[0], str)
  72       assert isinstance(algebraic_properties, str)
  73       assert isinstance(const_expr, str)
  74       assert len(input_sizes) == len(input_types)
  75       assert 0 <= output_size <= 4
  76       for size in input_sizes:
  77          assert 0 <= size <= 4
  78          if output_size != 0:
  79             assert size != 0
  80       self.name = name
  81       self.num_inputs = len(input_sizes)
  82       self.output_size = output_size
  83       self.output_type = output_type
  84       self.input_sizes = input_sizes
  85       self.input_types = input_types
  86       self.algebraic_properties = algebraic_properties
  87       self.const_expr = const_expr
  88
  89 # helper variables for strings
  90 tfloat = "float"
  91 tint = "int"
  92 tbool = "bool32"
  93 tuint = "uint"
  94 tfloat32 = "float32"
  95 tint32 = "int32"
  96 tuint32 = "uint32"
  97 tint64 = "int64"
  98 tuint64 = "uint64"
  99 tfloat64 = "float64"
 100
 101 commutative = "commutative "
 102 associative = "associative "
 103
 104 # global dictionary of opcodes
 105 opcodes = {}
 106
 107 def opcode(name, output_size, output_type, input_sizes, input_types,
 108            algebraic_properties, const_expr):
 109    assert name not in opcodes
 110    opcodes[name] = Opcode(name, output_size, output_type, input_sizes,
 111                           input_types, algebraic_properties, const_expr)
 112
 113 def unop_convert(name, out_type, in_type, const_expr):
 114    opcode(name, 0, out_type, [0], [in_type], "", const_expr)
 115
 116 def unop(name, ty, const_expr):
 117    opcode(name, 0, ty, [0], [ty], "", const_expr)
 118
 119 def unop_horiz(name, output_size, output_type, input_size, input_type,
 120                const_expr):
 121    opcode(name, output_size, output_type, [input_size], [input_type], "",
 122           const_expr)
 123
 124 def unop_reduce(name, output_size, output_type, input_type, prereduce_expr,
 125                 reduce_expr, final_expr):
 126    def prereduce(src):
 127       return "(" + prereduce_expr.format(src=src) + ")"
 128    def final(src):
 129       return final_expr.format(src="(" + src + ")")
 130    def reduce_(src0, src1):
 131       return reduce_expr.format(src0=src0, src1=src1)
 132    src0 = prereduce("src0.x")
 133    src1 = prereduce("src0.y")
 134    src2 = prereduce("src0.z")
 135    src3 = prereduce("src0.w")
 136    unop_horiz(name + "2", output_size, output_type, 2, input_type,
 137               final(reduce_(src0, src1)))
 138    unop_horiz(name + "3", output_size, output_type, 3, input_type,
 139               final(reduce_(reduce_(src0, src1), src2)))
 140    unop_horiz(name + "4", output_size, output_type, 4, input_type,
 141               final(reduce_(reduce_(src0, src1), reduce_(src2, src3))))
 142
 143
 144 # These two move instructions differ in what modifiers they support and what
 145 # the negate modifier means. Otherwise, they are identical.
 146 unop("fmov", tfloat, "src0")
 147 unop("imov", tint, "src0")
 148
 149 unop("ineg", tint, "-src0")
 150 unop("fneg", tfloat, "-src0")
 151 unop("inot", tint, "~src0") # invert every bit of the integer
 152 unop("fnot", tfloat, ("bit_size == 64 ? ((src0 == 0.0) ? 1.0 : 0.0f) : " +
 153                       "((src0 == 0.0f) ? 1.0f : 0.0f)"))
 154 unop("fsign", tfloat, ("bit_size == 64 ? " +
 155                        "((src0 == 0.0) ? 0.0 : ((src0 > 0.0) ? 1.0 : -1.0)) : " +
 156                        "((src0 == 0.0f) ? 0.0f : ((src0 > 0.0f) ? 1.0f : -1.0f))"))
 157 unop("isign", tint, "(src0 == 0) ? 0 : ((src0 > 0) ? 1 : -1)")
 158 unop("iabs", tint, "(src0 < 0) ? -src0 : src0")
 159 unop("fabs", tfloat, "fabs(src0)")
 160 unop("fsat", tfloat, ("bit_size == 64 ? " +
 161                       "((src0 > 1.0) ? 1.0 : ((src0 <= 0.0) ? 0.0 : src0)) : " +
 162                       "((src0 > 1.0f) ? 1.0f : ((src0 <= 0.0f) ? 0.0f : src0))"))
 163 unop("frcp", tfloat, "bit_size == 64 ? 1.0 / src0 : 1.0f / src0")
 164 unop("frsq", tfloat, "bit_size == 64 ? 1.0 / sqrt(src0) : 1.0f / sqrtf(src0)")
 165 unop("fsqrt", tfloat, "bit_size == 64 ? sqrt(src0) : sqrtf(src0)")
 166 unop("fexp2", tfloat, "exp2f(src0)")
 167 unop("flog2", tfloat, "log2f(src0)")
 168
 169 # Generate all of the numeric conversion opcodes
 170 for src_t in [tint, tuint, tfloat]:
 171    if src_t in (tint, tuint):
 172       dst_types = [tfloat, src_t]
 173    elif src_t == tfloat:
 174       dst_types = [tint, tuint, tfloat]
 175
 176    for dst_t in dst_types:
 177       if dst_t == tfloat:
 178          bit_sizes = [16, 32, 64]
 179       else:
 180          bit_sizes = [8, 16, 32, 64]
 181       for bit_size in bit_sizes:
 182           if bit_size == 16 and dst_t == tfloat and src_t == tfloat:
 183               rnd_modes = ['rtne', 'rtz', 'undef']
 184               for rnd_mode in rnd_modes:
 185                   unop_convert("{0}2{1}{2}_{3}".format(src_t[0], dst_t[0],
 186                                                        bit_size, rnd_mode),
 187                                dst_t + str(bit_size), src_t, "src0")
 188           else:
 189               unop_convert("{0}2{1}{2}".format(src_t[0], dst_t[0], bit_size),
 190                            dst_t + str(bit_size), src_t, "src0")
 191
 192 # We'll hand-code the to/from bool conversion opcodes.  Because bool doesn't
 193 # have multiple bit-sizes, we can always infer the size from the other type.
 194 unop_convert("f2b", tbool, tfloat, "src0 != 0.0")
 195 unop_convert("i2b", tbool, tint, "src0 != 0")
 196 unop_convert("b2f", tfloat, tbool, "src0 ? 1.0 : 0.0")
 197 unop_convert("b2i", tint, tbool, "src0 ? 1 : 0")
 198
 199
 200 # Unary floating-point rounding operations.
 201
 202
 203 unop("ftrunc", tfloat, "bit_size == 64 ? trunc(src0) : truncf(src0)")
 204 unop("fceil", tfloat, "bit_size == 64 ? ceil(src0) : ceilf(src0)")
 205 unop("ffloor", tfloat, "bit_size == 64 ? floor(src0) : floorf(src0)")
 206 unop("ffract", tfloat, "src0 - (bit_size == 64 ? floor(src0) : floorf(src0))")
 207 unop("fround_even", tfloat, "bit_size == 64 ? _mesa_roundeven(src0) : _mesa_roundevenf(src0)")
 208
 209 unop("fquantize2f16", tfloat, "(fabs(src0) < ldexpf(1.0, -14)) ? copysignf(0.0f, src0) : _mesa_half_to_float(_mesa_float_to_half(src0))")
 210
 211 # Trigonometric operations.
 212
 213
 214 unop("fsin", tfloat, "bit_size == 64 ? sin(src0) : sinf(src0)")
 215 unop("fcos", tfloat, "bit_size == 64 ? cos(src0) : cosf(src0)")
 216
 217
 218 # Partial derivatives.
 219
 220
 221 unop("fddx", tfloat, "0.0") # the derivative of a constant is 0.
 222 unop("fddy", tfloat, "0.0")
 223 unop("fddx_fine", tfloat, "0.0")
 224 unop("fddy_fine", tfloat, "0.0")
 225 unop("fddx_coarse", tfloat, "0.0")
 226 unop("fddy_coarse", tfloat, "0.0")
 227
 228
 229 # Floating point pack and unpack operations.
 230
 231 def pack_2x16(fmt):
 232    unop_horiz("pack_" + fmt + "_2x16", 1, tuint32, 2, tfloat32, """
 233 dst.x = (uint32_t) pack_fmt_1x16(src0.x);
 234 dst.x |= ((uint32_t) pack_fmt_1x16(src0.y)) << 16;
 235 """.replace("fmt", fmt))
 236
 237 def pack_4x8(fmt):
 238    unop_horiz("pack_" + fmt + "_4x8", 1, tuint32, 4, tfloat32, """
 239 dst.x = (uint32_t) pack_fmt_1x8(src0.x);
 240 dst.x |= ((uint32_t) pack_fmt_1x8(src0.y)) << 8;
 241 dst.x |= ((uint32_t) pack_fmt_1x8(src0.z)) << 16;
 242 dst.x |= ((uint32_t) pack_fmt_1x8(src0.w)) << 24;
 243 """.replace("fmt", fmt))
 244
 245 def unpack_2x16(fmt):
 246    unop_horiz("unpack_" + fmt + "_2x16", 2, tfloat32, 1, tuint32, """
 247 dst.x = unpack_fmt_1x16((uint16_t)(src0.x & 0xffff));
 248 dst.y = unpack_fmt_1x16((uint16_t)(src0.x << 16));
 249 """.replace("fmt", fmt))
 250
 251 def unpack_4x8(fmt):
 252    unop_horiz("unpack_" + fmt + "_4x8", 4, tfloat32, 1, tuint32, """
 253 dst.x = unpack_fmt_1x8((uint8_t)(src0.x & 0xff));
 254 dst.y = unpack_fmt_1x8((uint8_t)((src0.x >> 8) & 0xff));
 255 dst.z = unpack_fmt_1x8((uint8_t)((src0.x >> 16) & 0xff));
 256 dst.w = unpack_fmt_1x8((uint8_t)(src0.x >> 24));
 257 """.replace("fmt", fmt))
 258
 259
 260 pack_2x16("snorm")
 261 pack_4x8("snorm")
 262 pack_2x16("unorm")
 263 pack_4x8("unorm")
 264 pack_2x16("half")
 265 unpack_2x16("snorm")
 266 unpack_4x8("snorm")
 267 unpack_2x16("unorm")
 268 unpack_4x8("unorm")
 269 unpack_2x16("half")
 270
 271 unop_horiz("pack_uvec2_to_uint", 1, tuint32, 2, tuint32, """
 272 dst.x = (src0.x & 0xffff) | (src0.y << 16);
 273 """)
 274
 275 unop_horiz("pack_uvec4_to_uint", 1, tuint32, 4, tuint32, """
 276 dst.x = (src0.x <<  0) |
 277         (src0.y <<  8) |
 278         (src0.z << 16) |
 279         (src0.w << 24);
 280 """)
 281
 282 unop_horiz("pack_64_2x32", 1, tuint64, 2, tuint32,
 283            "dst.x = src0.x | ((uint64_t)src0.y << 32);")
 284
 285 unop_horiz("unpack_64_2x32", 2, tuint32, 1, tuint64,
 286            "dst.x = src0.x; dst.y = src0.x >> 32;")
 287
 288 # Lowered floating point unpacking operations.
 289
 290
 291 unop_horiz("unpack_half_2x16_split_x", 1, tfloat32, 1, tuint32,
 292            "unpack_half_1x16((uint16_t)(src0.x & 0xffff))")
 293 unop_horiz("unpack_half_2x16_split_y", 1, tfloat32, 1, tuint32,
 294            "unpack_half_1x16((uint16_t)(src0.x >> 16))")
 295
 296 unop_convert("unpack_64_2x32_split_x", tuint32, tuint64, "src0")
 297 unop_convert("unpack_64_2x32_split_y", tuint32, tuint64, "src0 >> 32")
 298
 299 # Bit operations, part of ARB_gpu_shader5.
 300
 301
 302 unop("bitfield_reverse", tuint32, """
 303 /* we're not winning any awards for speed here, but that's ok */
 304 dst = 0;
 305 for (unsigned bit = 0; bit < 32; bit++)
 306    dst |= ((src0 >> bit) & 1) << (31 - bit);
 307 """)
 308 unop("bit_count", tuint32, """
 309 dst = 0;
 310 for (unsigned bit = 0; bit < 32; bit++) {
 311    if ((src0 >> bit) & 1)
 312       dst++;
 313 }
 314 """)
 315
 316 unop_convert("ufind_msb", tint32, tuint32, """
 317 dst = -1;
 318 for (int bit = 31; bit >= 0; bit--) {
 319    if ((src0 >> bit) & 1) {
 320       dst = bit;
 321       break;
 322    }
 323 }
 324 """)
 325
 326 unop("ifind_msb", tint32, """
 327 dst = -1;
 328 for (int bit = 31; bit >= 0; bit--) {
 329    /* If src0 < 0, we're looking for the first 0 bit.
 330     * if src0 >= 0, we're looking for the first 1 bit.
 331     */
 332    if ((((src0 >> bit) & 1) && (src0 >= 0)) ||
 333       (!((src0 >> bit) & 1) && (src0 < 0))) {
 334       dst = bit;
 335       break;
 336    }
 337 }
 338 """)
 339
 340 unop("find_lsb", tint32, """
 341 dst = -1;
 342 for (unsigned bit = 0; bit < 32; bit++) {
 343    if ((src0 >> bit) & 1) {
 344       dst = bit;
 345       break;
 346    }
 347 }
 348 """)
 349
 350
 351 for i in xrange(1, 5):
 352    for j in xrange(1, 5):
 353       unop_horiz("fnoise{0}_{1}".format(i, j), i, tfloat, j, tfloat, "0.0f")
 354
 355 def binop_convert(name, out_type, in_type, alg_props, const_expr):
 356    opcode(name, 0, out_type, [0, 0], [in_type, in_type], alg_props, const_expr)
 357
 358 def binop(name, ty, alg_props, const_expr):
 359    binop_convert(name, ty, ty, alg_props, const_expr)
 360
 361 def binop_compare(name, ty, alg_props, const_expr):
 362    binop_convert(name, tbool, ty, alg_props, const_expr)
 363
 364 def binop_horiz(name, out_size, out_type, src1_size, src1_type, src2_size,
 365                 src2_type, const_expr):
 366    opcode(name, out_size, out_type, [src1_size, src2_size], [src1_type, src2_type],
 367           "", const_expr)
 368
 369 def binop_reduce(name, output_size, output_type, src_type, prereduce_expr,
 370                  reduce_expr, final_expr):
 371    def final(src):
 372       return final_expr.format(src= "(" + src + ")")
 373    def reduce_(src0, src1):
 374       return reduce_expr.format(src0=src0, src1=src1)
 375    def prereduce(src0, src1):
 376       return "(" + prereduce_expr.format(src0=src0, src1=src1) + ")"
 377    src0 = prereduce("src0.x", "src1.x")
 378    src1 = prereduce("src0.y", "src1.y")
 379    src2 = prereduce("src0.z", "src1.z")
 380    src3 = prereduce("src0.w", "src1.w")
 381    opcode(name + "2", output_size, output_type,
 382           [2, 2], [src_type, src_type], commutative,
 383           final(reduce_(src0, src1)))
 384    opcode(name + "3", output_size, output_type,
 385           [3, 3], [src_type, src_type], commutative,
 386           final(reduce_(reduce_(src0, src1), src2)))
 387    opcode(name + "4", output_size, output_type,
 388           [4, 4], [src_type, src_type], commutative,
 389           final(reduce_(reduce_(src0, src1), reduce_(src2, src3))))
 390
 391 binop("fadd", tfloat, commutative + associative, "src0 + src1")
 392 binop("iadd", tint, commutative + associative, "src0 + src1")
 393 binop("fsub", tfloat, "", "src0 - src1")
 394 binop("isub", tint, "", "src0 - src1")
 395
 396 binop("fmul", tfloat, commutative + associative, "src0 * src1")
 397 # low 32-bits of signed/unsigned integer multiply
 398 binop("imul", tint, commutative + associative, "src0 * src1")
 399 # high 32-bits of signed integer multiply
 400 binop("imul_high", tint32, commutative,
 401       "(int32_t)(((int64_t) src0 * (int64_t) src1) >> 32)")
 402 # high 32-bits of unsigned integer multiply
 403 binop("umul_high", tuint32, commutative,
 404       "(uint32_t)(((uint64_t) src0 * (uint64_t) src1) >> 32)")
 405
 406 binop("fdiv", tfloat, "", "src0 / src1")
 407 binop("idiv", tint, "", "src0 / src1")
 408 binop("udiv", tuint, "", "src0 / src1")
 409
 410 # returns a boolean representing the carry resulting from the addition of
 411 # the two unsigned arguments.
 412
 413 binop_convert("uadd_carry", tuint, tuint, commutative, "src0 + src1 < src0")
 414
 415 # returns a boolean representing the borrow resulting from the subtraction
 416 # of the two unsigned arguments.
 417
 418 binop_convert("usub_borrow", tuint, tuint, "", "src0 < src1")
 419
 420 binop("umod", tuint, "", "src1 == 0 ? 0 : src0 % src1")
 421
 422 # For signed integers, there are several different possible definitions of
 423 # "modulus" or "remainder".  We follow the conventions used by LLVM and
 424 # SPIR-V.  The irem opcode implements the standard C/C++ signed "%"
 425 # operation while the imod opcode implements the more mathematical
 426 # "modulus" operation.  For details on the difference, see
 427 #
 428 # http://mathforum.org/library/drmath/view/52343.html
 429
 430 binop("irem", tint, "", "src1 == 0 ? 0 : src0 % src1")
 431 binop("imod", tint, "",
 432       "src1 == 0 ? 0 : ((src0 % src1 == 0 || (src0 >= 0) == (src1 >= 0)) ?"
 433       "                 src0 % src1 : src0 % src1 + src1)")
 434 binop("fmod", tfloat, "", "src0 - src1 * floorf(src0 / src1)")
 435 binop("frem", tfloat, "", "src0 - src1 * truncf(src0 / src1)")
 436
 437 #
 438 # Comparisons
 439 #
 440
 441
 442 # these integer-aware comparisons return a boolean (0 or ~0)
 443
 444 binop_compare("flt", tfloat, "", "src0 < src1")
 445 binop_compare("fge", tfloat, "", "src0 >= src1")
 446 binop_compare("feq", tfloat, commutative, "src0 == src1")
 447 binop_compare("fne", tfloat, commutative, "src0 != src1")
 448 binop_compare("ilt", tint, "", "src0 < src1")
 449 binop_compare("ige", tint, "", "src0 >= src1")
 450 binop_compare("ieq", tint, commutative, "src0 == src1")
 451 binop_compare("ine", tint, commutative, "src0 != src1")
 452 binop_compare("ult", tuint, "", "src0 < src1")
 453 binop_compare("uge", tuint, "", "src0 >= src1")
 454
 455 # integer-aware GLSL-style comparisons that compare floats and ints
 456
 457 binop_reduce("ball_fequal",  1, tbool, tfloat, "{src0} == {src1}",
 458              "{src0} && {src1}", "{src}")
 459 binop_reduce("bany_fnequal", 1, tbool, tfloat, "{src0} != {src1}",
 460              "{src0} || {src1}", "{src}")
 461 binop_reduce("ball_iequal",  1, tbool, tint, "{src0} == {src1}",
 462              "{src0} && {src1}", "{src}")
 463 binop_reduce("bany_inequal", 1, tbool, tint, "{src0} != {src1}",
 464              "{src0} || {src1}", "{src}")
 465
 466 # non-integer-aware GLSL-style comparisons that return 0.0 or 1.0
 467
 468 binop_reduce("fall_equal",  1, tfloat32, tfloat32, "{src0} == {src1}",
 469              "{src0} && {src1}", "{src} ? 1.0f : 0.0f")
 470 binop_reduce("fany_nequal", 1, tfloat32, tfloat32, "{src0} != {src1}",
 471              "{src0} || {src1}", "{src} ? 1.0f : 0.0f")
 472
 473 # These comparisons for integer-less hardware return 1.0 and 0.0 for true
 474 # and false respectively
 475
 476 binop("slt", tfloat32, "", "(src0 < src1) ? 1.0f : 0.0f") # Set on Less Than
 477 binop("sge", tfloat, "", "(src0 >= src1) ? 1.0f : 0.0f") # Set on Greater or Equal
 478 binop("seq", tfloat32, commutative, "(src0 == src1) ? 1.0f : 0.0f") # Set on Equal
 479 binop("sne", tfloat32, commutative, "(src0 != src1) ? 1.0f : 0.0f") # Set on Not Equal
 480
 481
 482 opcode("ishl", 0, tint, [0, 0], [tint, tuint32], "", "src0 << src1")
 483 opcode("ishr", 0, tint, [0, 0], [tint, tuint32], "", "src0 >> src1")
 484 opcode("ushr", 0, tuint, [0, 0], [tuint, tuint32], "", "src0 >> src1")
 485
 486 # bitwise logic operators
 487 #
 488 # These are also used as boolean and, or, xor for hardware supporting
 489 # integers.
 490
 491
 492 binop("iand", tuint, commutative + associative, "src0 & src1")
 493 binop("ior", tuint, commutative + associative, "src0 | src1")
 494 binop("ixor", tuint, commutative + associative, "src0 ^ src1")
 495
 496
 497 # floating point logic operators
 498 #
 499 # These use (src != 0.0) for testing the truth of the input, and output 1.0
 500 # for true and 0.0 for false
 501
 502 binop("fand", tfloat32, commutative,
 503       "((src0 != 0.0f) && (src1 != 0.0f)) ? 1.0f : 0.0f")
 504 binop("for", tfloat32, commutative,
 505       "((src0 != 0.0f) || (src1 != 0.0f)) ? 1.0f : 0.0f")
 506 binop("fxor", tfloat32, commutative,
 507       "(src0 != 0.0f && src1 == 0.0f) || (src0 == 0.0f && src1 != 0.0f) ? 1.0f : 0.0f")
 508
 509 binop_reduce("fdot", 1, tfloat, tfloat, "{src0} * {src1}", "{src0} + {src1}",
 510              "{src}")
 511
 512 binop_reduce("fdot_replicated", 4, tfloat, tfloat,
 513              "{src0} * {src1}", "{src0} + {src1}", "{src}")
 514
 515 opcode("fdph", 1, tfloat, [3, 4], [tfloat, tfloat], "",
 516        "src0.x * src1.x + src0.y * src1.y + src0.z * src1.z + src1.w")
 517 opcode("fdph_replicated", 4, tfloat, [3, 4], [tfloat, tfloat], "",
 518        "src0.x * src1.x + src0.y * src1.y + src0.z * src1.z + src1.w")
 519
 520 binop("fmin", tfloat, "", "fminf(src0, src1)")
 521 binop("imin", tint, commutative + associative, "src1 > src0 ? src0 : src1")
 522 binop("umin", tuint, commutative + associative, "src1 > src0 ? src0 : src1")
 523 binop("fmax", tfloat, "", "fmaxf(src0, src1)")
 524 binop("imax", tint, commutative + associative, "src1 > src0 ? src1 : src0")
 525 binop("umax", tuint, commutative + associative, "src1 > src0 ? src1 : src0")
 526
 527 # Saturated vector add for 4 8bit ints.
 528 binop("usadd_4x8", tint32, commutative + associative, """
 529 dst = 0;
 530 for (int i = 0; i < 32; i += 8) {
 531    dst |= MIN2(((src0 >> i) & 0xff) + ((src1 >> i) & 0xff), 0xff) << i;
 532 }
 533 """)
 534
 535 # Saturated vector subtract for 4 8bit ints.
 536 binop("ussub_4x8", tint32, "", """
 537 dst = 0;
 538 for (int i = 0; i < 32; i += 8) {
 539    int src0_chan = (src0 >> i) & 0xff;
 540    int src1_chan = (src1 >> i) & 0xff;
 541    if (src0_chan > src1_chan)
 542       dst |= (src0_chan - src1_chan) << i;
 543 }
 544 """)
 545
 546 # vector min for 4 8bit ints.
 547 binop("umin_4x8", tint32, commutative + associative, """
 548 dst = 0;
 549 for (int i = 0; i < 32; i += 8) {
 550    dst |= MIN2((src0 >> i) & 0xff, (src1 >> i) & 0xff) << i;
 551 }
 552 """)
 553
 554 # vector max for 4 8bit ints.
 555 binop("umax_4x8", tint32, commutative + associative, """
 556 dst = 0;
 557 for (int i = 0; i < 32; i += 8) {
 558    dst |= MAX2((src0 >> i) & 0xff, (src1 >> i) & 0xff) << i;
 559 }
 560 """)
 561
 562 # unorm multiply: (a * b) / 255.
 563 binop("umul_unorm_4x8", tint32, commutative + associative, """
 564 dst = 0;
 565 for (int i = 0; i < 32; i += 8) {
 566    int src0_chan = (src0 >> i) & 0xff;
 567    int src1_chan = (src1 >> i) & 0xff;
 568    dst |= ((src0_chan * src1_chan) / 255) << i;
 569 }
 570 """)
 571
 572 binop("fpow", tfloat, "", "bit_size == 64 ? powf(src0, src1) : pow(src0, src1)")
 573
 574 binop_horiz("pack_half_2x16_split", 1, tuint32, 1, tfloat32, 1, tfloat32,
 575             "pack_half_1x16(src0.x) | (pack_half_1x16(src1.x) << 16)")
 576
 577 binop_convert("pack_64_2x32_split", tuint64, tuint32, "",
 578               "src0 | ((uint64_t)src1 << 32)")
 579
 580 # bfm implements the behavior of the first operation of the SM5 "bfi" assembly
 581 # and that of the "bfi1" i965 instruction. That is, it has undefined behavior
 582 # if either of its arguments are 32.
 583 binop_convert("bfm", tuint32, tint32, "", """
 584 int bits = src0, offset = src1;
 585 if (offset < 0 || bits < 0 || offset > 31 || bits > 31 || offset + bits > 32)
 586    dst = 0; /* undefined */
 587 else
 588    dst = ((1u << bits) - 1) << offset;
 589 """)
 590
 591 opcode("ldexp", 0, tfloat, [0, 0], [tfloat, tint32], "", """
 592 dst = (bit_size == 64) ? ldexp(src0, src1) : ldexpf(src0, src1);
 593 /* flush denormals to zero. */
 594 if (!isnormal(dst))
 595    dst = copysignf(0.0f, src0);
 596 """)
 597
 598 # Combines the first component of each input to make a 2-component vector.
 599
 600 binop_horiz("vec2", 2, tuint, 1, tuint, 1, tuint, """
 601 dst.x = src0.x;
 602 dst.y = src1.x;
 603 """)
 604
 605 # Byte extraction
 606 binop("extract_u8", tuint, "", "(uint8_t)(src0 >> (src1 * 8))")
 607 binop("extract_i8", tint, "", "(int8_t)(src0 >> (src1 * 8))")
 608
 609 # Word extraction
 610 binop("extract_u16", tuint, "", "(uint16_t)(src0 >> (src1 * 16))")
 611 binop("extract_i16", tint, "", "(int16_t)(src0 >> (src1 * 16))")
 612
 613
 614 def triop(name, ty, const_expr):
 615    opcode(name, 0, ty, [0, 0, 0], [ty, ty, ty], "", const_expr)
 616 def triop_horiz(name, output_size, src1_size, src2_size, src3_size, const_expr):
 617    opcode(name, output_size, tuint,
 618    [src1_size, src2_size, src3_size],
 619    [tuint, tuint, tuint], "", const_expr)
 620
 621 triop("ffma", tfloat, "src0 * src1 + src2")
 622
 623 triop("flrp", tfloat, "src0 * (1 - src2) + src1 * src2")
 624
 625 # Conditional Select
 626 #
 627 # A vector conditional select instruction (like ?:, but operating per-
 628 # component on vectors). There are two versions, one for floating point
 629 # bools (0.0 vs 1.0) and one for integer bools (0 vs ~0).
 630
 631
 632 triop("fcsel", tfloat32, "(src0 != 0.0f) ? src1 : src2")
 633 opcode("bcsel", 0, tuint, [0, 0, 0],
 634       [tbool, tuint, tuint], "", "src0 ? src1 : src2")
 635
 636 # SM5 bfi assembly
 637 triop("bfi", tuint32, """
 638 unsigned mask = src0, insert = src1, base = src2;
 639 if (mask == 0) {
 640    dst = base;
 641 } else {
 642    unsigned tmp = mask;
 643    while (!(tmp & 1)) {
 644       tmp >>= 1;
 645       insert <<= 1;
 646    }
 647    dst = (base & ~mask) | (insert & mask);
 648 }
 649 """)
 650
 651 # SM5 ubfe/ibfe assembly
 652 opcode("ubfe", 0, tuint32,
 653        [0, 0, 0], [tuint32, tint32, tint32], "", """
 654 unsigned base = src0;
 655 int offset = src1, bits = src2;
 656 if (bits == 0) {
 657    dst = 0;
 658 } else if (bits < 0 || offset < 0) {
 659    dst = 0; /* undefined */
 660 } else if (offset + bits < 32) {
 661    dst = (base << (32 - bits - offset)) >> (32 - bits);
 662 } else {
 663    dst = base >> offset;
 664 }
 665 """)
 666 opcode("ibfe", 0, tint32,
 667        [0, 0, 0], [tint32, tint32, tint32], "", """
 668 int base = src0;
 669 int offset = src1, bits = src2;
 670 if (bits == 0) {
 671    dst = 0;
 672 } else if (bits < 0 || offset < 0) {
 673    dst = 0; /* undefined */
 674 } else if (offset + bits < 32) {
 675    dst = (base << (32 - bits - offset)) >> (32 - bits);
 676 } else {
 677    dst = base >> offset;
 678 }
 679 """)
 680
 681 # GLSL bitfieldExtract()
 682 opcode("ubitfield_extract", 0, tuint32,
 683        [0, 0, 0], [tuint32, tint32, tint32], "", """
 684 unsigned base = src0;
 685 int offset = src1, bits = src2;
 686 if (bits == 0) {
 687    dst = 0;
 688 } else if (bits < 0 || offset < 0 || offset + bits > 32) {
 689    dst = 0; /* undefined per the spec */
 690 } else {
 691    dst = (base >> offset) & ((1ull << bits) - 1);
 692 }
 693 """)
 694 opcode("ibitfield_extract", 0, tint32,
 695        [0, 0, 0], [tint32, tint32, tint32], "", """
 696 int base = src0;
 697 int offset = src1, bits = src2;
 698 if (bits == 0) {
 699    dst = 0;
 700 } else if (offset < 0 || bits < 0 || offset + bits > 32) {
 701    dst = 0;
 702 } else {
 703    dst = (base << (32 - offset - bits)) >> offset; /* use sign-extending shift */
 704 }
 705 """)
 706
 707 # Combines the first component of each input to make a 3-component vector.
 708
 709 triop_horiz("vec3", 3, 1, 1, 1, """
 710 dst.x = src0.x;
 711 dst.y = src1.x;
 712 dst.z = src2.x;
 713 """)
 714
 715 def quadop_horiz(name, output_size, src1_size, src2_size, src3_size,
 716                  src4_size, const_expr):
 717    opcode(name, output_size, tuint,
 718           [src1_size, src2_size, src3_size, src4_size],
 719           [tuint, tuint, tuint, tuint],
 720           "", const_expr)
 721
 722 opcode("bitfield_insert", 0, tuint32, [0, 0, 0, 0],
 723        [tuint32, tuint32, tint32, tint32], "", """
 724 unsigned base = src0, insert = src1;
 725 int offset = src2, bits = src3;
 726 if (bits == 0) {
 727    dst = 0;
 728 } else if (offset < 0 || bits < 0 || bits + offset > 32) {
 729    dst = 0;
 730 } else {
 731    unsigned mask = ((1ull << bits) - 1) << offset;
 732    dst = (base & ~mask) | ((insert << bits) & mask);
 733 }
 734 """)
 735
 736 quadop_horiz("vec4", 4, 1, 1, 1, 1, """
 737 dst.x = src0.x;
 738 dst.y = src1.x;
 739 dst.z = src2.x;
 740 dst.w = src3.x;
 741 """)
 742
 743