src/gallium/drivers/vc4/vc4_qir.c

   1 /*
   2  * Copyright © 2014 Broadcom
   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
  24 #include "util/u_memory.h"
  25 #include "util/u_simple_list.h"
  26
  27 #include "vc4_qir.h"
  28 #include "vc4_qpu.h"
  29
  30 struct qir_op_info {
  31         const char *name;
  32         uint8_t ndst, nsrc;
  33         bool has_side_effects;
  34 };
  35
  36 static const struct qir_op_info qir_op_info[] = {
  37         [QOP_MOV] = { "mov", 1, 1 },
  38         [QOP_FADD] = { "fadd", 1, 2 },
  39         [QOP_FSUB] = { "fsub", 1, 2 },
  40         [QOP_FMUL] = { "fmul", 1, 2 },
  41         [QOP_FMIN] = { "fmin", 1, 2 },
  42         [QOP_FMAX] = { "fmax", 1, 2 },
  43         [QOP_FMINABS] = { "fminabs", 1, 2 },
  44         [QOP_FMAXABS] = { "fmaxabs", 1, 2 },
  45
  46         [QOP_SEQ] = { "seq", 1, 2 },
  47         [QOP_SNE] = { "sne", 1, 2 },
  48         [QOP_SGE] = { "sge", 1, 2 },
  49         [QOP_SLT] = { "slt", 1, 2 },
  50         [QOP_CMP] = { "cmp", 1, 3 },
  51
  52         [QOP_FTOI] = { "ftoi", 1, 1 },
  53         [QOP_ITOF] = { "itof", 1, 1 },
  54         [QOP_RCP] = { "rcp", 1, 1 },
  55         [QOP_RSQ] = { "rsq", 1, 1 },
  56         [QOP_EXP2] = { "exp2", 1, 2 },
  57         [QOP_LOG2] = { "log2", 1, 2 },
  58         [QOP_PACK_COLORS] = { "pack_colors", 1, 4 },
  59         [QOP_PACK_SCALED] = { "pack_scaled", 1, 2 },
  60         [QOP_VPM_WRITE] = { "vpm_write", 0, 1, true },
  61         [QOP_VPM_READ] = { "vpm_read", 0, 1, true },
  62         [QOP_TLB_PASSTHROUGH_Z_WRITE] = { "tlb_passthrough_z", 0, 0, true },
  63         [QOP_TLB_COLOR_WRITE] = { "tlb_color", 0, 1, true },
  64         [QOP_TLB_COLOR_READ] = { "tlb_color_read", 0, 0, true },
  65         [QOP_VARY_ADD_C] = { "vary_add_c", 1, 1 },
  66
  67         [QOP_FRAG_X] = { "frag_x", 1, 0 },
  68         [QOP_FRAG_Y] = { "frag_y", 1, 0 },
  69         [QOP_FRAG_Z] = { "frag_z", 1, 0 },
  70         [QOP_FRAG_RCP_W] = { "frag_rcp_w", 1, 0 },
  71
  72         [QOP_TEX_S] = { "tex_s", 0, 2 },
  73         [QOP_TEX_T] = { "tex_t", 0, 2 },
  74         [QOP_TEX_R] = { "tex_r", 0, 2 },
  75         [QOP_TEX_B] = { "tex_b", 0, 2 },
  76         [QOP_TEX_RESULT] = { "tex_result", 0, 0 },
  77         [QOP_R4_UNPACK_A] = { "r4_unpack_a", 1, 0 },
  78         [QOP_R4_UNPACK_B] = { "r4_unpack_b", 1, 0 },
  79         [QOP_R4_UNPACK_C] = { "r4_unpack_c", 1, 0 },
  80         [QOP_R4_UNPACK_D] = { "r4_unpack_d", 1, 0 },
  81 };
  82
  83 static const char *
  84 qir_get_op_name(enum qop qop)
  85 {
  86         if (qop < ARRAY_SIZE(qir_op_info) && qir_op_info[qop].name)
  87                 return qir_op_info[qop].name;
  88         else
  89                 return "???";
  90 }
  91
  92 int
  93 qir_get_op_nsrc(enum qop qop)
  94 {
  95         if (qop < ARRAY_SIZE(qir_op_info) && qir_op_info[qop].name)
  96                 return qir_op_info[qop].nsrc;
  97         else
  98                 abort();
  99 }
 100
 101 bool
 102 qir_has_side_effects(struct qinst *inst)
 103 {
 104         for (int i = 0; i < qir_get_op_nsrc(inst->op); i++) {
 105                 if (inst->src[i].file == QFILE_VARY ||
 106                     inst->src[i].file == QFILE_UNIF)
 107                         return true;
 108         }
 109
 110         return qir_op_info[inst->op].has_side_effects;
 111 }
 112
 113 static void
 114 qir_print_reg(struct qreg reg)
 115 {
 116         const char *files[] = {
 117                 [QFILE_TEMP] = "t",
 118                 [QFILE_VARY] = "v",
 119                 [QFILE_UNIF] = "u",
 120         };
 121
 122         if (reg.file == QFILE_NULL)
 123                 fprintf(stderr, "null");
 124         else
 125                 fprintf(stderr, "%s%d", files[reg.file], reg.index);
 126 }
 127
 128 void
 129 qir_dump_inst(struct qinst *inst)
 130 {
 131         fprintf(stderr, "%s ", qir_get_op_name(inst->op));
 132
 133         qir_print_reg(inst->dst);
 134         for (int i = 0; i < qir_get_op_nsrc(inst->op); i++) {
 135                 fprintf(stderr, ", ");
 136                 qir_print_reg(inst->src[i]);
 137         }
 138 }
 139
 140 void
 141 qir_dump(struct qcompile *c)
 142 {
 143         struct simple_node *node;
 144
 145         foreach(node, &c->instructions) {
 146                 struct qinst *inst = (struct qinst *)node;
 147                 qir_dump_inst(inst);
 148                 fprintf(stderr, "\n");
 149         }
 150 }
 151
 152 struct qreg
 153 qir_get_temp(struct qcompile *c)
 154 {
 155         struct qreg reg;
 156
 157         reg.file = QFILE_TEMP;
 158         reg.index = c->num_temps++;
 159
 160         return reg;
 161 }
 162
 163 struct qinst *
 164 qir_inst(enum qop op, struct qreg dst, struct qreg src0, struct qreg src1)
 165 {
 166         struct qinst *inst = CALLOC_STRUCT(qinst);
 167
 168         inst->op = op;
 169         inst->dst = dst;
 170         inst->src = calloc(2, sizeof(inst->src[0]));
 171         inst->src[0] = src0;
 172         inst->src[1] = src1;
 173
 174         return inst;
 175 }
 176
 177 struct qinst *
 178 qir_inst4(enum qop op, struct qreg dst,
 179           struct qreg a,
 180           struct qreg b,
 181           struct qreg c,
 182           struct qreg d)
 183 {
 184         struct qinst *inst = CALLOC_STRUCT(qinst);
 185
 186         inst->op = op;
 187         inst->dst = dst;
 188         inst->src = calloc(4, sizeof(*inst->src));
 189         inst->src[0] = a;
 190         inst->src[1] = b;
 191         inst->src[2] = c;
 192         inst->src[3] = d;
 193
 194         return inst;
 195 }
 196
 197 void
 198 qir_emit(struct qcompile *c, struct qinst *inst)
 199 {
 200         insert_at_tail(&c->instructions, &inst->link);
 201 }
 202
 203 bool
 204 qir_reg_equals(struct qreg a, struct qreg b)
 205 {
 206         return a.file == b.file && a.index == b.index;
 207 }
 208
 209 struct qcompile *
 210 qir_compile_init(void)
 211 {
 212         struct qcompile *c = CALLOC_STRUCT(qcompile);
 213
 214         make_empty_list(&c->instructions);
 215
 216         return c;
 217 }
 218
 219 void
 220 qir_compile_destroy(struct qcompile *c)
 221 {
 222         free(c);
 223 }
 224
 225 const char *
 226 qir_get_stage_name(enum qstage stage)
 227 {
 228         static const char *names[] = {
 229                 [QSTAGE_FRAG] = "FS",
 230                 [QSTAGE_VERT] = "VS",
 231                 [QSTAGE_COORD] = "CS",
 232         };
 233
 234         return names[stage];
 235 }
 236
 237 #define OPTPASS(func)                                                   \
 238         do {                                                            \
 239                 bool stage_progress = func(c);                          \
 240                 if (stage_progress) {                                   \
 241                         progress = true;                                \
 242                         if (print_opt_debug) {                          \
 243                                 fprintf(stderr,                         \
 244                                         "QIR opt pass %2d: %s progress\n", \
 245                                         pass, #func);                   \
 246                         }                                               \
 247                 }                                                       \
 248         } while (0)
 249
 250 void
 251 qir_optimize(struct qcompile *c)
 252 {
 253         bool print_opt_debug = false;
 254         int pass = 1;
 255
 256         while (true) {
 257                 bool progress = false;
 258
 259                 OPTPASS(qir_opt_algebraic);
 260                 OPTPASS(qir_opt_copy_propagation);
 261                 OPTPASS(qir_opt_dead_code);
 262
 263                 if (!progress)
 264                         break;
 265
 266                 pass++;
 267         }
 268 }