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