src/gallium/drivers/r600/sb/sb_peephole.cpp

   1 /*
   2  * Copyright 2013 Vadim Girlin <vadimgirlin@gmail.com>
   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  * on the rights to use, copy, modify, merge, publish, distribute, sub
   8  * license, and/or sell copies of the Software, and to permit persons to whom
   9  * the 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 NON-INFRINGEMENT. IN NO EVENT SHALL
  18  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  21  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *      Vadim Girlin
  25  */
  26
  27 #define PPH_DEBUG 0
  28
  29 #if PPH_DEBUG
  30 #define PPH_DUMP(q) do { q } while (0)
  31 #else
  32 #define PPH_DUMP(q)
  33 #endif
  34
  35 #include "sb_shader.h"
  36 #include "sb_pass.h"
  37
  38 namespace r600_sb {
  39
  40 int peephole::run() {
  41
  42         run_on(sh.root);
  43
  44         return 0;
  45 }
  46
  47 void peephole::run_on(container_node* c) {
  48
  49         for (node_iterator I = c->begin(), E = c->end(); I != E; ++I) {
  50                 node *n = *I;
  51
  52                 if (n->is_container())
  53                         run_on(static_cast<container_node*>(n));
  54                 else {
  55                         if (n->is_fetch_inst() && (n->fetch_op_flags() & FF_GDS)) {
  56                                 fetch_node *f = static_cast<fetch_node*>(n);
  57                                 bool has_dst = false;
  58
  59                                 for(vvec::iterator I = f->dst.begin(), E = f->dst.end(); I != E; ++I) {
  60                                         value *v = *I;
  61                                         if (v)
  62                                                 has_dst = true;
  63                                 }
  64                                 if (!has_dst)
  65                                         if (f->bc.op >= FETCH_OP_GDS_ADD_RET && f->bc.op <= FETCH_OP_GDS_USHORT_READ_RET)
  66                                                 f->bc.set_op(f->bc.op - FETCH_OP_GDS_ADD_RET + FETCH_OP_GDS_ADD);
  67                         }
  68                         if (n->is_alu_inst()) {
  69                                 alu_node *a = static_cast<alu_node*>(n);
  70
  71                                 if (a->bc.op_ptr->flags &
  72                                                 (AF_PRED | AF_SET | AF_CMOV | AF_KILL)) {
  73                                         optimize_cc_op(a);
  74                                 } else if (a->bc.op == ALU_OP1_FLT_TO_INT) {
  75
  76                                         alu_node *s = a;
  77                                         if (get_bool_flt_to_int_source(s)) {
  78                                                 convert_float_setcc(a, s);
  79                                         }
  80                                 }
  81                         }
  82                 }
  83         }
  84 }
  85
  86 void peephole::optimize_cc_op(alu_node* a) {
  87         unsigned aflags = a->bc.op_ptr->flags;
  88
  89         if (aflags & (AF_PRED | AF_SET | AF_KILL)) {
  90                 optimize_cc_op2(a);
  91         } else if (aflags & AF_CMOV) {
  92                 optimize_CNDcc_op(a);
  93         }
  94 }
  95
  96 void peephole::convert_float_setcc(alu_node *f2i, alu_node *s) {
  97         alu_node *ns = sh.clone(s);
  98
  99         ns->dst[0] = f2i->dst[0];
 100         ns->dst[0]->def = ns;
 101         ns->bc.set_op(ns->bc.op + (ALU_OP2_SETE_DX10 - ALU_OP2_SETE));
 102         f2i->insert_after(ns);
 103         f2i->remove();
 104 }
 105
 106 void peephole::optimize_cc_op2(alu_node* a) {
 107
 108         unsigned flags = a->bc.op_ptr->flags;
 109         unsigned cc = flags & AF_CC_MASK;
 110
 111         if ((cc != AF_CC_E && cc != AF_CC_NE) || a->pred)
 112                 return;
 113
 114         unsigned cmp_type = flags & AF_CMP_TYPE_MASK;
 115         unsigned dst_type = flags & AF_DST_TYPE_MASK;
 116
 117         int op_kind = (flags & AF_PRED) ? 1 :
 118                         (flags & AF_SET) ? 2 :
 119                         (flags & AF_KILL) ? 3 : 0;
 120
 121         bool swapped = false;
 122
 123         if (a->src[0]->is_const() && a->src[0]->literal_value == literal(0)) {
 124                 std::swap(a->src[0],a->src[1]);
 125                 swapped = true;
 126                 // clear modifiers
 127                 memset(&a->bc.src[0], 0, sizeof(bc_alu_src));
 128                 memset(&a->bc.src[1], 0, sizeof(bc_alu_src));
 129         }
 130
 131         if (swapped || (a->src[1]->is_const() &&
 132                         a->src[1]->literal_value == literal(0))) {
 133
 134                 value *s = a->src[0];
 135
 136                 bool_op_info bop = {};
 137
 138                 PPH_DUMP(
 139                         sblog << "cc_op2: ";
 140                         dump::dump_op(a);
 141                         sblog << "\n";
 142                 );
 143
 144                 if (!get_bool_op_info(s, bop))
 145                         return;
 146
 147                 if (cc == AF_CC_E)
 148                         bop.invert = !bop.invert;
 149
 150                 bool swap_args = false;
 151
 152                 cc = bop.n->bc.op_ptr->flags & AF_CC_MASK;
 153
 154                 if (bop.invert)
 155                         cc = invert_setcc_condition(cc, swap_args);
 156
 157                 if (bop.int_cvt) {
 158                         assert(cmp_type != AF_FLOAT_CMP);
 159                         cmp_type = AF_FLOAT_CMP;
 160                 }
 161
 162                 PPH_DUMP(
 163                         sblog << "boi node: ";
 164                         dump::dump_op(bop.n);
 165                         sblog << " invert: " << bop.invert << "  int_cvt: " << bop.int_cvt;
 166                         sblog <<"\n";
 167                 );
 168
 169                 unsigned newop;
 170
 171                 switch(op_kind) {
 172                 case 1:
 173                         newop = get_predsetcc_op(cc, cmp_type);
 174                         break;
 175                 case 2:
 176                         newop = get_setcc_op(cc, cmp_type, dst_type != AF_FLOAT_DST);
 177                         break;
 178                 case 3:
 179                         newop = get_killcc_op(cc, cmp_type);
 180                         break;
 181                 default:
 182                         newop = ALU_OP0_NOP;
 183                         assert(!"invalid op kind");
 184                         break;
 185                 }
 186
 187                 a->bc.set_op(newop);
 188
 189                 if (swap_args) {
 190                         a->src[0] = bop.n->src[1];
 191                         a->src[1] = bop.n->src[0];
 192                         a->bc.src[0] = bop.n->bc.src[1];
 193                         a->bc.src[1] = bop.n->bc.src[0];
 194
 195                 } else {
 196                         a->src[0] = bop.n->src[0];
 197                         a->src[1] = bop.n->src[1];
 198                         a->bc.src[0] = bop.n->bc.src[0];
 199                         a->bc.src[1] = bop.n->bc.src[1];
 200                 }
 201         }
 202 }
 203
 204 void peephole::optimize_CNDcc_op(alu_node* a) {
 205         unsigned flags = a->bc.op_ptr->flags;
 206         unsigned cc = flags & AF_CC_MASK;
 207         unsigned cmp_type = flags & AF_CMP_TYPE_MASK;
 208         bool swap = false;
 209
 210         if (cc == AF_CC_E) {
 211                 swap = !swap;
 212                 cc = AF_CC_NE;
 213         } else if (cc != AF_CC_NE)
 214                 return;
 215
 216         value *s = a->src[0];
 217
 218         bool_op_info bop = {};
 219
 220         PPH_DUMP(
 221                 sblog << "cndcc: ";
 222                 dump::dump_op(a);
 223                 sblog << "\n";
 224         );
 225
 226         if (!get_bool_op_info(s, bop))
 227                 return;
 228
 229         alu_node *d = bop.n;
 230
 231         if (d->bc.omod)
 232                 return;
 233
 234         PPH_DUMP(
 235                 sblog << "cndcc def: ";
 236                 dump::dump_op(d);
 237                 sblog << "\n";
 238         );
 239
 240
 241         unsigned dflags = d->bc.op_ptr->flags;
 242         unsigned dcc = dflags & AF_CC_MASK;
 243         unsigned dcmp_type = dflags & AF_CMP_TYPE_MASK;
 244         unsigned ddst_type = dflags & AF_DST_TYPE_MASK;
 245         int nds;
 246
 247         // TODO we can handle some of these cases,
 248         // though probably this shouldn't happen
 249         if (cmp_type != AF_FLOAT_CMP && ddst_type == AF_FLOAT_DST)
 250                 return;
 251
 252         if (d->src[0]->is_const() && d->src[0]->literal_value == literal(0))
 253                 nds = 1;
 254         else if ((d->src[1]->is_const() &&
 255                         d->src[1]->literal_value == literal(0)))
 256                 nds = 0;
 257         else
 258                 return;
 259
 260         // can't propagate ABS modifier to CNDcc because it's OP3
 261         if (d->bc.src[nds].abs)
 262                 return;
 263
 264         // TODO we can handle some cases for uint comparison
 265         if (dcmp_type == AF_UINT_CMP)
 266                 return;
 267
 268         if (dcc == AF_CC_NE) {
 269                 dcc = AF_CC_E;
 270                 swap = !swap;
 271         }
 272
 273         if (nds == 1) {
 274                 switch (dcc) {
 275                 case AF_CC_GT: dcc = AF_CC_GE; swap = !swap; break;
 276                 case AF_CC_GE: dcc = AF_CC_GT; swap = !swap; break;
 277                 default: break;
 278                 }
 279         }
 280
 281         a->src[0] = d->src[nds];
 282         a->bc.src[0] = d->bc.src[nds];
 283
 284         if (swap) {
 285                 std::swap(a->src[1], a->src[2]);
 286                 std::swap(a->bc.src[1], a->bc.src[2]);
 287         }
 288
 289         a->bc.set_op(get_cndcc_op(dcc, dcmp_type));
 290
 291 }
 292
 293 bool peephole::get_bool_flt_to_int_source(alu_node* &a) {
 294
 295         if (a->bc.op == ALU_OP1_FLT_TO_INT) {
 296
 297                 if (a->bc.src[0].neg || a->bc.src[0].abs || a->bc.src[0].rel)
 298                         return false;
 299
 300                 value *s = a->src[0];
 301                 if (!s || !s->def || !s->def->is_alu_inst())
 302                         return false;
 303
 304                 alu_node *dn = static_cast<alu_node*>(s->def);
 305
 306                 if (dn->is_alu_op(ALU_OP1_TRUNC)) {
 307                         s = dn->src[0];
 308                         if (!s || !s->def || !s->def->is_alu_inst())
 309                                 return false;
 310
 311                         if (dn->bc.src[0].neg != 1 || dn->bc.src[0].abs != 0 ||
 312                                         dn->bc.src[0].rel != 0) {
 313                                 return false;
 314                         }
 315
 316                         dn = static_cast<alu_node*>(s->def);
 317
 318                 }
 319
 320                 if (dn->bc.op_ptr->flags & AF_SET) {
 321                         a = dn;
 322                         return true;
 323                 }
 324         }
 325         return false;
 326 }
 327
 328 bool peephole::get_bool_op_info(value* b, bool_op_info& bop) {
 329
 330         node *d = b->def;
 331
 332         if (!d || !d->is_alu_inst())
 333                 return false;
 334
 335         alu_node *dn = static_cast<alu_node*>(d);
 336
 337         if (dn->bc.op_ptr->flags & AF_SET) {
 338                 bop.n = dn;
 339
 340                 if (dn->bc.op_ptr->flags & AF_DX10)
 341                         bop.int_cvt = true;
 342
 343                 return true;
 344         }
 345
 346         if (get_bool_flt_to_int_source(dn)) {
 347                 bop.n = dn;
 348                 bop.int_cvt = true;
 349                 return true;
 350         }
 351
 352         return false;
 353 }
 354
 355 } // namespace r600_sb