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Member "mesa-20.1.8/src/gallium/drivers/vc4/vc4_opt_constant_folding.c" (16 Sep 2020, 3116 Bytes) of package /linux/misc/mesa-20.1.8.tar.xz:


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    1 /*
    2  * Copyright © 2015 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 /**
   25  * @file vc4_opt_constant_folding.c
   26  *
   27  * Simple constant folding pass to clean up operations on only constants,
   28  * which we might have generated within vc4_program.c.
   29  */
   30 
   31 #include "vc4_qir.h"
   32 #include "util/u_math.h"
   33 
   34 static bool debug;
   35 
   36 static void
   37 dump_from(struct vc4_compile *c, struct qinst *inst)
   38 {
   39         if (!debug)
   40                 return;
   41 
   42         fprintf(stderr, "optimizing: ");
   43         qir_dump_inst(c, inst);
   44         fprintf(stderr, "\n");
   45 }
   46 
   47 static void
   48 dump_to(struct vc4_compile *c, struct qinst *inst)
   49 {
   50         if (!debug)
   51                 return;
   52 
   53         fprintf(stderr, "to: ");
   54         qir_dump_inst(c, inst);
   55         fprintf(stderr, "\n");
   56 }
   57 
   58 static bool
   59 constant_fold(struct vc4_compile *c, struct qinst *inst)
   60 {
   61         int nsrc = qir_get_nsrc(inst);
   62         uint32_t ui[nsrc];
   63 
   64         for (int i = 0; i < nsrc; i++) {
   65                 struct qreg reg = inst->src[i];
   66                 if (reg.file == QFILE_UNIF &&
   67                     c->uniform_contents[reg.index] == QUNIFORM_CONSTANT) {
   68                         ui[i] = c->uniform_data[reg.index];
   69                 } else if (reg.file == QFILE_SMALL_IMM) {
   70                         ui[i] = reg.index;
   71                 } else {
   72                         return false;
   73                 }
   74         }
   75 
   76         uint32_t result = 0;
   77         switch (inst->op) {
   78         case QOP_SHR:
   79                 result = ui[0] >> ui[1];
   80                 break;
   81 
   82         default:
   83                 return false;
   84         }
   85 
   86         dump_from(c, inst);
   87 
   88         inst->src[0] = qir_uniform_ui(c, result);
   89         for (int i = 1; i < nsrc; i++)
   90                 inst->src[i] = c->undef;
   91         inst->op = QOP_MOV;
   92 
   93         dump_to(c, inst);
   94         return true;
   95 }
   96 
   97 bool
   98 qir_opt_constant_folding(struct vc4_compile *c)
   99 {
  100         bool progress = false;
  101 
  102         qir_for_each_inst_inorder(inst, c) {
  103                 if (constant_fold(c, inst))
  104                         progress = true;
  105         }
  106 
  107         return progress;
  108 }