src/gallium/drivers/vc4/vc4_qir_emit_uniform_stream_resets.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 /**
  25  * @file vc4_qir_emit_uniform_stream_resets.c
  26  *
  27  * Adds updates to the uniform stream address at the start of each basic block
  28  * that uses uniforms.
  29  *
  30  * This will be done just before the translation to QPU instructions, once we
  31  * have performed optimization know how many uniforms are used in each block.
  32  */
  33
  34 #include "vc4_qir.h"
  35 #include "util/hash_table.h"
  36 #include "util/u_math.h"
  37
  38 static bool
  39 inst_reads_a_uniform(struct qinst *inst)
  40 {
  41         if (qir_is_tex(inst))
  42                 return true;
  43
  44         for (int i = 0; i < qir_get_op_nsrc(inst->op); i++) {
  45                 if (inst->src[i].file == QFILE_UNIF)
  46                         return true;
  47         }
  48
  49         return false;
  50 }
  51
  52 static bool
  53 block_reads_any_uniform(struct qblock *block)
  54 {
  55         qir_for_each_inst(inst, block) {
  56                 if (inst_reads_a_uniform(inst))
  57                         return true;
  58         }
  59
  60         return false;
  61 }
  62
  63 void
  64 qir_emit_uniform_stream_resets(struct vc4_compile *c)
  65 {
  66         uint32_t uniform_count = 0;
  67
  68         qir_for_each_block(block, c) {
  69                 if (block != qir_entry_block(c) &&
  70                     (block_reads_any_uniform(block) ||
  71                      block == qir_exit_block(c))) {
  72                         struct qreg t = qir_get_temp(c);
  73                         struct qreg uni_addr =
  74                                 qir_uniform(c, QUNIFORM_UNIFORMS_ADDRESS, 0);
  75
  76                         /* Load the offset of the next uniform in the stream
  77                          * after the one we're generating here.
  78                          */
  79                         struct qinst *load_imm =
  80                                 qir_inst(QOP_LOAD_IMM,
  81                                          t,
  82                                          qir_reg(QFILE_LOAD_IMM,
  83                                                  (uniform_count + 1) * 4),
  84                                          c->undef);
  85                         struct qinst *add =
  86                                 qir_inst(QOP_UNIFORMS_RESET, c->undef,
  87                                          t, uni_addr);
  88
  89                         /* Pushes to the top of the block, so in reverse
  90                          * order.
  91                          */
  92                         list_add(&add->link, &block->instructions);
  93                         list_add(&load_imm->link, &block->instructions);
  94                 }
  95
  96                 qir_for_each_inst(inst, block) {
  97                         if (inst_reads_a_uniform(inst))
  98                                 uniform_count++;
  99                 }
 100         }
 101 }