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 block_reads_any_uniform(struct qblock *block)
  40 {
  41         qir_for_each_inst(inst, block) {
  42                 if (qir_has_uniform_read(inst))
  43                         return true;
  44         }
  45
  46         return false;
  47 }
  48
  49 void
  50 qir_emit_uniform_stream_resets(struct vc4_compile *c)
  51 {
  52         uint32_t uniform_count = 0;
  53
  54         qir_for_each_block(block, c) {
  55                 if (block != qir_entry_block(c) &&
  56                     (block_reads_any_uniform(block) ||
  57                      block == qir_exit_block(c))) {
  58                         struct qreg t = qir_get_temp(c);
  59                         struct qreg uni_addr =
  60                                 qir_uniform(c, QUNIFORM_UNIFORMS_ADDRESS, 0);
  61
  62                         /* Load the offset of the next uniform in the stream
  63                          * after the one we're generating here.
  64                          */
  65                         struct qinst *load_imm =
  66                                 qir_inst(QOP_LOAD_IMM,
  67                                          t,
  68                                          qir_reg(QFILE_LOAD_IMM,
  69                                                  (uniform_count + 1) * 4),
  70                                          c->undef);
  71                         struct qinst *add =
  72                                 qir_inst(QOP_UNIFORMS_RESET, c->undef,
  73                                          t, uni_addr);
  74
  75                         /* Pushes to the top of the block, so in reverse
  76                          * order.
  77                          */
  78                         list_add(&add->link, &block->instructions);
  79                         list_add(&load_imm->link, &block->instructions);
  80                 }
  81
  82                 qir_for_each_inst(inst, block) {
  83                         if (qir_has_uniform_read(inst))
  84                                 uniform_count++;
  85                 }
  86         }
  87 }