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      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 }
     88