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/*
* Copyright © 2014 Broadcom
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
/**
* @file vc4_qir_emit_uniform_stream_resets.c
*
* Adds updates to the uniform stream address at the start of each basic block
* that uses uniforms.
*
* This will be done just before the translation to QPU instructions, once we
* have performed optimization know how many uniforms are used in each block.
*/
#include "vc4_qir.h"
#include "util/hash_table.h"
#include "util/u_math.h"
static bool
inst_reads_a_uniform(struct qinst *inst)
{
if (qir_is_tex(inst))
return true;
for (int i = 0; i < qir_get_op_nsrc(inst->op); i++) {
if (inst->src[i].file == QFILE_UNIF)
return true;
}
return false;
}
static bool
block_reads_any_uniform(struct qblock *block)
{
qir_for_each_inst(inst, block) {
if (inst_reads_a_uniform(inst))
return true;
}
return false;
}
void
qir_emit_uniform_stream_resets(struct vc4_compile *c)
{
uint32_t uniform_count = 0;
qir_for_each_block(block, c) {
if (block != qir_entry_block(c) &&
(block_reads_any_uniform(block) ||
block == qir_exit_block(c))) {
struct qreg t = qir_get_temp(c);
struct qreg uni_addr =
qir_uniform(c, QUNIFORM_UNIFORMS_ADDRESS, 0);
/* Load the offset of the next uniform in the stream
* after the one we're generating here.
*/
struct qinst *load_imm =
qir_inst(QOP_LOAD_IMM,
t,
qir_reg(QFILE_LOAD_IMM,
(uniform_count + 1) * 4),
c->undef);
struct qinst *add =
qir_inst(QOP_UNIFORMS_RESET, c->undef,
t, uni_addr);
/* Pushes to the top of the block, so in reverse
* order.
*/
list_add(&add->link, &block->instructions);
list_add(&load_imm->link, &block->instructions);
}
qir_for_each_inst(inst, block) {
if (inst_reads_a_uniform(inst))
uniform_count++;
}
}
}
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