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