27544ea8d3
The VPM write logic will be basically the same as the texture coordinate write logic we need, and it's not really related to the VPM read logic other than the reuse of the use_count array.
120 lines
4.5 KiB
C
120 lines
4.5 KiB
C
/*
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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_opt_vpm.c
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*
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* This modifies instructions that exclusively consume a value read from the
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* VPM to directly read the VPM if other operands allow it.
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*/
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#include "vc4_qir.h"
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bool
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qir_opt_vpm(struct vc4_compile *c)
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{
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if (c->stage == QSTAGE_FRAG)
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return false;
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/* For now, only do this pass when we don't have control flow. */
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struct qblock *block = qir_entry_block(c);
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if (block != qir_exit_block(c))
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return false;
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bool progress = false;
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uint32_t use_count[c->num_temps];
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memset(&use_count, 0, sizeof(use_count));
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qir_for_each_inst_inorder(inst, c) {
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for (int i = 0; i < qir_get_nsrc(inst); i++) {
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if (inst->src[i].file == QFILE_TEMP) {
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uint32_t temp = inst->src[i].index;
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use_count[temp]++;
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}
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}
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}
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/* For instructions reading from a temporary that contains a VPM read
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* result, try to move the instruction up in place of the VPM read.
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*/
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qir_for_each_inst_inorder(inst, c) {
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if (!inst)
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continue;
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if (qir_depends_on_flags(inst) || inst->sf)
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continue;
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if (qir_has_side_effects(c, inst) ||
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qir_has_side_effect_reads(c, inst) ||
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qir_is_tex(inst))
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continue;
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for (int j = 0; j < qir_get_nsrc(inst); j++) {
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if (inst->src[j].file != QFILE_TEMP ||
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inst->src[j].pack)
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continue;
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uint32_t temp = inst->src[j].index;
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/* Since VPM reads pull from a FIFO, we only get to
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* read each VPM entry once (unless we reset the read
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* pointer). That means we can't copy-propagate a VPM
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* read to multiple locations.
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*/
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if (use_count[temp] != 1)
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continue;
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struct qinst *mov = c->defs[temp];
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if (!mov ||
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(mov->op != QOP_MOV &&
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mov->op != QOP_FMOV &&
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mov->op != QOP_MMOV) ||
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mov->src[0].file != QFILE_VPM) {
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continue;
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}
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uint32_t temps = 0;
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for (int k = 0; k < qir_get_nsrc(inst); k++) {
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if (inst->src[k].file == QFILE_TEMP)
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temps++;
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}
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/* The instruction is safe to reorder if its other
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* sources are independent of previous instructions
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*/
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if (temps == 1) {
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inst->src[j] = mov->src[0];
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list_del(&inst->link);
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list_addtail(&inst->link, &mov->link);
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qir_remove_instruction(c, mov);
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progress = true;
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break;
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}
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}
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}
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return progress;
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}
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