/*
|
* 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_opt_algebraic.c
|
*
|
* This is the optimization pass for miscellaneous changes to instructions
|
* where we can simplify the operation by some knowledge about the specific
|
* operations.
|
*
|
* Mostly this will be a matter of turning things into MOVs so that they can
|
* later be copy-propagated out.
|
*/
|
|
#include "vc4_qir.h"
|
#include "util/u_math.h"
|
|
static bool debug;
|
|
static void
|
dump_from(struct vc4_compile *c, struct qinst *inst)
|
{
|
if (!debug)
|
return;
|
|
fprintf(stderr, "optimizing: ");
|
qir_dump_inst(c, inst);
|
fprintf(stderr, "\n");
|
}
|
|
static void
|
dump_to(struct vc4_compile *c, struct qinst *inst)
|
{
|
if (!debug)
|
return;
|
|
fprintf(stderr, "to: ");
|
qir_dump_inst(c, inst);
|
fprintf(stderr, "\n");
|
}
|
|
static bool
|
is_constant_value(struct vc4_compile *c, struct qreg reg,
|
uint32_t val)
|
{
|
if (reg.file == QFILE_UNIF &&
|
!reg.pack &&
|
c->uniform_contents[reg.index] == QUNIFORM_CONSTANT &&
|
c->uniform_data[reg.index] == val) {
|
return true;
|
}
|
|
if (reg.file == QFILE_SMALL_IMM && reg.index == val)
|
return true;
|
|
return false;
|
}
|
|
static bool
|
is_zero(struct vc4_compile *c, struct qreg reg)
|
{
|
reg = qir_follow_movs(c, reg);
|
return is_constant_value(c, reg, 0);
|
}
|
|
static bool
|
is_1f(struct vc4_compile *c, struct qreg reg)
|
{
|
reg = qir_follow_movs(c, reg);
|
return is_constant_value(c, reg, fui(1.0));
|
}
|
|
static void
|
replace_with_mov(struct vc4_compile *c, struct qinst *inst, struct qreg arg)
|
{
|
dump_from(c, inst);
|
|
inst->src[0] = arg;
|
if (qir_has_implicit_tex_uniform(inst))
|
inst->src[1] = inst->src[qir_get_tex_uniform_src(inst)];
|
|
if (qir_is_mul(inst))
|
inst->op = QOP_MMOV;
|
else if (qir_is_float_input(inst))
|
inst->op = QOP_FMOV;
|
else
|
inst->op = QOP_MOV;
|
dump_to(c, inst);
|
}
|
|
static bool
|
replace_x_0_with_x(struct vc4_compile *c,
|
struct qinst *inst,
|
int arg)
|
{
|
if (!is_zero(c, inst->src[arg]))
|
return false;
|
replace_with_mov(c, inst, inst->src[1 - arg]);
|
return true;
|
}
|
|
static bool
|
replace_x_0_with_0(struct vc4_compile *c,
|
struct qinst *inst,
|
int arg)
|
{
|
if (!is_zero(c, inst->src[arg]))
|
return false;
|
replace_with_mov(c, inst, inst->src[arg]);
|
return true;
|
}
|
|
static bool
|
fmul_replace_one(struct vc4_compile *c,
|
struct qinst *inst,
|
int arg)
|
{
|
if (!is_1f(c, inst->src[arg]))
|
return false;
|
replace_with_mov(c, inst, inst->src[1 - arg]);
|
return true;
|
}
|
|
bool
|
qir_opt_algebraic(struct vc4_compile *c)
|
{
|
bool progress = false;
|
|
qir_for_each_inst_inorder(inst, c) {
|
switch (inst->op) {
|
case QOP_FMIN:
|
if (is_1f(c, inst->src[1]) &&
|
inst->src[0].pack >= QPU_UNPACK_8D_REP &&
|
inst->src[0].pack <= QPU_UNPACK_8D) {
|
replace_with_mov(c, inst, inst->src[0]);
|
progress = true;
|
}
|
break;
|
|
case QOP_FMAX:
|
if (is_zero(c, inst->src[1]) &&
|
inst->src[0].pack >= QPU_UNPACK_8D_REP &&
|
inst->src[0].pack <= QPU_UNPACK_8D) {
|
replace_with_mov(c, inst, inst->src[0]);
|
progress = true;
|
}
|
break;
|
|
case QOP_FSUB:
|
case QOP_SUB:
|
if (is_zero(c, inst->src[1])) {
|
replace_with_mov(c, inst, inst->src[0]);
|
progress = true;
|
}
|
break;
|
|
case QOP_ADD:
|
/* Kernel validation requires that we use an actual
|
* add instruction.
|
*/
|
if (inst->dst.file != QFILE_TEX_S_DIRECT &&
|
(replace_x_0_with_x(c, inst, 0) ||
|
replace_x_0_with_x(c, inst, 1))) {
|
progress = true;
|
break;
|
}
|
break;
|
|
case QOP_FADD:
|
if (replace_x_0_with_x(c, inst, 0) ||
|
replace_x_0_with_x(c, inst, 1)) {
|
progress = true;
|
break;
|
}
|
|
/* FADD(a, FSUB(0, b)) -> FSUB(a, b) */
|
if (inst->src[1].file == QFILE_TEMP &&
|
c->defs[inst->src[1].index] &&
|
c->defs[inst->src[1].index]->op == QOP_FSUB) {
|
struct qinst *fsub = c->defs[inst->src[1].index];
|
if (is_zero(c, fsub->src[0])) {
|
dump_from(c, inst);
|
inst->op = QOP_FSUB;
|
inst->src[1] = fsub->src[1];
|
progress = true;
|
dump_to(c, inst);
|
break;
|
}
|
}
|
|
/* FADD(FSUB(0, b), a) -> FSUB(a, b) */
|
if (inst->src[0].file == QFILE_TEMP &&
|
c->defs[inst->src[0].index] &&
|
c->defs[inst->src[0].index]->op == QOP_FSUB) {
|
struct qinst *fsub = c->defs[inst->src[0].index];
|
if (is_zero(c, fsub->src[0])) {
|
dump_from(c, inst);
|
inst->op = QOP_FSUB;
|
inst->src[0] = inst->src[1];
|
inst->src[1] = fsub->src[1];
|
dump_to(c, inst);
|
progress = true;
|
break;
|
}
|
}
|
break;
|
|
case QOP_FMUL:
|
if (!inst->dst.pack &&
|
(replace_x_0_with_0(c, inst, 0) ||
|
replace_x_0_with_0(c, inst, 1) ||
|
fmul_replace_one(c, inst, 0) ||
|
fmul_replace_one(c, inst, 1))) {
|
progress = true;
|
break;
|
}
|
break;
|
|
case QOP_MUL24:
|
if (!inst->dst.pack &&
|
(replace_x_0_with_0(c, inst, 0) ||
|
replace_x_0_with_0(c, inst, 1))) {
|
progress = true;
|
break;
|
}
|
break;
|
|
case QOP_AND:
|
if (replace_x_0_with_0(c, inst, 0) ||
|
replace_x_0_with_0(c, inst, 1)) {
|
progress = true;
|
break;
|
}
|
|
if (is_constant_value(c, inst->src[0], ~0)) {
|
replace_with_mov(c, inst, inst->src[1]);
|
progress = true;
|
break;
|
}
|
if (is_constant_value(c, inst->src[1], ~0)) {
|
replace_with_mov(c, inst, inst->src[0]);
|
progress = true;
|
break;
|
}
|
break;
|
|
case QOP_OR:
|
if (replace_x_0_with_x(c, inst, 0) ||
|
replace_x_0_with_x(c, inst, 1)) {
|
progress = true;
|
break;
|
}
|
break;
|
|
case QOP_RCP:
|
if (is_1f(c, inst->src[0])) {
|
replace_with_mov(c, inst, inst->src[0]);
|
progress = true;
|
break;
|
}
|
break;
|
|
default:
|
break;
|
}
|
}
|
|
return progress;
|
}
|
