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/*
* Copyright © 2014 Intel Corporation
* Copyright © 2023 Igalia S.L.
*
* 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.
*/
#include "etnaviv_nir.h"
#include "etnaviv_compiler_nir.h"
/*
* This pass lowers the neg and abs operations to pass_flags on
* ALU operations.
*/
static void
alu_src_consume_abs(nir_instr *instr, unsigned idx)
{
set_src_mod_abs(instr, idx);
}
static void
alu_src_consume_negate(nir_instr *instr, unsigned idx)
{
/* If abs is set on the source, the negate goes away */
if (!is_src_mod_abs(instr, idx))
toggle_src_mod_neg(instr, idx);
}
static bool
nir_lower_to_source_mods_instr(nir_builder *b, nir_instr *instr,
void *data)
{
bool progress = false;
if (instr->type != nir_instr_type_alu)
return false;
nir_alu_instr *alu = nir_instr_as_alu(instr);
for (unsigned i = 0; i < nir_op_infos[alu->op].num_inputs; i++) {
if (alu->src[i].src.ssa->parent_instr->type != nir_instr_type_alu)
continue;
nir_alu_instr *parent = nir_instr_as_alu(alu->src[i].src.ssa->parent_instr);
if (nir_alu_type_get_base_type(nir_op_infos[alu->op].input_types[i]) != nir_type_float)
continue;
if (!(parent->op == nir_op_fabs) &&
!(parent->op == nir_op_fneg)) {
continue;
}
if (nir_src_bit_size(alu->src[i].src) == 64)
continue;
/* We can only store up to 3 source modifiers. */
if (i >= 3)
continue;
nir_src_rewrite(&alu->src[i].src, parent->src[0].src.ssa);
/* Apply any modifiers that come from the parent opcode */
if (parent->op == nir_op_fneg)
alu_src_consume_negate(instr, i);
if (parent->op == nir_op_fabs)
alu_src_consume_abs(instr, i);
/* Apply modifiers from the parent source */
if (is_src_mod_neg(&parent->instr, 0))
alu_src_consume_negate(instr, i);
if (is_src_mod_abs(&parent->instr, 0))
alu_src_consume_abs(instr, i);
for (int j = 0; j < 4; ++j) {
if (!nir_alu_instr_channel_used(alu, i, j))
continue;
alu->src[i].swizzle[j] = parent->src[0].swizzle[alu->src[i].swizzle[j]];
}
if (nir_def_is_unused(&parent->def))
nir_instr_remove(&parent->instr);
progress = true;
}
return progress;
}
bool
etna_nir_lower_to_source_mods(nir_shader *shader)
{
nir_shader_clear_pass_flags(shader);
return nir_shader_instructions_pass(shader,
nir_lower_to_source_mods_instr,
nir_metadata_block_index |
nir_metadata_dominance,
NULL);
}
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