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/*
* Copyright © 2019 Vasily Khoruzhick <anarsoul@gmail.com>
*
* 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 "nir.h"
#include "nir_builder.h"
#include "lima_ir.h"
static bool
lima_nir_split_load_input_block(nir_block *block, nir_builder *b)
{
bool progress = false;
nir_foreach_instr_safe(instr, block) {
if (instr->type != nir_instr_type_alu)
continue;
nir_alu_instr *alu = nir_instr_as_alu(instr);
if (alu->op != nir_op_mov)
continue;
if (!alu->dest.dest.is_ssa)
continue;
if (!alu->src[0].src.is_ssa)
continue;
nir_ssa_def *ssa = alu->src[0].src.ssa;
if (ssa->parent_instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(ssa->parent_instr);
if (intrin->intrinsic != nir_intrinsic_load_input)
continue;
uint8_t swizzle = alu->src[0].swizzle[0];
int i;
for (i = 1; i < nir_dest_num_components(alu->dest.dest); i++)
if (alu->src[0].swizzle[i] != (swizzle + i))
break;
if (i != nir_dest_num_components(alu->dest.dest))
continue;
/* mali4xx can't access unaligned vec3, don't split load input */
if (nir_dest_num_components(alu->dest.dest) == 3 && swizzle > 0)
continue;
b->cursor = nir_before_instr(&intrin->instr);
nir_intrinsic_instr *new_intrin = nir_intrinsic_instr_create(
b->shader,
intrin->intrinsic);
nir_ssa_dest_init(&new_intrin->instr, &new_intrin->dest,
nir_dest_num_components(alu->dest.dest),
ssa->bit_size,
NULL);
new_intrin->num_components = nir_dest_num_components(alu->dest.dest);
nir_intrinsic_set_base(new_intrin, nir_intrinsic_base(intrin));
nir_intrinsic_set_component(new_intrin, nir_intrinsic_component(intrin) + swizzle);
nir_intrinsic_set_type(new_intrin, nir_intrinsic_type(intrin));
/* offset */
nir_src_copy(&new_intrin->src[0], &intrin->src[0], new_intrin);
nir_builder_instr_insert(b, &new_intrin->instr);
nir_ssa_def_rewrite_uses(&alu->dest.dest.ssa,
nir_src_for_ssa(&new_intrin->dest.ssa));
nir_instr_remove(&alu->instr);
progress = true;
}
return progress;
}
static bool
lima_nir_split_load_input_impl(nir_function_impl *impl)
{
bool progress = false;
nir_builder builder;
nir_builder_init(&builder, impl);
nir_foreach_block(block, impl) {
progress |= lima_nir_split_load_input_block(block, &builder);
}
nir_metadata_preserve(impl, nir_metadata_block_index |
nir_metadata_dominance);
return progress;
}
/* Replaces a single load of several packed varyings and number of movs with
* a number of loads of smaller size
*/
bool
lima_nir_split_load_input(nir_shader *shader)
{
bool progress = false;
nir_foreach_function(function, shader) {
if (function->impl)
progress |= lima_nir_split_load_input_impl(function->impl);
}
return progress;
}
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