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/*
* Copyright © 2022 Imagination Technologies Ltd.
*
* 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/nir.h"
#include "nir/nir_builder.h"
#include "nir/nir_search_helpers.h"
#include "rogue.h"
#include "util/macros.h"
#include <assert.h>
#include <stdbool.h>
#include <stdint.h>
/**
* \file rogue_nir_lower_io.c
*
* \brief Contains the rogue_nir_lower_io pass.
*/
static void lower_vulkan_resource_index(nir_builder *b,
nir_intrinsic_instr *intr)
{
/* Pass along the desc_set, binding, desc_type. */
unsigned desc_set = nir_intrinsic_desc_set(intr);
unsigned binding = nir_intrinsic_binding(intr);
unsigned desc_type = nir_intrinsic_desc_type(intr);
nir_ssa_def *def = nir_vec3(b,
nir_imm_int(b, desc_set),
nir_imm_int(b, binding),
nir_imm_int(b, desc_type));
nir_ssa_def_rewrite_uses(&intr->dest.ssa, def);
nir_instr_remove(&intr->instr);
}
static void lower_load_global_constant_to_scalar(nir_builder *b,
nir_intrinsic_instr *intr)
{
/* Scalarize the load_global_constant. */
b->cursor = nir_before_instr(&intr->instr);
assert(intr->dest.is_ssa);
assert(intr->num_components > 1);
nir_ssa_def *loads[NIR_MAX_VEC_COMPONENTS];
for (uint8_t i = 0; i < intr->num_components; i++) {
nir_intrinsic_instr *chan_intr =
nir_intrinsic_instr_create(b->shader, intr->intrinsic);
nir_ssa_dest_init(&chan_intr->instr, &chan_intr->dest, 1,
intr->dest.ssa.bit_size);
chan_intr->num_components = 1;
nir_intrinsic_set_access(chan_intr, nir_intrinsic_access(intr));
nir_intrinsic_set_align_mul(chan_intr, nir_intrinsic_align_mul(intr));
nir_intrinsic_set_align_offset(chan_intr,
nir_intrinsic_align_offset(intr));
/* Address. */
chan_intr->src[0] =
nir_src_for_ssa(nir_iadd_imm(b, intr->src[0].ssa, i * 4));
nir_builder_instr_insert(b, &chan_intr->instr);
loads[i] = &chan_intr->dest.ssa;
}
nir_ssa_def_rewrite_uses(&intr->dest.ssa,
nir_vec(b, loads, intr->num_components));
nir_instr_remove(&intr->instr);
}
static bool lower_intrinsic(nir_builder *b, nir_intrinsic_instr *instr)
{
switch (instr->intrinsic) {
case nir_intrinsic_vulkan_resource_index:
lower_vulkan_resource_index(b, instr);
return true;
case nir_intrinsic_load_global_constant:
lower_load_global_constant_to_scalar(b, instr);
return true;
default:
break;
}
return false;
}
static bool lower_impl(nir_function_impl *impl)
{
bool progress = false;
nir_builder b;
nir_builder_init(&b, impl);
nir_foreach_block (block, impl) {
nir_foreach_instr_safe (instr, block) {
b.cursor = nir_before_instr(instr);
switch (instr->type) {
case nir_instr_type_intrinsic:
progress |= lower_intrinsic(&b, nir_instr_as_intrinsic(instr));
break;
default:
break;
}
}
}
if (progress)
nir_metadata_preserve(impl, nir_metadata_none);
else
nir_metadata_preserve(impl, nir_metadata_all);
return progress;
}
PUBLIC
bool rogue_nir_lower_io(nir_shader *shader)
{
bool progress = false;
nir_foreach_function (function, shader) {
if (function->impl)
progress |= lower_impl(function->impl);
}
if (progress)
nir_opt_dce(shader);
return progress;
}
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