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/*
* Copyright © 2016 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.
*/
#include "nir.h"
#include "nir_builder.h"
/** @file nir_lower_io_to_scalar.c
*
* Replaces nir_load_input/nir_store_output operations with num_components !=
* 1 with individual per-channel operations.
*/
static void
lower_load_input_to_scalar(nir_builder *b, nir_intrinsic_instr *intr)
{
b->cursor = nir_before_instr(&intr->instr);
assert(intr->dest.is_ssa);
nir_ssa_def *loads[4];
for (unsigned 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, NULL);
chan_intr->num_components = 1;
nir_intrinsic_set_base(chan_intr, nir_intrinsic_base(intr));
nir_intrinsic_set_component(chan_intr, nir_intrinsic_component(intr) + i);
/* offset */
chan_intr->src[0] = intr->src[0];
nir_builder_instr_insert(b, &chan_intr->instr);
loads[i] = &chan_intr->dest.ssa;
}
nir_ssa_def_rewrite_uses(&intr->dest.ssa,
nir_src_for_ssa(nir_vec(b, loads,
intr->num_components)));
nir_instr_remove(&intr->instr);
}
static void
lower_store_output_to_scalar(nir_builder *b, nir_intrinsic_instr *intr)
{
b->cursor = nir_before_instr(&intr->instr);
nir_ssa_def *value = nir_ssa_for_src(b, intr->src[0], intr->num_components);
for (unsigned i = 0; i < intr->num_components; i++) {
if (!(nir_intrinsic_write_mask(intr) & (1 << i)))
continue;
nir_intrinsic_instr *chan_intr =
nir_intrinsic_instr_create(b->shader, intr->intrinsic);
chan_intr->num_components = 1;
nir_intrinsic_set_base(chan_intr, nir_intrinsic_base(intr));
nir_intrinsic_set_write_mask(chan_intr, 0x1);
nir_intrinsic_set_component(chan_intr, nir_intrinsic_component(intr) + i);
/* value */
chan_intr->src[0] = nir_src_for_ssa(nir_channel(b, value, i));
/* offset */
chan_intr->src[1] = intr->src[1];
nir_builder_instr_insert(b, &chan_intr->instr);
}
nir_instr_remove(&intr->instr);
}
void
nir_lower_io_to_scalar(nir_shader *shader, nir_variable_mode mask)
{
nir_foreach_function(function, shader) {
if (function->impl) {
nir_builder b;
nir_builder_init(&b, function->impl);
nir_foreach_block(block, function->impl) {
nir_foreach_instr_safe(instr, block) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
if (intr->num_components == 1)
continue;
switch (intr->intrinsic) {
case nir_intrinsic_load_input:
if (mask & nir_var_shader_in)
lower_load_input_to_scalar(&b, intr);
break;
case nir_intrinsic_store_output:
if (mask & nir_var_shader_out)
lower_store_output_to_scalar(&b, intr);
break;
default:
break;
}
}
}
}
}
}
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