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/*
* Copyright © 2014 Intel Corporation
*
* 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.
*
* Authors:
* Connor Abbott (cwabbott0@gmail.com)
*
*/
#include "compiler/nir/nir.h"
#include "compiler/nir/nir_builder.h"
#include "gl_nir.h"
#include "ir_uniform.h"
#include "main/config.h"
#include "main/mtypes.h"
#include <assert.h>
/*
* replace atomic counter intrinsics that use a variable with intrinsics
* that directly store the buffer index and byte offset
*/
static bool
lower_deref_instr(nir_builder *b, nir_intrinsic_instr *instr,
const struct gl_shader_program *shader_program,
nir_shader *shader, bool use_binding_as_idx)
{
nir_intrinsic_op op;
switch (instr->intrinsic) {
case nir_intrinsic_atomic_counter_read_deref:
op = nir_intrinsic_atomic_counter_read;
break;
case nir_intrinsic_atomic_counter_inc_deref:
op = nir_intrinsic_atomic_counter_inc;
break;
case nir_intrinsic_atomic_counter_dec_deref:
op = nir_intrinsic_atomic_counter_dec;
break;
case nir_intrinsic_atomic_counter_add_deref:
op = nir_intrinsic_atomic_counter_add;
break;
case nir_intrinsic_atomic_counter_min_deref:
op = nir_intrinsic_atomic_counter_min;
break;
case nir_intrinsic_atomic_counter_max_deref:
op = nir_intrinsic_atomic_counter_max;
break;
case nir_intrinsic_atomic_counter_and_deref:
op = nir_intrinsic_atomic_counter_and;
break;
case nir_intrinsic_atomic_counter_or_deref:
op = nir_intrinsic_atomic_counter_or;
break;
case nir_intrinsic_atomic_counter_xor_deref:
op = nir_intrinsic_atomic_counter_xor;
break;
case nir_intrinsic_atomic_counter_exchange_deref:
op = nir_intrinsic_atomic_counter_exchange;
break;
case nir_intrinsic_atomic_counter_comp_swap_deref:
op = nir_intrinsic_atomic_counter_comp_swap;
break;
default:
return false;
}
nir_deref_instr *deref = nir_src_as_deref(instr->src[0]);
nir_variable *var = nir_deref_instr_get_variable(deref);
if (var->data.mode != nir_var_uniform &&
var->data.mode != nir_var_shader_storage &&
var->data.mode != nir_var_shared)
return false; /* atomics passed as function arguments can't be lowered */
const unsigned uniform_loc = var->data.location;
const unsigned idx = use_binding_as_idx ? var->data.binding :
shader_program->data->UniformStorage[uniform_loc].opaque[shader->info.stage].index;
b->cursor = nir_before_instr(&instr->instr);
nir_ssa_def *offset = nir_imm_int(b, var->data.offset);
for (nir_deref_instr *d = deref; d->deref_type != nir_deref_type_var;
d = nir_deref_instr_parent(d)) {
assert(d->deref_type == nir_deref_type_array);
assert(d->arr.index.is_ssa);
unsigned array_stride = ATOMIC_COUNTER_SIZE;
if (glsl_type_is_array(d->type))
array_stride *= glsl_get_aoa_size(d->type);
offset = nir_iadd(b, offset, nir_imul(b, d->arr.index.ssa,
nir_imm_int(b, array_stride)));
}
/* Since the first source is a deref and the first source in the lowered
* instruction is the offset, we can just swap it out and change the
* opcode.
*/
instr->intrinsic = op;
nir_instr_rewrite_src(&instr->instr, &instr->src[0],
nir_src_for_ssa(offset));
nir_intrinsic_set_base(instr, idx);
nir_deref_instr_remove_if_unused(deref);
return true;
}
bool
gl_nir_lower_atomics(nir_shader *shader,
const struct gl_shader_program *shader_program,
bool use_binding_as_idx)
{
bool progress = false;
nir_assert_unlowered_derefs(shader, nir_lower_atomic_counter_derefs);
nir_foreach_function(function, shader) {
if (!function->impl)
continue;
bool impl_progress = false;
nir_builder build;
nir_builder_init(&build, function->impl);
nir_foreach_block(block, function->impl) {
nir_foreach_instr_safe(instr, block) {
if (instr->type != nir_instr_type_intrinsic)
continue;
impl_progress |= lower_deref_instr(&build,
nir_instr_as_intrinsic(instr),
shader_program, shader,
use_binding_as_idx);
}
}
if (impl_progress) {
nir_metadata_preserve(function->impl, nir_metadata_block_index |
nir_metadata_dominance);
progress = true;
}
}
return progress;
}
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