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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:
* Jason Ekstrand (jason@jlekstrand.net)
*
*/
#include "nir.h"
#include "nir_builder.h"
#include "nir_deref.h"
#include "compiler/nir_types.h"
/*
* Lowers all copy intrinsics to sequences of load/store intrinsics.
*/
static nir_deref_instr *
build_deref_to_next_wildcard(nir_builder *b,
nir_deref_instr *parent,
nir_deref_instr ***deref_arr)
{
for (; **deref_arr; (*deref_arr)++) {
if ((**deref_arr)->deref_type == nir_deref_type_array_wildcard)
return parent;
parent = nir_build_deref_follower(b, parent, **deref_arr);
}
assert(**deref_arr == NULL);
*deref_arr = NULL;
return parent;
}
static void
emit_deref_copy_load_store(nir_builder *b,
nir_deref_instr *dst_deref,
nir_deref_instr **dst_deref_arr,
nir_deref_instr *src_deref,
nir_deref_instr **src_deref_arr)
{
if (dst_deref_arr || src_deref_arr) {
assert(dst_deref_arr && src_deref_arr);
dst_deref = build_deref_to_next_wildcard(b, dst_deref, &dst_deref_arr);
src_deref = build_deref_to_next_wildcard(b, src_deref, &src_deref_arr);
}
if (dst_deref_arr || src_deref_arr) {
assert(dst_deref_arr && src_deref_arr);
assert((*dst_deref_arr)->deref_type == nir_deref_type_array_wildcard);
assert((*src_deref_arr)->deref_type == nir_deref_type_array_wildcard);
unsigned length = glsl_get_length(src_deref->type);
/* The wildcards should represent the same number of elements */
assert(length == glsl_get_length(dst_deref->type));
assert(length > 0);
for (unsigned i = 0; i < length; i++) {
nir_ssa_def *index = nir_imm_int(b, i);
emit_deref_copy_load_store(b,
nir_build_deref_array(b, dst_deref, index),
dst_deref_arr + 1,
nir_build_deref_array(b, src_deref, index),
src_deref_arr + 1);
}
} else {
assert(dst_deref->type == src_deref->type);
assert(glsl_type_is_vector_or_scalar(dst_deref->type));
nir_store_deref(b, dst_deref, nir_load_deref(b, src_deref), ~0);
}
}
void
nir_lower_deref_copy_instr(nir_builder *b, nir_intrinsic_instr *copy)
{
/* Unfortunately, there's just no good way to handle wildcards except to
* flip the chain around and walk the list from variable to final pointer.
*/
assert(copy->src[0].is_ssa && copy->src[1].is_ssa);
nir_deref_instr *dst = nir_instr_as_deref(copy->src[0].ssa->parent_instr);
nir_deref_instr *src = nir_instr_as_deref(copy->src[1].ssa->parent_instr);
nir_deref_path dst_path, src_path;
nir_deref_path_init(&dst_path, dst, NULL);
nir_deref_path_init(&src_path, src, NULL);
b->cursor = nir_before_instr(©->instr);
emit_deref_copy_load_store(b, dst_path.path[0], &dst_path.path[1],
src_path.path[0], &src_path.path[1]);
nir_deref_path_finish(&dst_path);
nir_deref_path_finish(&src_path);
}
static bool
lower_var_copies_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) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *copy = nir_instr_as_intrinsic(instr);
if (copy->intrinsic != nir_intrinsic_copy_deref)
continue;
nir_lower_deref_copy_instr(&b, copy);
nir_instr_remove(©->instr);
nir_deref_instr_remove_if_unused(nir_src_as_deref(copy->src[0]));
nir_deref_instr_remove_if_unused(nir_src_as_deref(copy->src[1]));
progress = true;
ralloc_free(copy);
}
}
if (progress)
nir_metadata_preserve(impl, nir_metadata_block_index |
nir_metadata_dominance);
return progress;
}
/* Lowers every copy_var instruction in the program to a sequence of
* load/store instructions.
*/
bool
nir_lower_var_copies(nir_shader *shader)
{
bool progress = false;
nir_foreach_function(function, shader) {
if (function->impl)
progress |= lower_var_copies_impl(function->impl);
}
return progress;
}
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