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/*
* Copyright © 2017 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.
*/
#include "nir.h"
#include "nir_builder.h"
/**
* \file nir_opt_intrinsics.c
*/
static bool
opt_intrinsics_impl(nir_function_impl *impl)
{
nir_builder b;
nir_builder_init(&b, impl);
bool progress = false;
nir_foreach_block(block, impl) {
nir_foreach_instr_safe(instr, block) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
nir_ssa_def *replacement = NULL;
b.cursor = nir_before_instr(instr);
switch (intrin->intrinsic) {
case nir_intrinsic_vote_any:
case nir_intrinsic_vote_all: {
nir_const_value *val = nir_src_as_const_value(intrin->src[0]);
if (!val && !b.shader->options->lower_vote_trivial)
continue;
replacement = nir_ssa_for_src(&b, intrin->src[0], 1);
break;
}
case nir_intrinsic_vote_eq: {
nir_const_value *val = nir_src_as_const_value(intrin->src[0]);
if (!val && !b.shader->options->lower_vote_trivial)
continue;
replacement = nir_imm_int(&b, NIR_TRUE);
break;
}
case nir_intrinsic_ballot: {
assert(b.shader->options->max_subgroup_size != 0);
if (b.shader->options->max_subgroup_size > 32 ||
intrin->dest.ssa.bit_size <= 32)
continue;
nir_intrinsic_instr *ballot =
nir_intrinsic_instr_create(b.shader, nir_intrinsic_ballot);
nir_ssa_dest_init(&ballot->instr, &ballot->dest, 1, 32, NULL);
nir_src_copy(&ballot->src[0], &intrin->src[0], ballot);
nir_builder_instr_insert(&b, &ballot->instr);
replacement = nir_pack_64_2x32_split(&b,
&ballot->dest.ssa,
nir_imm_int(&b, 0));
break;
}
case nir_intrinsic_load_subgroup_eq_mask:
case nir_intrinsic_load_subgroup_ge_mask:
case nir_intrinsic_load_subgroup_gt_mask:
case nir_intrinsic_load_subgroup_le_mask:
case nir_intrinsic_load_subgroup_lt_mask: {
if (!b.shader->options->lower_subgroup_masks)
break;
nir_ssa_def *count = nir_load_subgroup_invocation(&b);
switch (intrin->intrinsic) {
case nir_intrinsic_load_subgroup_eq_mask:
replacement = nir_ishl(&b, nir_imm_int64(&b, 1ull), count);
break;
case nir_intrinsic_load_subgroup_ge_mask:
replacement = nir_ishl(&b, nir_imm_int64(&b, ~0ull), count);
break;
case nir_intrinsic_load_subgroup_gt_mask:
replacement = nir_ishl(&b, nir_imm_int64(&b, ~1ull), count);
break;
case nir_intrinsic_load_subgroup_le_mask:
replacement = nir_inot(&b, nir_ishl(&b, nir_imm_int64(&b, ~1ull), count));
break;
case nir_intrinsic_load_subgroup_lt_mask:
replacement = nir_inot(&b, nir_ishl(&b, nir_imm_int64(&b, ~0ull), count));
break;
default:
unreachable("you seriously can't tell this is unreachable?");
}
break;
}
default:
break;
}
if (!replacement)
continue;
nir_ssa_def_rewrite_uses(&intrin->dest.ssa,
nir_src_for_ssa(replacement));
nir_instr_remove(instr);
nir_metadata_preserve(impl, nir_metadata_block_index |
nir_metadata_dominance);
progress = true;
}
}
return progress;
}
bool
nir_opt_intrinsics(nir_shader *shader)
{
bool progress = false;
nir_foreach_function(function, shader) {
if (function->impl)
progress |= opt_intrinsics_impl(function->impl);
}
return false;
}
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