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/*
* Copyright (c) 2020 Intel Corporation
* Copyright (c) 2020 Collabora 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.
*/
/*
* Lower scoped barriers embedding a control barrier (execusion_scope != NONE)
* to scoped_barriers-without-control-barrier + control_barrier.
*/
#include "brw_nir.h"
#include "compiler/nir/nir_builder.h"
static bool
lower_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 *intr = nir_instr_as_intrinsic(instr);
if (intr->intrinsic != nir_intrinsic_scoped_barrier ||
nir_intrinsic_execution_scope(intr) == NIR_SCOPE_NONE)
continue;
if (nir_intrinsic_execution_scope(intr) == NIR_SCOPE_WORKGROUP) {
b.cursor = nir_after_instr(&intr->instr);
nir_intrinsic_instr *cbarrier =
nir_intrinsic_instr_create(b.shader,
nir_intrinsic_control_barrier);
nir_builder_instr_insert(&b, &cbarrier->instr);
}
nir_intrinsic_set_execution_scope(intr, NIR_SCOPE_NONE);
progress = true;
}
}
if (progress) {
nir_metadata_preserve(impl, nir_metadata_block_index |
nir_metadata_dominance);
} else {
nir_metadata_preserve(impl, nir_metadata_all);
}
return progress;
}
bool
brw_nir_lower_scoped_barriers(nir_shader *nir)
{
bool progress = false;
nir_foreach_function(function, nir) {
if (function->impl)
progress |= lower_impl(function->impl);
}
return progress;
}
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