src/intel/compiler/brw_nir_lower_scoped_barriers.c

   1 /*
   2  * Copyright (c) 2020 Intel Corporation
   3  * Copyright (c) 2020 Collabora Ltd
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  22  * IN THE SOFTWARE.
  23  */
  24
  25 /*
  26  * Lower scoped barriers embedding a control barrier (execusion_scope != NONE)
  27  * to scoped_barriers-without-control-barrier + control_barrier.
  28  */
  29
  30 #include "brw_nir.h"
  31 #include "compiler/nir/nir_builder.h"
  32
  33 static bool
  34 lower_impl(nir_function_impl *impl)
  35 {
  36    nir_builder b;
  37    nir_builder_init(&b, impl);
  38    bool progress = false;
  39
  40    nir_foreach_block(block, impl) {
  41       nir_foreach_instr_safe(instr, block) {
  42          if (instr->type != nir_instr_type_intrinsic)
  43             continue;
  44
  45          nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
  46
  47          if (intr->intrinsic != nir_intrinsic_scoped_barrier ||
  48              nir_intrinsic_execution_scope(intr) == NIR_SCOPE_NONE)
  49             continue;
  50
  51          if (nir_intrinsic_execution_scope(intr) == NIR_SCOPE_WORKGROUP) {
  52             b.cursor = nir_after_instr(&intr->instr);
  53             nir_intrinsic_instr *cbarrier =
  54                nir_intrinsic_instr_create(b.shader,
  55                                           nir_intrinsic_control_barrier);
  56             nir_builder_instr_insert(&b, &cbarrier->instr);
  57          }
  58
  59          nir_intrinsic_set_execution_scope(intr, NIR_SCOPE_NONE);
  60          progress = true;
  61       }
  62    }
  63
  64    if (progress) {
  65       nir_metadata_preserve(impl, nir_metadata_block_index |
  66                                   nir_metadata_dominance);
  67    } else {
  68       nir_metadata_preserve(impl, nir_metadata_all);
  69    }
  70
  71    return progress;
  72 }
  73
  74 bool
  75 brw_nir_lower_scoped_barriers(nir_shader *nir)
  76 {
  77    bool progress = false;
  78
  79    nir_foreach_function(function, nir) {
  80       if (function->impl)
  81          progress |= lower_impl(function->impl);
  82    }
  83
  84    return progress;
  85 }