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  1. /*
  2.  * Copyright © 2014 Intel Corporation
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8.  * and/or sell copies of the Software, and to permit persons to whom the
  9.  * Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice (including the next
  12.  * paragraph) shall be included in all copies or substantial portions of the
  13.  * Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21.  * IN THE SOFTWARE.
  22.  *
  23.  * Authors:
  24.  *    Connor Abbott (cwabbott0@gmail.com)
  25.  *
  26.  */
  27.  
  28. #include "nir.h"
  29. #include "main/config.h"
  30. #include <assert.h>
  31.  
  32. /*
  33.  * replace atomic counter intrinsics that use a variable with intrinsics
  34.  * that directly store the buffer index and byte offset
  35.  */
  36.  
  37. static void
  38. lower_instr(nir_intrinsic_instr *instr, nir_function_impl *impl)
  39. {
  40.    nir_intrinsic_op op;
  41.    switch (instr->intrinsic) {
  42.    case nir_intrinsic_atomic_counter_read_var:
  43.       op = nir_intrinsic_atomic_counter_read;
  44.       break;
  45.  
  46.    case nir_intrinsic_atomic_counter_inc_var:
  47.       op = nir_intrinsic_atomic_counter_inc;
  48.       break;
  49.  
  50.    case nir_intrinsic_atomic_counter_dec_var:
  51.       op = nir_intrinsic_atomic_counter_dec;
  52.       break;
  53.  
  54.    default:
  55.       return;
  56.    }
  57.  
  58.    if (instr->variables[0]->var->data.mode != nir_var_uniform)
  59.       return; /* atomics passed as function arguments can't be lowered */
  60.  
  61.    void *mem_ctx = ralloc_parent(instr);
  62.  
  63.    nir_intrinsic_instr *new_instr = nir_intrinsic_instr_create(mem_ctx, op);
  64.    new_instr->const_index[0] =
  65.       (int) instr->variables[0]->var->data.atomic.buffer_index;
  66.  
  67.    nir_load_const_instr *offset_const = nir_load_const_instr_create(mem_ctx, 1);
  68.    offset_const->value.u[0] = instr->variables[0]->var->data.atomic.offset;
  69.  
  70.    nir_instr_insert_before(&instr->instr, &offset_const->instr);
  71.  
  72.    nir_ssa_def *offset_def = &offset_const->def;
  73.  
  74.    if (instr->variables[0]->deref.child != NULL) {
  75.       assert(instr->variables[0]->deref.child->deref_type ==
  76.              nir_deref_type_array);
  77.       nir_deref_array *deref_array =
  78.          nir_deref_as_array(instr->variables[0]->deref.child);
  79.       assert(deref_array->deref.child == NULL);
  80.  
  81.       offset_const->value.u[0] +=
  82.          deref_array->base_offset * ATOMIC_COUNTER_SIZE;
  83.  
  84.       if (deref_array->deref_array_type == nir_deref_array_type_indirect) {
  85.          nir_load_const_instr *atomic_counter_size =
  86.                nir_load_const_instr_create(mem_ctx, 1);
  87.          atomic_counter_size->value.u[0] = ATOMIC_COUNTER_SIZE;
  88.          nir_instr_insert_before(&instr->instr, &atomic_counter_size->instr);
  89.  
  90.          nir_alu_instr *mul = nir_alu_instr_create(mem_ctx, nir_op_imul);
  91.          nir_ssa_dest_init(&mul->instr, &mul->dest.dest, 1, NULL);
  92.          mul->dest.write_mask = 0x1;
  93.          nir_src_copy(&mul->src[0].src, &deref_array->indirect, mem_ctx);
  94.          mul->src[1].src.is_ssa = true;
  95.          mul->src[1].src.ssa = &atomic_counter_size->def;
  96.          nir_instr_insert_before(&instr->instr, &mul->instr);
  97.  
  98.          nir_alu_instr *add = nir_alu_instr_create(mem_ctx, nir_op_iadd);
  99.          nir_ssa_dest_init(&add->instr, &add->dest.dest, 1, NULL);
  100.          add->dest.write_mask = 0x1;
  101.          add->src[0].src.is_ssa = true;
  102.          add->src[0].src.ssa = &mul->dest.dest.ssa;
  103.          add->src[1].src.is_ssa = true;
  104.          add->src[1].src.ssa = &offset_const->def;
  105.          nir_instr_insert_before(&instr->instr, &add->instr);
  106.  
  107.          offset_def = &add->dest.dest.ssa;
  108.       }
  109.    }
  110.  
  111.    new_instr->src[0].is_ssa = true;
  112.    new_instr->src[0].ssa = offset_def;;
  113.  
  114.    if (instr->dest.is_ssa) {
  115.       nir_ssa_dest_init(&new_instr->instr, &new_instr->dest,
  116.                         instr->dest.ssa.num_components, NULL);
  117.       nir_ssa_def_rewrite_uses(&instr->dest.ssa,
  118.                                nir_src_for_ssa(&new_instr->dest.ssa),
  119.                                mem_ctx);
  120.    } else {
  121.       nir_dest_copy(&new_instr->dest, &instr->dest, mem_ctx);
  122.    }
  123.  
  124.    nir_instr_insert_before(&instr->instr, &new_instr->instr);
  125.    nir_instr_remove(&instr->instr);
  126. }
  127.  
  128. static bool
  129. lower_block(nir_block *block, void *state)
  130. {
  131.    nir_foreach_instr_safe(block, instr) {
  132.       if (instr->type == nir_instr_type_intrinsic)
  133.          lower_instr(nir_instr_as_intrinsic(instr), state);
  134.    }
  135.  
  136.    return true;
  137. }
  138.  
  139. void
  140. nir_lower_atomics(nir_shader *shader)
  141. {
  142.    nir_foreach_overload(shader, overload) {
  143.       if (overload->impl) {
  144.          nir_foreach_block(overload->impl, lower_block, overload->impl);
  145.          nir_metadata_preserve(overload->impl, nir_metadata_block_index |
  146.                                                nir_metadata_dominance);
  147.       }
  148.    }
  149. }
  150.