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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:

 *    Connor Abbott (cwabbott0@gmail.com)

 *

 */

#include "nir.h"

#include "main/config.h"

#include 

/*

 * replace atomic counter intrinsics that use a variable with intrinsics

 * that directly store the buffer index and byte offset

 */

static void

lower_instr(nir_intrinsic_instr *instr, nir_function_impl *impl)

{

   nir_intrinsic_op op;

   switch (instr->intrinsic) {

   case nir_intrinsic_atomic_counter_read_var:

      op = nir_intrinsic_atomic_counter_read;

      break;

   case nir_intrinsic_atomic_counter_inc_var:

      op = nir_intrinsic_atomic_counter_inc;

      break;

   case nir_intrinsic_atomic_counter_dec_var:

      op = nir_intrinsic_atomic_counter_dec;

      break;

   default:

      return;

   }

   if (instr->variables[0]->var->data.mode != nir_var_uniform)

      return; /* atomics passed as function arguments can't be lowered */

   void *mem_ctx = ralloc_parent(instr);

   nir_intrinsic_instr *new_instr = nir_intrinsic_instr_create(mem_ctx, op);

   new_instr->const_index[0] =

      (int) instr->variables[0]->var->data.atomic.buffer_index;

   nir_load_const_instr *offset_const = nir_load_const_instr_create(mem_ctx, 1);

   offset_const->value.u[0] = instr->variables[0]->var->data.atomic.offset;

   nir_instr_insert_before(&instr->instr, &offset_const->instr);

   nir_ssa_def *offset_def = &offset_const->def;

   if (instr->variables[0]->deref.child != NULL) {

      assert(instr->variables[0]->deref.child->deref_type ==

             nir_deref_type_array);

      nir_deref_array *deref_array =

         nir_deref_as_array(instr->variables[0]->deref.child);

      assert(deref_array->deref.child == NULL);

      offset_const->value.u[0] +=

         deref_array->base_offset * ATOMIC_COUNTER_SIZE;

      if (deref_array->deref_array_type == nir_deref_array_type_indirect) {

         nir_load_const_instr *atomic_counter_size =

               nir_load_const_instr_create(mem_ctx, 1);

         atomic_counter_size->value.u[0] = ATOMIC_COUNTER_SIZE;

         nir_instr_insert_before(&instr->instr, &atomic_counter_size->instr);

         nir_alu_instr *mul = nir_alu_instr_create(mem_ctx, nir_op_imul);

         nir_ssa_dest_init(&mul->instr, &mul->dest.dest, 1, NULL);

         mul->dest.write_mask = 0x1;

         nir_src_copy(&mul->src[0].src, &deref_array->indirect, mem_ctx);

         mul->src[1].src.is_ssa = true;

         mul->src[1].src.ssa = &atomic_counter_size->def;

         nir_instr_insert_before(&instr->instr, &mul->instr);

         nir_alu_instr *add = nir_alu_instr_create(mem_ctx, nir_op_iadd);

         nir_ssa_dest_init(&add->instr, &add->dest.dest, 1, NULL);

         add->dest.write_mask = 0x1;

         add->src[0].src.is_ssa = true;

         add->src[0].src.ssa = &mul->dest.dest.ssa;

         add->src[1].src.is_ssa = true;

         add->src[1].src.ssa = &offset_const->def;

         nir_instr_insert_before(&instr->instr, &add->instr);

         offset_def = &add->dest.dest.ssa;

      }

   }

   new_instr->src[0].is_ssa = true;

   new_instr->src[0].ssa = offset_def;;

   if (instr->dest.is_ssa) {

      nir_ssa_dest_init(&new_instr->instr, &new_instr->dest,

                        instr->dest.ssa.num_components, NULL);

      nir_ssa_def_rewrite_uses(&instr->dest.ssa,

                               nir_src_for_ssa(&new_instr->dest.ssa),

                               mem_ctx);

   } else {

      nir_dest_copy(&new_instr->dest, &instr->dest, mem_ctx);

   }

   nir_instr_insert_before(&instr->instr, &new_instr->instr);

   nir_instr_remove(&instr->instr);

}

static bool

lower_block(nir_block *block, void *state)

{

   nir_foreach_instr_safe(block, instr) {

      if (instr->type == nir_instr_type_intrinsic)

         lower_instr(nir_instr_as_intrinsic(instr), state);

   }

   return true;

}

void

nir_lower_atomics(nir_shader *shader)

{

   nir_foreach_overload(shader, overload) {

      if (overload->impl) {

         nir_foreach_block(overload->impl, lower_block, overload->impl);

         nir_metadata_preserve(overload->impl, nir_metadata_block_index |

                                               nir_metadata_dominance);

      }

   }

}