src/glsl/nir/nir_gather_info.c

   1 /*
   2  * Copyright © 2015 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
  24 #include "nir.h"
  25
  26 static void
  27 gather_intrinsic_info(nir_intrinsic_instr *instr, nir_shader *shader)
  28 {
  29    switch (instr->intrinsic) {
  30    case nir_intrinsic_discard:
  31       assert(shader->stage == MESA_SHADER_FRAGMENT);
  32       shader->info.fs.uses_discard = true;
  33       break;
  34
  35    case nir_intrinsic_load_front_face:
  36    case nir_intrinsic_load_vertex_id:
  37    case nir_intrinsic_load_vertex_id_zero_base:
  38    case nir_intrinsic_load_base_vertex:
  39    case nir_intrinsic_load_instance_id:
  40    case nir_intrinsic_load_sample_id:
  41    case nir_intrinsic_load_sample_pos:
  42    case nir_intrinsic_load_sample_mask_in:
  43    case nir_intrinsic_load_primitive_id:
  44    case nir_intrinsic_load_invocation_id:
  45    case nir_intrinsic_load_local_invocation_id:
  46    case nir_intrinsic_load_work_group_id:
  47    case nir_intrinsic_load_num_work_groups:
  48       shader->info.system_values_read |=
  49          (1 << nir_system_value_from_intrinsic(instr->intrinsic));
  50       break;
  51    default:
  52       break;
  53    }
  54 }
  55
  56 static void
  57 gather_tex_info(nir_tex_instr *instr, nir_shader *shader)
  58 {
  59    if (instr->op == nir_texop_tg4)
  60       shader->info.uses_texture_gather = true;
  61 }
  62
  63 static bool
  64 gather_info_block(nir_block *block, void *shader)
  65 {
  66    nir_foreach_instr(block, instr) {
  67       switch (instr->type) {
  68       case nir_instr_type_intrinsic:
  69          gather_intrinsic_info(nir_instr_as_intrinsic(instr), shader);
  70          break;
  71       case nir_instr_type_tex:
  72          gather_tex_info(nir_instr_as_tex(instr), shader);
  73          break;
  74       case nir_instr_type_call:
  75          assert(!"nir_shader_gather_info only works if functions are inlined");
  76          break;
  77       default:
  78          break;
  79       }
  80    }
  81
  82    return true;
  83 }
  84
  85 void
  86 nir_shader_gather_info(nir_shader *shader, nir_function_impl *entrypoint)
  87 {
  88    shader->info.inputs_read = 0;
  89    foreach_list_typed(nir_variable, var, node, &shader->inputs)
  90       shader->info.inputs_read |= (1ull << var->data.location);
  91
  92    shader->info.outputs_written = 0;
  93    foreach_list_typed(nir_variable, var, node, &shader->outputs)
  94       shader->info.outputs_written |= (1ull << var->data.location);
  95
  96    shader->info.system_values_read = 0;
  97    foreach_list_typed(nir_variable, var, node, &shader->system_values)
  98       shader->info.system_values_read |= (1ull << var->data.location);
  99
 100    nir_foreach_block(entrypoint, gather_info_block, shader);
 101 }