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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.  
  30. static bool
  31. global_to_local(nir_register *reg)
  32. {
  33.    nir_function_impl *impl = NULL;
  34.  
  35.    assert(reg->is_global);
  36.  
  37.    nir_foreach_def(reg, def_dest) {
  38.       nir_instr *instr = def_dest->reg.parent_instr;
  39.       nir_function_impl *instr_impl =
  40.          nir_cf_node_get_function(&instr->block->cf_node);
  41.       if (impl != NULL) {
  42.          if (impl != instr_impl)
  43.             return false;
  44.       } else {
  45.          impl = instr_impl;
  46.       }
  47.    }
  48.  
  49.    nir_foreach_use(reg, use_src) {
  50.       nir_instr *instr = use_src->parent_instr;
  51.       nir_function_impl *instr_impl =
  52.          nir_cf_node_get_function(&instr->block->cf_node);
  53.       if (impl != NULL) {
  54.          if (impl != instr_impl)
  55.             return false;
  56.       } else {
  57.          impl = instr_impl;
  58.       }
  59.    }
  60.  
  61.    nir_foreach_if_use(reg, use_src) {
  62.       nir_if *if_stmt = use_src->parent_if;
  63.       nir_function_impl *if_impl = nir_cf_node_get_function(&if_stmt->cf_node);
  64.       if (impl != NULL) {
  65.          if (impl != if_impl)
  66.             return false;
  67.       } else {
  68.          impl = if_impl;
  69.       }
  70.    }
  71.  
  72.    if (impl == NULL) {
  73.       /* this instruction is never used/defined, delete it */
  74.       nir_reg_remove(reg);
  75.       return true;
  76.    }
  77.  
  78.    /*
  79.     * if we've gotten to this point, the register is always used/defined in
  80.     * the same implementation so we can move it to be local to that
  81.     * implementation.
  82.     */
  83.  
  84.    exec_node_remove(&reg->node);
  85.    exec_list_push_tail(&impl->registers, &reg->node);
  86.    reg->index = impl->reg_alloc++;
  87.    reg->is_global = false;
  88.    return true;
  89. }
  90.  
  91. bool
  92. nir_opt_global_to_local(nir_shader *shader)
  93. {
  94.    bool progress = false;
  95.  
  96.    foreach_list_typed_safe(nir_register, reg, node, &shader->registers) {
  97.       if (global_to_local(reg))
  98.          progress = true;
  99.    }
  100.  
  101.    return progress;
  102. }
  103.