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  1. /*
  2.  * Copyright © 2010 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.  *    Eric Anholt <eric@anholt.net>
  25.  *
  26.  */
  27.  
  28. struct ra_class;
  29. struct ra_regs;
  30.  
  31. /* @{
  32.  * Register set setup.
  33.  *
  34.  * This should be done once at backend initializaion, as
  35.  * ra_set_finalize is O(r^2*c^2).  The registers may be virtual
  36.  * registers, such as aligned register pairs that conflict with the
  37.  * two real registers from which they are composed.
  38.  */
  39. struct ra_regs *ra_alloc_reg_set(unsigned int count);
  40. unsigned int ra_alloc_reg_class(struct ra_regs *regs);
  41. void ra_add_reg_conflict(struct ra_regs *regs,
  42.                          unsigned int r1, unsigned int r2);
  43. void ra_class_add_reg(struct ra_regs *regs, unsigned int c, unsigned int reg);
  44. void ra_set_finalize(struct ra_regs *regs);
  45. /** @} */
  46.  
  47. /** @{ Interference graph setup.
  48.  *
  49.  * Each interference graph node is a virtual variable in the IL.  It
  50.  * is up to the user to ra_set_node_class() for the virtual variable,
  51.  * and compute live ranges and ra_node_interfere() between conflicting
  52.  * live ranges.
  53.  */
  54. struct ra_graph *ra_alloc_interference_graph(struct ra_regs *regs,
  55.                                              unsigned int count);
  56. void ra_set_node_class(struct ra_graph *g, unsigned int n, unsigned int c);
  57. void ra_add_node_interference(struct ra_graph *g,
  58.                               unsigned int n1, unsigned int n2);
  59. /** @} */
  60.  
  61. /** @{ Graph-coloring register allocation */
  62. GLboolean ra_simplify(struct ra_graph *g);
  63. void ra_optimistic_color(struct ra_graph *g);
  64. GLboolean ra_select(struct ra_graph *g);
  65. GLboolean ra_allocate_no_spills(struct ra_graph *g);
  66.  
  67. unsigned int ra_get_node_reg(struct ra_graph *g, unsigned int n);
  68. void ra_set_node_spill_cost(struct ra_graph *g, unsigned int n, float cost);
  69. int ra_get_best_spill_node(struct ra_graph *g);
  70. /** @} */
  71.  
  72.