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toolchain-gcc-arm-embedded/lib/gcc/arm-none-eabi/10.2.1/plugin/include/tree-scalar-evolution.h

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  1. /* Scalar evolution detector.

  2.    Copyright (C) 2003-2020 Free Software Foundation, Inc.

  3.    Contributed by Sebastian Pop <s.pop@laposte.net>

  4. 

  5. This file is part of GCC.

  6. 

  7. GCC is free software; you can redistribute it and/or modify it under

  8. the terms of the GNU General Public License as published by the Free

  9. Software Foundation; either version 3, or (at your option) any later

  10. version.

  11. 

  12. GCC is distributed in the hope that it will be useful, but WITHOUT ANY

  13. WARRANTY; without even the implied warranty of MERCHANTABILITY or

  14. FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  15. for more details.

  16. 

  17. You should have received a copy of the GNU General Public License

  18. along with GCC; see the file COPYING3.  If not see

  19. <http://www.gnu.org/licenses/>.  */

  20. 

  21. #ifndef GCC_TREE_SCALAR_EVOLUTION_H

  22. #define GCC_TREE_SCALAR_EVOLUTION_H

  23. 

  24. extern tree number_of_latch_executions (class loop *);

  25. extern gcond *get_loop_exit_condition (const class loop *);

  26. 

  27. extern void scev_initialize (void);

  28. extern bool scev_initialized_p (void);

  29. extern void scev_reset (void);

  30. extern void scev_reset_htab (void);

  31. extern void scev_finalize (void);

  32. extern tree analyze_scalar_evolution (class loop *, tree);

  33. extern tree instantiate_scev (edge, class loop *, tree);

  34. extern tree resolve_mixers (class loop *, tree, bool *);

  35. extern void gather_stats_on_scev_database (void);

  36. extern bool final_value_replacement_loop (class loop *);

  37. extern unsigned int scev_const_prop (void);

  38. extern bool expression_expensive_p (tree);

  39. extern bool simple_iv_with_niters (class loop *, class loop *, tree,

  40. 				   struct affine_iv *, tree *, bool);

  41. extern bool simple_iv (class loop *, class loop *, tree, struct affine_iv *,

  42. 		       bool);

  43. extern bool iv_can_overflow_p (class loop *, tree, tree, tree);

  44. extern tree compute_overall_effect_of_inner_loop (class loop *, tree);

  45. 

  46. /* Returns the basic block preceding LOOP, or the CFG entry block when

  47.    the loop is function's body.  */

  48. 

  49. static inline basic_block

  50. block_before_loop (loop_p loop)

  51. {

  52.   edge preheader = loop_preheader_edge (loop);

  53.   return (preheader ? preheader->src : ENTRY_BLOCK_PTR_FOR_FN (cfun));

  54. }

  55. 

  56. /* Analyze all the parameters of the chrec that were left under a

  57.    symbolic form.  LOOP is the loop in which symbolic names have to

  58.    be analyzed and instantiated.  */

  59. 

  60. static inline tree

  61. instantiate_parameters (class loop *loop, tree chrec)

  62. {

  63.   return instantiate_scev (loop_preheader_edge (loop), loop, chrec);

  64. }

  65. 

  66. /* Returns the loop of the polynomial chrec CHREC.  */

  67. 

  68. static inline class loop *

  69. get_chrec_loop (const_tree chrec)

  70. {

  71.   return get_loop (cfun, CHREC_VARIABLE (chrec));

  72. }

  73. 

  74. #endif  /* GCC_TREE_SCALAR_EVOLUTION_H  */