gcc/ipa-inline.h

   1 /* Inlining decision heuristics.
   2    Copyright (C) 2003-2018 Free Software Foundation, Inc.
   3    Contributed by Jan Hubicka
   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_IPA_INLINE_H
  22 #define GCC_IPA_INLINE_H
  23
  24 /* Data we cache about callgraph edges during inlining to avoid expensive
  25    re-computations during the greedy algorithm.  */
  26 struct edge_growth_cache_entry
  27 {
  28   sreal time, nonspec_time;
  29   int size;
  30   ipa_hints hints;
  31
  32   edge_growth_cache_entry()
  33     : size (0), hints (0) {}
  34
  35   edge_growth_cache_entry(int64_t time, int64_t nonspec_time,
  36                           int size, ipa_hints hints)
  37     : time (time), nonspec_time (nonspec_time), size (size),
  38       hints (hints) {}
  39 };
  40
  41 extern call_summary<edge_growth_cache_entry *> *edge_growth_cache;
  42
  43 /* In ipa-inline-analysis.c  */
  44 int estimate_size_after_inlining (struct cgraph_node *, struct cgraph_edge *);
  45 int estimate_growth (struct cgraph_node *);
  46 bool growth_likely_positive (struct cgraph_node *, int);
  47 int do_estimate_edge_size (struct cgraph_edge *edge);
  48 sreal do_estimate_edge_time (struct cgraph_edge *edge);
  49 ipa_hints do_estimate_edge_hints (struct cgraph_edge *edge);
  50 void free_growth_caches (void);
  51
  52 /* In ipa-inline.c  */
  53 unsigned int early_inliner (function *fun);
  54 bool inline_account_function_p (struct cgraph_node *node);
  55
  56
  57 /* In ipa-inline-transform.c  */
  58 bool inline_call (struct cgraph_edge *, bool, vec<cgraph_edge *> *, int *, bool,
  59                   bool *callee_removed = NULL);
  60 unsigned int inline_transform (struct cgraph_node *);
  61 void clone_inlined_nodes (struct cgraph_edge *e, bool, bool, int *);
  62
  63 extern int ncalls_inlined;
  64 extern int nfunctions_inlined;
  65
  66 /* Return estimated size of the inline sequence of EDGE.  */
  67
  68 static inline int
  69 estimate_edge_size (struct cgraph_edge *edge)
  70 {
  71   edge_growth_cache_entry *entry;
  72   if (edge_growth_cache == NULL
  73       || (entry = edge_growth_cache->get (edge)) == NULL
  74       || entry->size == 0)
  75     return do_estimate_edge_size (edge);
  76   return entry->size - (entry->size > 0);
  77 }
  78
  79 /* Return estimated callee growth after inlining EDGE.  */
  80
  81 static inline int
  82 estimate_edge_growth (struct cgraph_edge *edge)
  83 {
  84   ipa_call_summary *s = ipa_call_summaries->get_create (edge);
  85   gcc_checking_assert (s->call_stmt_size || !edge->callee->analyzed);
  86   return (estimate_edge_size (edge) - s->call_stmt_size);
  87 }
  88
  89 /* Return estimated callee runtime increase after inlining
  90    EDGE.  */
  91
  92 static inline sreal
  93 estimate_edge_time (struct cgraph_edge *edge, sreal *nonspec_time = NULL)
  94 {
  95   edge_growth_cache_entry *entry;
  96   if (edge_growth_cache == NULL
  97       || (entry = edge_growth_cache->get (edge)) == NULL
  98       || entry->time == 0)
  99     return do_estimate_edge_time (edge);
 100   if (nonspec_time)
 101     *nonspec_time = edge_growth_cache->get (edge)->nonspec_time;
 102   return entry->time;
 103 }
 104
 105
 106 /* Return estimated callee runtime increase after inlining
 107    EDGE.  */
 108
 109 static inline ipa_hints
 110 estimate_edge_hints (struct cgraph_edge *edge)
 111 {
 112   edge_growth_cache_entry *entry;
 113   if (edge_growth_cache == NULL
 114       || (entry = edge_growth_cache->get (edge)) == NULL
 115       || entry->hints == 0)
 116     return do_estimate_edge_hints (edge);
 117   return entry->hints - 1;
 118 }
 119
 120 #endif /* GCC_IPA_INLINE_H */