gcc/ipa-inline.h

   1 /* Inlining decision heuristics.
   2    Copyright (C) 2003-2020 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 class edge_growth_cache_entry
  27 {
  28 public:
  29   sreal time, nonspec_time;
  30   int size;
  31   ipa_hints hints;
  32
  33   edge_growth_cache_entry()
  34     : size (0), hints (0) {}
  35
  36   edge_growth_cache_entry(int64_t time, int64_t nonspec_time,
  37                           int size, ipa_hints hints)
  38     : time (time), nonspec_time (nonspec_time), size (size),
  39       hints (hints) {}
  40 };
  41
  42 extern fast_call_summary<edge_growth_cache_entry *, va_heap> *edge_growth_cache;
  43
  44 /* In ipa-inline-analysis.c  */
  45 int estimate_size_after_inlining (struct cgraph_node *, struct cgraph_edge *);
  46 int estimate_growth (struct cgraph_node *);
  47 bool growth_positive_p (struct cgraph_node *, struct cgraph_edge *, int);
  48 int do_estimate_edge_size (struct cgraph_edge *edge);
  49 sreal do_estimate_edge_time (struct cgraph_edge *edge, sreal *nonspec_time = NULL);
  50 ipa_hints do_estimate_edge_hints (struct cgraph_edge *edge);
  51 void reset_node_cache (struct cgraph_node *node);
  52 void initialize_growth_caches ();
  53 void free_growth_caches (void);
  54
  55 /* In ipa-inline.c  */
  56 unsigned int early_inliner (function *fun);
  57 bool inline_account_function_p (struct cgraph_node *node);
  58
  59
  60 /* In ipa-inline-transform.c  */
  61 bool inline_call (struct cgraph_edge *, bool, vec<cgraph_edge *> *, int *, bool,
  62                   bool *callee_removed = NULL);
  63 unsigned int inline_transform (struct cgraph_node *);
  64 void clone_inlined_nodes (struct cgraph_edge *e, bool, bool, int *);
  65
  66 extern int ncalls_inlined;
  67 extern int nfunctions_inlined;
  68 extern function_summary <tree *> *ipa_saved_clone_sources;
  69
  70 /* Return estimated size of the inline sequence of EDGE.  */
  71
  72 static inline int
  73 estimate_edge_size (struct cgraph_edge *edge)
  74 {
  75   edge_growth_cache_entry *entry;
  76   if (edge_growth_cache == NULL
  77       || (entry = edge_growth_cache->get (edge)) == NULL
  78       || entry->size == 0)
  79     return do_estimate_edge_size (edge);
  80   return entry->size - (entry->size > 0);
  81 }
  82
  83 /* Return lower bound on estimated callee growth after inlining EDGE.  */
  84
  85 static inline int
  86 estimate_min_edge_growth (struct cgraph_edge *edge)
  87 {
  88   ipa_call_summary *s = ipa_call_summaries->get (edge);
  89   struct cgraph_node *callee = edge->callee->ultimate_alias_target ();
  90   return (ipa_fn_summaries->get (callee)->min_size - s->call_stmt_size);
  91 }
  92
  93 /* Return estimated callee growth after inlining EDGE.  */
  94
  95 static inline int
  96 estimate_edge_growth (struct cgraph_edge *edge)
  97 {
  98   ipa_call_summary *s = ipa_call_summaries->get (edge);
  99   gcc_checking_assert (s->call_stmt_size || !edge->callee->analyzed);
 100   return (estimate_edge_size (edge) - s->call_stmt_size);
 101 }
 102
 103 /* Return estimated callee runtime increase after inlining
 104    EDGE.  */
 105
 106 static inline sreal
 107 estimate_edge_time (struct cgraph_edge *edge, sreal *nonspec_time = NULL)
 108 {
 109   edge_growth_cache_entry *entry;
 110   if (edge_growth_cache == NULL
 111       || (entry = edge_growth_cache->get (edge)) == NULL
 112       || entry->time == 0)
 113     return do_estimate_edge_time (edge, nonspec_time);
 114   if (nonspec_time)
 115     *nonspec_time = edge_growth_cache->get (edge)->nonspec_time;
 116   return entry->time;
 117 }
 118
 119
 120 /* Return estimated callee runtime increase after inlining
 121    EDGE.  */
 122
 123 static inline ipa_hints
 124 estimate_edge_hints (struct cgraph_edge *edge)
 125 {
 126   edge_growth_cache_entry *entry;
 127   if (edge_growth_cache == NULL
 128       || (entry = edge_growth_cache->get (edge)) == NULL
 129       || entry->hints == 0)
 130     return do_estimate_edge_hints (edge);
 131   return entry->hints - 1;
 132 }
 133
 134 #endif /* GCC_IPA_INLINE_H */