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/* Inlining decision heuristics.
Copyright (C) 2003, 2004, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
Contributed by Jan Hubicka
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
/* Function inlining information. */
struct inline_summary
{
/* Information about the function body itself. */
/* Estimated stack frame consumption by the function. */
HOST_WIDE_INT estimated_self_stack_size;
/* Size of the function body. */
int self_size;
/* How many instructions are likely going to disappear after inlining. */
int size_inlining_benefit;
/* Estimated time spent executing the function body. */
int self_time;
/* How much time is going to be saved by inlining. */
int time_inlining_benefit;
/* False when there something makes inlining impossible (such as va_arg). */
unsigned inlinable : 1;
/* False when there something makes versioning impossible.
Currently computed and used only by ipa-cp. */
unsigned versionable : 1;
/* Information about function that will result after applying all the
inline decisions present in the callgraph. Generally kept up to
date only for functions that are not inline clones. */
/* Estimated stack frame consumption by the function. */
HOST_WIDE_INT estimated_stack_size;
/* Expected offset of the stack frame of inlined function. */
HOST_WIDE_INT stack_frame_offset;
/* Estimated size of the function after inlining. */
int time;
int size;
/* Cached estimated growth after inlining.
INT_MIN if not computed. */
int estimated_growth;
};
typedef struct inline_summary inline_summary_t;
DEF_VEC_O(inline_summary_t);
DEF_VEC_ALLOC_O(inline_summary_t,heap);
extern VEC(inline_summary_t,heap) *inline_summary_vec;
void debug_inline_summary (struct cgraph_node *);
void dump_inline_summaries (FILE *f);
void inline_generate_summary (void);
void inline_read_summary (void);
void inline_write_summary (cgraph_node_set, varpool_node_set);
void inline_free_summary (void);
void initialize_inline_failed (struct cgraph_edge *);
int estimate_time_after_inlining (struct cgraph_node *, struct cgraph_edge *);
int estimate_size_after_inlining (struct cgraph_node *, struct cgraph_edge *);
int estimate_growth (struct cgraph_node *);
static inline struct inline_summary *
inline_summary (struct cgraph_node *node)
{
return VEC_index (inline_summary_t, inline_summary_vec, node->uid);
}
/* Estimate the growth of the caller when inlining EDGE. */
static inline int
estimate_edge_growth (struct cgraph_edge *edge)
{
int call_stmt_size;
struct inline_summary *info = inline_summary (edge->callee);
call_stmt_size = edge->call_stmt_size;
gcc_checking_assert (call_stmt_size);
return (info->size
- info->size_inlining_benefit
- call_stmt_size);
}
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