741 lines
22 KiB
C
741 lines
22 KiB
C
/* Inlining decision heuristics.
|
|
Copyright (C) 2003, 2004 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 2, 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 COPYING. If not, write to the Free
|
|
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
|
|
02111-1307, USA. */
|
|
|
|
/* Inlining decision heuristics
|
|
|
|
We separate inlining decisions from the inliner itself and store it
|
|
inside callgraph as so called inline plan. Refer to cgraph.c
|
|
documentation about particular representation of inline plans in the
|
|
callgraph.
|
|
|
|
There are three major parts of this file:
|
|
|
|
cgraph_mark_inline implementation
|
|
|
|
This function allow to mark given call inline and performs neccesary
|
|
modifications of cgraph (production of the clones and updating overall
|
|
statistics)
|
|
|
|
inlining heuristics limits
|
|
|
|
These functions allow to check that particular inlining is allowed
|
|
by the limits specified by user (allowed function growth, overall unit
|
|
growth and so on).
|
|
|
|
inlining heuristics
|
|
|
|
This is implementation of IPA pass aiming to get as much of benefit
|
|
from inlining obeying the limits checked above.
|
|
|
|
The implementation of particular heuristics is separated from
|
|
the rest of code to make it easier to replace it with more complicated
|
|
implementation in the future. The rest of inlining code acts as a
|
|
library aimed to modify the callgraph and verify that the parameters
|
|
on code size growth fits.
|
|
|
|
To mark given call inline, use cgraph_mark_inline function, the
|
|
verification is performed by cgraph_default_inline_p and
|
|
cgraph_check_inline_limits.
|
|
|
|
The heuristics implements simple knapsack style algorithm ordering
|
|
all functions by their "profitability" (estimated by code size growth)
|
|
and inlining them in priority order.
|
|
|
|
cgraph_decide_inlining implements heuristics taking whole callgraph
|
|
into account, while cgraph_decide_inlining_incrementally considers
|
|
only one function at a time and is used in non-unit-at-a-time mode. */
|
|
|
|
#include "config.h"
|
|
#include "system.h"
|
|
#include "coretypes.h"
|
|
#include "tm.h"
|
|
#include "tree.h"
|
|
#include "tree-inline.h"
|
|
#include "langhooks.h"
|
|
#include "flags.h"
|
|
#include "cgraph.h"
|
|
#include "diagnostic.h"
|
|
#include "timevar.h"
|
|
#include "params.h"
|
|
#include "fibheap.h"
|
|
#include "intl.h"
|
|
#include "tree-pass.h"
|
|
|
|
/* Statistics we collect about inlining algorithm. */
|
|
static int ncalls_inlined;
|
|
static int nfunctions_inlined;
|
|
static int initial_insns;
|
|
static int overall_insns;
|
|
|
|
/* Estimate size of the function after inlining WHAT into TO. */
|
|
|
|
static int
|
|
cgraph_estimate_size_after_inlining (int times, struct cgraph_node *to,
|
|
struct cgraph_node *what)
|
|
{
|
|
tree fndecl = what->decl;
|
|
tree arg;
|
|
int call_insns = PARAM_VALUE (PARAM_INLINE_CALL_COST);
|
|
for (arg = DECL_ARGUMENTS (fndecl); arg; arg = TREE_CHAIN (arg))
|
|
call_insns += estimate_move_cost (TREE_TYPE (arg));
|
|
return (what->global.insns - call_insns) * times + to->global.insns;
|
|
}
|
|
|
|
/* E is expected to be an edge being inlined. Clone destination node of
|
|
the edge and redirect it to the new clone.
|
|
DUPLICATE is used for bookkeeping on whether we are actually creating new
|
|
clones or re-using node originally representing out-of-line function call.
|
|
*/
|
|
void
|
|
cgraph_clone_inlined_nodes (struct cgraph_edge *e, bool duplicate)
|
|
{
|
|
struct cgraph_node *n;
|
|
|
|
/* We may eliminate the need for out-of-line copy to be output. In that
|
|
case just go ahead and re-use it. */
|
|
if (!e->callee->callers->next_caller
|
|
&& (!e->callee->needed || DECL_EXTERNAL (e->callee->decl))
|
|
&& duplicate
|
|
&& flag_unit_at_a_time)
|
|
{
|
|
gcc_assert (!e->callee->global.inlined_to);
|
|
if (!DECL_EXTERNAL (e->callee->decl))
|
|
overall_insns -= e->callee->global.insns, nfunctions_inlined++;
|
|
duplicate = 0;
|
|
}
|
|
else if (duplicate)
|
|
{
|
|
n = cgraph_clone_node (e->callee);
|
|
cgraph_redirect_edge_callee (e, n);
|
|
}
|
|
|
|
if (e->caller->global.inlined_to)
|
|
e->callee->global.inlined_to = e->caller->global.inlined_to;
|
|
else
|
|
e->callee->global.inlined_to = e->caller;
|
|
|
|
/* Recursively clone all bodies. */
|
|
for (e = e->callee->callees; e; e = e->next_callee)
|
|
if (!e->inline_failed)
|
|
cgraph_clone_inlined_nodes (e, duplicate);
|
|
}
|
|
|
|
/* Mark edge E as inlined and update callgraph accordingly. */
|
|
|
|
void
|
|
cgraph_mark_inline_edge (struct cgraph_edge *e)
|
|
{
|
|
int old_insns = 0, new_insns = 0;
|
|
struct cgraph_node *to = NULL, *what;
|
|
|
|
gcc_assert (e->inline_failed);
|
|
e->inline_failed = NULL;
|
|
|
|
if (!e->callee->global.inlined && flag_unit_at_a_time)
|
|
DECL_POSSIBLY_INLINED (e->callee->decl) = true;
|
|
e->callee->global.inlined = true;
|
|
|
|
cgraph_clone_inlined_nodes (e, true);
|
|
|
|
what = e->callee;
|
|
|
|
/* Now update size of caller and all functions caller is inlined into. */
|
|
for (;e && !e->inline_failed; e = e->caller->callers)
|
|
{
|
|
old_insns = e->caller->global.insns;
|
|
new_insns = cgraph_estimate_size_after_inlining (1, e->caller,
|
|
what);
|
|
gcc_assert (new_insns >= 0);
|
|
to = e->caller;
|
|
to->global.insns = new_insns;
|
|
}
|
|
gcc_assert (what->global.inlined_to == to);
|
|
if (new_insns > old_insns)
|
|
overall_insns += new_insns - old_insns;
|
|
ncalls_inlined++;
|
|
}
|
|
|
|
/* Mark all calls of EDGE->CALLEE inlined into EDGE->CALLER.
|
|
Return following unredirected edge in the list of callers
|
|
of EDGE->CALLEE */
|
|
|
|
static struct cgraph_edge *
|
|
cgraph_mark_inline (struct cgraph_edge *edge)
|
|
{
|
|
struct cgraph_node *to = edge->caller;
|
|
struct cgraph_node *what = edge->callee;
|
|
struct cgraph_edge *e, *next;
|
|
int times = 0;
|
|
|
|
/* Look for all calls, mark them inline and clone recursively
|
|
all inlined functions. */
|
|
for (e = what->callers; e; e = next)
|
|
{
|
|
next = e->next_caller;
|
|
if (e->caller == to && e->inline_failed)
|
|
{
|
|
cgraph_mark_inline_edge (e);
|
|
if (e == edge)
|
|
edge = next;
|
|
times++;
|
|
}
|
|
}
|
|
gcc_assert (times);
|
|
return edge;
|
|
}
|
|
|
|
/* Estimate the growth caused by inlining NODE into all callees. */
|
|
|
|
static int
|
|
cgraph_estimate_growth (struct cgraph_node *node)
|
|
{
|
|
int growth = 0;
|
|
struct cgraph_edge *e;
|
|
|
|
for (e = node->callers; e; e = e->next_caller)
|
|
if (e->inline_failed)
|
|
growth += (cgraph_estimate_size_after_inlining (1, e->caller, node)
|
|
- e->caller->global.insns);
|
|
|
|
/* ??? Wrong for self recursive functions or cases where we decide to not
|
|
inline for different reasons, but it is not big deal as in that case
|
|
we will keep the body around, but we will also avoid some inlining. */
|
|
if (!node->needed && !DECL_EXTERNAL (node->decl))
|
|
growth -= node->global.insns;
|
|
|
|
return growth;
|
|
}
|
|
|
|
/* Return false when inlining WHAT into TO is not good idea
|
|
as it would cause too large growth of function bodies. */
|
|
|
|
static bool
|
|
cgraph_check_inline_limits (struct cgraph_node *to, struct cgraph_node *what,
|
|
const char **reason)
|
|
{
|
|
int times = 0;
|
|
struct cgraph_edge *e;
|
|
int newsize;
|
|
int limit;
|
|
|
|
if (to->global.inlined_to)
|
|
to = to->global.inlined_to;
|
|
|
|
for (e = to->callees; e; e = e->next_callee)
|
|
if (e->callee == what)
|
|
times++;
|
|
|
|
/* When inlining large function body called once into small function,
|
|
take the inlined function as base for limiting the growth. */
|
|
if (to->local.self_insns > what->local.self_insns)
|
|
limit = to->local.self_insns;
|
|
else
|
|
limit = what->local.self_insns;
|
|
|
|
limit += limit * PARAM_VALUE (PARAM_LARGE_FUNCTION_GROWTH) / 100;
|
|
|
|
newsize = cgraph_estimate_size_after_inlining (times, to, what);
|
|
if (newsize > PARAM_VALUE (PARAM_LARGE_FUNCTION_INSNS)
|
|
&& newsize > limit)
|
|
{
|
|
if (reason)
|
|
*reason = N_("--param large-function-growth limit reached");
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/* Return true when function N is small enough to be inlined. */
|
|
|
|
bool
|
|
cgraph_default_inline_p (struct cgraph_node *n)
|
|
{
|
|
if (!DECL_INLINE (n->decl) || !DECL_SAVED_TREE (n->decl))
|
|
return false;
|
|
if (DECL_DECLARED_INLINE_P (n->decl))
|
|
return n->global.insns < MAX_INLINE_INSNS_SINGLE;
|
|
else
|
|
return n->global.insns < MAX_INLINE_INSNS_AUTO;
|
|
}
|
|
|
|
/* Return true when inlining WHAT would create recursive inlining.
|
|
We call recursive inlining all cases where same function appears more than
|
|
once in the single recursion nest path in the inline graph. */
|
|
|
|
static bool
|
|
cgraph_recursive_inlining_p (struct cgraph_node *to,
|
|
struct cgraph_node *what,
|
|
const char **reason)
|
|
{
|
|
bool recursive;
|
|
if (to->global.inlined_to)
|
|
recursive = what->decl == to->global.inlined_to->decl;
|
|
else
|
|
recursive = what->decl == to->decl;
|
|
/* Marking recursive function inline has sane semantic and thus we should
|
|
not warn on it. */
|
|
if (recursive && reason)
|
|
*reason = (what->local.disregard_inline_limits
|
|
? N_("recursive inlining") : "");
|
|
return recursive;
|
|
}
|
|
|
|
/* Recompute heap nodes for each of callees. */
|
|
static void
|
|
update_callee_keys (fibheap_t heap, struct fibnode **heap_node,
|
|
struct cgraph_node *node)
|
|
{
|
|
struct cgraph_edge *e;
|
|
|
|
for (e = node->callees; e; e = e->next_callee)
|
|
if (e->inline_failed && heap_node[e->callee->uid])
|
|
fibheap_replace_key (heap, heap_node[e->callee->uid],
|
|
cgraph_estimate_growth (e->callee));
|
|
else if (!e->inline_failed)
|
|
update_callee_keys (heap, heap_node, e->callee);
|
|
}
|
|
|
|
/* Enqueue all recursive calls from NODE into queue linked via aux pointers
|
|
in between FIRST and LAST. WHERE is used for bookkeeping while looking
|
|
int calls inlined within NODE. */
|
|
static void
|
|
lookup_recursive_calls (struct cgraph_node *node, struct cgraph_node *where,
|
|
struct cgraph_edge **first, struct cgraph_edge **last)
|
|
{
|
|
struct cgraph_edge *e;
|
|
for (e = where->callees; e; e = e->next_callee)
|
|
if (e->callee == node)
|
|
{
|
|
if (!*first)
|
|
*first = e;
|
|
else
|
|
(*last)->aux = e;
|
|
*last = e;
|
|
}
|
|
for (e = where->callees; e; e = e->next_callee)
|
|
if (!e->inline_failed)
|
|
lookup_recursive_calls (node, e->callee, first, last);
|
|
}
|
|
|
|
/* Decide on recursive inlining: in the case function has recursive calls,
|
|
inline until body size reaches given argument. */
|
|
static void
|
|
cgraph_decide_recursive_inlining (struct cgraph_node *node)
|
|
{
|
|
int limit = PARAM_VALUE (PARAM_MAX_INLINE_INSNS_RECURSIVE_AUTO);
|
|
int max_depth = PARAM_VALUE (PARAM_MAX_INLINE_RECURSIVE_DEPTH_AUTO);
|
|
struct cgraph_edge *first_call = NULL, *last_call = NULL;
|
|
struct cgraph_edge *last_in_current_depth;
|
|
struct cgraph_edge *e;
|
|
struct cgraph_node *master_clone;
|
|
int depth = 0;
|
|
int n = 0;
|
|
|
|
if (DECL_DECLARED_INLINE_P (node->decl))
|
|
{
|
|
limit = PARAM_VALUE (PARAM_MAX_INLINE_INSNS_RECURSIVE);
|
|
max_depth = PARAM_VALUE (PARAM_MAX_INLINE_RECURSIVE_DEPTH);
|
|
}
|
|
|
|
/* Make sure that function is small enough to be considered for inlining. */
|
|
if (!max_depth
|
|
|| cgraph_estimate_size_after_inlining (1, node, node) >= limit)
|
|
return;
|
|
lookup_recursive_calls (node, node, &first_call, &last_call);
|
|
if (!first_call)
|
|
return;
|
|
|
|
if (dump_file)
|
|
fprintf (dump_file,
|
|
"\nPerforming recursive inlining on %s\n",
|
|
cgraph_node_name (node));
|
|
|
|
/* We need original clone to copy around. */
|
|
master_clone = cgraph_clone_node (node);
|
|
master_clone->needed = true;
|
|
for (e = master_clone->callees; e; e = e->next_callee)
|
|
if (!e->inline_failed)
|
|
cgraph_clone_inlined_nodes (e, true);
|
|
|
|
/* Do the inlining and update list of recursive call during process. */
|
|
last_in_current_depth = last_call;
|
|
while (first_call
|
|
&& cgraph_estimate_size_after_inlining (1, node, master_clone) <= limit)
|
|
{
|
|
struct cgraph_edge *curr = first_call;
|
|
|
|
first_call = first_call->aux;
|
|
curr->aux = NULL;
|
|
|
|
cgraph_redirect_edge_callee (curr, master_clone);
|
|
cgraph_mark_inline_edge (curr);
|
|
lookup_recursive_calls (node, curr->callee, &first_call, &last_call);
|
|
|
|
if (last_in_current_depth
|
|
&& ++depth >= max_depth)
|
|
break;
|
|
n++;
|
|
}
|
|
|
|
/* Cleanup queue pointers. */
|
|
while (first_call)
|
|
{
|
|
struct cgraph_edge *next = first_call->aux;
|
|
first_call->aux = NULL;
|
|
first_call = next;
|
|
}
|
|
if (dump_file)
|
|
fprintf (dump_file,
|
|
"\n Inlined %i times, body grown from %i to %i insns\n", n,
|
|
master_clone->global.insns, node->global.insns);
|
|
|
|
/* Remove master clone we used for inlining. We rely that clones inlined
|
|
into master clone gets queued just before master clone so we don't
|
|
need recursion. */
|
|
for (node = cgraph_nodes; node != master_clone;
|
|
node = node->next)
|
|
if (node->global.inlined_to == master_clone)
|
|
cgraph_remove_node (node);
|
|
cgraph_remove_node (master_clone);
|
|
}
|
|
|
|
/* Set inline_failed for all callers of given function to REASON. */
|
|
|
|
static void
|
|
cgraph_set_inline_failed (struct cgraph_node *node, const char *reason)
|
|
{
|
|
struct cgraph_edge *e;
|
|
|
|
if (dump_file)
|
|
fprintf (dump_file, "Inlining failed: %s\n", reason);
|
|
for (e = node->callers; e; e = e->next_caller)
|
|
if (e->inline_failed)
|
|
e->inline_failed = reason;
|
|
}
|
|
|
|
/* We use greedy algorithm for inlining of small functions:
|
|
All inline candidates are put into prioritized heap based on estimated
|
|
growth of the overall number of instructions and then update the estimates.
|
|
|
|
INLINED and INLINED_CALEES are just pointers to arrays large enough
|
|
to be passed to cgraph_inlined_into and cgraph_inlined_callees. */
|
|
|
|
static void
|
|
cgraph_decide_inlining_of_small_functions (void)
|
|
{
|
|
struct cgraph_node *node;
|
|
fibheap_t heap = fibheap_new ();
|
|
struct fibnode **heap_node =
|
|
xcalloc (cgraph_max_uid, sizeof (struct fibnode *));
|
|
int max_insns = ((HOST_WIDEST_INT) initial_insns
|
|
* (100 + PARAM_VALUE (PARAM_INLINE_UNIT_GROWTH)) / 100);
|
|
|
|
/* Put all inline candidates into the heap. */
|
|
|
|
for (node = cgraph_nodes; node; node = node->next)
|
|
{
|
|
if (!node->local.inlinable || !node->callers
|
|
|| node->local.disregard_inline_limits)
|
|
continue;
|
|
|
|
if (!cgraph_default_inline_p (node))
|
|
{
|
|
cgraph_set_inline_failed (node,
|
|
N_("--param max-inline-insns-single limit reached"));
|
|
continue;
|
|
}
|
|
heap_node[node->uid] =
|
|
fibheap_insert (heap, cgraph_estimate_growth (node), node);
|
|
}
|
|
|
|
if (dump_file)
|
|
fprintf (dump_file, "\nDeciding on smaller functions:\n");
|
|
while (overall_insns <= max_insns && (node = fibheap_extract_min (heap)))
|
|
{
|
|
struct cgraph_edge *e, *next;
|
|
int old_insns = overall_insns;
|
|
|
|
heap_node[node->uid] = NULL;
|
|
if (dump_file)
|
|
fprintf (dump_file,
|
|
"\nConsidering %s with %i insns\n"
|
|
" Estimated growth is %+i insns.\n",
|
|
cgraph_node_name (node), node->global.insns,
|
|
cgraph_estimate_growth (node));
|
|
if (!cgraph_default_inline_p (node))
|
|
{
|
|
cgraph_set_inline_failed (node,
|
|
N_("--param max-inline-insns-single limit reached after inlining into the callee"));
|
|
continue;
|
|
}
|
|
for (e = node->callers; e; e = next)
|
|
{
|
|
next = e->next_caller;
|
|
if (e->inline_failed)
|
|
{
|
|
struct cgraph_node *where;
|
|
|
|
if (cgraph_recursive_inlining_p (e->caller, e->callee,
|
|
&e->inline_failed)
|
|
|| !cgraph_check_inline_limits (e->caller, e->callee,
|
|
&e->inline_failed))
|
|
{
|
|
if (dump_file)
|
|
fprintf (dump_file, " Not inlining into %s:%s.\n",
|
|
cgraph_node_name (e->caller), e->inline_failed);
|
|
continue;
|
|
}
|
|
next = cgraph_mark_inline (e);
|
|
where = e->caller;
|
|
if (where->global.inlined_to)
|
|
where = where->global.inlined_to;
|
|
|
|
if (heap_node[where->uid])
|
|
fibheap_replace_key (heap, heap_node[where->uid],
|
|
cgraph_estimate_growth (where));
|
|
|
|
if (dump_file)
|
|
fprintf (dump_file,
|
|
" Inlined into %s which now has %i insns.\n",
|
|
cgraph_node_name (e->caller),
|
|
e->caller->global.insns);
|
|
}
|
|
}
|
|
|
|
cgraph_decide_recursive_inlining (node);
|
|
|
|
/* Similarly all functions called by the function we just inlined
|
|
are now called more times; update keys. */
|
|
update_callee_keys (heap, heap_node, node);
|
|
|
|
if (dump_file)
|
|
fprintf (dump_file,
|
|
" Inlined for a net change of %+i insns.\n",
|
|
overall_insns - old_insns);
|
|
}
|
|
while ((node = fibheap_extract_min (heap)) != NULL)
|
|
if (!node->local.disregard_inline_limits)
|
|
cgraph_set_inline_failed (node, N_("--param inline-unit-growth limit reached"));
|
|
fibheap_delete (heap);
|
|
free (heap_node);
|
|
}
|
|
|
|
/* Decide on the inlining. We do so in the topological order to avoid
|
|
expenses on updating data structures. */
|
|
|
|
static void
|
|
cgraph_decide_inlining (void)
|
|
{
|
|
struct cgraph_node *node;
|
|
int nnodes;
|
|
struct cgraph_node **order =
|
|
xcalloc (cgraph_n_nodes, sizeof (struct cgraph_node *));
|
|
int old_insns = 0;
|
|
int i;
|
|
|
|
for (node = cgraph_nodes; node; node = node->next)
|
|
initial_insns += node->local.self_insns;
|
|
overall_insns = initial_insns;
|
|
|
|
nnodes = cgraph_postorder (order);
|
|
|
|
if (dump_file)
|
|
fprintf (dump_file,
|
|
"\nDeciding on inlining. Starting with %i insns.\n",
|
|
initial_insns);
|
|
|
|
for (node = cgraph_nodes; node; node = node->next)
|
|
node->aux = 0;
|
|
|
|
if (dump_file)
|
|
fprintf (dump_file, "\nInlining always_inline functions:\n");
|
|
|
|
/* In the first pass mark all always_inline edges. Do this with a priority
|
|
so none of our later choices will make this impossible. */
|
|
for (i = nnodes - 1; i >= 0; i--)
|
|
{
|
|
struct cgraph_edge *e, *next;
|
|
|
|
node = order[i];
|
|
|
|
if (!node->local.disregard_inline_limits)
|
|
continue;
|
|
if (dump_file)
|
|
fprintf (dump_file,
|
|
"\nConsidering %s %i insns (always inline)\n",
|
|
cgraph_node_name (node), node->global.insns);
|
|
old_insns = overall_insns;
|
|
for (e = node->callers; e; e = next)
|
|
{
|
|
next = e->next_caller;
|
|
if (!e->inline_failed)
|
|
continue;
|
|
if (cgraph_recursive_inlining_p (e->caller, e->callee,
|
|
&e->inline_failed))
|
|
continue;
|
|
cgraph_mark_inline_edge (e);
|
|
if (dump_file)
|
|
fprintf (dump_file,
|
|
" Inlined into %s which now has %i insns.\n",
|
|
cgraph_node_name (e->caller),
|
|
e->caller->global.insns);
|
|
}
|
|
if (dump_file)
|
|
fprintf (dump_file,
|
|
" Inlined for a net change of %+i insns.\n",
|
|
overall_insns - old_insns);
|
|
}
|
|
|
|
if (!flag_really_no_inline)
|
|
{
|
|
cgraph_decide_inlining_of_small_functions ();
|
|
|
|
if (dump_file)
|
|
fprintf (dump_file, "\nDeciding on functions called once:\n");
|
|
|
|
/* And finally decide what functions are called once. */
|
|
|
|
for (i = nnodes - 1; i >= 0; i--)
|
|
{
|
|
node = order[i];
|
|
|
|
if (node->callers && !node->callers->next_caller && !node->needed
|
|
&& node->local.inlinable && node->callers->inline_failed
|
|
&& !DECL_EXTERNAL (node->decl) && !DECL_COMDAT (node->decl))
|
|
{
|
|
bool ok = true;
|
|
struct cgraph_node *node1;
|
|
|
|
/* Verify that we won't duplicate the caller. */
|
|
for (node1 = node->callers->caller;
|
|
node1->callers && !node1->callers->inline_failed
|
|
&& ok; node1 = node1->callers->caller)
|
|
if (node1->callers->next_caller || node1->needed)
|
|
ok = false;
|
|
if (ok)
|
|
{
|
|
if (dump_file)
|
|
fprintf (dump_file,
|
|
"\nConsidering %s %i insns.\n"
|
|
" Called once from %s %i insns.\n",
|
|
cgraph_node_name (node), node->global.insns,
|
|
cgraph_node_name (node->callers->caller),
|
|
node->callers->caller->global.insns);
|
|
|
|
old_insns = overall_insns;
|
|
|
|
if (cgraph_check_inline_limits (node->callers->caller, node,
|
|
NULL))
|
|
{
|
|
cgraph_mark_inline (node->callers);
|
|
if (dump_file)
|
|
fprintf (dump_file,
|
|
" Inlined into %s which now has %i insns"
|
|
" for a net change of %+i insns.\n",
|
|
cgraph_node_name (node->callers->caller),
|
|
node->callers->caller->global.insns,
|
|
overall_insns - old_insns);
|
|
}
|
|
else
|
|
{
|
|
if (dump_file)
|
|
fprintf (dump_file,
|
|
" Inline limit reached, not inlined.\n");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* We will never output extern functions we didn't inline.
|
|
??? Perhaps we can prevent accounting of growth of external
|
|
inline functions. */
|
|
cgraph_remove_unreachable_nodes (false, dump_file);
|
|
|
|
if (dump_file)
|
|
fprintf (dump_file,
|
|
"\nInlined %i calls, eliminated %i functions, "
|
|
"%i insns turned to %i insns.\n\n",
|
|
ncalls_inlined, nfunctions_inlined, initial_insns,
|
|
overall_insns);
|
|
free (order);
|
|
}
|
|
|
|
/* Decide on the inlining. We do so in the topological order to avoid
|
|
expenses on updating data structures. */
|
|
|
|
void
|
|
cgraph_decide_inlining_incrementally (struct cgraph_node *node)
|
|
{
|
|
struct cgraph_edge *e;
|
|
|
|
/* First of all look for always inline functions. */
|
|
for (e = node->callees; e; e = e->next_callee)
|
|
if (e->callee->local.disregard_inline_limits
|
|
&& e->inline_failed
|
|
&& !cgraph_recursive_inlining_p (node, e->callee, &e->inline_failed)
|
|
/* ??? It is possible that renaming variable removed the function body
|
|
in duplicate_decls. See gcc.c-torture/compile/20011119-2.c */
|
|
&& DECL_SAVED_TREE (e->callee->decl))
|
|
cgraph_mark_inline (e);
|
|
|
|
/* Now do the automatic inlining. */
|
|
if (!flag_really_no_inline)
|
|
for (e = node->callees; e; e = e->next_callee)
|
|
if (e->callee->local.inlinable
|
|
&& e->inline_failed
|
|
&& !e->callee->local.disregard_inline_limits
|
|
&& !cgraph_recursive_inlining_p (node, e->callee, &e->inline_failed)
|
|
&& cgraph_check_inline_limits (node, e->callee, &e->inline_failed)
|
|
&& DECL_SAVED_TREE (e->callee->decl))
|
|
{
|
|
if (cgraph_default_inline_p (e->callee))
|
|
cgraph_mark_inline (e);
|
|
else
|
|
e->inline_failed
|
|
= N_("--param max-inline-insns-single limit reached");
|
|
}
|
|
}
|
|
|
|
/* When inlining shall be performed. */
|
|
static bool
|
|
cgraph_gate_inlining (void)
|
|
{
|
|
return flag_inline_trees;
|
|
}
|
|
|
|
struct tree_opt_pass pass_ipa_inline =
|
|
{
|
|
"inline", /* name */
|
|
cgraph_gate_inlining, /* gate */
|
|
cgraph_decide_inlining, /* execute */
|
|
NULL, /* sub */
|
|
NULL, /* next */
|
|
0, /* static_pass_number */
|
|
TV_INTEGRATION, /* tv_id */
|
|
0, /* properties_required */
|
|
PROP_trees, /* properties_provided */
|
|
0, /* properties_destroyed */
|
|
0, /* todo_flags_start */
|
|
TODO_dump_cgraph | TODO_dump_func, /* todo_flags_finish */
|
|
0 /* letter */
|
|
};
|