/* Inlining decision heuristics.
- Copyright (C) 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004, 2007, 2008 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
+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
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, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
/* Inlining decision heuristics
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. */
+ only one function at a time and is used by early inliner.
+
+ The inliner itself is split into several passes:
+
+ pass_inline_parameters
+
+ This pass computes local properties of functions that are used by inliner:
+ estimated function body size, whether function is inlinable at all and
+ stack frame consumption.
+
+ Before executing any of inliner passes, this local pass has to be applied
+ to each function in the callgraph (ie run as subpass of some earlier
+ IPA pass). The results are made out of date by any optimization applied
+ on the function body.
+
+ pass_early_inlining
+
+ Simple local inlining pass inlining callees into current function. This
+ pass makes no global whole compilation unit analysis and this when allowed
+ to do inlining expanding code size it might result in unbounded growth of
+ whole unit.
+
+ The pass is run during conversion into SSA form. Only functions already
+ converted into SSA form are inlined, so the conversion must happen in
+ topological order on the callgraph (that is maintained by pass manager).
+ The functions after inlining are early optimized so the early inliner sees
+ unoptimized function itself, but all considered callees are already
+ optimized allowing it to unfold abstraction penalty on C++ effectively and
+ cheaply.
+
+ pass_ipa_early_inlining
+
+ With profiling, the early inlining is also necessary to reduce
+ instrumentation costs on program with high abstraction penalty (doing
+ many redundant calls). This can't happen in parallel with early
+ optimization and profile instrumentation, because we would end up
+ re-instrumenting already instrumented function bodies we brought in via
+ inlining.
+
+ To avoid this, this pass is executed as IPA pass before profiling. It is
+ simple wrapper to pass_early_inlining and ensures first inlining.
+
+ pass_ipa_inline
+
+ This is the main pass implementing simple greedy algorithm to do inlining
+ of small functions that results in overall growth of compilation unit and
+ inlining of functions called once. The pass compute just so called inline
+ plan (representation of inlining to be done in callgraph) and unlike early
+ inlining it is not performing the inlining itself.
+
+ pass_apply_inline
+
+ This pass performs actual inlining according to pass_ipa_inline on given
+ function. Possible the function body before inlining is saved when it is
+ needed for further inlining later.
+ */
#include "config.h"
#include "system.h"
#include "hashtab.h"
#include "coverage.h"
#include "ggc.h"
+#include "tree-flow.h"
+#include "rtl.h"
+#include "ipa-prop.h"
+
+/* Mode incremental inliner operate on:
+
+ In ALWAYS_INLINE only functions marked
+ always_inline are inlined. This mode is used after detecting cycle during
+ flattening.
+
+ In SIZE mode, only functions that reduce function body size after inlining
+ are inlined, this is used during early inlining.
+
+ in ALL mode, everything is inlined. This is used during flattening. */
+enum inlining_mode {
+ INLINE_NONE = 0,
+ INLINE_ALWAYS_INLINE,
+ INLINE_SIZE,
+ INLINE_ALL
+};
+static bool
+cgraph_decide_inlining_incrementally (struct cgraph_node *, enum inlining_mode,
+ int);
+
/* Statistics we collect about inlining algorithm. */
static int ncalls_inlined;
static int nfunctions_inlined;
-static int initial_insns;
static int overall_insns;
-static int max_insns;
static gcov_type max_count;
+/* Holders of ipa cgraph hooks: */
+static struct cgraph_node_hook_list *function_insertion_hook_holder;
+
+static inline struct inline_summary *
+inline_summary (struct cgraph_node *node)
+{
+ return &node->local.inline_summary;
+}
+
/* Estimate size of the function after inlining WHAT into TO. */
static int
clones or re-using node originally representing out-of-line function call.
*/
void
-cgraph_clone_inlined_nodes (struct cgraph_edge *e, bool duplicate, bool update_original)
+cgraph_clone_inlined_nodes (struct cgraph_edge *e, bool duplicate,
+ bool update_original)
{
+ HOST_WIDE_INT peak;
+
if (duplicate)
{
/* 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
- && flag_unit_at_a_time)
+ && !cgraph_new_nodes)
{
gcc_assert (!e->callee->global.inlined_to);
- if (DECL_SAVED_TREE (e->callee->decl))
+ if (e->callee->analyzed)
overall_insns -= e->callee->global.insns, nfunctions_inlined++;
duplicate = false;
}
else
{
struct cgraph_node *n;
- n = cgraph_clone_node (e->callee, e->count, e->loop_nest,
+ n = cgraph_clone_node (e->callee, e->count, e->frequency, e->loop_nest,
update_original);
cgraph_redirect_edge_callee (e, n);
}
e->callee->global.inlined_to = e->caller->global.inlined_to;
else
e->callee->global.inlined_to = e->caller;
+ e->callee->global.stack_frame_offset
+ = e->caller->global.stack_frame_offset
+ + inline_summary (e->caller)->estimated_self_stack_size;
+ peak = e->callee->global.stack_frame_offset
+ + inline_summary (e->callee)->estimated_self_stack_size;
+ if (e->callee->global.inlined_to->global.estimated_stack_size < peak)
+ e->callee->global.inlined_to->global.estimated_stack_size = peak;
/* Recursively clone all bodies. */
for (e = e->callee->callees; e; e = e->next_callee)
cgraph_clone_inlined_nodes (e, duplicate, update_original);
}
-/* Mark edge E as inlined and update callgraph accordingly.
- UPDATE_ORIGINAL specify whether profile of original function should be
- updated. */
+/* Mark edge E as inlined and update callgraph accordingly. UPDATE_ORIGINAL
+ specify whether profile of original function should be updated. If any new
+ indirect edges are discovered in the process, add them to NEW_EDGES, unless
+ it is NULL. Return true iff any new callgraph edges were discovered as a
+ result of inlining. */
-void
-cgraph_mark_inline_edge (struct cgraph_edge *e, bool update_original)
+static bool
+cgraph_mark_inline_edge (struct cgraph_edge *e, bool update_original,
+ VEC (cgraph_edge_p, heap) **new_edges)
{
int old_insns = 0, new_insns = 0;
struct cgraph_node *to = NULL, *what;
+ struct cgraph_edge *curr = e;
if (e->callee->inline_decl)
cgraph_redirect_edge_callee (e, cgraph_node (e->callee->inline_decl));
gcc_assert (e->inline_failed);
e->inline_failed = NULL;
- if (!e->callee->global.inlined && flag_unit_at_a_time)
+ if (!e->callee->global.inlined)
DECL_POSSIBLY_INLINED (e->callee->decl) = true;
e->callee->global.inlined = true;
if (new_insns > old_insns)
overall_insns += new_insns - old_insns;
ncalls_inlined++;
+
+ if (flag_indirect_inlining)
+ return ipa_propagate_indirect_call_infos (curr, new_edges);
+ else
+ return false;
}
/* Mark all calls of EDGE->CALLEE inlined into EDGE->CALLER.
struct cgraph_node *to = edge->caller;
struct cgraph_node *what = edge->callee;
struct cgraph_edge *e, *next;
- int times = 0;
+ gcc_assert (!gimple_call_cannot_inline_p (edge->call_stmt));
/* 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, true);
+ cgraph_mark_inline_edge (e, true, NULL);
if (e == edge)
edge = next;
- times++;
}
}
- gcc_assert (times);
+
return edge;
}
{
int growth = 0;
struct cgraph_edge *e;
+ bool self_recursive = false;
+
if (node->global.estimated_growth != INT_MIN)
return node->global.estimated_growth;
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);
+ {
+ if (e->caller == node)
+ self_recursive = true;
+ 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))
+ /* ??? Wrong for non-trivially 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) && !self_recursive)
growth -= node->global.insns;
node->global.estimated_growth = growth;
}
/* Return false when inlining WHAT into TO is not good idea
- as it would cause too large growth of function bodies. */
+ as it would cause too large growth of function bodies.
+ When ONE_ONLY is true, assume that only one call site is going
+ to be inlined, otherwise figure out how many call sites in
+ TO calls WHAT and verify that all can be inlined.
+ */
static bool
cgraph_check_inline_limits (struct cgraph_node *to, struct cgraph_node *what,
- const char **reason)
+ const char **reason, bool one_only)
{
int times = 0;
struct cgraph_edge *e;
int newsize;
int limit;
+ HOST_WIDE_INT stack_size_limit, inlined_stack;
- for (e = to->callees; e; e = e->next_callee)
- if (e->callee == what)
- times++;
+ if (one_only)
+ times = 1;
+ else
+ for (e = to->callees; e; e = e->next_callee)
+ if (e->callee == what)
+ times++;
if (to->global.inlined_to)
to = to->global.inlined_to;
/* 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;
+ if (inline_summary (to)->self_insns > inline_summary(what)->self_insns)
+ limit = inline_summary (to)->self_insns;
else
- limit = what->local.self_insns;
+ limit = inline_summary (what)->self_insns;
limit += limit * PARAM_VALUE (PARAM_LARGE_FUNCTION_GROWTH) / 100;
*reason = N_("--param large-function-growth limit reached");
return false;
}
+
+ stack_size_limit = inline_summary (to)->estimated_self_stack_size;
+
+ stack_size_limit += stack_size_limit * PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) / 100;
+
+ inlined_stack = (to->global.stack_frame_offset
+ + inline_summary (to)->estimated_self_stack_size
+ + what->global.estimated_stack_size);
+ if (inlined_stack > stack_size_limit
+ && inlined_stack > PARAM_VALUE (PARAM_LARGE_STACK_FRAME))
+ {
+ if (reason)
+ *reason = N_("--param large-stack-frame-growth limit reached");
+ return false;
+ }
return true;
}
if (n->inline_decl)
decl = n->inline_decl;
- if (!DECL_INLINE (decl))
+ if (!flag_inline_small_functions && !DECL_DECLARED_INLINE_P (decl))
{
if (reason)
- *reason = N_("function not inlinable");
+ *reason = N_("function not inline candidate");
return false;
}
return recursive;
}
-/* Return true if the call can be hot. */
-static bool
-cgraph_maybe_hot_edge_p (struct cgraph_edge *edge)
-{
- if (profile_info && flag_branch_probabilities
- && (edge->count
- <= profile_info->sum_max / PARAM_VALUE (HOT_BB_COUNT_FRACTION)))
- return false;
- return true;
-}
-
/* A cost model driving the inlining heuristics in a way so the edges with
smallest badness are inlined first. After each inlining is performed
the costs of all caller edges of nodes affected are recomputed so the
metrics may accurately depend on values such as number of inlinable callers
- of the function or function body size.
-
- With profiling we use number of executions of each edge to drive the cost.
- We also should distinguish hot and cold calls where the cold calls are
- inlined into only when code size is overall improved.
- */
+ of the function or function body size. */
static int
cgraph_edge_badness (struct cgraph_edge *edge)
{
- if (max_count)
+ int badness;
+ int growth =
+ cgraph_estimate_size_after_inlining (1, edge->caller, edge->callee);
+
+ growth -= edge->caller->global.insns;
+
+ /* Always prefer inlining saving code size. */
+ if (growth <= 0)
+ badness = INT_MIN - growth;
+
+ /* When profiling is available, base priorities -(#calls / growth).
+ So we optimize for overall number of "executed" inlined calls. */
+ else if (max_count)
+ badness = ((int)((double)edge->count * INT_MIN / max_count)) / growth;
+
+ /* When function local profile is available, base priorities on
+ growth / frequency, so we optimize for overall frequency of inlined
+ calls. This is not too accurate since while the call might be frequent
+ within function, the function itself is infrequent.
+
+ Other objective to optimize for is number of different calls inlined.
+ We add the estimated growth after inlining all functions to bias the
+ priorities slightly in this direction (so fewer times called functions
+ of the same size gets priority). */
+ else if (flag_guess_branch_prob)
{
+ int div = edge->frequency * 100 / CGRAPH_FREQ_BASE;
int growth =
cgraph_estimate_size_after_inlining (1, edge->caller, edge->callee);
growth -= edge->caller->global.insns;
+ badness = growth * 256;
+
+ /* Decrease badness if call is nested. */
+ /* Compress the range so we don't overflow. */
+ if (div > 256)
+ div = 256 + ceil_log2 (div) - 8;
+ if (div < 1)
+ div = 1;
+ if (badness > 0)
+ badness /= div;
+ badness += cgraph_estimate_growth (edge->callee);
+ }
+ /* When function local profile is not available or it does not give
+ useful information (ie frequency is zero), base the cost on
+ loop nest and overall size growth, so we optimize for overall number
+ of functions fully inlined in program. */
+ else
+ {
+ int nest = MIN (edge->loop_nest, 8);
+ badness = cgraph_estimate_growth (edge->callee) * 256;
- /* Always prefer inlining saving code size. */
- if (growth <= 0)
- return INT_MIN - growth;
- return ((int)((double)edge->count * INT_MIN / max_count)) / growth;
+ /* Decrease badness if call is nested. */
+ if (badness > 0)
+ badness >>= nest;
+ else
+ {
+ badness <<= nest;
+ }
}
+ /* Make recursive inlining happen always after other inlining is done. */
+ if (cgraph_recursive_inlining_p (edge->caller, edge->callee, NULL))
+ return badness + 1;
else
- {
- int nest = MIN (edge->loop_nest, 8);
- int badness = cgraph_estimate_growth (edge->callee) * 256;
-
- /* Decrease badness if call is nested. */
- if (badness > 0)
- badness >>= nest;
- else
- badness <<= nest;
-
- /* Make recursive inlining happen always after other inlining is done. */
- if (cgraph_recursive_inlining_p (edge->caller, edge->callee, NULL))
- return badness + 1;
- else
- return badness;
- }
+ return badness;
}
/* Recompute heap nodes for each of caller edge. */
for (edge = node->callers; edge; edge = edge->next_caller)
if (edge->aux)
{
- fibheap_delete_node (heap, edge->aux);
+ fibheap_delete_node (heap, (fibnode_t) edge->aux);
edge->aux = NULL;
if (edge->inline_failed)
edge->inline_failed = failed_reason;
int badness = cgraph_edge_badness (edge);
if (edge->aux)
{
- fibnode_t n = edge->aux;
+ fibnode_t n = (fibnode_t) edge->aux;
gcc_assert (n->data == edge);
if (n->key == badness)
continue;
/* fibheap_replace_key only increase the keys. */
if (fibheap_replace_key (heap, n, badness))
continue;
- fibheap_delete_node (heap, edge->aux);
+ fibheap_delete_node (heap, (fibnode_t) edge->aux);
}
edge->aux = fibheap_insert (heap, badness, edge);
}
lookup_recursive_calls (node, e->callee, heap);
}
-/* Find callgraph nodes closing a circle in the graph. The
- resulting hashtab can be used to avoid walking the circles.
- Uses the cgraph nodes ->aux field which needs to be zero
- before and will be zero after operation. */
-
-static void
-cgraph_find_cycles (struct cgraph_node *node, htab_t cycles)
-{
- struct cgraph_edge *e;
-
- if (node->aux)
- {
- void **slot;
- slot = htab_find_slot (cycles, node, INSERT);
- if (!*slot)
- {
- if (dump_file)
- fprintf (dump_file, "Cycle contains %s\n", cgraph_node_name (node));
- *slot = node;
- }
- return;
- }
-
- node->aux = node;
- for (e = node->callees; e; e = e->next_callee)
- cgraph_find_cycles (e->callee, cycles);
- node->aux = 0;
-}
-
-/* Leafify the cgraph node. We have to be careful in recursing
- as to not run endlessly in circles of the callgraph.
- We do so by using a hashtab of cycle entering nodes as generated
- by cgraph_find_cycles. */
-
-static void
-cgraph_flatten_node (struct cgraph_node *node, htab_t cycles)
-{
- struct cgraph_edge *e;
-
- for (e = node->callees; e; e = e->next_callee)
- {
- /* Inline call, if possible, and recurse. Be sure we are not
- entering callgraph circles here. */
- if (e->inline_failed
- && e->callee->local.inlinable
- && !cgraph_recursive_inlining_p (node, e->callee,
- &e->inline_failed)
- && !htab_find (cycles, e->callee))
- {
- if (dump_file)
- fprintf (dump_file, " inlining %s", cgraph_node_name (e->callee));
- cgraph_mark_inline_edge (e, true);
- cgraph_flatten_node (e->callee, cycles);
- }
- else if (dump_file)
- fprintf (dump_file, " !inlining %s", cgraph_node_name (e->callee));
- }
-}
-
/* Decide on recursive inlining: in the case function has recursive calls,
- inline until body size reaches given argument. */
+ inline until body size reaches given argument. If any new indirect edges
+ are discovered in the process, add them to *NEW_EDGES, unless NEW_EDGES
+ is NULL. */
static bool
-cgraph_decide_recursive_inlining (struct cgraph_node *node)
+cgraph_decide_recursive_inlining (struct cgraph_node *node,
+ VEC (cgraph_edge_p, heap) **new_edges)
{
int limit = PARAM_VALUE (PARAM_MAX_INLINE_INSNS_RECURSIVE_AUTO);
int max_depth = PARAM_VALUE (PARAM_MAX_INLINE_RECURSIVE_DEPTH_AUTO);
int probability = PARAM_VALUE (PARAM_MIN_INLINE_RECURSIVE_PROBABILITY);
fibheap_t heap;
struct cgraph_edge *e;
- struct cgraph_node *master_clone;
+ struct cgraph_node *master_clone, *next;
int depth = 0;
int n = 0;
+ if (optimize_function_for_size_p (DECL_STRUCT_FUNCTION (node->decl))
+ || (!flag_inline_functions && !DECL_DECLARED_INLINE_P (node->decl)))
+ return false;
+
if (DECL_DECLARED_INLINE_P (node->decl))
{
limit = PARAM_VALUE (PARAM_MAX_INLINE_INSNS_RECURSIVE);
cgraph_node_name (node));
/* We need original clone to copy around. */
- master_clone = cgraph_clone_node (node, node->count, 1, false);
+ master_clone = cgraph_clone_node (node, node->count, CGRAPH_FREQ_BASE, 1, false);
master_clone->needed = true;
for (e = master_clone->callees; e; e = e->next_callee)
if (!e->inline_failed)
&& (cgraph_estimate_size_after_inlining (1, node, master_clone)
<= limit))
{
- struct cgraph_edge *curr = fibheap_extract_min (heap);
+ struct cgraph_edge *curr
+ = (struct cgraph_edge *) fibheap_extract_min (heap);
struct cgraph_node *cnode;
depth = 1;
{
if (dump_file)
fprintf (dump_file,
- " maxmal depth reached\n");
+ " maximal depth reached\n");
continue;
}
fprintf (dump_file, "\n");
}
cgraph_redirect_edge_callee (curr, master_clone);
- cgraph_mark_inline_edge (curr, false);
+ cgraph_mark_inline_edge (curr, false, new_edges);
lookup_recursive_calls (node, curr->callee, heap);
n++;
}
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);
+ node = next)
+ {
+ next = node->next;
+ if (node->global.inlined_to == master_clone)
+ cgraph_remove_node (node);
+ }
cgraph_remove_node (master_clone);
/* FIXME: Recursive inlining actually reduces number of calls of the
function. At this place we should probably walk the function and
e->inline_failed = reason;
}
+/* Given whole compilation unit estimate of INSNS, compute how large we can
+ allow the unit to grow. */
+static int
+compute_max_insns (int insns)
+{
+ int max_insns = insns;
+ if (max_insns < PARAM_VALUE (PARAM_LARGE_UNIT_INSNS))
+ max_insns = PARAM_VALUE (PARAM_LARGE_UNIT_INSNS);
+
+ return ((HOST_WIDEST_INT) max_insns
+ * (100 + PARAM_VALUE (PARAM_INLINE_UNIT_GROWTH)) / 100);
+}
+
+/* Compute badness of all edges in NEW_EDGES and add them to the HEAP. */
+static void
+add_new_edges_to_heap (fibheap_t heap, VEC (cgraph_edge_p, heap) *new_edges)
+{
+ while (VEC_length (cgraph_edge_p, new_edges) > 0)
+ {
+ struct cgraph_edge *edge = VEC_pop (cgraph_edge_p, new_edges);
+
+ gcc_assert (!edge->aux);
+ edge->aux = fibheap_insert (heap, cgraph_edge_badness (edge), edge);
+ }
+}
+
+
/* 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.
const char *failed_reason;
fibheap_t heap = fibheap_new ();
bitmap updated_nodes = BITMAP_ALLOC (NULL);
+ int min_insns, max_insns;
+ VEC (cgraph_edge_p, heap) *new_indirect_edges = NULL;
+
+ if (flag_indirect_inlining)
+ new_indirect_edges = VEC_alloc (cgraph_edge_p, heap, 8);
if (dump_file)
fprintf (dump_file, "\nDeciding on smaller functions:\n");
edge->aux = fibheap_insert (heap, cgraph_edge_badness (edge), edge);
}
}
- while (overall_insns <= max_insns && (edge = fibheap_extract_min (heap)))
+
+ max_insns = compute_max_insns (overall_insns);
+ min_insns = overall_insns;
+
+ while (overall_insns <= max_insns
+ && (edge = (struct cgraph_edge *) fibheap_extract_min (heap)))
{
int old_insns = overall_insns;
struct cgraph_node *where;
int growth =
cgraph_estimate_size_after_inlining (1, edge->caller, edge->callee);
+ const char *not_good = NULL;
growth -= edge->caller->global.insns;
fprintf (dump_file,
" to be inlined into %s\n"
" Estimated growth after inlined into all callees is %+i insns.\n"
- " Estimated badness is %i.\n",
+ " Estimated badness is %i, frequency %.2f.\n",
cgraph_node_name (edge->caller),
cgraph_estimate_growth (edge->callee),
- cgraph_edge_badness (edge));
+ cgraph_edge_badness (edge),
+ edge->frequency / (double)CGRAPH_FREQ_BASE);
if (edge->count)
fprintf (dump_file," Called "HOST_WIDEST_INT_PRINT_DEC"x\n", edge->count);
}
is not good idea so prohibit the recursive inlining.
??? When the frequencies are taken into account we might not need this
- restriction. */
- if (!max_count)
+ restriction.
+
+ We need to be cureful here, in some testcases, e.g. directivec.c in
+ libcpp, we can estimate self recursive function to have negative growth
+ for inlining completely.
+ */
+ if (!edge->count)
{
where = edge->caller;
while (where->global.inlined_to)
}
}
- if (!cgraph_maybe_hot_edge_p (edge) && growth > 0)
+ if (!cgraph_maybe_hot_edge_p (edge))
+ not_good = N_("call is unlikely and code size would grow");
+ if (!flag_inline_functions
+ && !DECL_DECLARED_INLINE_P (edge->callee->decl))
+ not_good = N_("function not declared inline and code size would grow");
+ if (optimize_function_for_size_p (DECL_STRUCT_FUNCTION(edge->caller->decl)))
+ not_good = N_("optimizing for size and code size would grow");
+ if (not_good && growth > 0 && cgraph_estimate_growth (edge->callee) > 0)
{
if (!cgraph_recursive_inlining_p (edge->caller, edge->callee,
&edge->inline_failed))
{
- edge->inline_failed =
- N_("call is unlikely");
+ edge->inline_failed = not_good;
if (dump_file)
fprintf (dump_file, " inline_failed:%s.\n", edge->inline_failed);
}
}
continue;
}
+ if (!tree_can_inline_p (edge->caller->decl, edge->callee->decl))
+ {
+ gimple_call_set_cannot_inline (edge->call_stmt, true);
+ edge->inline_failed = N_("target specific option mismatch");
+ if (dump_file)
+ fprintf (dump_file, " inline_failed:%s.\n", edge->inline_failed);
+ continue;
+ }
if (cgraph_recursive_inlining_p (edge->caller, edge->callee,
&edge->inline_failed))
{
where = edge->caller;
if (where->global.inlined_to)
where = where->global.inlined_to;
- if (!cgraph_decide_recursive_inlining (where))
+ if (!cgraph_decide_recursive_inlining (where,
+ flag_indirect_inlining
+ ? &new_indirect_edges : NULL))
continue;
+ if (flag_indirect_inlining)
+ add_new_edges_to_heap (heap, new_indirect_edges);
update_callee_keys (heap, where, updated_nodes);
}
else
{
struct cgraph_node *callee;
- if (!cgraph_check_inline_limits (edge->caller, edge->callee,
- &edge->inline_failed))
+ if (gimple_call_cannot_inline_p (edge->call_stmt)
+ || !cgraph_check_inline_limits (edge->caller, edge->callee,
+ &edge->inline_failed, true))
{
if (dump_file)
fprintf (dump_file, " Not inlining into %s:%s.\n",
continue;
}
callee = edge->callee;
- cgraph_mark_inline_edge (edge, true);
+ cgraph_mark_inline_edge (edge, true, &new_indirect_edges);
+ if (flag_indirect_inlining)
+ add_new_edges_to_heap (heap, new_indirect_edges);
+
update_callee_keys (heap, callee, updated_nodes);
}
where = edge->caller;
edge->caller->global.insns,
overall_insns - old_insns);
}
+ if (min_insns > overall_insns)
+ {
+ min_insns = overall_insns;
+ max_insns = compute_max_insns (min_insns);
+
+ if (dump_file)
+ fprintf (dump_file, "New minimal insns reached: %i\n", min_insns);
+ }
}
- while ((edge = fibheap_extract_min (heap)) != NULL)
+ while ((edge = (struct cgraph_edge *) fibheap_extract_min (heap)) != NULL)
{
gcc_assert (edge->aux);
edge->aux = NULL;
&edge->inline_failed))
edge->inline_failed = N_("--param inline-unit-growth limit reached");
}
+
+ if (new_indirect_edges)
+ VEC_free (cgraph_edge_p, heap, new_indirect_edges);
fibheap_delete (heap);
BITMAP_FREE (updated_nodes);
}
XCNEWVEC (struct cgraph_node *, cgraph_n_nodes);
int old_insns = 0;
int i;
+ int initial_insns = 0;
+ bool redo_always_inline = true;
+
+ cgraph_remove_function_insertion_hook (function_insertion_hook_holder);
- timevar_push (TV_INLINE_HEURISTICS);
max_count = 0;
for (node = cgraph_nodes; node; node = node->next)
- {
- struct cgraph_edge *e;
- initial_insns += node->local.self_insns;
- for (e = node->callees; e; e = e->next_callee)
- if (max_count < e->count)
- max_count = e->count;
- }
+ if (node->analyzed && (node->needed || node->reachable))
+ {
+ struct cgraph_edge *e;
+
+ initial_insns += inline_summary (node)->self_insns;
+ gcc_assert (inline_summary (node)->self_insns == node->global.insns);
+ for (e = node->callees; e; e = e->next_callee)
+ if (max_count < e->count)
+ max_count = e->count;
+ }
overall_insns = initial_insns;
gcc_assert (!max_count || (profile_info && flag_branch_probabilities));
- max_insns = overall_insns;
- if (max_insns < PARAM_VALUE (PARAM_LARGE_UNIT_INSNS))
- max_insns = PARAM_VALUE (PARAM_LARGE_UNIT_INSNS);
-
- max_insns = ((HOST_WIDEST_INT) max_insns
- * (100 + PARAM_VALUE (PARAM_INLINE_UNIT_GROWTH)) / 100);
-
nnodes = cgraph_postorder (order);
if (dump_file)
/* 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--)
+ while (redo_always_inline)
{
- struct cgraph_edge *e, *next;
+ redo_always_inline = false;
+ for (i = nnodes - 1; i >= 0; i--)
+ {
+ struct cgraph_edge *e, *next;
- node = order[i];
+ node = order[i];
- /* Handle nodes to be flattened, but don't update overall unit size. */
- if (lookup_attribute ("flatten", DECL_ATTRIBUTES (node->decl)) != NULL)
- {
- int old_overall_insns = overall_insns;
- htab_t cycles;
- if (dump_file)
- fprintf (dump_file,
- "Leafifying %s\n", cgraph_node_name (node));
- cycles = htab_create (7, htab_hash_pointer, htab_eq_pointer, NULL);
- cgraph_find_cycles (node, cycles);
- cgraph_flatten_node (node, cycles);
- htab_delete (cycles);
- overall_insns = old_overall_insns;
- /* We don't need to consider always_inline functions inside the flattened
- function anymore. */
- continue;
- }
+ /* Handle nodes to be flattened, but don't update overall unit
+ size. */
+ if (lookup_attribute ("flatten",
+ DECL_ATTRIBUTES (node->decl)) != NULL)
+ {
+ if (dump_file)
+ fprintf (dump_file,
+ "Flattening %s\n", cgraph_node_name (node));
+ cgraph_decide_inlining_incrementally (node, INLINE_ALL, 0);
+ }
- 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))
+ if (!node->local.disregard_inline_limits)
continue;
- cgraph_mark_inline_edge (e, true);
+ 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
+ || gimple_call_cannot_inline_p (e->call_stmt))
+ continue;
+ if (cgraph_recursive_inlining_p (e->caller, e->callee,
+ &e->inline_failed))
+ continue;
+ if (!tree_can_inline_p (e->caller->decl, e->callee->decl))
+ {
+ gimple_call_set_cannot_inline (e->call_stmt, true);
+ continue;
+ }
+ if (cgraph_mark_inline_edge (e, true, NULL))
+ redo_always_inline = true;
+ if (dump_file)
+ fprintf (dump_file,
+ " Inlined into %s which now has %i insns.\n",
+ cgraph_node_name (e->caller),
+ e->caller->global.insns);
+ }
+ /* Inlining self recursive function might introduce new calls to
+ themselves we didn't see in the loop above. Fill in the proper
+ reason why inline failed. */
+ for (e = node->callers; e; e = e->next_caller)
+ if (e->inline_failed)
+ e->inline_failed = N_("recursive inlining");
if (dump_file)
fprintf (dump_file,
- " Inlined into %s which now has %i insns.\n",
- cgraph_node_name (e->caller),
- e->caller->global.insns);
+ " Inlined for a net change of %+i insns.\n",
+ overall_insns - old_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 ();
+ cgraph_decide_inlining_of_small_functions ();
- if (!flag_really_no_inline
- && flag_inline_functions_called_once)
+ if (flag_inline_functions_called_once)
{
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))
+ if (node->callers
+ && !node->callers->next_caller
+ && !node->needed
+ && node->local.inlinable
+ && node->callers->inline_failed
+ && !gimple_call_cannot_inline_p (node->callers->call_stmt)
+ && !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",
+ cgraph_node_name (node), node->global.insns);
+ fprintf (dump_file,
+ " Called once from %s %i insns.\n",
+ 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, false))
+ {
+ 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,
- "\nConsidering %s %i insns.\n",
- cgraph_node_name (node), node->global.insns);
- fprintf (dump_file,
- " Called once from %s %i insns.\n",
- 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");
- }
+ fprintf (dump_file,
+ " Inline limit reached, not inlined.\n");
}
}
}
}
+ /* Free ipa-prop structures if they are no longer needed. */
+ if (flag_indirect_inlining)
+ free_all_ipa_structures_after_iinln ();
+
if (dump_file)
fprintf (dump_file,
"\nInlined %i calls, eliminated %i functions, "
ncalls_inlined, nfunctions_inlined, initial_insns,
overall_insns);
free (order);
- timevar_pop (TV_INLINE_HEURISTICS);
return 0;
}
+/* Try to inline edge E from incremental inliner. MODE specifies mode
+ of inliner.
+
+ We are detecting cycles by storing mode of inliner into cgraph_node last
+ time we visited it in the recursion. In general when mode is set, we have
+ recursive inlining, but as an special case, we want to try harder inline
+ ALWAYS_INLINE functions: consider callgraph a->b->c->b, with a being
+ flatten, b being always inline. Flattening 'a' will collapse
+ a->b->c before hitting cycle. To accommodate always inline, we however
+ need to inline a->b->c->b.
+
+ So after hitting cycle first time, we switch into ALWAYS_INLINE mode and
+ stop inlining only after hitting ALWAYS_INLINE in ALWAY_INLINE mode. */
+static bool
+try_inline (struct cgraph_edge *e, enum inlining_mode mode, int depth)
+{
+ struct cgraph_node *callee = e->callee;
+ enum inlining_mode callee_mode = (enum inlining_mode) (size_t) callee->aux;
+ bool always_inline = e->callee->local.disregard_inline_limits;
+
+ /* We've hit cycle? */
+ if (callee_mode)
+ {
+ /* It is first time we see it and we are not in ALWAY_INLINE only
+ mode yet. and the function in question is always_inline. */
+ if (always_inline && mode != INLINE_ALWAYS_INLINE)
+ {
+ if (dump_file)
+ {
+ indent_to (dump_file, depth);
+ fprintf (dump_file,
+ "Hit cycle in %s, switching to always inline only.\n",
+ cgraph_node_name (callee));
+ }
+ mode = INLINE_ALWAYS_INLINE;
+ }
+ /* Otherwise it is time to give up. */
+ else
+ {
+ if (dump_file)
+ {
+ indent_to (dump_file, depth);
+ fprintf (dump_file,
+ "Not inlining %s into %s to avoid cycle.\n",
+ cgraph_node_name (callee),
+ cgraph_node_name (e->caller));
+ }
+ e->inline_failed = (e->callee->local.disregard_inline_limits
+ ? N_("recursive inlining") : "");
+ return false;
+ }
+ }
+
+ callee->aux = (void *)(size_t) mode;
+ if (dump_file)
+ {
+ indent_to (dump_file, depth);
+ fprintf (dump_file, " Inlining %s into %s.\n",
+ cgraph_node_name (e->callee),
+ cgraph_node_name (e->caller));
+ }
+ if (e->inline_failed)
+ cgraph_mark_inline (e);
+
+ /* In order to fully inline always_inline functions, we need to
+ recurse here, since the inlined functions might not be processed by
+ incremental inlining at all yet.
+
+ Also flattening needs to be done recursively. */
+
+ if (mode == INLINE_ALL || always_inline)
+ cgraph_decide_inlining_incrementally (e->callee, mode, depth + 1);
+ callee->aux = (void *)(size_t) callee_mode;
+ return true;
+}
+
/* Decide on the inlining. We do so in the topological order to avoid
- expenses on updating data structures. */
+ expenses on updating data structures.
+ DEPTH is depth of recursion, used only for debug output. */
-bool
-cgraph_decide_inlining_incrementally (struct cgraph_node *node, bool early)
+static bool
+cgraph_decide_inlining_incrementally (struct cgraph_node *node,
+ enum inlining_mode mode,
+ int depth)
{
struct cgraph_edge *e;
bool inlined = false;
const char *failed_reason;
+ enum inlining_mode old_mode;
+
+#ifdef ENABLE_CHECKING
+ verify_cgraph_node (node);
+#endif
+
+ old_mode = (enum inlining_mode) (size_t)node->aux;
+
+ if (mode != INLINE_ALWAYS_INLINE
+ && lookup_attribute ("flatten", DECL_ATTRIBUTES (node->decl)) != NULL)
+ {
+ if (dump_file)
+ {
+ indent_to (dump_file, depth);
+ fprintf (dump_file, "Flattening %s\n", cgraph_node_name (node));
+ }
+ mode = INLINE_ALL;
+ }
+
+ node->aux = (void *)(size_t) mode;
/* 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) || e->callee->inline_decl))
+ {
+ if (!e->callee->local.disregard_inline_limits
+ && (mode != INLINE_ALL || !e->callee->local.inlinable))
+ continue;
+ if (gimple_call_cannot_inline_p (e->call_stmt))
+ continue;
+ /* When the edge is already inlined, we just need to recurse into
+ it in order to fully flatten the leaves. */
+ if (!e->inline_failed && mode == INLINE_ALL)
+ {
+ inlined |= try_inline (e, mode, depth);
+ continue;
+ }
+ if (dump_file)
+ {
+ indent_to (dump_file, depth);
+ fprintf (dump_file,
+ "Considering to always inline inline candidate %s.\n",
+ cgraph_node_name (e->callee));
+ }
+ if (cgraph_recursive_inlining_p (node, e->callee, &e->inline_failed))
+ {
+ if (dump_file)
+ {
+ indent_to (dump_file, depth);
+ fprintf (dump_file, "Not inlining: recursive call.\n");
+ }
+ continue;
+ }
+ if (!tree_can_inline_p (node->decl, e->callee->decl))
+ {
+ gimple_call_set_cannot_inline (e->call_stmt, true);
+ if (dump_file)
+ {
+ indent_to (dump_file, depth);
+ fprintf (dump_file,
+ "Not inlining: Target specific option mismatch.\n");
+ }
+ continue;
+ }
+ if (gimple_in_ssa_p (DECL_STRUCT_FUNCTION (node->decl))
+ != gimple_in_ssa_p (DECL_STRUCT_FUNCTION (e->callee->decl)))
+ {
+ if (dump_file)
+ {
+ indent_to (dump_file, depth);
+ fprintf (dump_file, "Not inlining: SSA form does not match.\n");
+ }
+ continue;
+ }
+ if (!e->callee->analyzed && !e->callee->inline_decl)
+ {
+ if (dump_file)
+ {
+ indent_to (dump_file, depth);
+ fprintf (dump_file,
+ "Not inlining: Function body no longer available.\n");
+ }
+ continue;
+ }
+ inlined |= try_inline (e, mode, depth);
+ }
+
+ /* Now do the automatic inlining. */
+ if (mode != INLINE_ALL && mode != INLINE_ALWAYS_INLINE)
+ for (e = node->callees; e; e = e->next_callee)
{
- if (dump_file && early)
+ if (!e->callee->local.inlinable
+ || !e->inline_failed
+ || e->callee->local.disregard_inline_limits)
+ continue;
+ if (dump_file)
+ fprintf (dump_file, "Considering inline candidate %s.\n",
+ cgraph_node_name (e->callee));
+ if (cgraph_recursive_inlining_p (node, e->callee, &e->inline_failed))
+ {
+ if (dump_file)
+ {
+ indent_to (dump_file, depth);
+ fprintf (dump_file, "Not inlining: recursive call.\n");
+ }
+ continue;
+ }
+ if (gimple_in_ssa_p (DECL_STRUCT_FUNCTION (node->decl))
+ != gimple_in_ssa_p (DECL_STRUCT_FUNCTION (e->callee->decl)))
+ {
+ if (dump_file)
+ {
+ indent_to (dump_file, depth);
+ fprintf (dump_file, "Not inlining: SSA form does not match.\n");
+ }
+ continue;
+ }
+ /* When the function body would grow and inlining the function won't
+ eliminate the need for offline copy of the function, don't inline.
+ */
+ if ((mode == INLINE_SIZE
+ || (!flag_inline_functions
+ && !DECL_DECLARED_INLINE_P (e->callee->decl)))
+ && (cgraph_estimate_size_after_inlining (1, e->caller, e->callee)
+ > e->caller->global.insns)
+ && cgraph_estimate_growth (e->callee) > 0)
+ {
+ if (dump_file)
+ {
+ indent_to (dump_file, depth);
+ fprintf (dump_file,
+ "Not inlining: code size would grow by %i insns.\n",
+ cgraph_estimate_size_after_inlining (1, e->caller,
+ e->callee)
+ - e->caller->global.insns);
+ }
+ continue;
+ }
+ if (!cgraph_check_inline_limits (node, e->callee, &e->inline_failed,
+ false)
+ || gimple_call_cannot_inline_p (e->call_stmt))
+ {
+ if (dump_file)
+ {
+ indent_to (dump_file, depth);
+ fprintf (dump_file, "Not inlining: %s.\n", e->inline_failed);
+ }
+ continue;
+ }
+ if (!e->callee->analyzed && !e->callee->inline_decl)
+ {
+ if (dump_file)
+ {
+ indent_to (dump_file, depth);
+ fprintf (dump_file,
+ "Not inlining: Function body no longer available.\n");
+ }
+ continue;
+ }
+ if (!tree_can_inline_p (node->decl, e->callee->decl))
{
- fprintf (dump_file, " Early inlining %s",
- cgraph_node_name (e->callee));
- fprintf (dump_file, " into %s\n", cgraph_node_name (node));
+ gimple_call_set_cannot_inline (e->call_stmt, true);
+ if (dump_file)
+ {
+ indent_to (dump_file, depth);
+ fprintf (dump_file,
+ "Not inlining: Target specific option mismatch.\n");
+ }
+ continue;
}
- cgraph_mark_inline (e);
- inlined = true;
+ if (cgraph_default_inline_p (e->callee, &failed_reason))
+ inlined |= try_inline (e, mode, depth);
}
+ node->aux = (void *)(size_t) old_mode;
+ return inlined;
+}
- /* 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)
- && (!early
- || (cgraph_estimate_size_after_inlining (1, e->caller, e->callee)
- <= e->caller->global.insns))
- && cgraph_check_inline_limits (node, e->callee, &e->inline_failed)
- && (DECL_SAVED_TREE (e->callee->decl) || e->callee->inline_decl))
- {
- if (cgraph_default_inline_p (e->callee, &failed_reason))
- {
- if (dump_file && early)
- {
- fprintf (dump_file, " Early inlining %s",
- cgraph_node_name (e->callee));
- fprintf (dump_file, " into %s\n", cgraph_node_name (node));
- }
- cgraph_mark_inline (e);
- inlined = true;
- }
- else if (!early)
- e->inline_failed = failed_reason;
- }
- if (early && inlined)
+/* Because inlining might remove no-longer reachable nodes, we need to
+ keep the array visible to garbage collector to avoid reading collected
+ out nodes. */
+static int nnodes;
+static GTY ((length ("nnodes"))) struct cgraph_node **order;
+
+/* Do inlining of small functions. Doing so early helps profiling and other
+ passes to be somewhat more effective and avoids some code duplication in
+ later real inlining pass for testcases with very many function calls. */
+static unsigned int
+cgraph_early_inlining (void)
+{
+ struct cgraph_node *node = cgraph_node (current_function_decl);
+ unsigned int todo = 0;
+
+ if (sorrycount || errorcount)
+ return 0;
+ if (cgraph_decide_inlining_incrementally (node, INLINE_SIZE, 0))
{
- push_cfun (DECL_STRUCT_FUNCTION (node->decl));
- tree_register_cfg_hooks ();
- current_function_decl = node->decl;
- optimize_inline_calls (current_function_decl);
- node->local.self_insns = node->global.insns;
- current_function_decl = NULL;
- pop_cfun ();
+ timevar_push (TV_INTEGRATION);
+ todo = optimize_inline_calls (current_function_decl);
+ timevar_pop (TV_INTEGRATION);
}
- return inlined;
+ cfun->always_inline_functions_inlined = true;
+ return todo;
}
/* When inlining shall be performed. */
static bool
-cgraph_gate_inlining (void)
+cgraph_gate_early_inlining (void)
{
- return flag_inline_trees;
+ return flag_early_inlining;
}
-struct tree_opt_pass pass_ipa_inline =
+struct gimple_opt_pass pass_early_inline =
{
- "inline", /* name */
- cgraph_gate_inlining, /* gate */
- cgraph_decide_inlining, /* execute */
+ {
+ GIMPLE_PASS,
+ "einline", /* name */
+ cgraph_gate_early_inlining, /* gate */
+ cgraph_early_inlining, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
- TV_INTEGRATION, /* tv_id */
+ TV_INLINE_HEURISTICS, /* tv_id */
0, /* properties_required */
PROP_cfg, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
- TODO_dump_cgraph | TODO_dump_func, /* todo_flags_finish */
- 0 /* letter */
+ TODO_dump_func /* todo_flags_finish */
+ }
};
-/* Do inlining of small functions. Doing so early helps profiling and other
- passes to be somewhat more effective and avoids some code duplication in
- later real inlining pass for testcases with very many function calls. */
+/* When inlining shall be performed. */
+static bool
+cgraph_gate_ipa_early_inlining (void)
+{
+ return (flag_early_inlining
+ && (flag_branch_probabilities || flag_test_coverage
+ || profile_arc_flag));
+}
+
+/* IPA pass wrapper for early inlining pass. We need to run early inlining
+ before tree profiling so we have stand alone IPA pass for doing so. */
+struct simple_ipa_opt_pass pass_ipa_early_inline =
+{
+ {
+ SIMPLE_IPA_PASS,
+ "einline_ipa", /* name */
+ cgraph_gate_ipa_early_inlining, /* gate */
+ NULL, /* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ TV_INLINE_HEURISTICS, /* tv_id */
+ 0, /* properties_required */
+ PROP_cfg, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ TODO_dump_cgraph /* todo_flags_finish */
+ }
+};
+
+/* Compute parameters of functions used by inliner. */
+unsigned int
+compute_inline_parameters (struct cgraph_node *node)
+{
+ HOST_WIDE_INT self_stack_size;
+
+ gcc_assert (!node->global.inlined_to);
+
+ /* Estimate the stack size for the function. But not at -O0
+ because estimated_stack_frame_size is a quadratic problem. */
+ self_stack_size = optimize ? estimated_stack_frame_size () : 0;
+ inline_summary (node)->estimated_self_stack_size = self_stack_size;
+ node->global.estimated_stack_size = self_stack_size;
+ node->global.stack_frame_offset = 0;
+
+ /* Can this function be inlined at all? */
+ node->local.inlinable = tree_inlinable_function_p (current_function_decl);
+
+ /* Estimate the number of instructions for this function.
+ ??? At -O0 we don't use this information except for the dumps, and
+ even then only for always_inline functions. But disabling this
+ causes ICEs in the inline heuristics... */
+ inline_summary (node)->self_insns
+ = estimate_num_insns_fn (current_function_decl, &eni_inlining_weights);
+ if (node->local.inlinable && !node->local.disregard_inline_limits)
+ node->local.disregard_inline_limits
+ = DECL_DISREGARD_INLINE_LIMITS (current_function_decl);
+
+ /* Inlining characteristics are maintained by the cgraph_mark_inline. */
+ node->global.insns = inline_summary (node)->self_insns;
+ return 0;
+}
+
+
+/* Compute parameters of functions used by inliner using
+ current_function_decl. */
static unsigned int
-cgraph_early_inlining (void)
+compute_inline_parameters_for_current (void)
+{
+ compute_inline_parameters (cgraph_node (current_function_decl));
+ return 0;
+}
+
+struct gimple_opt_pass pass_inline_parameters =
+{
+ {
+ GIMPLE_PASS,
+ NULL, /* name */
+ NULL, /* gate */
+ compute_inline_parameters_for_current,/* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ TV_INLINE_HEURISTICS, /* tv_id */
+ 0, /* properties_required */
+ PROP_cfg, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ 0 /* todo_flags_finish */
+ }
+};
+
+/* This function performs intraprocedural analyzis in NODE that is required to
+ inline indirect calls. */
+static void
+inline_indirect_intraprocedural_analysis (struct cgraph_node *node)
+{
+ struct cgraph_edge *cs;
+
+ if (!flag_ipa_cp)
+ {
+ ipa_initialize_node_params (node);
+ ipa_detect_param_modifications (node);
+ }
+ ipa_analyze_params_uses (node);
+
+ if (!flag_ipa_cp)
+ for (cs = node->callees; cs; cs = cs->next_callee)
+ {
+ ipa_count_arguments (cs);
+ ipa_compute_jump_functions (cs);
+ }
+
+ if (dump_file)
+ {
+ ipa_print_node_params (dump_file, node);
+ ipa_print_node_jump_functions (dump_file, node);
+ }
+}
+
+/* Note function body size. */
+static void
+analyze_function (struct cgraph_node *node)
+{
+ push_cfun (DECL_STRUCT_FUNCTION (node->decl));
+ current_function_decl = node->decl;
+
+ compute_inline_parameters (node);
+ if (flag_indirect_inlining)
+ inline_indirect_intraprocedural_analysis (node);
+
+ current_function_decl = NULL;
+ pop_cfun ();
+}
+
+/* Called when new function is inserted to callgraph late. */
+static void
+add_new_function (struct cgraph_node *node, void *data ATTRIBUTE_UNUSED)
+{
+ analyze_function (node);
+}
+
+/* Note function body size. */
+static void
+inline_generate_summary (void)
{
struct cgraph_node *node;
- int nnodes;
- struct cgraph_node **order =
- XCNEWVEC (struct cgraph_node *, cgraph_n_nodes);
- int i;
- if (sorrycount || errorcount)
- return 0;
-#ifdef ENABLE_CHECKING
- for (node = cgraph_nodes; node; node = node->next)
- gcc_assert (!node->aux);
-#endif
+ function_insertion_hook_holder =
+ cgraph_add_function_insertion_hook (&add_new_function, NULL);
- nnodes = cgraph_postorder (order);
- for (i = nnodes - 1; i >= 0; i--)
+ if (flag_indirect_inlining)
{
- node = order[i];
- if (node->analyzed && node->local.inlinable
- && (node->needed || node->reachable)
- && node->callers)
- {
- if (cgraph_decide_inlining_incrementally (node, true))
- ggc_collect ();
- }
+ ipa_register_cgraph_hooks ();
+ ipa_check_create_node_params ();
+ ipa_check_create_edge_args ();
}
- cgraph_remove_unreachable_nodes (true, dump_file);
-#ifdef ENABLE_CHECKING
+
for (node = cgraph_nodes; node; node = node->next)
- gcc_assert (!node->global.inlined_to);
-#endif
- free (order);
- return 0;
+ if (node->analyzed)
+ analyze_function (node);
+
+ return;
}
-/* When inlining shall be performed. */
-static bool
-cgraph_gate_early_inlining (void)
+/* Apply inline plan to function. */
+static unsigned int
+inline_transform (struct cgraph_node *node)
{
- return flag_inline_trees && flag_early_inlining;
+ unsigned int todo = 0;
+ struct cgraph_edge *e;
+
+ /* We might need the body of this function so that we can expand
+ it inline somewhere else. */
+ if (cgraph_preserve_function_body_p (node->decl))
+ save_inline_function_body (node);
+
+ for (e = node->callees; e; e = e->next_callee)
+ if (!e->inline_failed || warn_inline)
+ break;
+
+ if (e)
+ {
+ timevar_push (TV_INTEGRATION);
+ todo = optimize_inline_calls (current_function_decl);
+ timevar_pop (TV_INTEGRATION);
+ }
+ return todo | execute_fixup_cfg ();
}
-struct tree_opt_pass pass_early_ipa_inline =
+struct ipa_opt_pass pass_ipa_inline =
{
- "einline", /* name */
- cgraph_gate_early_inlining, /* gate */
- cgraph_early_inlining, /* execute */
+ {
+ IPA_PASS,
+ "inline", /* name */
+ NULL, /* gate */
+ cgraph_decide_inlining, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
- TV_INTEGRATION, /* tv_id */
+ TV_INLINE_HEURISTICS, /* tv_id */
0, /* properties_required */
PROP_cfg, /* properties_provided */
0, /* properties_destroyed */
- 0, /* todo_flags_start */
- TODO_dump_cgraph | TODO_dump_func, /* todo_flags_finish */
- 0 /* letter */
+ TODO_remove_functions, /* todo_flags_finish */
+ TODO_dump_cgraph | TODO_dump_func
+ | TODO_remove_functions /* todo_flags_finish */
+ },
+ inline_generate_summary, /* generate_summary */
+ NULL, /* write_summary */
+ NULL, /* read_summary */
+ NULL, /* function_read_summary */
+ 0, /* TODOs */
+ inline_transform, /* function_transform */
+ NULL, /* variable_transform */
};
+
+
+#include "gt-ipa-inline.h"
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