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ipa.c (cgraph_postorder): Adjust postorder to guarantee single-iteration always-inline inlining.

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2010-04-12  Richard Guenther  <rguenther@suse.de>

	* ipa.c (cgraph_postorder): Adjust postorder to guarantee
	single-iteration always-inline inlining.
	* ipa-inline.c (cgraph_mark_inline): Do not return anything.
	(cgraph_decide_inlining): Do not handle always-inline
	specially.
	(try_inline): Remove always-inline cycle detection special case.
	Do not recurse on always-inlines.
	(cgraph_early_inlining): Do not iterate if not optimizing.
	(cgraph_gate_early_inlining): remove.
	(pass_early_inline): Run unconditionally.
	(gate_cgraph_decide_inlining): New function.
	(pass_ipa_inline): Use it.  Do not run the IPA inliner if
	not inlining or optimizing.
	(cgraph_decide_inlining_of_small_functions): Also consider
	always-inline functions.
	(cgraph_default_inline_p): Return true for nodes which should
	disregard inline limits.
	(estimate_function_body_sizes): Assume zero size and time for
	nodes which are marked as disregarding inline limits.
	(cgraph_decide_recursive_inlining): Do not perform recursive
	inlining on always-inline nodes.

	* gcc.dg/torture/inline-2.c: New testcase.

From-SVN: r158225
This commit is contained in:
Richard Guenther 2010-04-12 13:37:32 +00:00 • committed by Richard Biener
parent fa8351f8d8
commit af961c7f46
5 changed files with 278 additions and 243 deletions
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24
gcc/ChangeLog
View file

@ -1,3 +1,27 @@
2010-04-12 Richard Guenther <rguenther@suse.de>
* ipa.c (cgraph_postorder): Adjust postorder to guarantee
single-iteration always-inline inlining.
* ipa-inline.c (cgraph_mark_inline): Do not return anything.
(cgraph_decide_inlining): Do not handle always-inline
specially.
(try_inline): Remove always-inline cycle detection special case.
Do not recurse on always-inlines.
(cgraph_early_inlining): Do not iterate if not optimizing.
(cgraph_gate_early_inlining): remove.
(pass_early_inline): Run unconditionally.
(gate_cgraph_decide_inlining): New function.
(pass_ipa_inline): Use it. Do not run the IPA inliner if
not inlining or optimizing.
(cgraph_decide_inlining_of_small_functions): Also consider
always-inline functions.
(cgraph_default_inline_p): Return true for nodes which should
disregard inline limits.
(estimate_function_body_sizes): Assume zero size and time for
nodes which are marked as disregarding inline limits.
(cgraph_decide_recursive_inlining): Do not perform recursive
inlining on always-inline nodes.
2010-04-12 Jakub Jelinek <jakub@redhat.com>
PR bootstrap/43699

452
gcc/ipa-inline.c
View file

@ -160,9 +160,10 @@ enum inlining_mode {
INLINE_SIZE,
INLINE_ALL
};
static bool
cgraph_decide_inlining_incrementally (struct cgraph_node *, enum inlining_mode,
int);
cgraph_decide_inlining_incrementally (struct cgraph_node *, enum inlining_mode);
static void cgraph_flatten (struct cgraph_node *node);
/* Statistics we collect about inlining algorithm. */
@ -346,11 +347,9 @@ cgraph_mark_inline_edge (struct cgraph_edge *e, bool update_original,
return false;
}
/* Mark all calls of EDGE->CALLEE inlined into EDGE->CALLER.
Return following unredirected edge in the list of callers
of EDGE->CALLEE */
/* Mark all calls of EDGE->CALLEE inlined into EDGE->CALLER. */
static struct cgraph_edge *
static void
cgraph_mark_inline (struct cgraph_edge *edge)
{
struct cgraph_node *to = edge->caller;
@ -370,8 +369,6 @@ cgraph_mark_inline (struct cgraph_edge *edge)
edge = next;
}
}
return edge;
}
/* Estimate the growth caused by inlining NODE into all callees. */
@ -479,6 +476,9 @@ cgraph_default_inline_p (struct cgraph_node *n, cgraph_inline_failed_t *reason)
{
tree decl = n->decl;
if (n->local.disregard_inline_limits)
return true;
if (!flag_inline_small_functions && !DECL_DECLARED_INLINE_P (decl))
{
if (reason)
@ -727,6 +727,12 @@ cgraph_decide_recursive_inlining (struct cgraph_node *node,
int depth = 0;
int n = 0;
/* It does not make sense to recursively inline always-inline functions
as we are going to sorry() on the remaining calls anyway. */
if (node->local.disregard_inline_limits
&& lookup_attribute ("always_inline", DECL_ATTRIBUTES (node->decl)))
return false;
if (optimize_function_for_size_p (DECL_STRUCT_FUNCTION (node->decl))
|| (!flag_inline_functions && !DECL_DECLARED_INLINE_P (node->decl)))
return false;
@ -916,8 +922,7 @@ cgraph_decide_inlining_of_small_functions (void)
for (node = cgraph_nodes; node; node = node->next)
{
if (!node->local.inlinable || !node->callers
|| node->local.disregard_inline_limits)
if (!node->local.inlinable || !node->callers)
continue;
if (dump_file)
fprintf (dump_file, "Considering inline candidate %s.\n", cgraph_node_name (node));
@ -1128,6 +1133,86 @@ cgraph_decide_inlining_of_small_functions (void)
BITMAP_FREE (updated_nodes);
}
/* Flatten NODE from the IPA inliner. */
static void
cgraph_flatten (struct cgraph_node *node)
{
struct cgraph_edge *e;
/* We shouldn't be called recursively when we are being processed. */
gcc_assert (node->aux == NULL);
node->aux = (void *)(size_t) INLINE_ALL;
for (e = node->callees; e; e = e->next_callee)
{
struct cgraph_node *orig_callee;
if (e->call_stmt_cannot_inline_p)
continue;
if (!e->callee->analyzed)
{
if (dump_file)
fprintf (dump_file,
"Not inlining: Function body not available.\n");
continue;
}
/* We've hit cycle? It is time to give up. */
if (e->callee->aux)
{
if (dump_file)
fprintf (dump_file,
"Not inlining %s into %s to avoid cycle.\n",
cgraph_node_name (e->callee),
cgraph_node_name (e->caller));
e->inline_failed = CIF_RECURSIVE_INLINING;
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)
{
cgraph_flatten (e->callee);
continue;
}
if (cgraph_recursive_inlining_p (node, e->callee, &e->inline_failed))
{
if (dump_file)
fprintf (dump_file, "Not inlining: recursive call.\n");
continue;
}
if (!tree_can_inline_p (e))
{
if (dump_file)
fprintf (dump_file, "Not inlining: %s",
cgraph_inline_failed_string (e->inline_failed));
continue;
}
/* Inline the edge and flatten the inline clone. Avoid
recursing through the original node if the node was cloned. */
if (dump_file)
fprintf (dump_file, " Inlining %s into %s.\n",
cgraph_node_name (e->callee),
cgraph_node_name (e->caller));
orig_callee = e->callee;
cgraph_mark_inline_edge (e, true, NULL);
if (e->callee != orig_callee)
orig_callee->aux = (void *)(size_t) INLINE_ALL;
cgraph_flatten (e->callee);
if (e->callee != orig_callee)
orig_callee->aux = NULL;
}
node->aux = NULL;
}
/* Decide on the inlining. We do so in the topological order to avoid
expenses on updating data structures. */
@ -1140,7 +1225,6 @@ cgraph_decide_inlining (void)
XCNEWVEC (struct cgraph_node *, cgraph_n_nodes);
int old_size = 0;
int i;
bool redo_always_inline = true;
int initial_size = 0;
cgraph_remove_function_insertion_hook (function_insertion_hook_holder);
@ -1178,65 +1262,29 @@ cgraph_decide_inlining (void)
node->aux = 0;
if (dump_file)
fprintf (dump_file, "\nInlining always_inline functions:\n");
fprintf (dump_file, "\nFlattening 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. */
while (redo_always_inline)
/* In the first pass handle functions to be flattened. Do this with
a priority so none of our later choices will make this impossible. */
for (i = nnodes - 1; i >= 0; i--)
{
redo_always_inline = false;
for (i = nnodes - 1; i >= 0; i--)
node = order[i];
/* Handle nodes to be flattened, but don't update overall unit
size. Calling the incremental inliner here is lame,
a simple worklist should be enough. What should be left
here from the early inliner (if it runs) is cyclic cases.
Ideally when processing callees we stop inlining at the
entry of cycles, possibly cloning that entry point and
try to flatten itself turning it into a self-recursive
function. */
if (lookup_attribute ("flatten",
DECL_ATTRIBUTES (node->decl)) != NULL)
{
struct cgraph_edge *e, *next;
node = order[i];
/* 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 size:%i (always inline)\n",
cgraph_node_name (node), node->global.size);
old_size = overall_size;
for (e = node->callers; e; e = next)
{
next = e->next_caller;
if (!e->inline_failed || e->call_stmt_cannot_inline_p)
continue;
if (cgraph_recursive_inlining_p (e->caller, e->callee,
&e->inline_failed))
continue;
if (!tree_can_inline_p (e))
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 size %i.\n",
cgraph_node_name (e->caller),
e->caller->global.size);
}
/* 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 = CIF_RECURSIVE_INLINING;
if (dump_file)
fprintf (dump_file,
" Inlined for a net change of %+i size.\n",
overall_size - old_size);
"Flattening %s\n", cgraph_node_name (node));
cgraph_flatten (node);
}
}
@ -1313,86 +1361,6 @@ cgraph_decide_inlining (void)
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;
bool inlined = false;
/* 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
? CIF_RECURSIVE_INLINING : CIF_UNSPECIFIED);
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);
inlined = true;
}
callee->aux = (void *)(size_t) callee_mode;
return inlined;
}
/* Return true when N is leaf function. Accept cheap (pure&const) builtins
in leaf functions. */
static bool
@ -1408,38 +1376,29 @@ leaf_node_p (struct cgraph_node *n)
}
/* Decide on the inlining. We do so in the topological order to avoid
expenses on updating data structures.
DEPTH is depth of recursion, used only for debug output. */
expenses on updating data structures. */
static bool
cgraph_decide_inlining_incrementally (struct cgraph_node *node,
enum inlining_mode mode,
int depth)
enum inlining_mode mode)
{
struct cgraph_edge *e;
bool inlined = false;
cgraph_inline_failed_t 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 && mode != INLINE_SIZE_NORECURSIVE
&& 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));
}
fprintf (dump_file, "Incrementally flattening %s\n",
cgraph_node_name (node));
mode = INLINE_ALL;
}
node->aux = (void *)(size_t) mode;
/* First of all look for always inline functions. */
if (mode != INLINE_SIZE_NORECURSIVE)
for (e = node->callees; e; e = e->next_callee)
@ -1449,61 +1408,45 @@ cgraph_decide_inlining_incrementally (struct cgraph_node *node,
continue;
if (e->call_stmt_cannot_inline_p)
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));
}
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");
}
fprintf (dump_file, "Not inlining: recursive call.\n");
continue;
}
if (!tree_can_inline_p (e))
{
if (dump_file)
{
indent_to (dump_file, depth);
fprintf (dump_file,
"Not inlining: %s",
cgraph_inline_failed_string (e->inline_failed));
}
fprintf (dump_file,
"Not inlining: %s",
cgraph_inline_failed_string (e->inline_failed));
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");
}
fprintf (dump_file, "Not inlining: SSA form does not match.\n");
continue;
}
if (!e->callee->analyzed)
{
if (dump_file)
{
indent_to (dump_file, depth);
fprintf (dump_file,
"Not inlining: Function body no longer available.\n");
}
fprintf (dump_file,
"Not inlining: Function body no longer available.\n");
continue;
}
inlined |= try_inline (e, mode, depth);
if (dump_file)
fprintf (dump_file, " Inlining %s into %s.\n",
cgraph_node_name (e->callee),
cgraph_node_name (e->caller));
cgraph_mark_inline (e);
inlined = true;
}
/* Now do the automatic inlining. */
@ -1530,21 +1473,15 @@ cgraph_decide_inlining_incrementally (struct cgraph_node *node,
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");
}
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");
}
fprintf (dump_file,
"Not inlining: SSA form does not match.\n");
continue;
}
@ -1563,14 +1500,11 @@ cgraph_decide_inlining_incrementally (struct cgraph_node *node,
&& cgraph_estimate_growth (e->callee) > allowed_growth)
{
if (dump_file)
{
indent_to (dump_file, depth);
fprintf (dump_file,
"Not inlining: code size would grow by %i.\n",
cgraph_estimate_size_after_inlining (1, e->caller,
e->callee)
- e->caller->global.size);
}
fprintf (dump_file,
"Not inlining: code size would grow by %i.\n",
cgraph_estimate_size_after_inlining (1, e->caller,
e->callee)
- e->caller->global.size);
continue;
}
if (!cgraph_check_inline_limits (node, e->callee, &e->inline_failed,
@ -1578,40 +1512,37 @@ cgraph_decide_inlining_incrementally (struct cgraph_node *node,
|| e->call_stmt_cannot_inline_p)
{
if (dump_file)
{
indent_to (dump_file, depth);
fprintf (dump_file, "Not inlining: %s.\n",
cgraph_inline_failed_string (e->inline_failed));
}
fprintf (dump_file, "Not inlining: %s.\n",
cgraph_inline_failed_string (e->inline_failed));
continue;
}
if (!e->callee->analyzed)
{
if (dump_file)
{
indent_to (dump_file, depth);
fprintf (dump_file,
"Not inlining: Function body no longer available.\n");
}
fprintf (dump_file,
"Not inlining: Function body no longer available.\n");
continue;
}
if (!tree_can_inline_p (e))
{
if (dump_file)
{
indent_to (dump_file, depth);
fprintf (dump_file,
"Not inlining: %s.",
cgraph_inline_failed_string (e->inline_failed));
}
fprintf (dump_file,
"Not inlining: %s.",
cgraph_inline_failed_string (e->inline_failed));
continue;
}
if (cgraph_default_inline_p (e->callee, &failed_reason))
inlined |= try_inline (e, mode, depth);
{
if (dump_file)
fprintf (dump_file, " Inlining %s into %s.\n",
cgraph_node_name (e->callee),
cgraph_node_name (e->caller));
cgraph_mark_inline (e);
inlined = true;
}
}
BITMAP_FREE (visited);
}
node->aux = (void *)(size_t) old_mode;
return inlined;
}
@ -1633,27 +1564,40 @@ cgraph_early_inlining (void)
if (sorrycount || errorcount)
return 0;
while (iterations < PARAM_VALUE (PARAM_EARLY_INLINER_MAX_ITERATIONS)
&& cgraph_decide_inlining_incrementally (node,
iterations
? INLINE_SIZE_NORECURSIVE : INLINE_SIZE, 0))
if (!optimize
|| flag_no_inline
|| !flag_early_inlining)
{
/* When not optimizing or not inlining inline only always-inline
functions. */
cgraph_decide_inlining_incrementally (node, INLINE_ALWAYS_INLINE);
timevar_push (TV_INTEGRATION);
todo |= optimize_inline_calls (current_function_decl);
iterations++;
timevar_pop (TV_INTEGRATION);
}
if (dump_file)
fprintf (dump_file, "Iterations: %i\n", iterations);
cfun->always_inline_functions_inlined = true;
return todo;
}
else
{
/* We iterate incremental inlining to get trivial cases of indirect
inlining. */
while (iterations < PARAM_VALUE (PARAM_EARLY_INLINER_MAX_ITERATIONS)
&& cgraph_decide_inlining_incrementally (node,
iterations
? INLINE_SIZE_NORECURSIVE
: INLINE_SIZE))
{
timevar_push (TV_INTEGRATION);
todo |= optimize_inline_calls (current_function_decl);
iterations++;
timevar_pop (TV_INTEGRATION);
}
if (dump_file)
fprintf (dump_file, "Iterations: %i\n", iterations);
}
/* When inlining shall be performed. */
static bool
cgraph_gate_early_inlining (void)
{
return flag_early_inlining;
cfun->always_inline_functions_inlined = true;
return todo;
}
struct gimple_opt_pass pass_early_inline =
@ -1661,7 +1605,7 @@ struct gimple_opt_pass pass_early_inline =
{
GIMPLE_PASS,
"einline", /* name */
cgraph_gate_early_inlining, /* gate */
NULL, /* gate */
cgraph_early_inlining, /* execute */
NULL, /* sub */
NULL, /* next */
@ -1786,6 +1730,14 @@ estimate_function_body_sizes (struct cgraph_node *node)
int freq;
tree funtype = TREE_TYPE (node->decl);
if (node->local.disregard_inline_limits)
{
inline_summary (node)->self_time = 0;
inline_summary (node)->self_size = 0;
inline_summary (node)->time_inlining_benefit = 0;
inline_summary (node)->size_inlining_benefit = 0;
}
if (dump_file)
fprintf (dump_file, "Analyzing function body size: %s\n",
cgraph_node_name (node));
@ -2045,12 +1997,26 @@ inline_write_summary (cgraph_node_set set)
ipa_prop_write_jump_functions (set);
}
/* When to run IPA inlining. Inlining of always-inline functions
happens during early inlining. */
static bool
gate_cgraph_decide_inlining (void)
{
/* ??? We'd like to skip this if not optimizing or not inlining as
all always-inline functions have been processed by early
inlining already. But this at least breaks EH with C++ as
we need to unconditionally run fixup_cfg even at -O0.
So leave it on unconditionally for now. */
return 1;
}
struct ipa_opt_pass_d pass_ipa_inline =
{
{
IPA_PASS,
"inline", /* name */
NULL, /* gate */
gate_cgraph_decide_inlining, /* gate */
cgraph_decide_inlining, /* execute */
NULL, /* sub */
NULL, /* next */

6
gcc/ipa.c
View file

@ -70,6 +70,12 @@ cgraph_postorder (struct cgraph_node **order)
node2->aux = edge->next_caller;
else
node2->aux = &last;
/* Break possible cycles involving always-inline
functions by ignoring edges from always-inline
functions to non-always-inline functions. */
if (edge->caller->local.disregard_inline_limits
&& !edge->callee->local.disregard_inline_limits)
continue;
if (!edge->caller->aux)
{
if (!edge->caller->callers)

4
gcc/testsuite/ChangeLog
View file

@ -1,3 +1,7 @@
2010-04-12 Richard Guenther <rguenther@suse.de>
* gcc.dg/torture/inline-2.c: New testcase.
2010-04-12 Jakub Jelinek <jakub@redhat.com>
PR bootstrap/43699

35
gcc/testsuite/gcc.dg/torture/inline-2.c Normal file
View file

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/* { dg-do link } */
extern inline void foo2 (void) __attribute__((always_inline,gnu_inline));
extern inline void foo1 (void) __attribute__((always_inline,gnu_inline));
void bar1 (void);
void bar2 (void);
extern inline void __attribute__((always_inline,gnu_inline))
foo2 (void)
{
bar2 ();
}
void
bar1 (void)
{
foo2 ();
}
void
bar2 (void)
{
foo1 ();
}
extern inline void __attribute__((always_inline,gnu_inline))
foo1 (void)
{
bar1 ();
}
int main()
{
return 0;
}