-/* Callgraph based intraprocedural optimizations.
+/* Callgraph based interprocedural optimizations.
Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
Contributed by Jan Hubicka
02110-1301, USA. */
/* This module implements main driver of compilation process as well as
- few basic intraprocedural optimizers.
+ few basic interprocedural optimizers.
The main scope of this file is to act as an interface in between
tree based frontends and the backend (and middle end)
static void cgraph_expand_function (struct cgraph_node *);
static tree record_reference (tree *, int *, void *);
static void cgraph_output_pending_asms (void);
+static void cgraph_increase_alignment (void);
+
+/* Lists all assembled variables to be sent to debugger output later on. */
+static GTY(()) struct cgraph_varpool_node *cgraph_varpool_assembled_nodes_queue;
/* Records tree nodes seen in record_reference. Simply using
walk_tree_without_duplicates doesn't guarantee each node is visited
}
/* If the user told us it is used, then it must be so. */
- if (node->local.externally_visible
- || lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
+ if (node->local.externally_visible)
+ return true;
+
+ if (!flag_unit_at_a_time && lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
return true;
/* ??? If the assembler name is set by hand, it is possible to assemble
COMDAT functions that must be output only when they are needed.
When not optimizing, also output the static functions. (see
- PR25962), but don't do so for always_inline functions, functions
+ PR24561), but don't do so for always_inline functions, functions
declared inline and nested functions. These was optimized out
in the original implementation and it is unclear whether we want
- to change the behaviour here. */
+ to change the behavior here. */
if (((TREE_PUBLIC (decl)
|| (!optimize && !node->local.disregard_inline_limits
&& !DECL_DECLARED_INLINE_P (decl)
cgraph_varpool_first_unanalyzed_node = cgraph_varpool_first_unanalyzed_node->next_needed;
+ /* Compute the alignment early so function body expanders are
+ already informed about increased alignment. */
+ align_variable (decl, 0);
+
if (DECL_INITIAL (decl))
{
visited_nodes = pointer_set_create ();
if (!flag_unit_at_a_time)
{
- struct cgraph_node *n;
+ struct cgraph_node *n, *next;
- for (n = cgraph_nodes; n; n = n->next)
- if (n->global.inlined_to == node)
- cgraph_remove_node (n);
+ for (n = cgraph_nodes; n; n = next)
+ {
+ next = n->next;
+ if (n->global.inlined_to == node)
+ cgraph_remove_node (n);
+ }
}
cgraph_node_remove_callees (node);
&& (TREE_CODE (decl) != VAR_DECL || !DECL_HAS_VALUE_EXPR_P (decl)))
{
assemble_variable (decl, 0, 1, 0);
- /* Local static variables are never seen by check_global_declarations
- so we need to output debug info by hand. */
- if (DECL_CONTEXT (decl)
- && (TREE_CODE (DECL_CONTEXT (decl)) == BLOCK
- || TREE_CODE (DECL_CONTEXT (decl)) == FUNCTION_DECL)
- && errorcount == 0 && sorrycount == 0)
- {
- timevar_push (TV_SYMOUT);
- (*debug_hooks->global_decl) (decl);
- timevar_pop (TV_SYMOUT);
- }
- return true;
+ return TREE_ASM_WRITTEN (decl);
}
return false;
cgraph_varpool_nodes_queue = cgraph_varpool_nodes_queue->next_needed;
if (cgraph_varpool_assemble_decl (node))
- changed = true;
- node->next_needed = NULL;
+ {
+ changed = true;
+ node->next_needed = cgraph_varpool_assembled_nodes_queue;
+ cgraph_varpool_assembled_nodes_queue = node;
+ node->finalized = 1;
+ }
+ else
+ node->next_needed = NULL;
}
return changed;
}
+/* Output all variables enqueued to be assembled. */
+static void
+cgraph_varpool_output_debug_info (void)
+{
+ timevar_push (TV_SYMOUT);
+ if (errorcount == 0 && sorrycount == 0)
+ while (cgraph_varpool_assembled_nodes_queue)
+ {
+ struct cgraph_varpool_node *node = cgraph_varpool_assembled_nodes_queue;
+
+ /* Local static variables are never seen by check_global_declarations
+ so we need to output debug info by hand. */
+ if (DECL_CONTEXT (node->decl)
+ && (TREE_CODE (DECL_CONTEXT (node->decl)) == BLOCK
+ || TREE_CODE (DECL_CONTEXT (node->decl)) == FUNCTION_DECL)
+ && errorcount == 0 && sorrycount == 0)
+ (*debug_hooks->global_decl) (node->decl);
+ cgraph_varpool_assembled_nodes_queue = node->next_needed;
+ node->next_needed = 0;
+ }
+ timevar_pop (TV_SYMOUT);
+}
/* Output all asm statements we have stored up to be output. */
cgraph_create_edges (node, decl);
node->local.inlinable = tree_inlinable_function_p (decl);
- node->local.self_insns = estimate_num_insns (decl);
+ if (!flag_unit_at_a_time)
+ node->local.self_insns = estimate_num_insns (decl);
if (node->local.inlinable)
node->local.disregard_inline_limits
= lang_hooks.tree_inlining.disregard_inline_limits (decl);
current_function_decl = NULL;
}
+/* Look for externally_visible and used attributes and mark cgraph nodes
+ accordingly.
+
+ We cannot mark the nodes at the point the attributes are processed (in
+ handle_*_attribute) because the copy of the declarations available at that
+ point may not be canonical. For example, in:
+
+ void f();
+ void f() __attribute__((used));
+
+ the declaration we see in handle_used_attribute will be the second
+ declaration -- but the front end will subsequently merge that declaration
+ with the original declaration and discard the second declaration.
+
+ Furthermore, we can't mark these nodes in cgraph_finalize_function because:
+
+ void f() {}
+ void f() __attribute__((externally_visible));
+
+ is valid.
+
+ So, we walk the nodes at the end of the translation unit, applying the
+ attributes at that point. */
+
+static void
+process_function_and_variable_attributes (struct cgraph_node *first,
+ struct cgraph_varpool_node *first_var)
+{
+ struct cgraph_node *node;
+ struct cgraph_varpool_node *vnode;
+
+ for (node = cgraph_nodes; node != first; node = node->next)
+ {
+ tree decl = node->decl;
+ if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
+ {
+ mark_decl_referenced (decl);
+ if (node->local.finalized)
+ cgraph_mark_needed_node (node);
+ }
+ if (lookup_attribute ("externally_visible", DECL_ATTRIBUTES (decl)))
+ {
+ if (! TREE_PUBLIC (node->decl))
+ warning (OPT_Wattributes,
+ "%J%<externally_visible%> attribute have effect only on public objects",
+ node->decl);
+ else
+ {
+ if (node->local.finalized)
+ cgraph_mark_needed_node (node);
+ node->local.externally_visible = true;
+ }
+ }
+ }
+ for (vnode = cgraph_varpool_nodes; vnode != first_var; vnode = vnode->next)
+ {
+ tree decl = vnode->decl;
+ if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
+ {
+ mark_decl_referenced (decl);
+ if (vnode->finalized)
+ cgraph_varpool_mark_needed_node (vnode);
+ }
+ if (lookup_attribute ("externally_visible", DECL_ATTRIBUTES (decl)))
+ {
+ if (! TREE_PUBLIC (vnode->decl))
+ warning (OPT_Wattributes,
+ "%J%<externally_visible%> attribute have effect only on public objects",
+ vnode->decl);
+ else
+ {
+ if (vnode->finalized)
+ cgraph_varpool_mark_needed_node (vnode);
+ vnode->externally_visible = true;
+ }
+ }
+ }
+}
+
/* Analyze the whole compilation unit once it is parsed completely. */
void
cgraph_finalize_compilation_unit (void)
{
- struct cgraph_node *node;
+ struct cgraph_node *node, *next;
/* Keep track of already processed nodes when called multiple times for
intermodule optimization. */
static struct cgraph_node *first_analyzed;
+ static struct cgraph_varpool_node *first_analyzed_var;
+
+ if (errorcount || sorrycount)
+ return;
finish_aliases_1 ();
{
cgraph_output_pending_asms ();
cgraph_assemble_pending_functions ();
+ cgraph_varpool_output_debug_info ();
return;
}
}
timevar_push (TV_CGRAPH);
+ process_function_and_variable_attributes (first_analyzed, first_analyzed_var);
cgraph_varpool_analyze_pending_decls ();
if (cgraph_dump_file)
{
if (cgraph_dump_file)
fprintf (cgraph_dump_file, "\nReclaiming functions:");
- for (node = cgraph_nodes; node != first_analyzed; node = node->next)
+ for (node = cgraph_nodes; node != first_analyzed; node = next)
{
tree decl = node->decl;
+ next = node->next;
if (node->local.finalized && !DECL_SAVED_TREE (decl))
cgraph_reset_node (node);
dump_cgraph (cgraph_dump_file);
}
first_analyzed = cgraph_nodes;
+ first_analyzed_var = cgraph_varpool_nodes;
ggc_collect ();
timevar_pop (TV_CGRAPH);
}
void
cgraph_optimize (void)
{
+ if (errorcount || sorrycount)
+ return;
+
#ifdef ENABLE_CHECKING
verify_cgraph ();
#endif
{
cgraph_output_pending_asms ();
cgraph_varpool_assemble_pending_decls ();
+ cgraph_varpool_output_debug_info ();
return;
}
timevar_push (TV_CGRAPHOPT);
if (!quiet_flag)
- fprintf (stderr, "Performing intraprocedural optimizations\n");
+ fprintf (stderr, "Performing interprocedural optimizations\n");
cgraph_function_and_variable_visibility ();
if (cgraph_dump_file)
/* This pass remove bodies of extern inline functions we never inlined.
Do this later so other IPA passes see what is really going on. */
cgraph_remove_unreachable_nodes (false, dump_file);
+ cgraph_increase_alignment ();
cgraph_global_info_ready = true;
if (cgraph_dump_file)
{
cgraph_varpool_remove_unreferenced_decls ();
cgraph_varpool_assemble_pending_decls ();
+ cgraph_varpool_output_debug_info ();
}
if (cgraph_dump_file)
/* Double check that all inline clones are gone and that all
function bodies have been released from memory. */
if (flag_unit_at_a_time
- && !dump_enabled_p (TDI_tree_all)
&& !(sorrycount || errorcount))
{
struct cgraph_node *node;
#endif
}
+/* Increase alignment of global arrays to improve vectorization potential.
+ TODO:
+ - Consider also structs that have an array field.
+ - Use ipa analysis to prune arrays that can't be vectorized?
+ This should involve global alignment analysis and in the future also
+ array padding. */
+
+static void
+cgraph_increase_alignment (void)
+{
+ if (flag_section_anchors && flag_tree_vectorize)
+ {
+ struct cgraph_varpool_node *vnode;
+
+ /* Increase the alignment of all global arrays for vectorization. */
+ for (vnode = cgraph_varpool_nodes_queue;
+ vnode;
+ vnode = vnode->next_needed)
+ {
+ tree vectype, decl = vnode->decl;
+ unsigned int alignment;
+
+ if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
+ continue;
+ vectype = get_vectype_for_scalar_type (TREE_TYPE (TREE_TYPE (decl)));
+ if (!vectype)
+ continue;
+ alignment = TYPE_ALIGN (vectype);
+ if (DECL_ALIGN (decl) >= alignment)
+ continue;
+
+ if (vect_can_force_dr_alignment_p (decl, alignment))
+ {
+ DECL_ALIGN (decl) = TYPE_ALIGN (vectype);
+ DECL_USER_ALIGN (decl) = 1;
+ if (cgraph_dump_file)
+ {
+ fprintf (cgraph_dump_file, "Increasing alignment of decl: ");
+ print_generic_expr (cgraph_dump_file, decl, TDF_SLIM);
+ }
+ }
+ }
+ }
+}
+
/* Generate and emit a static constructor or destructor. WHICH must be
one of 'I' or 'D'. BODY should be a STATEMENT_LIST containing
GENERIC statements. */
return first_clone;
}
+#include "gt-cgraphunit.h"
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