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ipa-prop.c (jump_function_useful_p): New.

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* ipa-prop.c (jump_function_useful_p): New.
	(ipa_read_node_info): Do not allocated useless jump functions.

From-SVN: r266799
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Jan Hubicka 2018-12-04 22:38:01 +01:00 committed by Jan Hubicka
parent 206d8779eb
commit 7b377b2210
2 changed files with 39 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2018-12-04 Jan Hubicka <hubicka@ucw.cz>
* ipa-prop.c (jump_function_useful_p): New.
(ipa_read_node_info): Do not allocated useless jump functions.
2018-12-04 David Malcolm <dmalcolm@redhat.com>
PR c/82967

34
gcc/ipa-prop.c
View File

@ -4344,6 +4344,26 @@ ipa_write_node_info (struct output_block *ob, struct cgraph_node *node)
}
}
/* If jump functions points to node we possibly can propagate into.
At this moment symbol table is still not merged, but the prevailing
symbol is always first in the list. */
static bool
jump_function_useful_p (symtab_node *node)
{
/* While incremental linking we may end up getting function body later. */
if (flag_incremental_link == INCREMENTAL_LINK_LTO)
return true;
if (!TREE_PUBLIC (node->decl) && !DECL_EXTERNAL (node->decl))
return true;
for (int n = 10; node->previous_sharing_asm_name && n ; n--)
node = node->previous_sharing_asm_name;
if (node->previous_sharing_asm_name)
node = symtab_node::get_for_asmname (DECL_ASSEMBLER_NAME (node->decl));
gcc_assert (TREE_PUBLIC (node->decl));
return node->definition;
}
/* Stream in NODE info from IB. */
static void
@ -4380,6 +4400,20 @@ ipa_read_node_info (struct lto_input_block *ib, struct cgraph_node *node,
if (!count)
continue;
if (!jump_function_useful_p (e->callee))
{
for (k = 0; k < count; k++)
{
struct ipa_jump_func dummy;
ipa_read_jump_function (ib, &dummy, e, data_in);
if (contexts_computed)
{
struct ipa_polymorphic_call_context ctx;
ctx.stream_in (ib, data_in);
}
}
continue;
}
vec_safe_grow_cleared (args->jump_functions, count);
if (contexts_computed)
vec_safe_grow_cleared (args->polymorphic_call_contexts, count);