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Avoid quadratic behaviour of LTO symbol promotion

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LTO partitioning does renaming of symbols that ends up in same partition
and clash with assembler name.  This is done for "ordinary" symbols (such
as static functions) but also for symbols that are kept only as master
clones holding bodies of functions to be specialized later.
This is done only becuase we stream bodies to named section and clash
in names would mean that ltrans will load wrong body and crash.

Martin recently added bit to stream body for clones that are needed
since this makes it easier to bookeep what summaries are output.  THis
however triggers mass renaming of inline clones that is very slow
and unnecesary since their bodies are never streamed.

Bootstrapped/regtested x86_64-linux, comitted.

gcc/lto/ChangeLog:

2023-01-04  Jan Hubicka  <hubicka@ucw.cz>

	* lto-partition.cc (may_need_named_section_p): Clones with no body
	need no remaning.
This commit is contained in:
Jan Hubicka 2023-01-04 18:03:53 +01:00
parent 96cba8ebe5
commit edc038863d
1 changed files with 5 additions and 2 deletions
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7
gcc/lto/lto-partition.cc
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@ -1035,15 +1035,18 @@ promote_symbol (symtab_node *node)
/* Return true if NODE needs named section even if it won't land in
the partition symbol table.
FIXME: we should really not use named sections for inline clones
and master clones. */
FIXME: we should really not use named sections for master clones. */
static bool
may_need_named_section_p (lto_symtab_encoder_t encoder, symtab_node *node)
{
struct cgraph_node *cnode = dyn_cast <cgraph_node *> (node);
/* We do not need to handle variables since we never clone them. */
if (!cnode)
return false;
/* Only master clones will have bodies streamed. */
if (cnode->clone_of)
return false;
if (node->real_symbol_p ())
return false;
return (!encoder