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tree-ssanames.c (release_dead_ssa_names): Compact the SSA version namespace as we release the freelist.

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2012-04-05  Richard Guenther  <rguenther@suse.de>

	* tree-ssanames.c (release_dead_ssa_names): Compact the SSA
	version namespace as we release the freelist.

From-SVN: r186162
This commit is contained in:
Richard Guenther 2012-04-05 11:30:52 +00:00 committed by Richard Biener
parent 0e74b5a21f
commit 14f60a5a37
2 changed files with 30 additions and 6 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2012-04-05 Richard Guenther <rguenther@suse.de>
* tree-ssanames.c (release_dead_ssa_names): Compact the SSA
version namespace as we release the freelist.
2012-04-05 Richard Guenther <rguenther@suse.de>
* tree-nrv.c (tree_nrv): Release VDEFs.

31
gcc/tree-ssanames.c
View File

@ -325,14 +325,14 @@ replace_ssa_name_symbol (tree ssa_name, tree sym)
TREE_TYPE (ssa_name) = TREE_TYPE (sym);
}
/* Return SSA names that are unused to GGC memory. This is used to keep
footprint of compiler during interprocedural optimization.
As a side effect the SSA_NAME_VERSION number reuse is reduced
so this function should not be used too often. */
/* Return SSA names that are unused to GGC memory and compact the SSA
version namespace. This is used to keep footprint of compiler during
interprocedural optimization. */
static unsigned int
release_dead_ssa_names (void)
{
tree t;
unsigned i, j;
int n = VEC_length (tree, FREE_SSANAMES (cfun));
referenced_var_iterator rvi;
@ -340,14 +340,33 @@ release_dead_ssa_names (void)
eventually dead variables so a bunch of memory is held live. */
FOR_EACH_REFERENCED_VAR (cfun, t, rvi)
set_current_def (t, NULL);
/* Now release the freelist. */
VEC_free (tree, gc, FREE_SSANAMES (cfun));
FREE_SSANAMES (cfun) = NULL;
/* And compact the SSA number space. We make sure to not change the
relative order of SSA versions. */
for (i = 1, j = 1; i < VEC_length (tree, cfun->gimple_df->ssa_names); ++i)
{
tree name = ssa_name (i);
if (name)
{
if (i != j)
{
SSA_NAME_VERSION (name) = j;
VEC_replace (tree, cfun->gimple_df->ssa_names, j, name);
}
j++;
}
}
VEC_truncate (tree, cfun->gimple_df->ssa_names, j);
statistics_counter_event (cfun, "SSA names released", n);
statistics_counter_event (cfun, "SSA name holes removed", i - j);
if (dump_file)
fprintf (dump_file, "Released %i names, %.2f%%\n",
n, n * 100.0 / num_ssa_names);
fprintf (dump_file, "Released %i names, %.2f%%, removed %i holes\n",
n, n * 100.0 / num_ssa_names, i - j);
return 0;
}