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bitmap.h (bitmap_single_bit_set_p): Declare. 

2007-11-09  Richard Guenther  <rguenther@suse.de>

	* bitmap.h (bitmap_single_bit_set_p): Declare.
	* bitmap.c (bitmap_single_bit_set_p): New function.
	* tree-ssa-alias.c (add_may_alias_for_new_tag): Use it.
	(maybe_create_global_var): Use bitmap_empty_p.

From-SVN: r130045
This commit is contained in:
Richard Guenther 2007-11-09 14:01:33 +00:00 committed by Richard Biener
parent de26695057
commit 76e910c6b7
4 changed files with 47 additions and 2 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2007-11-09 Richard Guenther <rguenther@suse.de>
* bitmap.h (bitmap_single_bit_set_p): Declare.
* bitmap.c (bitmap_single_bit_set_p): New function.
* tree-ssa-alias.c (add_may_alias_for_new_tag): Use it.
(maybe_create_global_var): Use bitmap_empty_p.
2007-11-09 Paolo Bonzini <bonzini@gnu.org>
Jakub Jelinek <jakub@redhat.com>

34
gcc/bitmap.c
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@ -693,6 +693,40 @@ bitmap_count_bits (const_bitmap a)
return count;
}
/* Return true if the bitmap has a single bit set. Otherwise return
false. */
bool
bitmap_single_bit_set_p (const_bitmap a)
{
unsigned long count = 0;
const bitmap_element *elt;
unsigned ix;
if (bitmap_empty_p (a))
return false;
elt = a->first;
/* As there are no completely empty bitmap elements, a second one
means we have more than one bit set. */
if (elt->next != NULL)
return false;
for (ix = 0; ix != BITMAP_ELEMENT_WORDS; ix++)
{
#if GCC_VERSION >= 3400
/* Note that popcountl matches BITMAP_WORD in type, so the actual size
of BITMAP_WORD is not material. */
count += __builtin_popcountl (elt->bits[ix]);
#else
count += bitmap_popcount (elt->bits[ix]);
#endif
if (count > 1)
return false;
}
return count == 1;
}
/* Return the bit number of the first set bit in the bitmap. The

3
gcc/bitmap.h
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@ -107,6 +107,9 @@ extern bool bitmap_intersect_compl_p (const_bitmap, const_bitmap);
/* True if MAP is an empty bitmap. */
#define bitmap_empty_p(MAP) (!(MAP)->first)
/* True if the bitmap has only a single bit set. */
extern bool bitmap_single_bit_set_p (const_bitmap);
/* Count the number of bits set in the bitmap. */
extern unsigned long bitmap_count_bits (const_bitmap);

5
gcc/tree-ssa-alias.c
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@ -2780,7 +2780,7 @@ maybe_create_global_var (void)
So, if we have some pure/const and some regular calls in the
program we create .GLOBAL_VAR to avoid missing these
relations. */
if (bitmap_count_bits (gimple_call_clobbered_vars (cfun)) == 0
if (bitmap_empty_p (gimple_call_clobbered_vars (cfun))
&& stats->num_call_sites > 0
&& stats->num_pure_const_call_sites > 0
&& stats->num_call_sites > stats->num_pure_const_call_sites)
@ -3544,7 +3544,8 @@ add_may_alias_for_new_tag (tree tag, tree var)
aliases = may_aliases (var);
/* Case 1: |aliases| == 1 */
if (aliases && bitmap_count_bits (aliases) == 1)
if (aliases
&& bitmap_single_bit_set_p (aliases))
{
tree ali = referenced_var (bitmap_first_set_bit (aliases));
if (TREE_CODE (ali) == SYMBOL_MEMORY_TAG)