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ggc-page.c (ggc_alloc_stat): Use __builtin_ctzl instead of a loop to look for a free slot in a page entry.

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* ggc-page.c (ggc_alloc_stat): Use __builtin_ctzl instead of a
	loop to look for a free slot in a page entry.

From-SVN: r93738
This commit is contained in:
Steven Bosscher 2005-01-16 21:09:24 +00:00 • committed by Steven Bosscher
parent f53d3f9317
commit 6f0947e401
2 changed files with 11 additions and 0 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2005-01-16 Steven Bosscher <stevenb@suse.de>
* ggc-page.c (ggc_alloc_stat): Use __builtin_ctzl instead of a
loop to look for a free slot in a page entry.
2005-01-16 John David Anglin <dave.anglin@nrc-cnrc.gc.ca>
PR target/16304

6
gcc/ggc-page.c
View file

@ -1139,8 +1139,14 @@ ggc_alloc_stat (size_t size MEM_STAT_DECL)
word = bit = 0;
while (~entry->in_use_p[word] == 0)
++word;
#if GCC_VERSION >= 3004
bit = __builtin_ctzl (~entry->in_use_p[word]);
#else
while ((entry->in_use_p[word] >> bit) & 1)
++bit;
#endif
hint = word * HOST_BITS_PER_LONG + bit;
}