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Optimize generic ELF hash function a bit more

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Ulrich Drepper
2011-12-10 11:53:44 -05:00
parent 850fb039ce
commit f039c04307
2 changed files with 9 additions and 1 deletions
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ChangeLog
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@@ -1,3 +1,8 @@
2011-12-10 Ulrich Drepper <drepper@gmail.com>
* sysdeps/generic/dl-hash.h (_dl_elf_hash): Lift one operation out of
the inner loop.
2011-12-06 Andreas Schwab <schwab@linux-m68k.org> 2011-12-06 Andreas Schwab <schwab@linux-m68k.org>
[BZ #13472] [BZ #13472]

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sysdeps/generic/dl-hash.h
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@@ -60,9 +60,12 @@ _dl_elf_hash (const char *name_arg)
But the following is equivalent and a lot But the following is equivalent and a lot
faster, especially on modern processors. */ faster, especially on modern processors. */
hash ^= hi;
hash ^= hi >> 24; hash ^= hi >> 24;
} }
/* Second part of the modified formula. This
operation can be lifted outside the loop. */
hash &= 0x0fffffff;
} }
} }
} }