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GNU C Library master sources branch, master, updated. glibc-2.14-549-gf039c04
- From: drepper at sourceware dot org
- To: glibc-cvs at sourceware dot org
- Date: 10 Dec 2011 16:54:04 -0000
- Subject: GNU C Library master sources branch, master, updated. glibc-2.14-549-gf039c04
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http://sources.redhat.com/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=f039c043071f2f55943d052fa7d4ad5f1a67db09
commit f039c043071f2f55943d052fa7d4ad5f1a67db09
Author: Ulrich Drepper <drepper@gmail.com>
Date: Sat Dec 10 11:53:44 2011 -0500
Optimize generic ELF hash function a bit more
diff --git a/ChangeLog b/ChangeLog
index 73e9911..93adebd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -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>
[BZ #13472]
diff --git a/sysdeps/generic/dl-hash.h b/sysdeps/generic/dl-hash.h
index 28312ca..e0db00e 100644
--- a/sysdeps/generic/dl-hash.h
+++ b/sysdeps/generic/dl-hash.h
@@ -60,9 +60,12 @@ _dl_elf_hash (const char *name_arg)
But the following is equivalent and a lot
faster, especially on modern processors. */
- hash ^= hi;
hash ^= hi >> 24;
}
+
+ /* Second part of the modified formula. This
+ operation can be lifted outside the loop. */
+ hash &= 0x0fffffff;
}
}
}
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 5 +++++
sysdeps/generic/dl-hash.h | 5 ++++-
2 files changed, 9 insertions(+), 1 deletions(-)
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