| commit | d74beb9f33a5f16d2965f11b275e401f225c949d | |
| author | Eric Dumazet <dada1@cosmosbay.com> | |
| Sat, 25 Mar 2006 11:08:19 +0000 (25 03:08 -0800) | ||
| committer | Linus Torvalds <torvalds@g5.osdl.org> | |
| Sat, 25 Mar 2006 16:23:01 +0000 (25 08:23 -0800) | ||
| tree | 48f851753ebe9c9c8dd701dcdd0c5e1d7c629579 | treesnapshot (tar.gz zip) |
| parent | 34f361ade2fb4a869f6a7714d01c04ce4cfa75d9 | commitdiff |
[PATCH] Use unsigned int types for a faster bsearch
This patch avoids arithmetic on 'signed' types that are slower than
'unsigned'. This saves space and cpu cycles.
size of kernel/sys.o before the patch (gcc-3.4.5)
text data bss dec hex filename
10924 252 4 11180 2bac kernel/sys.o
size of kernel/sys.o after the patch
text data bss dec hex filename
10903 252 4 11159 2b97 kernel/sys.o
I noticed that gcc-4.1.0 (from Fedora Core 5) even uses idiv instruction for
(a+b)/2 if a and b are signed.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This patch avoids arithmetic on 'signed' types that are slower than
'unsigned'. This saves space and cpu cycles.
size of kernel/sys.o before the patch (gcc-3.4.5)
text data bss dec hex filename
10924 252 4 11180 2bac kernel/sys.o
size of kernel/sys.o after the patch
text data bss dec hex filename
10903 252 4 11159 2b97 kernel/sys.o
I noticed that gcc-4.1.0 (from Fedora Core 5) even uses idiv instruction for
(a+b)/2 if a and b are signed.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| kernel/sys.c | diffblobblamehistory |