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| author | Alexey Dobriyan <adobriyan@gmail.com> | 2011-12-11 22:13:19 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-12-12 21:33:42 +0400 |
| commit | 890890cb8e415e1e7a61bfe3c8e246f710196824 (patch) | |
| tree | a4694f6470484ebac1d82ed317fa5ce5c198006e /arch/x86/lib | |
| parent | 79f1ddd06471b094ae30eb17b33beb9f1234ca93 (diff) | |
| download | linux-890890cb8e415e1e7a61bfe3c8e246f710196824.tar.xz | |
x86/i386: Use less assembly in strlen(), speed things up a bit
Current i386 strlen() hardcodes NOT/DEC sequence. DEC is
mentioned to be suboptimal on Core2. So, put only REPNE SCASB
sequence in assembly, compiler can do the rest.
The difference in generated code is like below (MCORE2=y):
<strlen>:
push %edi
mov $0xffffffff,%ecx
mov %eax,%edi
xor %eax,%eax
repnz scas %es:(%edi),%al
not %ecx
- dec %ecx
- mov %ecx,%eax
+ lea -0x1(%ecx),%eax
pop %edi
ret
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Jan Beulich <JBeulich@suse.com>
Link: http://lkml.kernel.org/r/20111211181319.GA17097@p183.telecom.by
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/lib')
| -rw-r--r-- | arch/x86/lib/string_32.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/arch/x86/lib/string_32.c b/arch/x86/lib/string_32.c index 82004d2bf05e..bd59090825db 100644 --- a/arch/x86/lib/string_32.c +++ b/arch/x86/lib/string_32.c @@ -164,15 +164,13 @@ EXPORT_SYMBOL(strchr); size_t strlen(const char *s) { int d0; - int res; + size_t res; asm volatile("repne\n\t" - "scasb\n\t" - "notl %0\n\t" - "decl %0" + "scasb" : "=c" (res), "=&D" (d0) : "1" (s), "a" (0), "0" (0xffffffffu) : "memory"); - return res; + return ~res - 1; } EXPORT_SYMBOL(strlen); #endif |