Re: [PATCH] optimize ia32 memmove

[Ed Sweetman <ed.sweetman@wmich.edu>]

Is this the entire patch?  When was the original post since I cant find 
the message going back over a month ago in the archives or any current 
posts.


Jeff Garzik wrote:
> Linux Kernel Mailing List wrote:
> 
>> ChangeSet 1.1496.22.32, 2003/12/29 21:45:30-08:00, akpm@osdl.org
>>
>>     [PATCH] optimize ia32 memmove
>>     
>>     From: Manfred Spraul <manfred@colorfullife.com>
>>     
>> diff -Nru a/include/asm-i386/string.h b/include/asm-i386/string.h
>> --- a/include/asm-i386/string.h    Mon Dec 29 23:13:20 2003
>> +++ b/include/asm-i386/string.h    Mon Dec 29 23:13:20 2003
>> @@ -299,14 +299,9 @@
>>  static inline void * memmove(void * dest,const void * src, size_t n)
>>  {
>>  int d0, d1, d2;
>> -if (dest<src)
>> -__asm__ __volatile__(
>> -    "rep\n\t"
>> -    "movsb"
>> -    : "=&c" (d0), "=&S" (d1), "=&D" (d2)
>> -    :"0" (n),"1" (src),"2" (dest)
>> -    : "memory");
>> -else
>> +if (dest<src) {
>> +    memcpy(dest,src,n);
>> +} else
>>  __asm__ __volatile__(
>>      "std\n\t"
>>      "rep\n\t"
>