Re: [RFC][PATCH] Faster generic_fls

[Chuck Ebbert]

Peter Osterlund wrote:

>>   mov <mem1>,eax
>>   mov eax,<mem2>
>>   mov <mem1>,eax        ; eax already contains mem1 you stupid compiler
>>   ret
>
> Not necessarily if mem2 == mem1 + 2. Consider this code:

  I realized after sending that last that I should have added that there
were no volatiles and no aliasing possible.  This was the kernel code:

  return conf->last_used = new_disk;

(new_disk is a local variable, conf is a function arg.)

------
 Chuck