tech-kern archive

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]

Re: Make condition variables take absolute wakeup time

> These days, does hz >> 2 ever generate better code than hz / 4?

<kernel.h> says hz is signed, so, if shifts are faster than divides, I
would expect >>2 to be faster than /4.  If the hardware doesn't have a
signed-integer divide but does have shifts (eg, least common
denominator sparc32), >>2 should be smaller than /4 too.

/~\ The ASCII                           der Mouse
\ / Ribbon Campaign
 X  Against HTML     
/ \ Email!           7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B

Home | Main Index | Thread Index | Old Index