[boost] Re: shared_ptr on ppc?

From: Alexander Terekhov (terekhov_at_[hidden])
Date: 2005-04-06 10:50:47

Peter Dimov wrote:
[...]
> we'll probably see a bigger hit on a dual PPC.

Try on it something along the lines of 

  asm long atomic_decrement_weak( register long * pw ) {

      <load-UNreserved>
      <add -1>
      <branch if zero to acquire>
      {lw}sync

    loop:

      <load-reserved>
      <add -1>
      <branch if zero to acquire>
      <store-conditional>
      <branch if failed to loop else to done>

    acquire:

      isync

    done:

      <...>
  }

regards,
alexander.