[boost] Re: shared_ptr on ppc?

6 Apr 2005

      Alexander Terekhov wrote:
...
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:
<...>
  }
and 

 asm long atomic_decrement_strong( register long * pw ) {

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

    loop:

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

    acquire:

      <store-conditional>
      <branch if failed to loop>
      isync

    done:

      <...>
  }

regards,
alexander.