[lkml]   [2002]   [Jan]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [Q] Looking for an emulation for CMOV* instructions.
Followup to:  <>
By author: Andi Kleen <>
In newsgroup:
> One corner case where emulation would IMHO make sense would be CMPXCHG8.
> It would allow to do efficient inline mutexes in pthreads, and hit the
> emulation only on 386/486. cpu feature flag checking is unfortunately
> not an option normally for inline code.

You don't need CMPXCHG8B to do efficient inline mutexes. In fact, the
pthreads code for i386 uses the same mutexes the kernel does (LOCK INC
based, I believe), complete with section hacking to make them
efficiently inlinable -- and then they're put inside a function call.
I believe "kill me now" is an appropriate response.


<> at work, <> in private!
"Unix gives you enough rope to shoot yourself in the foot." <>
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:18    [W:0.104 / U:1.836 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site