Re: PowerPC optional instructions
Re: PowerPC optional instructions
- Subject: Re: PowerPC optional instructions
- From: Pavol Markovic <email@hidden>
- Date: Wed, 26 May 2004 22:00:42 +0200
If you look into motorola/ibm cpu tech specs you'll find the answer. If
I remember right it's implemented in G3/G4/G5 CPU's.
My question is, how to use this instruction - asm block in C code?
PM
On 26.5.2004, at 19:53, Os wrote:
I'm using these special instructions quite a lot, like the reciprocal
square root estimate (frsqrte), the float select (fsel) etc. without
problems so far.
I think that's different, in that they are part of the core PowerPC
spec. The difficulty with fres seems to be that it's not even
guaranteed to be implemented at all.
1 in 256 accuracy would probably be fine for my application.
cheers,
os.
email@hidden
http://www.collective.co.uk/
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