[Gllug] arch & cpu number confusion

[Christian Smith]

On Fri, 6 Jan 2006, Richard Jones wrote:

>On Fri, Jan 06, 2006 at 10:52:28AM +0000, Nix wrote:
>> speedups under some circumstances because we can use CMOV, and of course
>> -march=sparcv8 and above has huge advantages for some loads on SPARCs
>> because SPARCv7 didn't have integer multiply or divide
>> operations. (There is an enormous speedup to SSH negotiation when
>> OpenSSL is compiled for SPARCv8, for instance.)
>
>I thought that SPARCv7 was forward compatible - ie. it would trap the
>unknown instruction and emulate it?  Assumes your OS knows about the
>new instructions of course ...


But it is really slow to emulate the instructions on SPARC V7. The
emulation must be done in software.


>
>Rich.
>
>

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