[rc5] Client optimizations
msissom at dnaent.com
Tue Jul 29 15:11:43 EDT 1997
At 11:58 AM 7/29/97 -0700, you wrote:
>Murray Stokely wrote:
>> % Is this correct? Is anyone considering 6x86MX and K6 optimizations?
No one has(yet) discovered any rc5/MMX optimizations that are worthwhile.
>> % It seems like the K6's are really slow for their clock speed. Can
>> % anyone confirm whether or not they have a rotate instruction? It
>> % been speculated that they might not, but no one was able to
>> % confirm/deny this with authority. Just curious, especially about
>> % 6x86MX optimization. Besides better branch prediction and a larger
>> % (64k) L1 cache, is it that much different from the 6x86?.
>> Of course they have a rotate instruction. it is an x86 chip, therefor
>> it can execute all the x86 instructions.
Indeed, so is my x86 simulator that I use for debugging, and it can
execute the x86 instructions; but it does not have a native,
multi-bit-variable-on-register-rotate implemented in hardware, and
so it does it slowly.
>But it is certainly possable that the decoder could accept the
>instruction only to convert it into a series of other "native"
Which is, of course, what it does.
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