Extremely CISC instructions

Chuck Guzis cclist at sydex.com
Tue Aug 24 10:16:47 CDT 2021

On 8/24/21 3:34 AM, Diane Bruce via cctalk wrote:
> Indeed. Just its addressing modes, with indirection and two separate register indexing operations, are hairy enough.  Then consider the decimal arithmetic instructions that might have up to 6 operands.
> And who can ever forget the built in CRC instruction?
> Amusingly it was demonstrated that many of the CISC instructions were
> faster if one just did them with the 'normal' instruction set.

Feh, many ARM Cortex MCUs have a hardware CRC generator.

Where's the vector dot product instruction or the transpose instruction?
 How about the search masked masked key?

If CPU doesn't have a variable-length decimal divide it isn't really
CISC in the grand sense.


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