[Libre-soc-dev] Hardware-accelerated specialized instructions

Luke Kenneth Casson Leighton lkcl at lkcl.net
Fri Dec 11 01:02:54 GMT 2020

On 12/11/20, Jacob Lifshay <programmerjake at gmail.com> wrote:

> So, maybe we do need the widening mul anyway.

although it was many years ago, we do need to bear in mind that, like
an archaeological dig has to recreate a picture by guessing what was
going on from glimpses of the past, we know that VSX was designed for
video, audio and 3D [of its era].

consequently with a bit of thought, we will find the occasional
resonance and justification as to why a particular instruction exists.

nobody adds opcodes to an ISA without a damn good reason, it's just too costly.


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