[libre-riscv-dev] [Bug 310] Function Units to cover multiple tasks

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=310

Michael Nolan <mtnolan2640 at gmail.com> changed:

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                 CC|                            |mtnolan2640 at gmail.com

--- Comment #1 from Michael Nolan <mtnolan2640 at gmail.com> ---
On 5/14/20 10:43 AM, Luke Kenneth Casson Leighton wrote:
> btw, you'll like this: because we are doing a parallel processor,
> different Function Units *can* actually cover multiple tasks   let's
> not go into that right now, however if we convert power_enum Function
> into an unary field (1<<0, 1<<1, 1<<2) then we can, in the CSV files,
> set multiple bits.
>
> a good example would be AND and OR and XOR: those are prime candidates
> to put into *both* the Logical *and* Arithmetic pipelines.  recorded
> it for now:
> https://bugs.libre-soc.org/show_bug.cgi?id=310


So this is sort of like what intel has on their processors. More complicated
instructions can only execute on one port, but simple and frequently used ones
can run on several.

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