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

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Thu May 14 15:47:48 BST 2020


Michael Nolan <mtnolan2640 at gmail.com> changed:

           What    |Removed                     |Added
                 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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