[libre-riscv-dev] [Bug 336] ALU CompUnit needs to recognise that RA (src1) can be zero

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=336

--- Comment #42 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
Cesar: this is kiiinda true... indirectly :)  i'm mulling over the words...

rdmask disables (entirely disables) bits of rd.rel, and consequently
rd.go *should* never be raised.  rd.rel being the output (which is
masked out), rd.go being the input, it's a "protocol violation" if
raised.

commit f930c1814f19c41f082c819494cf246edd09082d
Author: Cesar Strauss <cestrauss at gmail.com>
Date:   Mon Jun 1 07:56:12 2020 -0300

    Add rdmaskn parameter and assert it along issue_i

    Like zero_a and imm_ok, rdmaskn disallows the activation of go.

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