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

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Mon May 25 01:56:02 BST 2020


--- Comment #21 from Cesar Strauss <cestrauss at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #1)
> * third - and this is the kicker - that the FSM for src1_i needs a Mux to
> select RA or zero *and* it needs to *no longer* request a READ for src1
> (rd.req[0]) if the ra_is_zero flag is set.
> * additionally that if the z flag is set, the rd_done part of the FSM does
> NOT wait for GO_READ on the src1 port (rd.go[0])

Just a reminder that the FSM still needs adjustment for rd.rel/rd.go. Checked
in GTKWave that rd.rel is still being set unconditionally after issue_i.

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