[Libre-soc-isa] [Bug 1055] update ls004 OPF RFC to include LD-ST-Shifted instructions

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1055

--- Comment #21 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
i have this:

Z23-Form

stbupsx RS,RA,RB,SH
Pseudo-code:

EA <- (RA) + (RB)<<(SH+1)
ea <- (RA)
MEM(ea, 1) <- (RS)[XLEN-8:XLEN-1]
RA <- EA


you had this:


EA <- (RA)<<(SH+1) + (RB)



X-Form

lbzupsx RT,RA,RB,SH
Pseudo-code:

EA <- (RA)<<(SH+1)
RT <- ([0] * (XLEN-8)) || MEM(EA, 1)
RA <- (RA) + (RB)

shoud be:

X-Form

lbzupsx RT,RA,RB,SH
Pseudo-code:

EA <- (RA)
RT <- ([0] * (XLEN-8)) || MEM(EA, 1)
RA <- (RA) + (RB)<<(SH+1)

etc etc

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