[libre-riscv-dev] [Bug 186] Create decoder for SOC: Power ISA and RISC-V

[bugzilla-daemon@libre-riscv.org]

http://bugs.libre-riscv.org/show_bug.cgi?id=186

--- Comment #83 from Michael Nolan <mtnolan2640@gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #81)
> https://git.libre-riscv.org/?p=soc.git;a=blob;f=src/soc/decoder/
> power_fieldsn.py;h=a5e03a114ec54d915deb13f20c99e8ab59078dc5;hb=HEAD#l31
> 
> try subtracting start and end from from len-1, and sign inverting step, at
> line 31

It's giving a key error because the index (31) isn't in the "dict" (I printed
out the object and it gave SignalBitRange([(0, 31)]), and I assume it treats
that as {0: 31}).

What's the purpose of line 1?
                k = OrderedDict.__getitem__(self, t)
                res.append(self.signal[k]) # reverse-order here
I think it'd work ok if I just grabbed the bit from the signal directly, like
so:
                res.append(self.signal[t])

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