[libre-riscv-dev] [Bug 272] functions needed in POWER simulator which match 3.0B spec

[bugzilla-daemon at libre-riscv.org]

http://bugs.libre-riscv.org/show_bug.cgi?id=272

--- Comment #12 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Luke Kenneth Casson Leighton from comment #11)

> i will attempt a pre and post process tomorrow which basically duplicates
> what you did to get src1 2 etc out of the opcode.

done - it works (although the code's a dreadful mess)

if you'd like to do that Int class i can use it immediately.
or, if you want to give it a shot, knock yourself out.

        for i in range(32):
            self[i] = [0] * 64 # TODO: needs to be IntClass(value=0, len=64)

the class needs to be something like:

class IntClass
    def __init__(self, value, len):
        self.value = value
        self.len = len

then __add__ etc. all have to return an object which first asserts that
the len is the same for both operands.

the one thing, assign (now in soc/decoder/pseudo/parser.py) will, instead
of returning ast.Assign(name, expr) will have to return something like
this:

ast.Call(func=ast.Attribute(value=ast.Name(id='x'), attr='eq'),
                args=[Num(n=5)],
                keywords=[],
                starargs=None,
                kwargs=None))])

i got that from a little test program, parsing this:

x.eq(5)

so when we see "x <- 5"...

i'll add it to the parser, commented-out.

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