[Libre-soc-bugs] [Bug 550] binutils support needed for svp64

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=550

--- Comment #83 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
dmitry, saw the message to binutils (thank you for ccing me)

my thoughts after a week are, the struct is ok - but will need
separating out into a separate struct, so that it can be
copied into the ppc_binutils field which is #ifdef'd out

struct svp64_stuff // no more than 64 bits
{
    bitfield1: 1
    bitfield2: 1
    ...
};

struct svp64_autogenerated_list
{
     char *name;
     struct svp64_stuff stuff;
};

struct svp64_autogenerated_list list[200]=
   {{name="add", ....}
    ...
   }

and in binutils:

struct ppc_binutils_fields
     ....
     .....
#ifdef SVP64
     struct svp64_stuff svp64;
#endif
};

note: *not* a *pointer* to struct svp64_stuff.  repeat: *not* a pointer
because the total number of bits going into any svp64_stuff *will* be
*below* 64-bit and will *never* go above 64-bit, ever.

(it may be useful therefore to dedicate one bit to indicate that the
entry is valid)

struct svp64_stuff // no more than 64 bits
{
    valid: 1;
    bitfield1: 1
    bitfield2: 1
    ...
};

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