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Date: Mon, 22 Jun 2009 16:19:00 -0000
From: Doug Evans <dje@sebabeach.org>
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To: Dave Brolley <brolley@redhat.com>
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Subject: Re: CGEN_BITSET
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Hi.  Thanks.

More than 32 ISAs?  Yikes!

Going forward, we could add a vbitset attribute kind (or some such), or 
we could convert all bitsets to use CGEN_BITSET.  I guess I'm leaning 
toward the latter, but I can imagine situations where one would rather 
just have an unsigned int.

Dave Brolley wrote:
> Hi Doug,
>
> The mep port required an inderminate and configurable number of ISA's 
> to be possible, so we needed something that could represent an 
> unspecified number of bits (more then 32 or 64 possibly) in a mask. 
> The intent was not to treat isa specially. It just turned out to be 
> the first bit mask to require this treatment.
>
> CGEN_BITSET is simply a bit mask represented by character strings as 
> opposed to integers.
>
> Dave
>
> Doug Evans wrote:
>> Treating "isa" specially is a bit of a hack.  What's the story behind 
>> CGEN_BITSET?
>>
>> (define (gen-attr-type attr)
>>  (if (string=? (string-downcase (gen-sym attr)) "isa")
>>      "CGEN_BITSET"
>>      (case (attr-kind attr)
>>        ((boolean) "int")
>>        ((bitset)  "unsigned int")
>>        ((integer) "int")
>>        ((enum)    (string-append "enum " (string-downcase (gen-sym 
>> attr)) "_attr"))
>>        ))
>> )
>>