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Re: patch to fix constant math
On Mon, Oct 8, 2012 at 5:01 PM, Nathan Froyd <froydnj@mozilla.com> wrote:
> ----- Original Message -----
>> Btw, as for Richards idea of conditionally placing the length field
>> in
>> rtx_def looks like overkill to me. These days we'd merely want to
>> optimize for 64bit hosts, thus unconditionally adding a 32 bit
>> field to rtx_def looks ok to me (you can wrap that inside a union to
>> allow both descriptive names and eventual different use - see what
>> I've done to tree_base)
>
> IMHO, unconditionally adding that field isn't "optimize for 64-bit
> hosts", but "gratuitously make one of the major compiler data
> structures bigger on 32-bit hosts". Not everybody can cross-compile
> from a 64-bit host. And even those people who can don't necessarily
> want to. Please try to consider what's best for all the people who
> use GCC, not just the cases you happen to be working with every day.
The challenge would of course be to have the overhead only for a minority
of all RTX codes. After all that 32bits are free to be used for every one.
And I would not consider RTX a 'major compiler data structure' - of course
that makes the whole issue somewhat moot ;)
Richard.
> -Nathan