This is the mail archive of the mailing list for the GCC project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: Setting precision for a PSImode type

On Mon, Mar 5, 2012 at 10:38 AM, Bernd Schmidt <> wrote:
> On 03/05/2012 05:24 PM, Peter Bigot wrote:
>> And is there any reason (other than it doesn't seem to have been done
>> before) to believe PSImode is the wrong way to support a
>> general-purpose 20-bit integral type in gcc?
> If you're using 4.7.0, it should be possible to use FRACTIONAL_INT_MODE
> and get reasonable results. However, it hasn't been tested much, since
> the final bits of the patch series which would have added 40 bit int
> support to the C frontend didn't make it in. See the discussion following
> ?

Thanks for the reference; it very much seems what I'm trying to do
will be breaking new ground.  I'm still using 4.6.x, though now that
4.7.x has forked off trunk I may update if that would make the task
easier.  My preference would be to stick with PSImode, as I think
support for it in the machine description infrastructure will be
necessary (there are a large number of opcodes specific to operation
on 20-bit values).


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]