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Re: binutils port to a new 16bit little endian uC
- From: Paul Koning <Paul_Koning at dell dot com>
- To: dj at redhat dot com
- Cc: aurelien dot buhrig at tiempo-ic dot com, binutils at sourceware dot org
- Date: Tue, 19 Feb 2008 10:03:49 -0500
- Subject: Re: binutils port to a new 16bit little endian uC
- References: <000b01c872da$df15e450$9d41acf0$@buhrig@tiempo-ic.com> <xnve4l9hpo.fsf@greed.delorie.com>
>>>>> "DJ" == DJ Delorie <dj@redhat.com> writes:
DJ> Aurélien Buhrig <aurelien.buhrig@tiempo-ic.com> writes:
>> The new architecture is a 16-bit uC. The instructions are
>> therefore 16 bit wide, possibly followed by a 8bit or 16 bit
>> immediate value for the 2 word instructions.
DJ> Just FYI, CGEN doesn't like variable length opcodes. It can be
DJ> done (see the m32c files) but it's neither pretty nor easy.
DJ> m32c is, however, a fixed-endian chip. Might be a useful
DJ> reference port anyway.
Another example might be the pdp11 -- also fixed endian, but 16 bit
with 1-3 word instructions.
paul