2.8 gcc on m68k

David Fiddes D.J.Fiddes@hw.ac.uk
Thu Feb 26 01:04:00 GMT 1998


Hi,

>I noticed that a particular set of operations was slower in the new 2.8
>compiler.  Does anybody know what could be done to get back the 2.7.2.1
>speed, and still have the 68060 support?
>
>It appears that in general
> move rX(nn), rX(mm)
>has been replaced with
> move rX(nn), rY
> move rY, rX(mm)


Sounds to me like one of the ColdFire mods has escaped. I know that that
that particular combination of instructions is illegal on the ColdFire
architecture and that a lot of the m68k.md was modified between 2.7.1 and
2.8.

Dave




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