Re: [MiNT] MiNTLib for ColdFire : DONE !

[Vincent Rivière <vincent.riviere@freesbee.fr>]

Peter Persson wrote:
> IIRC the Multiply and Accumulate (MAC) instructions use the 0xAxxx 
> opcode range.

Yes, this is true.
But currently, GCC does generate MAC instructions, so the ColdFire 
executables will not be incompatible because of that.

> Apart from that, ColdFire binaries should run, shouldn't they?

No. The ColdFire lacks a lot of the 680x0 instructions and address 
modes, but it also adds a few new instructions. See at the bottom of 
this page:
http://www.microapl.co.uk/Porting/ColdFire/cf_68k_diffs.html

For example, there is no add.b and add.w on ColdFire. The data must be 
fetched into a register, then add.l can be used. The new mvs and mvz 
instructions can be used to fetch a byte or a word, then fill the 
remaining part of the target register to be suitable for add.l.

Some examples here (in French):
http://coldfire.zewan.com/68k_cf.htm

GCC uses a lot these new instructions, as well as 68020 instructions 
compatible with ColdFire, so without a CPU check ColdFire binaries 
crashes on 68000 and 68020.

--
Vincent Rivière