Re: GCC8 v.s. amiga

[Rin Okuyama <rokuyama.rk%gmail.com@localhost>]

Hi,

On 2020/06/25 20:26, Michael van Elst wrote:
> rokuyama.rk%gmail.com@localhost (Rin Okuyama) writes:
>
> > kernels for sun3 and luna68k seem (almost) OK. Kernel for mac68k
> > works if -fno-omit-frame-pointer is specified (-fomit-frame-pointer
> > is enabled by default for optimize levels >= -O1 for GCC8).
>
> Just tried a gcc8 compiled 9.99.68 kernel on an emulated 68040 Amiga.
> No problems to see.

Thank you very much for testing!

Hmm, then it is problem peculiar to 68060, or GCC miscompile something
with tuning for 68060. I observed the problem both for -m68060 and
-m68020-60.

Which compiler flag do you use? Do you use GENERIC? Then, it is
compiled with -m68020-60 by arch/m68k/Makefile.cmachflags...

Or emulator accepts some kinds of instructions that do not work on
real hardwares?

Thanks,
rin