PPC440, GCC-4.1.1 supposes cr{2,3,4} saved but the hard real time kernel doesn't...

[Ian Lance Taylor]

Etienne Lorrain <etienne_lorrain@yahoo.fr> writes:

> My problem is quite simple, the PPC has few conditions registers and some are assumed to be saved over function calls (in my test case NU_Sleep()), but the hard real time kernel do not save those (partial flags) registers.
> This behaviour is perfectly documented in gcc-4.1.1/gcc/config/rs6000 line 709, but is there a simple solution (maybe involving recompiling the compiler) to force re-testing values after function calls?
> I do remember the i386 option -mreg-alloc="dacbSDB", but it does not seem to be supported for PPC; the best would be a compiler option to say "full CC register clobber by function call".

You want the -fcall-used-REG option.  See the documentation.

Ian