Yes, the missing 64-bit conversion is the key problem, I will try removing isync later.
Thanks for your support.2010/3/26 Segher Boessenkool <segher@kernel.crashing.org>
> Yes indeed. Could you post the relevant piece if disassembly from
> your original binary (the one that has the problem)? Or send me the
> binary (not to the mailing list), I'll do it then.
Ah scratch that. I compiled your original code (after fixing the
compile errors -- there is no such type as "bool" in C).
The problem is that (upper << 32) | lower thing. "upper" is a 32-bit
type, so shifting it by 32 or more bits is undefined. GCC compiles this
to (shortened):
0: mftbu 9 ; mftbl 11 ; mftbu 0 ; cmpw 0,9 ; bne 0b # so far so good
slwi 0,0,0 ; or 4,0,11 ; li 3,0 ; blr
so it shifts by 0, i.e. it does upper | lower .
Case closed, no hardware problem :-)
Segher