OPENCORES.ORG

> The problems I've seen happen with double integer types. eCos uses

I've applied the patch that should resolve this. can you confirm
this problem still exists in most recent gcc-3.2.3 from opencores cvs ?

regards,
p.

* fredrik@w... (fredrik@w...) wrote:
> > The problems I've seen happen with double integer types. eCos uses 
> > them 
> > a lot.
> 
> I've have problems with 64-bit types (unsigned long long) also with
> GCC3.2.x and GCC3.3.x, this when compiling ARM-code with arm-elf-gcc
> target and -O2. I think its the GCC optimizer that is buggy, not
> especially OR related maybe.
> 
> I think that what happened when compiling 64-bit arithmetic for an
> 32-bit processor, the operation is divided into two 32-bit
> instructions. The optimizer seems to allow reordering of the latter
> instruction, which in some cases can cause that the 64-bit result is
> used before its completely calculated. Only the first 32-bit half is
> done when its used.
> 
> It would be interesting to compile your sample code also for other
> GCC-targets. Maybe this is something rather for the GCC-team to look into?
> 
> Best Regards,
> /Fredrik Hederstierna
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