A bug in GCC 2.95.2 for SPARC

[James Cheng]

David,

>    It turned out to be an implementation dependency of the UltraSPARC.
>    On page 249 of "UltraSPARC User's Manual, Revision 2.0 - June 1996"
>    there is:
> 
> 	   LDDF{A}/STDF{A} cause an LDDF/STDF_mem_address_not_aligned
> 	   trap if the effective address is 32-bit aligned but not
> 	   64-bit (doubleword) aligned.
> 
>    I have tried the gcc 2.96 version 2.96 20000501 (experimental) with 
>    -mcpu=ultrasparc, and the problem I reported earlier is gone.
> 
> Solaris should have been resolving and handling those unaligned
> accesses for the application though, at least Linux on UltraSparc
> does.

Based on my experience, none of Solaris 2.5.1, 2.6, 7, or 8 is 
resolving those unaligned accesses other than throwing bus error
and dumping core. I don't know why, maybe for forcing compilers
to generate faster code :-)

Thanks,

-James