[PATCH, MIPS] fix MIPS16 jump table overflow

[Andrew Pinski]

On Wed, Aug 22, 2012 at 7:15 PM, Sandra Loosemore
<sandra@codesourcery.com> wrote:
> On 08/21/2012 02:23 PM, Richard Sandiford wrote:
>>
>>
>> Would be nice to add a compile test for -mabi=64 just to make sure
>> that Pmode == DImode works.  A copy of an existing test like
>> code-readable-1.c would be fine.
>
>
> I'm having problems with this part -- it seems like every combination of
> options with -mabi=64 I've tried with code-readable-1.c complains about
> something-or-another being incompatible.  The closest I've come is "-mabi=64
> -march=mips64 -msoft-float", which is accepted by the mipsisa32r2-sde-elf

Did you test this at all on a mips64-*-* target?  After this change
n64 jump tables are broken.
Before CASE_VECTOR_MODE was DImode for n64 .

See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54371 for why it fails.
gpdword produces a double word for n64.

For EABI64 it is ok to load 32bits because that the addresses are
32bits but for n64, it is not ok.  The load addresses are normally
above the 32bits boundary.

Thanks,
Andrew Pinski