Hi,
On Wed, 16 Feb 2005, Gary Funck wrote:
> struct shared_ptr_struct
> {
> unsigned int phase : 24;
> unsigned short thread : 16;
> void *addr;
> };
>
> On the x86_64 (ie, Opteron[tm]) platform, GCC appears to designate the
> underlying mode of this type as a BLKmode, instead of a TImode. This
>
> I haven't tried making the suggested change to see if the x86_64 code
> generator can fully support it. Are there any technical reasons that
> the x86_64 shouldn't target 128 bit structs into a long double (ie, two
> 64 bit registers)?
Ugh, good catch. If changing MAX_FIXED_MODE_SIZE doesn't affect the ABI
(and I wouldn't know why it should) then we could change it. (it
optimizes a simple test program copying and passing your structure
around).
Ciao,
Michael.
