------- Comment #11 from hjl dot tools at gmail dot com 2009-01-05 23:08
-------
(In reply to comment #7)
> (In reply to comment #5)
> > There is padding between adjustedPtr and unwindHeader because the latter is
> > forced to be maximally aligned. Due to the additional member the padding
> > was
> > reduced. Also, the alignment of _Unwind_Exception depends on -mavx.
> >
>
> I don't see any need for extra alignment on _Unwind_Exception:
>
> struct _Unwind_Exception
> {
> _Unwind_Exception_Class exception_class;
> _Unwind_Exception_Cleanup_Fn exception_cleanup;
> _Unwind_Word private_1;
> _Unwind_Word private_2;
>
> /* @@@ The IA-64 ABI says that this structure must be double-word aligned.
> Taking that literally does not make much sense generically. Instead we
> provide the maximum alignment required by any type for the machine. */
> } __attribute__((__aligned__));
>
> I think it should have a fixed alignment for a given target.
>
The ia64 psABI says _Unwind_Exception should be aligned at
double-word. But it isn't very clear what is the size of
double-word. It does say "long long" is 8 byte doubleword.
We have
[...@gnu-6 config]$ grep BIGGEST_ALIGNMENT ia64/ia64.h
#define BIGGEST_ALIGNMENT 128
[...@gnu-6 config]$
We can't change it now no matter what the size of
double-word is.
--
hjl dot tools at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
BugsThisDependsOn|38737 |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38732
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