[Bug middle-end/16660] attribute((aligned)) doesn't work for variables on the stack for greater than required alignement

[pinskia at gcc dot gnu dot org]

------- Comment #11 from pinskia at gcc dot gnu dot org  2007-10-03 22:40 -------
(In reply to comment #7)
> It saves stack pointer in frame pointer. Can we implement it for suitable
> cases/backends and properly handle

This only helps x86 really.  If you look at my patch, it already implements
(correctly) handling large cases like 128byte alignment (which people use with
the Cell).  What you are proposing will cause more stack to be used than
actually required and more complex for the normal case.  If you look at my
patch, you will see it handles 1-4 issues nicely without any problems (because
the stack itself is not realigned).  Oh on PPC, the stack pointer has to be
correct so you cannot use frame pointer to be the old stack pointer.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16660