[Bug target/30271] -mstrict-align can an store extra for struct agrument passing

[pinskia at gcc dot gnu dot org]

------- Comment #10 from pinskia at gcc dot gnu dot org  2008-12-16 02:08 -------
(In reply to comment #9)
> Andrew, 
> 
> What is your point here?

My point here is that currently we do:
      gi->frame_related =
        (base == frame_pointer_rtx) || (base == hard_frame_pointer_rtx);

But if we change it to be:
      gi->frame_related =
        (base == frame_pointer_rtx) || (base == hard_frame_pointer_rtx)
        || (base == arg_pointer_rtx && fixed_regs[ARG_POINTER_REGNUM]);

It would delete the store (at least in a 4.3 based compiler).  arg_pointer_rtx
is the incoming argument space so if it is a fixed register it will be also
frame related and we can safely delete the stores to this space.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30271