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

[hjl at lucon dot org]

------- Comment #9 from hjl at lucon dot org  2007-10-03 22:17 -------
(In reply to comment #8)
> Subject: Re:  attribute((aligned)) doesn't work for variables on the stack for
> greater than required alignement
> 
> On 3 Oct 2007 22:04:28 -0000, hjl at lucon dot org
> <gcc-bugzilla@gcc.gnu.org> wrote:
> >
> >
> > ------- Comment #7 from hjl at lucon dot org  2007-10-03 22:04 -------
> > What is the performance impact of
> >
> > http://gcc.gnu.org/ml/gcc-patches/2007-05/msg01167.html
> 
> The performance impact is non if the variables don't need aligned.
> Otherwise you get a small penality at the very begining for the
> alignment of the variable itself.  Really this is only to be used with
> big alignments like 128byte alignment (for using with a DMA system
> like in the Cell).
> 

What is the performance if the stack alignment adjustment is required in
all functions with floating point variables on stack?


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