Re: Builtin expansion versus headers optimization: Reductions

[Ondřej Bílka]

On Fri, Jun 05, 2015 at 12:55:04PM +0400, Mikhail Maltsev wrote:
> 05.06.2015 13:02, Ondřej Bílka writes:
> > Also as I mentioned bugs before gcc now doesn't handle alignment well so
> > it doesn't optimize following to zero for aligned code.
> > 
> >  align = ((uintptr_t) x) % 16;
> > 
> That is because GCC is conservative and supports some non-ABI-compliant
> memory allocators which only guarantee 8-byte alignment, but
> 
Then adding these annotations wouldn't help much as one could interpose
malloc and violate that, unless we rule out that it shouldn't be
replaced by noncompilant one.