Matthias Kretz <kretz@xxxxxxxxxxxxxxxxxxxxxxxx> writes:
> I experience a miscompile with GCC 4.6.0 (#48616) and was trying to implement
> a workaround in my library, but no success. The bug is connected to use of the
> XOP instruction set and -ftree-vectorize. So I thought I can just disable one
> or both of those in the function where the miscompile happens. But that
> function is a member of a template class and thus inlined. Apparently that
> leads to neither "#pragma GCC optimize/target" nor
> "__attribute__((optimize/target))" changing anything, or is that another bug?
>
> Anyway this is what I got:
>
> #define VC_WORKAROUND __attribute__((optimize("no-tree-vectorize"),target("no-
> xop")))
>
> template<> inline Vector<T> &VC_WORKAROUND VectorBase<T>::operator>>=(const
> VectorBase<T> &x)
> {
> for_all_vector_entries(i,
> d.m(i) >>= x.d.m(i);
> );
> return *static_cast<Vector<T> *>(this);
> }
>
> vector.tcc:286:1: sorry, unimplemented: inlining failed in call to
> âVc::SSE::Vector<T>& Vc::SSE::VectorBase<T>::operator<<=(const
> Vc::SSE::VectorBase<T>&) [with T = int]â: target specific option mismatch
>
>
> Any suggestions how to implement a workaround?
I have no suggestions for a workaround, but I don't think this should
fail with an error like this for a function that does not have the
always_inline attribute. It should just not inline, and give a warning
with -Winline. Please consider opening a bug report. Thanks.
Ian
