GCC 4.6 is inserting unnecessary MOVAPS instructions for SSE intrinsics

[Marc Glisse]

On Wed, 23 Nov 2011, Leith Bade wrote:

> I have been hand optimising a loop that GCC 4.6 was not able to vectorise.
>
> I have been keeping an eye on the assembly output of this loop and
> have noticed GCC inserting unnecessary MOVAPS instructions.

Yes, there are several bugzilla entries showing that the register 
allocator is doing a fairly poor job on SSE/AVX registers...

-- 
Marc Glisse