On October 21, 2017 9:50:13 PM GMT+02:00, Denis Bakhvalov
wrote:
>Hello Richard,
>Thank you. I achieved vectorization with vf = 16, using
>#pragma GCC optimize ("no-unroll-loops")
>__attribute__ ((__target__ ("sse4.2")))
>and options -march=core-avx2 -mprefer-avx-128
>
>But now I have a question:
Hello Richard,
Thank you. I achieved vectorization with vf = 16, using
#pragma GCC optimize ("no-unroll-loops")
__attribute__ ((__target__ ("sse4.2")))
and options -march=core-avx2 -mprefer-avx-128
But now I have a question: Is it possible in gcc to have vectorization
with vf < 16?
On 20/10/2017,
On Fri, Oct 20, 2017 at 12:13 PM, Denis Bakhvalov wrote:
> Thank you for the reply!
>
> Regarding last part of your message, this is also what clang will do
> when you are passing vf of 4 (with the pragma from my first message)
> for the loop operating on chars plus using SSE2. It will do meaningf
Thank you for the reply!
Regarding last part of your message, this is also what clang will do
when you are passing vf of 4 (with the pragma from my first message)
for the loop operating on chars plus using SSE2. It will do meaningful
work only for 4 chars per iteration (a[0], zero, zero, zero, a[1
On Thu, Oct 19, 2017 at 10:38:28AM +0200, Richard Biener wrote:
> On Thu, Oct 19, 2017 at 9:22 AM, Denis Bakhvalov wrote:
> > Hello!
> >
> > I have a hot inner loop which was vectorized by gcc, but I also want
> > compiler to unroll this loop by some factor.
> > It can be controled in clang with t
On Thu, Oct 19, 2017 at 9:22 AM, Denis Bakhvalov wrote:
> Hello!
>
> I have a hot inner loop which was vectorized by gcc, but I also want
> compiler to unroll this loop by some factor.
> It can be controled in clang with this pragma:
> #pragma clang loop vectorize(enable) vectorize_width(8)
> Plea
