On 03/05/2018 12:58 PM, Matthew Miller wrote:
On Mon, Mar 05, 2018 at 12:07:40PM +0100, Florian Weimer wrote:
Should we start compiling Fedora with auto-vectorization, either
using -O3 or -O2 -ftree-loop-vectorize?
What's the performance impact?
You mean, on build time? Difficult to tell.
On Mon, Mar 05, 2018 at 12:07:40PM +0100, Florian Weimer wrote:
> Should we start compiling Fedora with auto-vectorization, either
> using -O3 or -O2 -ftree-loop-vectorize?
What's the performance impact? What are the risks?
--
Matthew Miller
Fedora Project Leader
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Should we start compiling Fedora with auto-vectorization, either using
-O3 or -O2 -ftree-loop-vectorize?
Downstream experimented with that for POWER 7 (the ppc64p7 packages).
But if auto-vectorization is beneficial on POWER, it likely helps on
other CPUs as well, given that SIMD support is qui
