math: Add fast-path to fmaHEADorigin/masterorigin/HEADmaster

For normal numbers there is no need to issue scalbn, the fma can set
the exponend directly.   Performance-wise on x86_64-linux-gnu without
multi-arch it shows a latency improvement of ~5% and throughput of %7
(and sligth more for ABIs witht tail-call optimization).

Checked on x86_64-linux-gnu and i686-linux-gnu with --disable-multi-arch.
Reviewed-by: Wilco Dijkstra  <Wilco.Dijkstra@arm.com>

0 files changed, 0 insertions, 0 deletions