Kevin Strasser authored Apr 05, 2019 and Ville Syrjälä committed Apr 18, 2019

Probe for and make an API available for tests to use f16c intrinsics to
generate needed fp16 pixel data.

Also import a pure c fp32 <-> fp16 conversion implementation from Mesa
18.3.4, which will act as a fallback when f16c is unavailable.

rfc2:
- Change API to reduce number of function calls (Maarten)

v1:
- Move pragma so AVX code isn't emitted for fallbacks (Ville)
- Change edx to ecx (Ville)

Signed-off-by: Kevin Strasser <kevin.strasser@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>