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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>
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