How and when is "cpu_has_sse4_1" true? Is it controllable at runtime
through setting some environmental variable? or is it set once during
startup by detecting CPU features?
I guess checking for "cpu_has_sse4_1" is unnecessary if it isn't
controllable by user at runtime; because "USE_SSE41" is a compile time
check and requires the target machine to be SSE 4.1 capable already.
Best regards,
Siavash Eliasi.
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