[eigen] Use of vec_min/max on ppc

["Everton Rufino Constantino1" <everton.constantino@xxxxxxx>]

Hi,

looking at the implementation of pmin and pmax for Packet4f on Altivec/PacketMath.h I came across the following statement to justify not using VSX's intrinsics:

 

"// NOTE: about 10% slower than vec_min, but consistent with std::min and SSE regarding NaN"

 

I fail to understand the reasoning, afaik ppc and stdlib both are IEEE compatible right? Can somebody please clarify the statement? I think sometime in the past ppc had a non-IEEE mode that you could turn on or off but that's gone for a while now.

 

Best regards,

Everton Constantino

<everton.constantino@xxxxxxx>