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Prefer BLENDVPD over VBLENDVPD if the latter doesn't save any instructions. VBLENDVPD allows separate source and destination registers, which can eliminate a MOVAPD/MOVSD. However, on Intel since Skylake, VBLENDVPD takes additional uops to execute compared to BLENDVPD (according to https://uops.info). On AMD and older Intel microarchitectures there is no difference.