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Unfortunately This page has nil for Arm64 CPU's and documentation however THIS page below Will hopefully grow till added to above. still has older Settings , included for reference and or adding in.

RPI4/Rock64 Rock64pro and Pinebookpro laptop.

   /etc/portage/make.conf - My rpi4 make.conf file
COMMON_FLAGS="-O2 -pipe -march=armv8-a+crc+crypto -mcpu=cortex-a72.cortex-a53 -mfloat-abi=hard -mfpu=neon-fp-armv8 -mneon-for-64bits ${GRAPHITE} ${CPU_FLAGS_ARM64}"
CPU_FLAGS_ARM64="edsp neon thumb vfp vfpv3 vfpv4 vfp-d32 crc32 v4 v5 v6 v7 v8 thumb2"
GRAPHITE="-floop-interchange -ftree-loop-distribution -floop-strip-mine -floop-block -ftree-vectorize"

' (app-portage/cpuid2cpuflags output) with a few force use edits

For Rpi4 soon Vulkan-vc? gpu for now Vc4 , Odroid-X4 ? Rock64/Pine64/Pinebook varriants also mali/bifrost panfrost kernel mode drivers , Panfrost being opensource. template ...

Thunder X2 Server/Workstation

on Necrose99 (talk) 06:14, November 22, 2020 (UTC)Necrose99's shopping list No settings for this ATM... but i might have in a few weeks . 48 cores upto x2 up to 90 in some server chassis.

template to swap --- edit more ltr --stash for now.

   /etc/foo.conf - My foo.conf file
# /etc/host.conf:
# $Header: /var/cvsroot/gentoo/src/patchsets/glibc/extra/etc/host.conf,v 1.1 2006/09/29

Thunder x3 or successor is planed.

Ampere® Altra™ Server/Workstation

(offers up to 80 cores at up to 3.0 GHz speed with sustained turbo) No settings for this ATM...