How to choose GCC options for Neon r0p4

ARM cumunity,

We are design a SOC with Neon (r0p4) integrated. I saw the GCC have multiple options for Neon:

Known ARM FPUs (for use with the -mfpu= option):
auto crypto-neon-fp-armv8 fp-armv8 fpv4-sp-d16 fpv5-d16 fpv5-sp-d16 neon
neon-fp-armv8 neon-fp16 neon-vfpv3 neon-vfpv4 vfp vfp3 vfpv2 vfpv3 vfpv3-d16
vfpv3-d16-fp16 vfpv3-fp16 vfpv3xd vfpv3xd-fp16 vfpv4 vfpv4-d16

gcc version 8.3.0 (GNU Toolchain for the A-profile Architecture 8.3-2019.03 (arm-rel-8.36))

The SOC integration engineer also don't know how to choose from them for best match of our HW. Can you help us? Thanks in advance.

BR

/Li

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