coretex a-53: 256bit vector - arm

Question

Following is the info of the CPU in a cortex A53 embedded target.
How can I know is this CPU supports 256bit vectoer (e.g float32x8)
Thank you,
Zvika
sidekiq#z3u:~$ cat /proc/cpuinfo
processor : 0
BogoMIPS : 200.00
Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4
sidekiq#z3u:~$ lscpu
Architecture: aarch64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 1
Core(s) per socket: 4
Socket(s): 1
Vendor ID: ARM
Model: 4
Model name: Cortex-A53
Stepping: r0p4
CPU max MHz: 1199.9990
CPU min MHz: 299.9990
BogoMIPS: 200.00
Flags: fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
sidekiq#z3u:~$ cpufreq-info
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpufreq#vger.kernel.org, please.
analyzing CPU 0:
driver: cpufreq-dt
CPUs which run at the same hardware frequency: 0 1 2 3
CPUs which need to have their frequency coordinated by software: 0 1 2 3
maximum transition latency: 500 us.
hardware limits: 300 MHz - 1.20 GHz
available frequency steps: 300 MHz, 400 MHz, 600 MHz, 1.20 GHz
available cpufreq governors: performance
current policy: frequency should be within 300 MHz and 1.20 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 1.20 GHz.
cpufreq stats: 300 MHz:0.00%, 400 MHz:0.00%, 600 MHz:0.00%, 1.20 GHz:100.00%
analyzing CPU 1:
driver: cpufreq-dt
CPUs which run at the same hardware frequency: 0 1 2 3
CPUs which need to have their frequency coordinated by software: 0 1 2 3
maximum transition latency: 500 us.
hardware limits: 300 MHz - 1.20 GHz
available frequency steps: 300 MHz, 400 MHz, 600 MHz, 1.20 GHz
available cpufreq governors: performance
current policy: frequency should be within 300 MHz and 1.20 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 1.20 GHz.
cpufreq stats: 300 MHz:0.00%, 400 MHz:0.00%, 600 MHz:0.00%, 1.20 GHz:100.00%
analyzing CPU 2:
driver: cpufreq-dt
CPUs which run at the same hardware frequency: 0 1 2 3
CPUs which need to have their frequency coordinated by software: 0 1 2 3
maximum transition latency: 500 us.
hardware limits: 300 MHz - 1.20 GHz
available frequency steps: 300 MHz, 400 MHz, 600 MHz, 1.20 GHz
available cpufreq governors: performance
current policy: frequency should be within 300 MHz and 1.20 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 1.20 GHz.
cpufreq stats: 300 MHz:0.00%, 400 MHz:0.00%, 600 MHz:0.00%, 1.20 GHz:100.00%
analyzing CPU 3:
driver: cpufreq-dt
CPUs which run at the same hardware frequency: 0 1 2 3
CPUs which need to have their frequency coordinated by software: 0 1 2 3
maximum transition latency: 500 us.
hardware limits: 300 MHz - 1.20 GHz
available frequency steps: 300 MHz, 400 MHz, 600 MHz, 1.20 GHz
available cpufreq governors: performance
current policy: frequency should be within 300 MHz and 1.20 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 1.20 GHz.
cpufreq stats: 300 MHz:0.00%, 400 MHz:0.00%, 600 MHz:0.00%, 1.20 GHz:100.00%

Answer 1

How can I know is this CPU supports 256bit vector
It doesn't.
It supports NEON (the asimd entry in the Features list) which is 128-bit only.