Aarch64 ISA additions (SM3, SM4, SHA3)

[Jeffrey Walton]

Hi Everyone,

I was looking through
https://gcc.gnu.org/onlinedocs/gcc/AArch64-Options.html. I see GCC
added support for SM3, SM4, and SHA3. Awesome job.

I have a few questions:

  * What versions of GCC offer SM3, SM4 and SHA3?

  * What is AES and SHA2? How is it different from +crypto?

  * Can we now use, say, -march=armv8.4-a+aes or -march=armv8.4-a+sha2
instead of -march=armv8-a+crypto?

Jeff