[openssl/openssl] da8b63: Use scalar ALU and vector ALU together for chacha2...

[Jerry Shih]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: da8b6308bd7ad5b7c779aa2d9123bf5faacaec7f
      https://github.com/openssl/openssl/commit/da8b6308bd7ad5b7c779aa2d9123bf5faacaec7f
  Author: Jerry Shih <bignose1007 at gmail.com>
  Date:   2024-04-17 (Wed, 17 Apr 2024)

  Changed paths:
    A crypto/chacha/asm/chacha-riscv64-zbb-zvkb.pl
    R crypto/chacha/asm/chacha-riscv64-zvkb.pl
    M crypto/chacha/build.info
    M crypto/chacha/chacha_riscv.c
    M crypto/perlasm/riscv.pm

  Log Message:
  -----------
  Use scalar ALU and vector ALU together for chacha20 stream cipher

Fixes #24070

Use scalar ALU for 1 chacha block with rvv ALU simultaneously.
The tail elements(non-multiple of block length) will be handled by
the scalar logic.

Use rvv path if the input length > chacha_block_size.

And we have about 1.2x improvement comparing with the original code.

Reviewed-by: Hongren Zheng <i at zenithal.me>
Reviewed-by: Paul Dale <ppzgs1 at gmail.com>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24097)



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