From: Milan Tripkovic <Milan.Tripkovic@rt-rk.com>

Add an optimized assembly implementation of memchr() for RISC-V.
The implementation uses word-aligned loads and Zbb optimizations where
available, with a fallback for non-Zbb hardware.

The series also includes KUnit tests for functional verification 
and performance benchmarking.

Signed-off-by: Milan Tripkovic <Milan.Tripkovic@rt-rk.com>

Milan Tripkovic (2):
  riscv: lib: add memchr() implementation
  lib/string_kunit: extend benchmarks and unit test to memchr()

 arch/riscv/include/asm/string.h |   3 +-
 arch/riscv/lib/Makefile         |   1 +
 arch/riscv/lib/memchr.S         | 126 ++++++++++++++++++++++++++++++++
 arch/riscv/purgatory/Makefile   |   5 +-
 lib/tests/string_kunit.c        |  53 ++++++++++++++
 5 files changed, 186 insertions(+), 2 deletions(-)
 create mode 100644 arch/riscv/lib/memchr.S

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2.43.0