diff options
| author |   Feng Jiang <jiangfeng@kylinos.cn> | 2026-01-25 21:09:58 -0700 |
|---|---|---|
| committer |   Paul Walmsley <pjw@kernel.org> | 2026-02-09 15:27:33 -0700 |
| commit | 18be4ca5cb4e5a86833de97d331f5bc14a6c5a6d (patch) | |
| tree | 47e35ff53c678798ffb96b03d8e72405a350ccd7 /tools/testing/selftests/dm-verity/git:/ssh:/git@git.zx2c4.com | |
| parent | selftests: riscv: vstate_exec_nolibc: Use the regular prctl() function (diff) | |
riscv: lib: optimize strlen loop efficiency
Optimize the generic strlen implementation by using a pre-decrement
pointer. This reduces the loop body from 4 instructions to 3 and
eliminates the unconditional jump ('j').
Old loop (4 instructions, 2 branches):
1: lbu t0, 0(t1); beqz t0, 2f; addi t1, t1, 1; j 1b
New loop (3 instructions, 1 branch):
1: addi t1, t1, 1; lbu t0, 0(t1); bnez t0, 1b
This change improves execution efficiency and reduces branch pressure
for systems without the Zbb extension.
Signed-off-by: Feng Jiang <jiangfeng@kylinos.cn>
Link: https://patch.msgid.link/20251218032614.57356-1-jiangfeng@kylinos.cn
Signed-off-by: Paul Walmsley <pjw@kernel.org>
Diffstat (limited to 'tools/testing/selftests/dm-verity/git:/ssh:/git@git.zx2c4.com')
0 files changed, 0 insertions, 0 deletions