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18be4ca5cb
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>
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|---|---|---|
| .. | ||
| clear_page.S | ||
| csum.c | ||
| delay.c | ||
| error-inject.c | ||
| Makefile | ||
| memcpy.S | ||
| memmove.S | ||
| memset.S | ||
| riscv_v_helpers.c | ||
| strcmp.S | ||
| strlen.S | ||
| strncmp.S | ||
| tishift.S | ||
| uaccess.S | ||
| uaccess_vector.S | ||
| xor.S | ||