diff options
| author | Mikhail Osipov <mike.osipov@gmail.com> | 2019-10-12 00:23:50 +0300 |
|---|---|---|
| committer | Mikhail Osipov <mike.osipov@gmail.com> | 2019-10-12 00:23:50 +0300 |
| commit | 2d78510b9af6f70ec34d77f0e047c698bdf061a9 (patch) | |
| tree | f56f2c9d7c29952748d62aa99d6e8fdc76402ada /string.s | |
| parent | 1248eae0617555a4f13f7bbee9f120ad3d46c5f3 (diff) | |
draftng
Diffstat (limited to 'string.s')
| -rw-r--r-- | string.s | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/string.s b/string.s new file mode 100644 index 0000000..b6bc317 --- /dev/null +++ b/string.s @@ -0,0 +1,21 @@ +.include "lib.s" + +.globl strlen +strlen: + prologue + + backup %rdi, %rcx + + movq 16(%rbp), %rdi + xorq %rax, %rax + movq $-1, %rcx + + repne scasb + + movq $-2, %rax + subq %rcx, %rax + + restore %rdi, %rcx + + leave + ret |