From 4abab5ad6c8465a7528ccdd5f49367da05f78bbd Mon Sep 17 00:00:00 2001 From: Vladimir Azarov Date: Tue, 1 Oct 2024 15:47:05 +0200 Subject: Initial version --- src/string/x86_64/memcpy.s | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 src/string/x86_64/memcpy.s (limited to 'src/string/x86_64/memcpy.s') diff --git a/src/string/x86_64/memcpy.s b/src/string/x86_64/memcpy.s new file mode 100644 index 0000000..3d960ef --- /dev/null +++ b/src/string/x86_64/memcpy.s @@ -0,0 +1,25 @@ +.global memcpy +.global __memcpy_fwd +.hidden __memcpy_fwd +.type memcpy,@function +memcpy: +__memcpy_fwd: + mov %rdi,%rax + cmp $8,%rdx + jc 1f + test $7,%edi + jz 1f +2: movsb + dec %rdx + test $7,%edi + jnz 2b +1: mov %rdx,%rcx + shr $3,%rcx + rep + movsq + and $7,%edx + jz 1f +2: movsb + dec %edx + jnz 2b +1: ret -- cgit v1.2.3