src/string/x86_64/memcpy.s

   1 .global memcpy
   2 .global __memcpy_fwd
   3 .hidden __memcpy_fwd
   4 .type memcpy,@function
   5 memcpy:
   6 __memcpy_fwd:
   7         mov %rdi,%rax
   8         cmp $8,%rdx
   9         jc 1f
  10         test $7,%edi
  11         jz 1f
  12 2:      movsb
  13         dec %rdx
  14         test $7,%edi
  15         jnz 2b
  16 1:      mov %rdx,%rcx
  17         shr $3,%rcx
  18         rep
  19         movsq
  20         and $7,%edx
  21         jz 1f
  22 2:      movsb
  23         dec %edx
  24         jnz 2b
  25 1:      ret