| 0,0 → 1,40 |
|---|
| /* Copyright (C) 1999 DJ Delorie, see COPYING.DJ for details */ |
| /* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */ |
| # This routine moves %ecx bytes from %ds:%esi to %es:%edi. It clobbers |
| # %eax, %ecx, %esi, %edi, and eflags. The memory ranges must not overlap, |
| # unless %esi >= %edi. |
| #include <libc/asmdefs.h> |
| #include<libc/asm.h> |
| |
| .file "djmd.s" |
| .text |
| .balign 16,,7 |
| |
| MK_C_SYM(__dj_movedata) |
| cmpl $15,%ecx |
| jle small_move |
| jmp mod_4_check |
| |
| # Transfer bytes until either %esi or %edi is aligned % 4 |
| align_mod_4: |
| movsb |
| decl %ecx |
| mod_4_check: |
| testl $3,%esi |
| jz big_move |
| testl $3,%edi |
| jnz align_mod_4 |
| |
| big_move: |
| movb %cl,%al # We will store leftover count in %al |
| shrl $2,%ecx |
| andb $3,%al |
| rep |
| movsl |
| |
| # %ecx known to be zero here, so insert the leftover count in %al |
| movb %al,%cl |
| small_move: |
| rep |
| movsb |
| ret |