string/strcpy.s

   1  .text
   2 .globl strcpy
   3 .type strcpy,@function
   4 .align 1<<4
   5 strcpy:
   6  movq %rsi, %rcx
   7  andl $7, %ecx
   8  movq %rdi, %rdx
   9  jz 5f
  10  neg %ecx
  11  addl $8,%ecx
  12 0:
  13  movb (%rsi), %al
  14  testb %al, %al
  15  movb %al, (%rdx)
  16  jz 4f
  17  incq %rsi
  18  incq %rdx
  19  decl %ecx
  20  jnz 0b
  21 5:
  22  movq $0xfefefefefefefeff,%r8
  23  .p2align 4
  24 1:
  25  movq (%rsi), %rax
  26  addq $8, %rsi
  27  movq %rax, %r9
  28  addq %r8, %r9
  29  jnc 3f
  30  xorq %rax, %r9
  31  orq %r8, %r9
  32  incq %r9
  33  jnz 3f
  34  movq %rax, (%rdx)
  35  addq $8, %rdx
  36  movq (%rsi), %rax
  37  addq $8, %rsi
  38  movq %rax, %r9
  39  addq %r8, %r9
  40  jnc 3f
  41  xorq %rax, %r9
  42  orq %r8, %r9
  43  incq %r9
  44  jnz 3f
  45  movq %rax, (%rdx)
  46  addq $8, %rdx
  47  movq (%rsi), %rax
  48  addq $8, %rsi
  49  movq %rax, %r9
  50  addq %r8, %r9
  51  jnc 3f
  52  xorq %rax, %r9
  53  orq %r8, %r9
  54  incq %r9
  55  jnz 3f
  56  movq %rax, (%rdx)
  57  addq $8, %rdx
  58  movq (%rsi), %rax
  59  addq $8, %rsi
  60  movq %rax, %r9
  61  addq %r8, %r9
  62  jnc 3f
  63  xorq %rax, %r9
  64  orq %r8, %r9
  65  incq %r9
  66  jnz 3f
  67  movq %rax, (%rdx)
  68  addq $8, %rdx
  69  jmp 1b
  70  .p2align 4
  71 3:
  72  movb %al, (%rdx)
  73  testb %al, %al
  74  jz 4f
  75  incq %rdx
  76  movb %ah, (%rdx)
  77  testb %ah, %ah
  78  jz 4f
  79  incq %rdx
  80  shrq $16, %rax
  81  jmp 3b
  82 4:
  83  movq %rdi, %rax
  84  retq
  85 .size strcpy,.-strcpy
  86