user: 请显示与下面列出的汇编代码相匹配的C语言实现：

```asm
<line_copyf>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  movslq %edx,%r12
  push   %rbp
  lea    0x0(,%r12,4),%edx
  mov    %ecx,%ebp
  push   %rbx
  mov    %rdi,%rbx
  sub    $0x18,%rsp
  call   <memcpy@plt>
  test   %ebp,%ebp
  jle    L54
  movslq %ebp,%r8
  mov    %r12,%rdi
  lea    -0x1(%r12),%eax
  mov    %ebp,%r10d
  mov    %r8,%rdx
  lea    0x8(,%r12,4),%r9
  lea    (%r12,%r8,1),%rcx
  sub    %r8,%rdi
  neg    %rdx
  shl    $0x2,%rcx
  lea    0x4(,%r8,4),%r15
  lea    0x0(,%rdi,4),%r11
  shl    $0x2,%rdx
  cmp    $0x8,%r9
  mov    %r15,0x8(%rsp)
  lea    -0x4(%r11),%rsi
  seta   %r13b
  cmp    $0x1,%ebp
  mov    %rdx,%r15
  setne  %r9b
  and    %r9d,%r13d
  add    %rcx,%r15
  setns  %r9b
  cmp    %rdx,%rcx
  setle  %r14b
  or     %r14d,%r9d
  and    %r13d,%r9d
  lea    0x10(%rdx),%r13
  cmp    %r13,%rsi
  setge  %r13b
  add    $0xc,%r11
  cmp    %r11,%rdx
  setge  %r11b
  or     %r11d,%r13d
  test   %r13b,%r9b
  je     L1
  lea    (%r8,%rdi,1),%r9
  lea    -0x4(,%r9,4),%r9
  cmp    %r9,%r15
  setge  %r9b
  cmp    %rsi,%rcx
  setle  %r11b
  or     %r11b,%r9b
  je     L1
  cmp    $0x3,%ebp
  jle    L13
  mov    %rbx,%r8
  mov    %ebp,%r11d
  lea    (%rbx,%rdx,1),%r12
  add    %rbx,%rsi
  sub    %rdx,%r8
  shr    $0x2,%r11d
  lea    -0x10(%rbx,%rcx,1),%r13
  xor    %r9d,%r9d
  lea    -0xc(%r8),%r14
  shl    $0x4,%r11
  xor    %r8d,%r8d
  nopl   0x0(%rax)
L18:
  movups (%r14,%r9,1),%xmm0
  shufps $0x1b,%xmm0,%xmm0
  movups %xmm0,(%r12,%r8,1)
  movups (%rsi,%r8,1),%xmm0
  add    $0x10,%r8
  shufps $0x1b,%xmm0,%xmm0
  movups %xmm0,0x0(%r13,%r9,1)
  sub    $0x10,%r9
  cmp    %r11,%r8
  jne    L18
  mov    %ebp,%esi
  and    $0xfffffffc,%esi
  sub    %esi,%ebp
  cmp    %esi,%r10d
  je     L54
  sub    %esi,%r10d
  cmp    $0x1,%r10d
  je     L84
L21:
  mov    %rsi,%r8
  lea    0x0(,%rsi,4),%r9
  add    %rsi,%rdi
  sub    $0x8,%rcx
  not    %r8
  sub    %r9,%rcx
  shl    $0x2,%r8
  sub    %rdx,%r8
  mov    %r10d,%edx
  movq   (%rbx,%r8,1),%xmm0
  and    $0xfffffffe,%edx
  sub    %edx,%ebp
  shufps $0xe1,%xmm0,%xmm0
  movlps %xmm0,(%r12,%r9,1)
  movq   -0x4(%rbx,%rdi,4),%xmm0
  shufps $0xe1,%xmm0,%xmm0
  movlps %xmm0,(%rbx,%rcx,1)
  cmp    %edx,%r10d
  je     L54
L84:
  movslq %ebp,%rdx
  movss  (%rbx,%rdx,4),%xmm0
  lea    0x0(,%rdx,4),%rcx
  mov    %rbx,%rdx
  sub    %rcx,%rdx
  movss  %xmm0,(%rdx)
  mov    %eax,%edx
  add    %ebp,%eax
  sub    %ebp,%edx
  cltq
  movslq %edx,%rdx
  movss  (%rbx,%rdx,4),%xmm0
  movss  %xmm0,(%rbx,%rax,4)
L54:
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopw   0x0(%rax,%rax,1)
L1:
  mov    0x8(%rsp),%rax
  lea    -0x1(%rbp),%ecx
  add    %rbx,%rdx
  sub    %r8,%rcx
  lea    -0x4(%rbx,%rax,1),%rax
  lea    0x4(%rbx,%rcx,4),%rcx
L14:
  movss  (%rax),%xmm0
  movss  %xmm0,(%rdx)
  movss  -0x4(%rdx,%r12,4),%xmm0
  add    $0x4,%rdx
  movss  %xmm0,-0x4(%rax,%r12,4)
  sub    $0x4,%rax
  cmp    %rcx,%rdx
  jne    L14
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L13:
  xor    %esi,%esi
  lea    (%rbx,%rdx,1),%r12
  jmp    L21
```

assistant: ```c
void line_copyf(float *line, const float *srcp, int width, int mergin) {
  memcpy(line, srcp, width * sizeof(float));
  for (int i = mergin; i > 0; i--) {
    line[-i] = line[i];
    line[width - 1 + i] = line[width - 1 - i];
  }
}
```