user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<composite_subimage_sf>:
  endbr64
  push   %r15
  push   %r14
  mov    %esi,%r14d
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %edi,-0x14(%rsp)
  mov    %esi,-0x18(%rsp)
  test   %esi,%esi
  jle    L17
  mov    %rcx,%rbx
  mov    %rdx,%rsi
  lea    0x2f(%rdx),%rdx
  movslq %r14d,%rcx
  sub    %r8,%rdx
  lea    (%rcx,%rcx,2),%rax
  lea    0x8(%rbx),%rdi
  shl    $0x3,%rax
  cmp    $0x5e,%rdx
  lea    0x0(,%rcx,8),%rbp
  seta   %dl
  lea    (%r8,%rax,1),%r10
  lea    (%r9,%rbp,1),%r11
  cmp    %rdi,%r9
  setne  %dil
  and    %edi,%edx
  cmp    $0x1,%r14d
  setne  %dil
  and    %edx,%edi
  lea    (%rbx,%rbp,1),%rdx
  cmp    %rdx,%r8
  setae  %dl
  cmp    %r10,%rbx
  setae  %bpl
  add    %rsi,%rax
  or     %ebp,%edx
  and    %edi,%edx
  cmp    %rax,%r9
  setae  %al
  cmp    %r11,%rsi
  setae  %dil
  or     %edi,%eax
  test   %al,%dl
  je     L53
  cmp    %r11,%r8
  setae  %al
  cmp    %r10,%r9
  setae  %dl
  or     %dl,%al
  je     L53
  shr    %r14d
  mov    %rsi,%rdx
  mov    %r8,%rax
  mov    %rbx,%rdi
  mov    %r14d,%r11d
  mov    %r9,%r10
  sub    $0x1,%r11d
  shl    $0x4,%r11
  lea    0x10(%rbx,%r11,1),%r11
  nopl   0x0(%rax)
L37:
  movupd (%rdx),%xmm2
  add    $0x10,%rdi
  add    $0x30,%rdx
  add    $0x30,%rax
  movupd -0x20(%rdx),%xmm1
  movupd -0x10(%rdx),%xmm0
  add    $0x10,%r10
  movups %xmm2,-0x30(%rax)
  movups %xmm1,-0x20(%rax)
  movups %xmm0,-0x10(%rax)
  movupd -0x10(%rdi),%xmm3
  movups %xmm3,-0x10(%r10)
  cmp    %r11,%rdi
  jne    L37
  mov    -0x18(%rsp),%eax
  mov    %eax,%edx
  and    $0xfffffffe,%edx
  test   $0x1,%al
  je     L102
  lea    (%rdx,%rdx,2),%eax
  cltq
  movsd  (%rsi,%rax,8),%xmm0
  movsd  %xmm0,(%r8,%rax,8)
  add    $0x1,%rax
  movsd  (%rsi,%rax,8),%xmm0
  lea    0x0(,%rax,8),%rdi
  movsd  %xmm0,(%r8,%rax,8)
  movsd  0x8(%rsi,%rdi,1),%xmm0
  movsd  %xmm0,0x8(%r8,%rdi,1)
  movsd  (%rbx,%rdx,8),%xmm0
  movsd  %xmm0,(%r9,%rdx,8)
L102:
  cmpl   $0x1,-0x14(%rsp)
  jle    L17
  mov    -0x18(%rsp),%r13d
  lea    0x0(,%rcx,8),%rax
  mov    $0x1,%r14d
  mov    %rax,-0x10(%rsp)
  add    %rax,%rbx
  lea    0x0(%r13,%r13,2),%r15d
  mov    %r15d,%r12d
  lea    (%r15,%r15,1),%ebp
  neg    %r12d
  nopw   0x0(%rax,%rax,1)
L50:
  lea    0x0(%r13,%r13,2),%edx
  xor    %eax,%eax
  nopw   0x0(%rax,%rax,1)
L80:
  movsd  (%rbx,%rax,1),%xmm0
  movsd  (%r9,%rax,1),%xmm1
  comisd %xmm0,%xmm1
  jbe    L14
  movslq %edx,%r10
  movsd  %xmm0,(%r9,%rax,1)
  lea    (%rdx,%r12,1),%ecx
  movsd  (%rsi,%r10,8),%xmm0
  lea    0x0(,%r10,8),%rdi
  movslq %ecx,%rcx
  lea    0x0(,%rcx,8),%r11
  movsd  %xmm0,(%r8,%rcx,8)
  movsd  0x8(%rsi,%rdi,1),%xmm0
  movsd  %xmm0,0x8(%r8,%r11,1)
  movsd  0x10(%rsi,%rdi,1),%xmm0
  movsd  %xmm0,0x10(%r8,%r11,1)
L14:
  add    $0x3,%edx
  add    $0x8,%rax
  cmp    %ebp,%edx
  jne    L80
  add    $0x1,%r14d
  add    %r15d,%ebp
  add    -0x18(%rsp),%r13d
  sub    %r15d,%r12d
  add    -0x10(%rsp),%rbx
  cmp    %r14d,-0x14(%rsp)
  jne    L50
L17:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L53:
  mov    %rsi,%rdi
  mov    %r8,%rdx
  xor    %eax,%eax
  nopl   0x0(%rax)
L0:
  movsd  (%rdi),%xmm0
  add    $0x18,%rdx
  add    $0x18,%rdi
  movsd  %xmm0,-0x18(%rdx)
  movsd  -0x10(%rdi),%xmm0
  movsd  %xmm0,-0x10(%rdx)
  movsd  -0x8(%rdi),%xmm0
  movsd  %xmm0,-0x8(%rdx)
  movsd  (%rbx,%rax,8),%xmm0
  movsd  %xmm0,(%r9,%rax,8)
  add    $0x1,%rax
  cmp    %rcx,%rax
  jne    L0
  jmp    L102
```

assistant: ```c
void composite_subimage_sf(int pesize, int pixn, double *n_subimage, double *n_subopa, double *subimage, double *subopa) {
  int i, j;
  for (j = 0; j < pixn; j++) {
    subimage[j * 3 + 0] = n_subimage[j * 3 + 0];
    subimage[j * 3 + 1] = n_subimage[j * 3 + 1];
    subimage[j * 3 + 2] = n_subimage[j * 3 + 2];
    subopa[j] = n_subopa[j];
  }
  for (i = 1; i < pesize; i++) {
    for (j = 0; j < pixn; j++) {
      if (n_subopa[i * pixn + j] < subopa[j]) {
        subopa[j] = n_subopa[i * pixn + j];
        subimage[j * 3] = n_subimage[i * pixn * 3 + j * 3 + 0];
        subimage[j * 3 + 1] = n_subimage[i * pixn * 3 + j * 3 + 1];
        subimage[j * 3 + 2] = n_subimage[i * pixn * 3 + j * 3 + 2];
      }
    }
  }
  return;
}
```