user: 这段汇编代码用C语言表示是什么样的：

```asm
<merge>:
  endbr64
  push   %r15
  mov    %rsi,%r10
  mov    %rcx,%r9
  mov    %edx,%esi
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  test   %edx,%edx
  jle    L37
  test   %r8d,%r8d
  jle    L37
  mov    $0x1,%r11d
  xor    %eax,%eax
  xor    %edx,%edx
  xor    %r13d,%r13d
  xor    %r12d,%r12d
  nop
L63:
  mov    (%r10,%r13,4),%ebp
  mov    (%r9,%r12,4),%ebx
  mov    %r11d,%ecx
  cmp    %ebp,%ebx
  jle    L58
L239:
  mov    %ebp,-0x4(%rdi,%r11,4)
  add    $0x1,%edx
  add    $0x1,%r11
  cmp    %eax,%r8d
  jle    L53
  cmp    %edx,%esi
  jle    L45
  movslq %edx,%r13
  mov    (%r9,%r12,4),%ebx
  mov    %r11d,%ecx
  mov    (%r10,%r13,4),%ebp
  cmp    %ebp,%ebx
  jg     L239
L58:
  mov    %ebx,-0x4(%rdi,%r11,4)
  add    $0x1,%eax
  add    $0x1,%r11
  cmp    %edx,%esi
  jle    L45
  cmp    %eax,%r8d
  jle    L53
  movslq %eax,%r12
  jmp    L63
  nopl   0x0(%rax,%rax,1)
L37:
  xor    %ecx,%ecx
  xor    %eax,%eax
  xor    %edx,%edx
  cs nopw 0x0(%rax,%rax,1)
L53:
  cmp    %edx,%esi
  jle    L45
  movslq %ecx,%r13
  movslq %edx,%rbx
  mov    %esi,%r12d
  lea    0x1(%rbx),%r14
  shl    $0x2,%r13
  sub    %edx,%r12d
  mov    %r14,-0x10(%rsp)
  lea    (%rdi,%r13,1),%rbp
  shl    $0x2,%r14
  lea    (%r10,%r14,1),%r15
  mov    %rbp,%r11
  sub    %r15,%r11
  cmp    $0x8,%r11
  jbe    L186
  lea    -0x1(%r12),%r15d
  cmp    $0x2,%r15d
  jbe    L186
  mov    %r12d,%ebx
  lea    -0x4(%r10,%r14,1),%r13
  xor    %r11d,%r11d
  shr    $0x2,%ebx
  shl    $0x4,%rbx
  xchg   %ax,%ax
L211:
  movdqu 0x0(%r13,%r11,1),%xmm0
  movups %xmm0,0x0(%rbp,%r11,1)
  add    $0x10,%r11
  cmp    %rbx,%r11
  jne    L211
  mov    %r12d,%r11d
  and    $0xfffffffc,%r11d
  add    %r11d,%edx
  lea    (%rcx,%r11,1),%ebx
  cmp    %r11d,%r12d
  je     L139
  movslq %edx,%r13
  lea    0x1(%rbx),%ebp
  lea    0x1(%rdx),%r11d
  movslq %ebx,%rbx
  mov    (%r10,%r13,4),%r13d
  mov    %r13d,(%rdi,%rbx,4)
  cmp    %r11d,%esi
  jle    L139
  movslq %r11d,%r11
  movslq %ebp,%rbx
  add    $0x2,%edx
  lea    0x0(,%r11,4),%r13
  mov    (%r10,%r11,4),%r11d
  lea    0x0(,%rbx,4),%rbp
  mov    %r11d,(%rdi,%rbx,4)
  cmp    %edx,%esi
  jle    L139
  mov    0x4(%r10,%r13,1),%edx
  mov    %edx,0x4(%rdi,%rbp,1)
L139:
  add    %r12d,%ecx
L45:
  cmp    %eax,%r8d
  jle    L166
  movslq %ecx,%r11
  movslq %eax,%rsi
  mov    %r8d,%ebx
  shl    $0x2,%r11
  lea    0x1(%rsi),%rdx
  sub    %eax,%ebx
  lea    (%rdi,%r11,1),%r10
  lea    0x0(,%rdx,4),%rbp
  lea    (%r9,%rbp,1),%r13
  mov    %r10,%r12
  sub    %r13,%r12
  cmp    $0x8,%r12
  jbe    L219
  lea    -0x1(%rbx),%r12d
  cmp    $0x2,%r12d
  jbe    L219
  mov    %ebx,%esi
  lea    -0x4(%r9,%rbp,1),%r11
  xor    %edx,%edx
  shr    $0x2,%esi
  shl    $0x4,%rsi
  xchg   %ax,%ax
L62:
  movdqu (%r11,%rdx,1),%xmm1
  movups %xmm1,(%r10,%rdx,1)
  add    $0x10,%rdx
  cmp    %rdx,%rsi
  jne    L62
  mov    %ebx,%edx
  and    $0xfffffffc,%edx
  add    %edx,%eax
  add    %edx,%ecx
  cmp    %edx,%ebx
  je     L166
  movslq %eax,%r10
  lea    0x1(%rcx),%esi
  lea    0x1(%rax),%edx
  movslq %ecx,%rcx
  mov    (%r9,%r10,4),%r10d
  mov    %r10d,(%rdi,%rcx,4)
  cmp    %edx,%r8d
  jle    L166
  movslq %edx,%rdx
  movslq %esi,%rcx
  add    $0x2,%eax
  lea    0x0(,%rdx,4),%r10
  mov    (%r9,%rdx,4),%edx
  lea    0x0(,%rcx,4),%rsi
  mov    %edx,(%rdi,%rcx,4)
  cmp    %r8d,%eax
  jge    L166
  mov    0x4(%r9,%r10,1),%eax
  mov    %eax,0x4(%rdi,%rsi,1)
L166:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax,%rax,1)
L186:
  mov    %rbx,%rdx
  mov    -0x10(%rsp),%r11
  neg    %rdx
  lea    0x0(%r13,%rdx,4),%rbp
  add    %rdi,%rbp
  jmp    L117
  nopl   (%rax)
L112:
  add    $0x1,%r11
L117:
  mov    (%r10,%rbx,4),%edx
  mov    %edx,0x0(%rbp,%rbx,4)
  mov    %r11,%rbx
  cmp    %r11d,%esi
  jg     L112
  add    %r12d,%ecx
  jmp    L45
  nopl   0x0(%rax)
L219:
  mov    %rsi,%rax
  neg    %rax
  lea    (%r11,%rax,4),%rax
  add    %rax,%rdi
  jmp    L151
  nop
L39:
  add    $0x1,%rdx
L151:
  mov    (%r9,%rsi,4),%eax
  mov    %eax,(%rdi,%rsi,4)
  mov    %rdx,%rsi
  cmp    %edx,%r8d
  jg     L39
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void merge(int *A, int *L, int leftcount, int *R, int rightcount) {
  int i = 0, j = 0, k = 0;
  while (i < leftcount && j < rightcount) {
    if (L[i] < R[j])
      A[k++] = L[i++];
    else
      A[k++] = R[j++];
  }
  while (i < leftcount)
    A[k++] = L[i++];
  while (j < rightcount)
    A[k++] = R[j++];
}
```