user: What is the c source code of the assembly code below?

```asm
<merge>:
  endbr64
  lea    (%rsi,%rcx,1),%r11d
  mov    %esi,%r9d
  test   %r11d,%r11d
  jle    L123
  push   %r15
  mov    %rdx,%rsi
  xor    %eax,%eax
  xor    %edx,%edx
  push   %r14
  xor    %r10d,%r10d
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  jmp    L251
  nopw   0x0(%rax,%rax,1)
L184:
  cmp    %ecx,%edx
  je     L198
L185:
  cmp    %r11d,%eax
  jge    L46
L251:
  movslq %r10d,%r13
  movslq %edx,%r12
  shl    $0x2,%r13
  shl    $0x2,%r12
  lea    (%rdi,%r13,1),%r14
  lea    (%rsi,%r12,1),%r15
  mov    (%r14),%ebx
  mov    (%r15),%ebp
  cmp    %ebp,%ebx
  jge    L28
  movslq %eax,%rbp
  lea    0x4(%rdi,%r13,1),%r14
  add    $0x1,%r10d
  add    $0x1,%eax
  mov    %ebx,(%r8,%rbp,4)
  mov    (%r15),%ebp
  mov    (%r14),%ebx
L28:
  cmp    %ebx,%ebp
  jge    L75
  movslq %eax,%rbx
  lea    0x4(%rsi,%r12,1),%r15
  add    $0x1,%edx
  add    $0x1,%eax
  mov    %ebp,(%r8,%rbx,4)
  mov    (%r14),%ebx
  mov    (%r15),%ebp
L75:
  cmp    %ebp,%ebx
  jne    L135
  movslq %eax,%rbp
  add    $0x1,%r10d
  add    $0x1,%edx
  add    $0x2,%eax
  mov    %ebx,(%r8,%rbp,4)
  mov    (%r15),%ebx
  mov    %ebx,0x4(%r8,%rbp,4)
L135:
  cmp    %r9d,%r10d
  jne    L184
  cmp    %ecx,%edx
  je     L230
  movslq %eax,%r13
  movslq %edx,%rbx
  mov    %ecx,%r12d
  lea    0x1(%rbx),%r14
  shl    $0x2,%r13
  sub    %edx,%r12d
  mov    %r14,-0x10(%rsp)
  lea    (%r8,%r13,1),%rbp
  shl    $0x2,%r14
  lea    (%rsi,%r14,1),%r15
  mov    %rbp,%r10
  sub    %r15,%r10
  cmp    $0x8,%r10
  jbe    L9
  lea    -0x1(%r12),%r15d
  cmp    $0x2,%r15d
  jbe    L9
  mov    %r12d,%ebx
  lea    -0x4(%rsi,%r14,1),%r13
  xor    %r10d,%r10d
  shr    $0x2,%ebx
  shl    $0x4,%rbx
  nopw   0x0(%rax,%rax,1)
L39:
  movdqu 0x0(%r13,%r10,1),%xmm0
  movups %xmm0,0x0(%rbp,%r10,1)
  add    $0x10,%r10
  cmp    %r10,%rbx
  jne    L39
  mov    %r12d,%r10d
  and    $0xfffffffc,%r10d
  add    %r10d,%edx
  lea    (%r10,%rax,1),%ebx
  cmp    %r12d,%r10d
  je     L101
  movslq %edx,%r13
  lea    0x1(%rbx),%ebp
  lea    0x1(%rdx),%r10d
  movslq %ebx,%rbx
  mov    (%rsi,%r13,4),%r13d
  mov    %r13d,(%r8,%rbx,4)
  cmp    %ecx,%r10d
  je     L101
  movslq %r10d,%r10
  movslq %ebp,%rbx
  add    $0x2,%edx
  lea    0x0(,%r10,4),%r13
  mov    (%rsi,%r10,4),%r10d
  lea    0x0(,%rbx,4),%rbp
  mov    %r10d,(%r8,%rbx,4)
  cmp    %ecx,%edx
  je     L101
  mov    0x4(%rsi,%r13,1),%edx
  mov    %edx,0x4(%r8,%rbp,1)
L101:
  add    %r12d,%eax
L230:
  mov    %ecx,%edx
  mov    %r9d,%r10d
  cmp    %r11d,%eax
  jl     L251
L46:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  xchg   %ax,%ax
L9:
  mov    %rbx,%rdx
  mov    -0x10(%rsp),%r10
  neg    %rdx
  lea    0x0(%r13,%rdx,4),%rbp
  add    %r8,%rbp
  jmp    L253
  nopl   (%rax)
L158:
  add    $0x1,%r10
L253:
  mov    (%rsi,%rbx,4),%edx
  mov    %edx,0x0(%rbp,%rbx,4)
  mov    %r10,%rbx
  cmp    %r10d,%ecx
  jne    L158
  jmp    L101
L123:
  ret
L198:
  movslq %eax,%r13
  movslq %r10d,%rbx
  mov    %r9d,%r12d
  lea    0x1(%rbx),%rdx
  shl    $0x2,%r13
  sub    %r10d,%r12d
  lea    0x0(,%rdx,4),%r14
  lea    (%r8,%r13,1),%rbp
  mov    %rdx,-0x10(%rsp)
  lea    (%rdi,%r14,1),%r15
  mov    %rbp,%rdx
  sub    %r15,%rdx
  cmp    $0x8,%rdx
  jbe    L236
  lea    -0x1(%r12),%r15d
  cmp    $0x2,%r15d
  jbe    L236
  mov    %r12d,%ebx
  lea    -0x4(%rdi,%r14,1),%r13
  xor    %edx,%edx
  shr    $0x2,%ebx
  shl    $0x4,%rbx
  nopw   0x0(%rax,%rax,1)
L219:
  movdqu 0x0(%r13,%rdx,1),%xmm1
  movups %xmm1,0x0(%rbp,%rdx,1)
  add    $0x10,%rdx
  cmp    %rdx,%rbx
  jne    L219
  mov    %r12d,%edx
  and    $0xfffffffc,%edx
  add    %edx,%r10d
  lea    (%rax,%rdx,1),%ebp
  cmp    %edx,%r12d
  je     L41
  movslq %r10d,%r13
  lea    0x1(%rbp),%ebx
  lea    0x1(%r10),%edx
  movslq %ebp,%rbp
  mov    (%rdi,%r13,4),%r13d
  mov    %r13d,(%r8,%rbp,4)
  cmp    %edx,%r9d
  je     L41
  movslq %edx,%rdx
  movslq %ebx,%rbx
  add    $0x2,%r10d
  lea    0x0(,%rdx,4),%r13
  mov    (%rdi,%rdx,4),%edx
  lea    0x0(,%rbx,4),%rbp
  mov    %edx,(%r8,%rbx,4)
  cmp    %r10d,%r9d
  je     L41
  mov    0x4(%rdi,%r13,1),%edx
  mov    %edx,0x4(%r8,%rbp,1)
L41:
  add    %r12d,%eax
  mov    %ecx,%edx
  mov    %r9d,%r10d
  jmp    L185
L236:
  imul   $0xfffffffffffffffc,%rbx,%rbp
  mov    -0x10(%rsp),%rdx
  add    %r13,%rbp
  add    %r8,%rbp
  jmp    L124
  xchg   %ax,%ax
L30:
  add    $0x1,%rdx
L124:
  mov    (%rdi,%rbx,4),%r10d
  mov    %r10d,0x0(%rbp,%rbx,4)
  mov    %rdx,%rbx
  cmp    %edx,%r9d
  jne    L30
  add    %r12d,%eax
  mov    %ecx,%edx
  mov    %r9d,%r10d
  jmp    L185
```

assistant: ```c
void merge(int A1[], int l1, int A2[], int l2, int A[]) {
  int i = 0, j = 0, count = 0;
  while (count < l1 + l2) {
    if (A1[i] < A2[j])
      A[count++] = A1[i++];
    if (A2[j] < A1[i])
      A[count++] = A2[j++];
    if (A1[i] == A2[j]) {
      A[count++] = A1[i++];
      A[count++] = A2[j++];
    }
    if (i == l1) {
      while (j != l2)
        A[count++] = A2[j++];
    }
    if (j == l2) {
      while (i != l1)
        A[count++] = A1[i++];
    }
  }
}
```