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

```asm
<merge>:
  endbr64
  mov    %rdi,%r10
  mov    %esi,%edi
  push   %r15
  mov    %rdx,%r9
  push   %r14
  mov    %ecx,%esi
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  test   %edi,%edi
  jle    L202
  test   %ecx,%ecx
  jle    L202
  mov    $0x1,%r11d
  xor    %eax,%eax
  xor    %edx,%edx
  xor    %r13d,%r13d
  xor    %r12d,%r12d
L72:
  mov    (%r10,%r13,4),%ebx
  mov    (%r9,%r12,4),%ebp
  mov    %r11d,%ecx
  cmp    %ebx,%ebp
  jge    L268
L99:
  add    $0x1,%eax
  mov    %ebp,-0x4(%r8,%r11,4)
  add    $0x1,%r11
  cmp    %eax,%esi
  jle    L206
  cmp    %edx,%edi
  jle    L164
  movslq %eax,%r12
  mov    (%r10,%r13,4),%ebx
  mov    %r11d,%ecx
  mov    (%r9,%r12,4),%ebp
  cmp    %ebx,%ebp
  jl     L99
L268:
  add    $0x1,%edx
  mov    %ebx,-0x4(%r8,%r11,4)
  add    $0x1,%r11
  cmp    %edx,%edi
  jle    L164
  cmp    %eax,%esi
  jle    L206
  movslq %edx,%r13
  jmp    L72
  cs nopw 0x0(%rax,%rax,1)
L202:
  xor    %ecx,%ecx
  xor    %eax,%eax
  xor    %edx,%edx
  cs nopw 0x0(%rax,%rax,1)
L206:
  cmp    %edx,%edi
  jle    L164
  movslq %ecx,%r13
  movslq %edx,%rbx
  mov    %edi,%r12d
  lea    0x1(%rbx),%r14
  shl    $0x2,%r13
  sub    %edx,%r12d
  mov    %r14,-0x10(%rsp)
  lea    (%r8,%r13,1),%rbp
  shl    $0x2,%r14
  lea    (%r10,%r14,1),%r15
  mov    %rbp,%r11
  sub    %r15,%r11
  cmp    $0x8,%r11
  jbe    L219
  lea    -0x1(%r12),%r15d
  cmp    $0x2,%r15d
  jbe    L219
  mov    %r12d,%ebx
  lea    -0x4(%r10,%r14,1),%r13
  xor    %r11d,%r11d
  shr    $0x2,%ebx
  shl    $0x4,%rbx
  xchg   %ax,%ax
L223:
  movdqu 0x0(%r13,%r11,1),%xmm0
  movups %xmm0,0x0(%rbp,%r11,1)
  add    $0x10,%r11
  cmp    %rbx,%r11
  jne    L223
  mov    %r12d,%ebx
  and    $0xfffffffc,%ebx
  add    %ebx,%edx
  lea    (%rcx,%rbx,1),%r11d
  cmp    %ebx,%r12d
  je     L150
  movslq %edx,%rbx
  mov    (%r10,%rbx,4),%ebp
  movslq %r11d,%rbx
  add    $0x1,%r11d
  mov    %ebp,(%r8,%rbx,4)
  lea    0x1(%rdx),%ebx
  cmp    %edi,%ebx
  jge    L150
  movslq %ebx,%rbx
  movslq %r11d,%r11
  add    $0x2,%edx
  lea    0x0(,%rbx,4),%rbp
  mov    (%r10,%rbx,4),%ebx
  lea    0x0(,%r11,4),%r13
  mov    %ebx,(%r8,%r11,4)
  cmp    %edi,%edx
  jge    L150
  mov    0x4(%r10,%rbp,1),%edx
  mov    %edx,0x4(%r8,%r13,1)
L150:
  add    %r12d,%ecx
L164:
  cmp    %eax,%esi
  jle    L33
  movslq %ecx,%r11
  movslq %eax,%rdi
  mov    %esi,%ebx
  shl    $0x2,%r11
  lea    0x1(%rdi),%rdx
  sub    %eax,%ebx
  lea    (%r8,%r11,1),%r10
  lea    0x0(,%rdx,4),%rbp
  lea    (%r9,%rbp,1),%r13
  mov    %r10,%r12
  sub    %r13,%r12
  cmp    $0x8,%r12
  jbe    L240
  lea    -0x1(%rbx),%r12d
  cmp    $0x2,%r12d
  jbe    L240
  mov    %ebx,%edi
  lea    -0x4(%r9,%rbp,1),%r11
  xor    %edx,%edx
  shr    $0x2,%edi
  shl    $0x4,%rdi
  nopw   0x0(%rax,%rax,1)
L226:
  movdqu (%r11,%rdx,1),%xmm1
  movups %xmm1,(%r10,%rdx,1)
  add    $0x10,%rdx
  cmp    %rdx,%rdi
  jne    L226
  mov    %ebx,%edx
  and    $0xfffffffc,%edx
  add    %edx,%eax
  add    %edx,%ecx
  cmp    %edx,%ebx
  je     L33
  movslq %eax,%rdx
  mov    (%r9,%rdx,4),%edi
  movslq %ecx,%rdx
  add    $0x1,%ecx
  mov    %edi,(%r8,%rdx,4)
  lea    0x1(%rax),%edx
  cmp    %edx,%esi
  jle    L33
  movslq %edx,%rdx
  movslq %ecx,%rcx
  add    $0x2,%eax
  lea    0x0(,%rdx,4),%r10
  mov    (%r9,%rdx,4),%edx
  lea    0x0(,%rcx,4),%rdi
  mov    %edx,(%r8,%rcx,4)
  cmp    %eax,%esi
  jle    L33
  mov    0x4(%r9,%r10,1),%eax
  mov    %eax,0x4(%r8,%rdi,1)
L33:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax,%rax,1)
L219:
  mov    %rbx,%rdx
  mov    -0x10(%rsp),%r11
  neg    %rdx
  lea    0x0(%r13,%rdx,4),%rbp
  add    %r8,%rbp
  jmp    L229
  nopl   (%rax)
L138:
  add    $0x1,%r11
L229:
  mov    (%r10,%rbx,4),%edx
  mov    %edx,0x0(%rbp,%rbx,4)
  mov    %r11,%rbx
  cmp    %r11d,%edi
  jg     L138
  add    %r12d,%ecx
  jmp    L164
  nopl   0x0(%rax)
L240:
  mov    %rdi,%rax
  neg    %rax
  lea    (%r11,%rax,4),%rax
  add    %rax,%r8
  jmp    L146
  nop
L28:
  add    $0x1,%rdx
L146:
  mov    (%r9,%rdi,4),%eax
  mov    %eax,(%r8,%rdi,4)
  mov    %rdx,%rdi
  cmp    %edx,%esi
  jg     L28
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void merge(int *L, int lcount, int *R, int rcount, int *Dest) {
  int iterl = 0, iterr = 0, iterd = 0;
  while (iterl < lcount && iterr < rcount) {
    if (L[iterl] > R[iterr]) {
      Dest[iterd] = R[iterr];
      iterr++;
      iterd++;
    } else {
      Dest[iterd] = L[iterl];
      iterl++;
      iterd++;
    }
  }
  while (iterl < lcount) {
    Dest[iterd] = L[iterl];
    iterl++;
    iterd++;
  }
  while (iterr < rcount) {
    Dest[iterd] = R[iterr];
    iterr++;
    iterd++;
  }
}
```