user: 请从给定的汇编指令推导出C源代码:

```asm
<merge>:
  endbr64
  push   %r15
  mov    %edx,%r9d
  mov    %esi,%r15d
  push   %r14
  mov    %ecx,%r14d
  sub    %esi,%r9d
  push   %r13
  mov    %r14d,%r13d
  lea    0x1(%r9),%ecx
  push   %r12
  sub    %edx,%r13d
  push   %rbp
  push   %rbx
  mov    %rdi,%rbx
  lea    0x8(,%r9,4),%edi
  sub    $0x18,%rsp
  mov    %ecx,0xc(%rsp)
  mov    %r9d,0x4(%rsp)
  mov    %edx,0x8(%rsp)
  call   <malloc@plt>
  lea    0x1(%r13),%r8d
  lea    0x0(,%r8,4),%edi
  mov    %r8d,(%rsp)
  mov    %rax,%rbp
  call   <malloc@plt>
  movslq 0xc(%rsp),%rcx
  mov    (%rsp),%r8d
  mov    0x4(%rsp),%r9d
  mov    0x8(%rsp),%esi
  mov    %rax,%r12
  test   %ecx,%ecx
  jle    L139
  movslq %r15d,%rax
  mov    %rbp,%rdx
  lea    0x4(,%rax,4),%rax
  lea    (%rbx,%rax,1),%rdi
  sub    %rdi,%rdx
  cmp    $0x8,%rdx
  jbe    L151
  cmp    $0x2,%r9d
  jbe    L151
  mov    %ecx,%edx
  lea    -0x4(%rbx,%rax,1),%rdi
  xor    %eax,%eax
  shr    $0x2,%edx
  shl    $0x4,%rdx
  nopl   0x0(%rax,%rax,1)
L125:
  movdqu (%rdi,%rax,1),%xmm0
  movups %xmm0,0x0(%rbp,%rax,1)
  add    $0x10,%rax
  cmp    %rdx,%rax
  jne    L125
  mov    %ecx,%eax
  and    $0xfffffffc,%eax
  test   $0x3,%cl
  je     L139
  lea    (%r15,%rax,1),%edi
  movslq %eax,%r10
  movslq %edi,%rdi
  lea    0x0(,%r10,4),%rdx
  mov    (%rbx,%rdi,4),%edi
  mov    %edi,0x0(%rbp,%r10,4)
  lea    0x1(%rax),%r10d
  cmp    %eax,%r9d
  jle    L139
  lea    (%r10,%r15,1),%edi
  add    $0x2,%eax
  movslq %edi,%rdi
  mov    (%rbx,%rdi,4),%edi
  mov    %edi,0x4(%rbp,%rdx,1)
  cmp    %r10d,%r9d
  jle    L139
  add    %r15d,%eax
  cltq
  mov    (%rbx,%rax,4),%eax
  mov    %eax,0x8(%rbp,%rdx,1)
L139:
  test   %r13d,%r13d
  jle    L203
  movslq %esi,%rax
  mov    %r12,%rdx
  lea    0x8(,%rax,4),%rax
  lea    (%rbx,%rax,1),%rdi
  sub    %rdi,%rdx
  cmp    $0x8,%rdx
  jbe    L129
  lea    -0x1(%r13),%edx
  cmp    $0x2,%edx
  jbe    L129
  mov    %r13d,%edx
  lea    -0x4(%rbx,%rax,1),%rdi
  xor    %eax,%eax
  shr    $0x2,%edx
  shl    $0x4,%rdx
L135:
  movdqu (%rdi,%rax,1),%xmm1
  movups %xmm1,(%r12,%rax,1)
  add    $0x10,%rax
  cmp    %rdx,%rax
  jne    L135
  mov    %r13d,%eax
  and    $0xfffffffc,%eax
  test   $0x3,%r13b
  je     L203
  lea    (%rsi,%rax,1),%edx
  mov    %eax,%r8d
  movslq %edx,%rdx
  lea    0x0(,%r8,4),%rdi
  mov    0x4(%rbx,%rdx,4),%edx
  mov    %edx,(%r12,%r8,4)
  lea    0x1(%rax),%edx
  cmp    %edx,%r13d
  jle    L203
  add    %esi,%edx
  add    $0x2,%eax
  movslq %edx,%rdx
  mov    0x4(%rbx,%rdx,4),%edx
  mov    %edx,0x4(%r12,%rdi,1)
  cmp    %r13d,%eax
  jge    L203
  add    %esi,%eax
  cltq
  mov    0x4(%rbx,%rax,4),%eax
  mov    %eax,0x8(%r12,%rdi,1)
L203:
  mov    D7(%rip),%rax
  movslq %r13d,%r13
  mov    (%rax),%eax
  mov    %eax,0x0(%rbp,%rcx,4)
  mov    %eax,(%r12,%r13,4)
  cmp    %r14d,%r15d
  jg     L239
  movslq %r15d,%rdx
  sub    %r15d,%r14d
  xor    %r9d,%r9d
  xor    %r8d,%r8d
  add    %rdx,%r14
  lea    (%rbx,%rdx,4),%rax
  xor    %edi,%edi
  xor    %esi,%esi
  lea    0x4(%rbx,%r14,4),%r10
  nopl   0x0(%rax,%rax,1)
L2:
  mov    0x0(%rbp,%rdi,4),%ecx
  mov    (%r12,%rsi,4),%edx
  cmp    %ecx,%edx
  jl     L30
L137:
  mov    %ecx,(%rax)
  add    $0x4,%rax
  add    $0x1,%r8d
  cmp    %r10,%rax
  je     L239
  movslq %r8d,%rdi
  mov    (%r12,%rsi,4),%edx
  mov    0x0(%rbp,%rdi,4),%ecx
  cmp    %ecx,%edx
  jge    L137
L30:
  mov    %edx,(%rax)
  add    $0x4,%rax
  add    $0x1,%r9d
  cmp    %r10,%rax
  je     L239
  movslq %r9d,%rsi
  jmp    L2
  xchg   %ax,%ax
L239:
  mov    %rbp,%rdi
  call   <free@plt>
  add    $0x18,%rsp
  mov    %r12,%rdi
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    1060 <free@plt>
  xchg   %ax,%ax
L129:
  lea    -0x8(%rbx,%rax,1),%rsi
  mov    %r8d,%r8d
  mov    $0x1,%eax
  nopl   (%rax)
L234:
  mov    (%rsi,%rax,4),%edx
  mov    %edx,-0x4(%r12,%rax,4)
  add    $0x1,%rax
  cmp    %r8,%rax
  jne    L234
  jmp    L203
  cs nopw 0x0(%rax,%rax,1)
L151:
  lea    -0x4(%rbx,%rax,1),%rdi
  lea    0x4(,%r9,4),%r9
  xor    %eax,%eax
  nop
L213:
  mov    (%rdi,%rax,1),%edx
  mov    %edx,0x0(%rbp,%rax,1)
  add    $0x4,%rax
  cmp    %r9,%rax
  jne    L213
  jmp    L139
```

assistant: ```c
void merge(int *input_array, int start, int mid, int end) {
  int first_size, second_size, i, j, k, *first_half, *second_half;
  first_size = mid - start + 1;
  second_size = end - mid;
  first_half = malloc((first_size + 1) * sizeof(int));
  second_half = malloc((second_size + 1) * sizeof(int));
  for (i = 0; i < first_size; ++i) {
    first_half[i] = input_array[start + i];
  }
  for (j = 0; j < second_size; ++j) {
    second_half[j] = input_array[mid + j + 1];
  }
  first_half[first_size] = INT_MAX;
  second_half[second_size] = INT_MAX;
  i = 0;
  j = 0;
  for (k = start; k <= end; ++k) {
    if (first_half[i] <= second_half[j]) {
      input_array[k] = first_half[i];
      i += 1;
    } else {
      input_array[k] = second_half[j];
      j += 1;
    }
  }
  free(first_half);
  free(second_half);
}
```