user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<merge_int>:
  endbr64
  push   %r15
  mov    %edx,%r8d
  mov    %ecx,%r15d
  push   %r14
  sub    %esi,%r8d
  mov    %esi,%r14d
  push   %r13
  lea    0x1(%r8),%ecx
  mov    %rdi,%r13
  lea    0x8(,%r8,4),%edi
  push   %r12
  push   %rbp
  push   %rbx
  mov    %r15d,%ebx
  sub    %edx,%ebx
  sub    $0x18,%rsp
  mov    %ecx,0x8(%rsp)
  mov    %edx,0x4(%rsp)
  mov    %r8d,0xc(%rsp)
  call   <malloc@plt>
  lea    0x4(,%rbx,4),%edi
  mov    %rax,%r12
  call   <malloc@plt>
  mov    0x4(%rsp),%esi
  movslq 0x8(%rsp),%rcx
  mov    %rax,%rbp
  cmp    %r14d,%esi
  jl     L236
  movslq %r14d,%rdx
  mov    %r12,%r9
  lea    0x1(%rdx),%rax
  lea    0x0(,%rax,4),%rdi
  lea    0x0(%r13,%rdi,1),%r10
  sub    %r10,%r9
  cmp    $0x8,%r9
  jbe    L209
  mov    0xc(%rsp),%r8d
  cmp    $0x2,%r8d
  jbe    L209
  mov    %ecx,%edx
  lea    -0x4(%r13,%rdi,1),%rdi
  xor    %eax,%eax
  shr    $0x2,%edx
  shl    $0x4,%rdx
  nopl   0x0(%rax,%rax,1)
L201:
  movdqu (%rdi,%rax,1),%xmm0
  movups %xmm0,(%r12,%rax,1)
  add    $0x10,%rax
  cmp    %rdx,%rax
  jne    L201
  mov    %ecx,%edx
  and    $0xfffffffc,%edx
  lea    (%r14,%rdx,1),%eax
  cmp    %edx,%ecx
  je     L236
  movslq %eax,%rdi
  movslq %edx,%rdx
  mov    0x0(%r13,%rdi,4),%edi
  mov    %edi,(%r12,%rdx,4)
  lea    0x1(%rax),%edx
  cmp    %esi,%edx
  jg     L236
  movslq %edx,%rdi
  sub    %r14d,%edx
  add    $0x2,%eax
  lea    0x0(,%rdi,4),%r8
  mov    0x0(%r13,%rdi,4),%edi
  movslq %edx,%rdx
  mov    %edi,(%r12,%rdx,4)
  cmp    %eax,%esi
  jl     L236
  mov    0x4(%r13,%r8,1),%edx
  sub    %r14d,%eax
  cltq
  mov    %edx,(%r12,%rax,4)
L236:
  mov    D3(%rip),%rdi
  mov    (%rdi),%eax
  mov    %eax,(%r12,%rcx,4)
  lea    0x1(%rsi),%ecx
  cmp    %ecx,%r15d
  jl     L174
  movslq %esi,%rdx
  mov    %rbp,%r9
  mov    %r15d,%r8d
  lea    0x8(,%rdx,4),%rax
  sub    %esi,%r8d
  lea    0x0(%r13,%rax,1),%r10
  sub    %r10,%r9
  cmp    $0x8,%r9
  jbe    L43
  lea    -0x1(%r8),%r9d
  cmp    $0x2,%r9d
  jbe    L43
  mov    %r8d,%edx
  lea    -0x4(%r13,%rax,1),%r9
  xor    %eax,%eax
  shr    $0x2,%edx
  shl    $0x4,%rdx
  nopl   0x0(%rax,%rax,1)
L68:
  movdqu (%r9,%rax,1),%xmm1
  movups %xmm1,0x0(%rbp,%rax,1)
  add    $0x10,%rax
  cmp    %rdx,%rax
  jne    L68
  mov    %r8d,%edx
  and    $0xfffffffc,%edx
  lea    (%rdx,%rcx,1),%eax
  cmp    %edx,%r8d
  je     L174
  movslq %eax,%rdx
  mov    0x0(%r13,%rdx,4),%ecx
  mov    %eax,%edx
  sub    %esi,%edx
  movslq %edx,%rdx
  mov    %ecx,-0x4(%rbp,%rdx,4)
  lea    0x1(%rax),%edx
  cmp    %edx,%r15d
  jl     L174
  movslq %edx,%rcx
  sub    %esi,%edx
  add    $0x2,%eax
  lea    0x0(,%rcx,4),%r8
  mov    0x0(%r13,%rcx,4),%ecx
  movslq %edx,%rdx
  mov    %ecx,-0x4(%rbp,%rdx,4)
  cmp    %eax,%r15d
  jl     L174
  mov    0x4(%r13,%r8,1),%edx
  sub    %esi,%eax
  cltq
  mov    %edx,-0x4(%rbp,%rax,4)
L174:
  mov    (%rdi),%eax
  movslq %ebx,%rbx
  mov    %eax,0x0(%rbp,%rbx,4)
  cmp    %r15d,%r14d
  jg     L31
  mov    %r15d,%edx
  movslq %r14d,%rcx
  xor    %r9d,%r9d
  xor    %r8d,%r8d
  sub    %r14d,%edx
  lea    0x0(%r13,%rcx,4),%rax
  xor    %edi,%edi
  xor    %esi,%esi
  add    %rcx,%rdx
  lea    0x4(%r13,%rdx,4),%r10
  nopl   0x0(%rax)
L83:
  mov    (%r12,%rdi,4),%ecx
  mov    0x0(%rbp,%rsi,4),%edx
  cmp    %ecx,%edx
  jle    L93
L233:
  mov    %ecx,(%rax)
  add    $0x4,%rax
  add    $0x1,%r8d
  cmp    %rax,%r10
  je     L31
  movslq %r8d,%rdi
  mov    0x0(%rbp,%rsi,4),%edx
  mov    (%r12,%rdi,4),%ecx
  cmp    %ecx,%edx
  jg     L233
L93:
  mov    %edx,(%rax)
  add    $0x4,%rax
  add    $0x1,%r9d
  cmp    %r10,%rax
  je     L31
  movslq %r9d,%rsi
  jmp    L83
  cs nopw 0x0(%rax,%rax,1)
L31:
  mov    %r12,%rdi
  call   <free@plt>
  add    $0x18,%rsp
  mov    %rbp,%rdi
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    1060 <free@plt>
  xchg   %ax,%ax
L43:
  neg    %rdx
  movslq %ecx,%rax
  lea    0x0(%rbp,%rdx,4),%rcx
  nopl   0x0(%rax,%rax,1)
L237:
  mov    0x0(%r13,%rax,4),%edx
  mov    %edx,-0x4(%rcx,%rax,4)
  add    $0x1,%rax
  cmp    %eax,%r15d
  jge    L237
  jmp    L174
  nopw   0x0(%rax,%rax,1)
L209:
  mov    %rdx,%rdi
  neg    %rdi
  lea    (%r12,%rdi,4),%r8
  jmp    L36
  nopl   0x0(%rax)
L212:
  add    $0x1,%rax
L36:
  mov    0x0(%r13,%rdx,4),%edi
  mov    %edi,(%r8,%rdx,4)
  mov    %rax,%rdx
  cmp    %eax,%esi
  jge    L212
  jmp    L236
```

assistant: ```c
void merge_int(int A[], int start, int mid, int end) {
  int nl = mid - start + 1;
  int nr = end - mid;
  int *left = malloc(sizeof(int) * (nl + 1));
  int *right = malloc(sizeof(int) * (nr + 1));
  for (int i = start; i <= mid; ++i) {
    left[i - start] = A[i];
  }
  left[nl] = INT_MAX;
  for (int j = mid + 1; j <= end; ++j) {
    right[j - mid - 1] = A[j];
  }
  right[nr] = INT_MAX;
  int i = 0, j = 0;
  for (int k = start; k <= end; ++k) {
    A[k] = left[i] < right[j] ? left[i++] : right[j++];
  }
  free(left);
  free(right);
}
```