user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<sorter_grail_merge_buffers_left_with_x_buf>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x28,%rsp
  mov    %rdx,%r13
  mov    %r8d,%ebx
  mov    %r9d,0x8(%rsp)
  mov    %fs:0x28,%rdx
  mov    %rdx,0x18(%rsp)
  xor    %edx,%edx
  test   %ecx,%ecx
  je     L10
  mov    %rdi,%rax
  mov    %rsi,%r14
  mov    %r8d,0x10(%rsp)
  mov    (%rsi),%rdi
  cmp    %rdi,(%rax)
  setge  %dl
  movzbl %dl,%edx
  mov    %edx,0x14(%rsp)
  cmp    $0x1,%ecx
  jle    L112
  lea    0x8(%rax),%rbp
  lea    -0x2(%rcx),%edi
  mov    %edi,0xc(%rsp)
  mov    %edi,%edx
  lea    0x10(%rax,%rdx,8),%r15
  mov    %r8d,%r12d
  lea    0x14(%rsp),%rax
  mov    %rax,(%rsp)
  jmp    L106
L10:
  mov    %r8d,%ecx
  neg    %ecx
  mov    %r9d,%esi
  imul   %r8d,%esi
  mov    0x60(%rsp),%edx
  mov    %r13,%rdi
  call   <sorter_grail_merge_left_with_x_buf@plt>
  jmp    L4
L13:
  cltq
  shl    $0x3,%edx
  lea    0x0(%r13,%rax,8),%rsi
  movslq %ebx,%rcx
  sub    %rcx,%rax
  lea    0x0(%r13,%rax,8),%rdi
  call   <memcpy@plt>
  mov    %ebx,0x10(%rsp)
L67:
  add    %ebx,%r12d
  add    $0x8,%rbp
  cmp    %r15,%rbp
  je     L12
L106:
  mov    0x10(%rsp),%edx
  mov    %r12d,%eax
  sub    %edx,%eax
  mov    (%r14),%rsi
  cmp    %rsi,0x0(%rbp)
  setge  %cl
  movzbl %cl,%ecx
  cmp    %ecx,0x14(%rsp)
  je     L13
  lea    0x10(%rsp),%rsi
  cltq
  lea    0x0(%r13,%rax,8),%rdi
  mov    %ebx,%r8d
  mov    %ebx,%ecx
  mov    (%rsp),%rdx
  call   <sorter_grail_smart_merge_with_x_buf@plt>
  jmp    L67
L12:
  mov    0xc(%rsp),%eax
  imul   %ebx,%eax
  lea    (%rax,%rbx,2),%ebp
L79:
  mov    0x10(%rsp),%edx
  mov    %ebp,%eax
  sub    %edx,%eax
  cmpl   $0x0,0x60(%rsp)
  je     L82
  cmpl   $0x0,0x14(%rsp)
  jne    L9
  mov    0x8(%rsp),%ecx
  imul   %ebx,%ecx
  add    %ecx,%edx
  mov    %edx,0x10(%rsp)
L46:
  neg    %ebx
  mov    %ebx,%ecx
  cltq
  lea    0x0(%r13,%rax,8),%rdi
  mov    0x60(%rsp),%edx
  mov    0x10(%rsp),%esi
  call   <sorter_grail_merge_left_with_x_buf@plt>
L4:
  mov    0x18(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L3
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L112:
  mov    %r8d,%ebp
  jmp    L79
L9:
  cltq
  shl    $0x3,%edx
  lea    0x0(%r13,%rax,8),%rsi
  movslq %ebx,%rcx
  sub    %rcx,%rax
  lea    0x0(%r13,%rax,8),%rdi
  call   <memcpy@plt>
  mov    0x8(%rsp),%eax
  imul   %ebx,%eax
  mov    %eax,0x10(%rsp)
  movl   $0x0,0x14(%rsp)
  mov    %ebp,%eax
  jmp    L46
L82:
  cltq
  shl    $0x3,%edx
  lea    0x0(%r13,%rax,8),%rsi
  movslq %ebx,%rbx
  sub    %rbx,%rax
  lea    0x0(%r13,%rax,8),%rdi
  call   <memcpy@plt>
  jmp    L4
L3:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
void sorter_grail_merge_buffers_left_with_x_buf(int64_t *keys, int64_t *midkey, int64_t *arr, int nblock, int lblock, int nblock2, int llast) {
  int l, prest, lrest, frest, pidx, cidx, fnext;
  if (nblock == 0) {
    l = nblock2 * lblock;
    sorter_grail_merge_left_with_x_buf(arr, l, llast, -lblock);
    return;
  }
  lrest = lblock;
  frest = ((*(keys)) - (*(midkey))) < 0 ? 0 : 1;
  pidx = lblock;
  for (cidx = 1; cidx < nblock; cidx++, pidx += lblock) {
    prest = pidx - lrest;
    fnext = ((*(keys + cidx)) - (*(midkey))) < 0 ? 0 : 1;
    if (fnext == frest) {
      memcpy(arr + prest - lblock, arr + prest, lrest * sizeof(int64_t));
      prest = pidx;
      lrest = lblock;
    } else {
      sorter_grail_smart_merge_with_x_buf(arr + prest, &lrest, &frest, lblock, lblock);
    }
  }
  prest = pidx - lrest;
  if (llast) {
    if (frest) {
      memcpy(arr + prest - lblock, arr + prest, lrest * sizeof(int64_t));
      prest = pidx;
      lrest = lblock * nblock2;
      frest = 0;
    } else {
      lrest += lblock * nblock2;
    }
    sorter_grail_merge_left_with_x_buf(arr + prest, lrest, llast, -lblock);
  } else {
    memcpy(arr + prest - lblock, arr + prest, lrest * sizeof(int64_t));
  }
}
```