user: 请显示与下面列出的汇编代码相匹配的C语言实现:

```asm
<stable_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    %ecx,%eax
  mov    %r8d,%ebx
  mov    %r9d,0x8(%rsp)
  mov    %fs:0x28,%rdx
  mov    %rdx,0x18(%rsp)
  xor    %edx,%edx
  test   %ecx,%ecx
  je     L5
  mov    %rsi,%r14
  mov    %r8d,0x10(%rsp)
  mov    (%rdi),%rcx
  mov    (%rsi),%rdx
  mov    (%rdx),%esi
  cmp    %esi,(%rcx)
  setge  %dl
  movzbl %dl,%edx
  mov    %edx,0x14(%rsp)
  cmp    $0x1,%eax
  jle    L13
  lea    0x8(%rdi),%rbp
  sub    $0x2,%eax
  mov    %eax,0xc(%rsp)
  mov    %eax,%eax
  lea    0x10(%rdi,%rax,8),%r15
  mov    %r8d,%r12d
  lea    0x14(%rsp),%rax
  mov    %rax,(%rsp)
  jmp    L79
L5:
  mov    %r8d,%ecx
  neg    %ecx
  mov    %r9d,%esi
  imul   %r8d,%esi
  mov    0x60(%rsp),%edx
  mov    %r13,%rdi
  call   <stable_grail_merge_left_with_x_buf@plt>
  jmp    L128
L33:
  cltq
  movslq %ebx,%rsi
  mov    %rax,%rcx
  sub    %rsi,%rcx
  lea    0x0(%r13,%rcx,8),%rdi
  movslq %edx,%rdx
  shl    $0x3,%rdx
  lea    0x0(%r13,%rax,8),%rsi
  call   <memcpy@plt>
  mov    %ebx,0x10(%rsp)
L22:
  add    %ebx,%r12d
  add    $0x8,%rbp
  cmp    %r15,%rbp
  je     L96
L79:
  mov    0x10(%rsp),%edx
  mov    %r12d,%eax
  sub    %edx,%eax
  mov    0x0(%rbp),%rsi
  mov    (%r14),%rcx
  mov    (%rcx),%edi
  cmp    %edi,(%rsi)
  setge  %cl
  movzbl %cl,%ecx
  cmp    %ecx,0x14(%rsp)
  je     L33
  lea    0x10(%rsp),%rsi
  cltq
  lea    0x0(%r13,%rax,8),%rdi
  mov    %ebx,%r8d
  mov    %ebx,%ecx
  mov    (%rsp),%rdx
  mov    $0x0,%eax
  call   <stable_grail_smart_merge_with_x_buf@plt>
  jmp    L22
L96:
  mov    0xc(%rsp),%eax
  imul   %ebx,%eax
  lea    (%rax,%rbx,2),%ebp
L34:
  mov    0x10(%rsp),%edx
  mov    %ebp,%eax
  sub    %edx,%eax
  cmpl   $0x0,0x60(%rsp)
  je     L74
  cmpl   $0x0,0x14(%rsp)
  jne    L11
  mov    0x8(%rsp),%ecx
  imul   %ebx,%ecx
  add    %ecx,%edx
  mov    %edx,0x10(%rsp)
L62:
  neg    %ebx
  mov    %ebx,%ecx
  cltq
  lea    0x0(%r13,%rax,8),%rdi
  mov    0x60(%rsp),%edx
  mov    0x10(%rsp),%esi
  mov    $0x0,%eax
  call   <stable_grail_merge_left_with_x_buf@plt>
L128:
  mov    0x18(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L63
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L13:
  mov    %r8d,%ebp
  jmp    L34
L11:
  cltq
  movslq %ebx,%rsi
  mov    %rax,%rcx
  sub    %rsi,%rcx
  lea    0x0(%r13,%rcx,8),%rdi
  movslq %edx,%rdx
  shl    $0x3,%rdx
  lea    0x0(%r13,%rax,8),%rsi
  call   <memcpy@plt>
  mov    0x8(%rsp),%eax
  imul   %ebx,%eax
  mov    %eax,0x10(%rsp)
  movl   $0x0,0x14(%rsp)
  mov    %ebp,%eax
  jmp    L62
L74:
  cltq
  movslq %ebx,%rbx
  mov    %rax,%rcx
  sub    %rbx,%rcx
  lea    0x0(%r13,%rcx,8),%rdi
  movslq %edx,%rdx
  shl    $0x3,%rdx
  lea    0x0(%r13,%rax,8),%rsi
  call   <memcpy@plt>
  jmp    L128
L63:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
void stable_grail_merge_buffers_left_with_x_buf(int **keys, int **midkey, int **arr, int nblock, int lblock, int nblock2, int llast) {
  int l, prest, lrest, frest, pidx, cidx, fnext;
  if (nblock == 0) {
    l = nblock2 * lblock;
    stable_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(int *));
      prest = pidx;
      lrest = lblock;
    } else {
      stable_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(int *));
      prest = pidx;
      lrest = lblock * nblock2;
      frest = 0;
    } else {
      lrest += lblock * nblock2;
    }
    stable_grail_merge_left_with_x_buf(arr + prest, lrest, llast, -lblock);
  } else {
    memcpy((arr + prest - lblock), (arr + prest), (lrest) * sizeof(int *));
  }
}
```