user: Translate the below assembly code into C programming language:

```asm
<stable_grail_combine_blocks>:
  endbr64
  push   %r15
  mov    %rdi,%r11
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  movslq %r8d,%rbp
  push   %rbx
  mov    %edx,%ebx
  mov    %ebx,%eax
  sub    $0x78,%rsp
  mov    0xb0(%rsp),%rdx
  mov    %rsi,0x50(%rsp)
  lea    (%rcx,%rcx,1),%esi
  mov    %ecx,0x40(%rsp)
  mov    %rdx,0x30(%rsp)
  cltd
  idiv   %esi
  mov    %r9d,0x58(%rsp)
  mov    %esi,0x44(%rsp)
  mov    %ebx,0x5c(%rsp)
  mov    %edx,0x48(%rsp)
  mov    %eax,0x2c(%rsp)
  cmp    %edx,%ecx
  jl     L278
  sub    %edx,%ebx
  movl   $0x0,0x48(%rsp)
  mov    %ebx,0x5c(%rsp)
L278:
  mov    0x30(%rsp),%rdi
  test   %rdi,%rdi
  je     L111
  movslq %ebp,%rax
  mov    0x50(%rsp),%r12
  mov    %r11,0x8(%rsp)
  lea    0x0(,%rax,8),%r13
  mov    %rax,0x60(%rsp)
  sub    %r13,%r12
  mov    %r13,%rdx
  mov    %r12,%rsi
  call   <memcpy@plt>
  mov    0x2c(%rsp),%r8d
  mov    0x8(%rsp),%r11
  test   %r8d,%r8d
  js     L147
  mov    0x48(%rsp),%ecx
  sete   %al
  test   %ecx,%ecx
  sete   0x4f(%rsp)
  or     0x2c(%rsp),%ecx
  je     L325
L326:
  movslq 0x44(%rsp),%rdx
  movl   $0x0,0x28(%rsp)
  mov    0x50(%rsp),%r13
  lea    0x0(,%rdx,8),%rcx
  mov    %ebp,%edx
  mov    %rcx,0x38(%rsp)
  neg    %edx
  mov    0x60(%rsp),%rcx
  movslq %edx,%rdx
  lea    0x0(,%rcx,8),%r14
  lea    0x0(,%rdx,8),%rcx
  mov    %rcx,0x68(%rsp)
L18:
  mov    0x28(%rsp),%edx
  movzbl %al,%ecx
  cmp    %edx,0x2c(%rsp)
  je     L21
  mov    0x44(%rsp),%eax
  mov    %r11,%rdi
  mov    %r11,0x8(%rsp)
  cltd
  idiv   %ebp
  mov    %eax,%r12d
  lea    (%rax,%rcx,1),%esi
  xor    %eax,%eax
  call   <stable_binary_insertion_sort@plt>
  mov    0x40(%rsp),%eax
  mov    0x8(%rsp),%r11
  cltd
  idiv   %ebp
  cmp    $0x1,%r12d
  mov    %eax,0x14(%rsp)
  jle    L181
L233:
  mov    %ebp,%edx
  lea    0x0(%r13,%r14,1),%rcx
  xor    %r10d,%r10d
  xor    %r15d,%r15d
  mov    %r11,%rbp
  nopw   0x0(%rax,%rax,1)
L355:
  mov    %r15d,%r9d
  mov    %r15,%r8
  add    $0x1,%r15
  mov    %rcx,%rsi
  mov    %r15,%rax
  mov    %r9d,%ebx
  jmp    L136
  nopl   (%rax)
L98:
  mov    %eax,%ebx
L170:
  add    $0x1,%rax
  add    %r14,%rsi
  cmp    %eax,%r12d
  jle    L349
L136:
  mov    %edx,%edi
  mov    (%rsi),%r11
  imul   %ebx,%edi
  movslq %edi,%rdi
  mov    0x0(%r13,%rdi,8),%rdi
  mov    (%rdi),%edi
  sub    (%r11),%edi
  test   %edi,%edi
  jg     L98
  jne    L170
  movslq %ebx,%rdi
  mov    0x0(%rbp,%rdi,8),%r11
  mov    0x0(%rbp,%rax,8),%rdi
  mov    (%rdi),%edi
  cmp    %edi,(%r11)
  cmovg  %eax,%ebx
  add    $0x1,%rax
  add    %r14,%rsi
  cmp    %eax,%r12d
  jg     L136
L349:
  cmp    %r8d,%ebx
  mov    %r9d,0x10(%rsp)
  mov    %r8,0x8(%rsp)
  je     L51
  mov    %ebx,%eax
  mov    %rcx,0x20(%rsp)
  imul   %edx,%eax
  mov    %r10d,0x1c(%rsp)
  mov    %edx,0x18(%rsp)
  cltq
  lea    0x0(%r13,%rax,8),%rsi
  movslq %r10d,%rax
  lea    0x0(%r13,%rax,8),%rdi
  xor    %eax,%eax
  call   <stable_grail_swap_n@plt>
  mov    0x8(%rsp),%r8
  movslq %ebx,%rax
  lea    0x0(%rbp,%rax,8),%rsi
  xor    %eax,%eax
  lea    0x0(%rbp,%r8,8),%rdi
  call   <stable_grail_swap1@plt>
  mov    0x14(%rsp),%eax
  mov    0x18(%rsp),%edx
  mov    0x1c(%rsp),%r10d
  mov    0x20(%rsp),%rcx
  cmp    %eax,%ebx
  mov    0x10(%rsp),%r9d
  je     L138
  mov    0x8(%rsp),%r8
  cmp    %r8d,%eax
  je     L138
L51:
  lea    0x1(%r15),%eax
  add    %edx,%r10d
  add    %r14,%rcx
  cmp    %eax,%r12d
  jg     L355
  mov    %rbp,%r11
  mov    0x28(%rsp),%ecx
  movslq %edx,%rbp
  cmp    %ecx,0x2c(%rsp)
  je     L43
L181:
  xor    %edx,%edx
  xor    %r9d,%r9d
L321:
  movslq 0x14(%rsp),%rax
  cmpq   $0x0,0x30(%rsp)
  lea    (%r11,%rax,8),%rsi
  je     L118
  sub    $0x8,%rsp
  mov    %r11,%rdi
  mov    %ebp,%r8d
  mov    %r12d,%ecx
  push   %rdx
  xor    %eax,%eax
  mov    %r13,%rdx
  mov    %r11,0x18(%rsp)
  call   <stable_grail_merge_buffers_left_with_x_buf@plt>
  pop    %rsi
  pop    %rdi
  mov    0x8(%rsp),%r11
L399:
  addl   $0x1,0x28(%rsp)
  mov    0x28(%rsp),%eax
  cmp    %eax,0x2c(%rsp)
  jl     L246
  sete   %al
  add    0x38(%rsp),%r13
  test   %al,%al
  je     L18
  cmpb   $0x0,0x4f(%rsp)
  je     L18
L246:
  cmpq   $0x0,0x30(%rsp)
  je     L62
L325:
  mov    0x60(%rsp),%r13
  mov    0x50(%rsp),%r12
  shl    $0x3,%r13
  sub    %r13,%r12
L147:
  mov    0x5c(%rsp),%edx
  mov    0x50(%rsp),%rcx
  sub    $0x1,%edx
  movslq %edx,%rax
  js     L134
L248:
  mov    (%r12,%rax,8),%rdx
  mov    %rdx,(%rcx,%rax,8)
  sub    $0x1,%rax
  test   %eax,%eax
  jns    L248
L134:
  mov    0x30(%rsp),%rsi
  add    $0x78,%rsp
  mov    %r13,%rdx
  mov    %r12,%rdi
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    10d0 <memcpy@plt>
  nopl   0x0(%rax,%rax,1)
L138:
  xor    0x14(%rsp),%r9d
  xor    %r9d,%ebx
  mov    %ebx,0x14(%rsp)
  jmp    L51
L118:
  push   %rdx
  mov    %r12d,%ecx
  mov    %r13,%rdx
  mov    %r11,%rdi
  push   %r9
  mov    0x68(%rsp),%r9d
  mov    %ebp,%r8d
  xor    %eax,%eax
  mov    %r11,0x18(%rsp)
  call   <stable_grail_merge_buffers_left@plt>
  pop    %rdx
  pop    %rcx
  mov    0x8(%rsp),%r11
  jmp    L399
L21:
  mov    0x48(%rsp),%eax
  mov    %r11,%rdi
  mov    %r11,0x8(%rsp)
  cltd
  idiv   %ebp
  mov    %eax,%r12d
  lea    (%rax,%rcx,1),%esi
  xor    %eax,%eax
  mov    %edx,%ebx
  call   <stable_binary_insertion_sort@plt>
  mov    0x40(%rsp),%eax
  mov    0x8(%rsp),%r11
  cltd
  idiv   %ebp
  cmp    $0x1,%r12d
  mov    %eax,0x14(%rsp)
  jg     L233
  mov    %ebx,%edx
  test   %ebx,%ebx
  je     L181
  xor    %r9d,%r9d
  test   %r12d,%r12d
  jle    L321
L319:
  mov    %ebp,%eax
  mov    0x68(%rsp),%r8
  xor    %r9d,%r9d
  imul   %r12d,%eax
  movslq %eax,%rcx
  sub    %ebp,%eax
  mov    0x0(%r13,%rcx,8),%rcx
  cltq
  lea    0x0(%r13,%rax,8),%rax
  mov    (%rcx),%edi
  jmp    L398
L352:
  add    $0x1,%r9d
  add    %r8,%rax
  cmp    %r12d,%r9d
  je     L208
L398:
  mov    (%rax),%rcx
  mov    %r12d,%esi
  sub    %r9d,%esi
  cmp    (%rcx),%edi
  jl     L352
  mov    %esi,%r12d
  jmp    L321
L43:
  mov    0x48(%rsp),%eax
  cltd
  idiv   %ebp
  test   %edx,%edx
  je     L181
  jmp    L319
L111:
  mov    0x2c(%rsp),%ecx
  test   %ecx,%ecx
  js     L62
  mov    0x48(%rsp),%edx
  sete   %al
  test   %edx,%edx
  sete   0x4f(%rsp)
  or     %ecx,%edx
  je     L62
  movslq %ebp,%rcx
  mov    %rcx,0x60(%rsp)
  jmp    L326
L62:
  mov    0x58(%rsp),%eax
  test   %eax,%eax
  je     L232
  mov    0x5c(%rsp),%eax
  sub    $0x1,%eax
  js     L232
  mov    0x50(%rsp),%rcx
  movslq %eax,%rdx
  mov    %eax,%eax
  neg    %rbp
  shl    $0x3,%rdx
  shl    $0x3,%rax
  lea    -0x8(%rcx,%rdx,1),%r12
  lea    (%rcx,%rdx,1),%rbx
  shl    $0x3,%rbp
  sub    %rax,%r12
L137:
  lea    0x0(%rbp,%rbx,1),%rsi
  mov    %rbx,%rdi
  xor    %eax,%eax
  sub    $0x8,%rbx
  call   <stable_grail_swap1@plt>
  cmp    %rbx,%r12
  jne    L137
L232:
  add    $0x78,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L208:
  xor    %r12d,%r12d
  jmp    L321
```

assistant: ```c
void stable_grail_combine_blocks(int **keys, int **arr, int len, int LL, int lblock, int havebuf, int **xbuf) {
  int M, b, NBlk, midkey, lrest, u, p, v, kc, nbl2, llast;
  int **arr1;
  M = len / (2 * LL);
  lrest = len % (2 * LL);
  if (lrest <= LL) {
    len -= lrest;
    lrest = 0;
  }
  if (xbuf) {
    memcpy((xbuf), (arr - lblock), (lblock) * sizeof(int *));
  }
  for (b = 0; b <= M; b++) {
    if (b == M && lrest == 0) {
      break;
    }
    arr1 = arr + b * 2 * LL;
    NBlk = (b == M ? lrest : 2 * LL) / lblock;
    stable_binary_insertion_sort(keys, NBlk + (b == M ? 1 : 0));
    midkey = LL / lblock;
    for (u = 1; u < NBlk; u++) {
      p = u - 1;
      for (v = u; v < NBlk; v++) {
        kc = (*(*(arr1 + p * lblock)) - *(*(arr1 + v * lblock)));
        if (kc > 0 || (kc == 0 && (*(*(keys + p)) - *(*(keys + v))) > 0)) {
          p = v;
        }
      }
      if (p != u - 1) {
        stable_grail_swap_n(arr1 + (u - 1) * lblock, arr1 + p * lblock, lblock);
        stable_grail_swap1(keys + (u - 1), keys + p);
        if (midkey == u - 1 || midkey == p) {
          midkey ^= (u - 1) ^ p;
        }
      }
    }
    nbl2 = llast = 0;
    if (b == M) {
      llast = lrest % lblock;
    }
    if (llast != 0) {
      while (nbl2 < NBlk && (*(*(arr1 + NBlk * lblock)) - *(*(arr1 + (NBlk - nbl2 - 1) * lblock))) < 0) {
        nbl2++;
      }
    }
    if (xbuf) {
      stable_grail_merge_buffers_left_with_x_buf(keys, keys + midkey, arr1, NBlk - nbl2, lblock, nbl2, llast);
    } else {
      stable_grail_merge_buffers_left(keys, keys + midkey, arr1, NBlk - nbl2, lblock, havebuf, nbl2, llast);
    }
  }
  if (xbuf) {
    for (p = len; --p >= 0;) {
      arr[p] = arr[p - lblock];
    }
    memcpy((arr - lblock), (xbuf), (lblock) * sizeof(int *));
  } else if (havebuf) {
    while (--len >= 0) {
      stable_grail_swap1(arr + len, arr + len - lblock);
    }
  }
}
```