user: 请从给定的汇编指令推导出C源代码:

```asm
<stable_grail_combine_blocks>:
  endbr64
  push   %r15
  mov    %edx,%eax
  push   %r14
  mov    %r8d,%r14d
  push   %r13
  mov    %rdi,%r13
  mov    %edx,%edi
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x78,%rsp
  mov    0xb0(%rsp),%rbx
  mov    %edx,0x58(%rsp)
  cltd
  mov    %rsi,0x48(%rsp)
  mov    %rbx,0x30(%rsp)
  lea    (%rcx,%rcx,1),%ebx
  idiv   %ebx
  mov    %ecx,0x40(%rsp)
  mov    %r9d,0x5c(%rsp)
  mov    %ebx,0x44(%rsp)
  mov    %edx,0x50(%rsp)
  mov    %eax,0x2c(%rsp)
  cmp    %edx,%ecx
  jl     L455
  sub    %edx,%edi
  movl   $0x0,0x50(%rsp)
  mov    %edi,0x58(%rsp)
L455:
  mov    0x30(%rsp),%rdi
  test   %rdi,%rdi
  je     L252
  movslq %r14d,%rax
  mov    0x48(%rsp),%rbp
  lea    0x0(,%rax,8),%r12
  mov    %rax,0x60(%rsp)
  sub    %r12,%rbp
  mov    %r12,%rdx
  mov    %rbp,%rsi
  call   <memcpy@plt>
  mov    0x2c(%rsp),%r8d
  test   %r8d,%r8d
  js     L512
  mov    0x50(%rsp),%ecx
  sete   %al
  test   %ecx,%ecx
  sete   0x57(%rsp)
  or     0x2c(%rsp),%ecx
  je     L35
L193:
  movslq 0x44(%rsp),%rdx
  movl   $0x0,0x28(%rsp)
  mov    0x48(%rsp),%r15
  lea    0x0(,%rdx,8),%rcx
  mov    %r14d,%edx
  mov    %rcx,0x38(%rsp)
  mov    0x60(%rsp),%rcx
  neg    %edx
  movslq %edx,%rdx
  shl    $0x3,%rcx
  mov    %rcx,0x18(%rsp)
  lea    0x0(,%rdx,8),%rcx
  mov    %rcx,0x68(%rsp)
  nopl   0x0(%rax,%rax,1)
L479:
  mov    0x28(%rsp),%ebx
  movzbl %al,%ecx
  cmp    %ebx,0x2c(%rsp)
  je     L506
  mov    0x44(%rsp),%eax
  mov    %r13,%rdi
  cltd
  idiv   %r14d
  lea    (%rax,%rcx,1),%esi
  mov    %eax,%r12d
  xor    %eax,%eax
  call   <stable_binary_insertion_sort@plt>
  mov    0x40(%rsp),%eax
  cltd
  idiv   %r14d
  mov    %eax,0x20(%rsp)
  cmp    $0x1,%r12d
  jle    L320
L543:
  movq   $0x1,(%rsp)
  mov    %r14d,%eax
  xor    %ebp,%ebp
  mov    %r14d,0x10(%rsp)
  mov    %eax,%ecx
  mov    %r15,%r14
  cs nopw 0x0(%rax,%rax,1)
L3:
  mov    (%r14),%rax
  mov    %ebp,0x14(%rsp)
  mov    (%rax),%edi
  cmp    $0x1,%ecx
  jne    L0
  mov    (%rsp),%rdx
  mov    %ebp,%ebx
  lea    (%r15,%rdx,8),%rax
  jmp    L24
  xchg   %ax,%ax
L134:
  mov    %esi,%edi
  mov    %edx,%ebx
L286:
  add    $0x1,%rdx
  add    $0x8,%rax
  cmp    %edx,%r12d
  jle    L169
L24:
  mov    (%rax),%rsi
  mov    %edi,%r10d
  movslq %ebx,%r8
  mov    %rax,%r9
  lea    (%r15,%r8,8),%r11
  mov    (%rsi),%esi
  sub    %esi,%r10d
  test   %r10d,%r10d
  jg     L134
  mov    %r11,%r9
  jne    L286
  mov    0x0(%r13,%r8,8),%r9
  mov    0x0(%r13,%rdx,8),%r8
  mov    (%r8),%r8d
  cmp    %r8d,(%r9)
  cmovg  %rax,%r11
  cmovg  %esi,%edi
  cmovg  %edx,%ebx
  add    $0x1,%rdx
  add    $0x8,%rax
  mov    %r11,%r9
  cmp    %edx,%r12d
  jg     L24
  nopw   0x0(%rax,%rax,1)
L169:
  mov    %ebp,0xc(%rsp)
  cmp    %ebx,%ebp
  je     L441
  mov    %ecx,%edx
  mov    %r9,%rsi
  mov    %r14,%rdi
  xor    %eax,%eax
  mov    %ecx,0x24(%rsp)
  call   <stable_grail_swap_n@plt>
  movslq %ebx,%rax
  lea    0x0(%r13,%rbp,8),%rdi
  lea    0x0(%r13,%rax,8),%rsi
  xor    %eax,%eax
  call   <stable_grail_swap1@plt>
  mov    0x20(%rsp),%eax
  mov    0x24(%rsp),%ecx
  cmp    %ebx,%eax
  je     L162
  mov    0xc(%rsp),%r8d
  cmp    %eax,%r8d
  je     L162
L441:
  addq   $0x1,(%rsp)
  mov    (%rsp),%rax
  add    $0x1,%rbp
  add    %ecx,0x10(%rsp)
  add    0x18(%rsp),%r14
  cmp    %eax,%r12d
  jg     L3
  mov    %ecx,%r14d
  mov    0x28(%rsp),%ecx
  cmp    %ecx,0x2c(%rsp)
  je     L33
L320:
  xor    %edx,%edx
  xor    %r9d,%r9d
L508:
  movslq 0x20(%rsp),%rax
  cmpq   $0x0,0x30(%rsp)
  lea    0x0(%r13,%rax,8),%rsi
  je     L34
  sub    $0x8,%rsp
  mov    %r13,%rdi
  mov    %r14d,%r8d
  mov    %r12d,%ecx
  push   %rdx
  xor    %eax,%eax
  mov    %r15,%rdx
  call   <stable_grail_merge_buffers_left_with_x_buf@plt>
  pop    %rsi
  pop    %rdi
L413:
  addl   $0x1,0x28(%rsp)
  mov    0x28(%rsp),%eax
  cmp    %eax,0x2c(%rsp)
  jl     L83
  sete   %al
  add    0x38(%rsp),%r15
  test   %al,%al
  je     L479
  cmpb   $0x0,0x57(%rsp)
  je     L479
L83:
  cmpq   $0x0,0x30(%rsp)
  je     L41
L35:
  mov    0x60(%rsp),%rax
  mov    0x48(%rsp),%rbp
  lea    0x0(,%rax,8),%r12
  sub    %r12,%rbp
L512:
  mov    0x58(%rsp),%ecx
  sub    $0x1,%ecx
  js     L467
  mov    0x60(%rsp),%rdi
  lea    0x8(,%rdi,8),%rax
  test   %rax,%rax
  je     L22
  cmp    $0x2,%ecx
  jbe    L22
  movslq 0x58(%rsp),%rax
  mov    0x48(%rsp),%rsi
  mov    %rax,%rbx
  mov    %rax,%rdx
  sub    %rdi,%rdx
  shr    %ebx
  lea    -0x10(%rsi,%rdx,8),%rdi
  mov    %ebx,%edx
  lea    -0x10(%rsi,%rax,8),%rsi
  xor    %eax,%eax
  neg    %rdx
  shl    $0x4,%rdx
L265:
  movdqu (%rdi,%rax,1),%xmm0
  movups %xmm0,(%rsi,%rax,1)
  sub    $0x10,%rax
  cmp    %rdx,%rax
  jne    L265
  mov    0x58(%rsp),%ebx
  mov    %ecx,%eax
  mov    %ebx,%edx
  and    $0xfffffffe,%edx
  sub    %edx,%eax
  cmp    %ebx,%edx
  je     L467
  mov    %eax,%edx
  mov    0x48(%rsp),%rcx
  cltq
  sub    %r14d,%edx
  movslq %edx,%rdx
  mov    (%rcx,%rdx,8),%rdx
  mov    %rdx,(%rcx,%rax,8)
L467:
  mov    0x30(%rsp),%rsi
  add    $0x78,%rsp
  mov    %r12,%rdx
  mov    %rbp,%rdi
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    10d0 <memcpy@plt>
  nopl   0x0(%rax,%rax,1)
L162:
  mov    0x14(%rsp),%eax
  xor    0x20(%rsp),%eax
  xor    %ebx,%eax
  mov    %eax,0x20(%rsp)
  jmp    L441
  nopl   0x0(%rax,%rax,1)
L0:
  movslq 0x10(%rsp),%rax
  mov    (%rsp),%rdx
  mov    %ebp,%ebx
  mov    0x18(%rsp),%r10
  lea    (%r15,%rax,8),%rax
  jmp    L202
  xchg   %ax,%ax
L537:
  mov    %esi,%edi
  mov    %edx,%ebx
L356:
  add    $0x1,%rdx
  add    %r10,%rax
  cmp    %edx,%r12d
  jle    L169
L202:
  mov    %ecx,%esi
  mov    %edi,%r8d
  mov    %rax,%r9
  imul   %ebx,%esi
  movslq %esi,%rsi
  lea    (%r15,%rsi,8),%r11
  mov    (%rax),%rsi
  mov    (%rsi),%esi
  sub    %esi,%r8d
  test   %r8d,%r8d
  jg     L537
  mov    %r11,%r9
  jne    L356
  movslq %ebx,%r8
  mov    0x0(%r13,%r8,8),%r9
  mov    0x0(%r13,%rdx,8),%r8
  mov    (%r8),%r8d
  cmp    %r8d,(%r9)
  cmovg  %rax,%r11
  cmovg  %esi,%edi
  cmovg  %edx,%ebx
  mov    %r11,%r9
  jmp    L356
L34:
  push   %rdx
  mov    %r12d,%ecx
  mov    %r15,%rdx
  mov    %r14d,%r8d
  push   %r9
  mov    0x6c(%rsp),%r9d
  mov    %r13,%rdi
  xor    %eax,%eax
  call   <stable_grail_merge_buffers_left@plt>
  pop    %rdx
  pop    %rcx
  jmp    L413
L506:
  mov    0x50(%rsp),%eax
  mov    %r13,%rdi
  cltd
  idiv   %r14d
  lea    (%rax,%rcx,1),%esi
  mov    %eax,%r12d
  xor    %eax,%eax
  mov    %edx,%ebx
  call   <stable_binary_insertion_sort@plt>
  mov    0x40(%rsp),%eax
  cltd
  idiv   %r14d
  mov    %eax,0x20(%rsp)
  cmp    $0x1,%r12d
  jg     L543
  mov    %ebx,%edx
  test   %ebx,%ebx
  je     L320
  xor    %r9d,%r9d
  test   %r12d,%r12d
  jle    L508
L417:
  mov    %r14d,%eax
  imul   %r12d,%eax
  movslq %eax,%rcx
  mov    (%r15,%rcx,8),%rcx
  mov    (%rcx),%esi
  cmp    $0x1,%r14d
  jne    L210
  movslq %r12d,%rax
  xor    %r9d,%r9d
  lea    (%r15,%rax,8),%rax
  jmp    L476
L173:
  add    $0x1,%r9d
  sub    $0x8,%rax
  cmp    %r12d,%r9d
  je     L244
L476:
  mov    -0x8(%rax),%rcx
  mov    %r12d,%edi
  sub    %r9d,%edi
  cmp    (%rcx),%esi
  jl     L173
  mov    %edi,%r12d
  xor    %edx,%edx
  jmp    L508
L33:
  mov    0x50(%rsp),%eax
  cltd
  idiv   %r14d
  test   %edx,%edx
  je     L320
  jmp    L417
L252:
  mov    0x2c(%rsp),%ecx
  test   %ecx,%ecx
  js     L41
  mov    0x50(%rsp),%ebx
  sete   %al
  test   %ebx,%ebx
  sete   0x57(%rsp)
  or     %ecx,%ebx
  je     L41
  movslq %r14d,%rcx
  mov    %rcx,0x60(%rsp)
  jmp    L193
L41:
  mov    0x5c(%rsp),%eax
  test   %eax,%eax
  je     L62
  mov    0x58(%rsp),%eax
  sub    $0x1,%eax
  js     L62
  mov    0x48(%rsp),%rcx
  movslq %eax,%rdx
  movslq %r14d,%rbp
  mov    %eax,%eax
  shl    $0x3,%rdx
  shl    $0x3,%rax
  neg    %rbp
  lea    -0x8(%rcx,%rdx,1),%r12
  lea    (%rcx,%rdx,1),%rbx
  shl    $0x3,%rbp
  sub    %rax,%r12
L337:
  lea    (%rbx,%rbp,1),%rsi
  mov    %rbx,%rdi
  xor    %eax,%eax
  sub    $0x8,%rbx
  call   <stable_grail_swap1@plt>
  cmp    %r12,%rbx
  jne    L337
L62:
  add    $0x78,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L244:
  xor    %r12d,%r12d
  jmp    L508
L22:
  movslq %ecx,%rax
L92:
  mov    0x0(%rbp,%rax,8),%rdx
  mov    0x48(%rsp),%rcx
  mov    %rdx,(%rcx,%rax,8)
  sub    $0x1,%rax
  test   %eax,%eax
  jns    L92
  jmp    L467
L210:
  sub    %r14d,%eax
  xor    %r9d,%r9d
  cltq
  lea    (%r15,%rax,8),%rax
  jmp    L240
L452:
  add    $0x1,%r9d
  add    0x68(%rsp),%rax
  cmp    %r12d,%r9d
  je     L244
L240:
  mov    (%rax),%rcx
  mov    %r12d,%edi
  sub    %r9d,%edi
  cmp    (%rcx),%esi
  jl     L452
  mov    %edi,%r12d
  jmp    L508
```

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);
    }
  }
}
```