user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<multiplica>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  mov    %rdi,0x18(%rsp)
  mov    %rsi,%rbx
  mov    %rdx,%r15
  mov    %rdx,0x20(%rsp)
  mov    %ecx,%r14d
  mov    %r8d,0x28(%rsp)
  mov    $0x180,%edx
  mov    $0x3e8,%esi
  mov    D6(%rip),%rax
  mov    (%rax),%edi
  call   <shmget@plt>
  test   %r14d,%r14d
  jle    L228
  mov    %eax,%r12d
  mov    %r15,%rbp
  lea    -0x1(%r14),%eax
  lea    0x8(%r15,%rax,8),%r13
L16:
  mov    $0x0,%edx
  mov    $0x0,%esi
  mov    %r12d,%edi
  call   <shmat@plt>
  mov    %rax,0x0(%rbp)
  add    $0x8,%rbp
  cmp    %r13,%rbp
  jne    L16
L228:
  mov    $0x180,%edx
  mov    $0x4,%esi
  mov    D6(%rip),%rax
  mov    (%rax),%edi
  call   <shmget@plt>
  mov    %eax,%edi
  mov    $0x0,%edx
  mov    $0x0,%esi
  call   <shmat@plt>
  mov    %rax,%r15
  mov    0x28(%rsp),%edi
  cmp    %edi,%r14d
  jl     L87
  mov    %r14d,%eax
  cltd
  idiv   %edi
  mov    %edx,0x2c(%rsp)
  test   %edi,%edi
  jle    L91
  mov    %r14d,%eax
  cltd
  idiv   %edi
  mov    %eax,0xc(%rsp)
  mov    0x20(%rsp),%rsi
  mov    %rsi,%rbp
  mov    0x18(%rsp),%r12
  lea    -0x1(%rdi),%eax
  lea    0x8(%rsi,%rax,8),%rax
  mov    %rax,0x10(%rsp)
  lea    -0x1(%r14),%eax
  lea    0x4(,%rax,4),%r13
  movl   $0x0,0x8(%rsp)
  jmp    L166
L175:
  mov    %rsi,%rcx
  add    0x0(%rbp),%rcx
  mov    (%r12),%rdx
  mov    (%rbx,%rax,2),%rdi
  mov    (%rdx,%rax,1),%edx
  imul   (%rdi,%rsi,1),%edx
  add    %edx,(%rcx)
  add    $0x4,%rax
  cmp    %r13,%rax
  jne    L175
L220:
  add    $0x1,%r8d
  add    $0x4,%rsi
  cmp    %r8d,(%r15)
  jle    L74
L23:
  mov    $0x0,%eax
  test   %r14d,%r14d
  jg     L175
  jmp    L220
L74:
  mov    $0x1,%edi
  call   <exit@plt>
L193:
  mov    0xc(%rsp),%edi
  add    %edi,0x8(%rsp)
  add    $0x8,%rbp
  add    $0x8,%r12
  cmp    0x10(%rsp),%rbp
  je     L51
L166:
  call   <fork@plt>
  test   %eax,%eax
  jne    L193
  mov    0x8(%rsp),%edi
  mov    %edi,%r8d
  mov    %edi,%eax
  add    0xc(%rsp),%eax
  mov    %eax,(%r15)
  cmp    %eax,%edi
  jge    L74
  movslq %edi,%rsi
  shl    $0x2,%rsi
  jmp    L23
L58:
  mov    %rsi,%rcx
  add    (%r11),%rcx
  mov    (%r8),%rdx
  mov    (%rbx,%rax,2),%rdi
  mov    (%rdx,%rax,1),%edx
  imul   (%rdi,%rsi,1),%edx
  add    %edx,(%rcx)
  add    $0x4,%rax
  cmp    %r9,%rax
  jne    L58
L45:
  add    $0x4,%rsi
  cmp    %rsi,%r10
  je     L69
L78:
  mov    $0x0,%eax
  test   %r14d,%r14d
  jg     L58
  jmp    L45
L69:
  cmpl   $0x0,0x28(%rsp)
  jle    L87
L28:
  mov    $0x0,%ebx
  mov    0x28(%rsp),%ebp
L171:
  mov    $0x0,%edi
  call   <wait@plt>
  add    $0x1,%ebx
  cmp    %ebx,%ebp
  jg     L171
L87:
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L51:
  mov    0x28(%rsp),%eax
  cmpl   $0x0,0x2c(%rsp)
  je     L28
L180:
  mov    (%r15),%edx
  cmp    %edx,%r14d
  jle    L69
  movslq %eax,%r8
  shl    $0x3,%r8
  mov    0x20(%rsp),%r11
  add    %r8,%r11
  add    0x18(%rsp),%r8
  movslq %edx,%rcx
  lea    0x0(,%rcx,4),%rsi
  lea    -0x1(%r14),%eax
  mov    %eax,%edi
  sub    %edx,%edi
  lea    0x1(%rcx,%rdi,1),%r10
  shl    $0x2,%r10
  mov    %eax,%eax
  lea    0x4(,%rax,4),%r9
  jmp    L78
L91:
  cmpl   $0x0,0x2c(%rsp)
  je     L87
  mov    $0x0,%eax
  jmp    L180
```

assistant: ```c
void multiplica(int **m1, int **m2, int **m3, int tam, int nthreads) {
  int min, *max, i, l, c;
  int mrId = shmget(IPC_PRIVATE, 1000, 0600);
  for (i = 0; i < tam; i++)
    m3[i] = shmat(mrId, NULL, NULL);
  int maxId = shmget(IPC_PRIVATE, sizeof(int), 0600);
  max = shmat(maxId, NULL, NULL);
  int num = tam / nthreads;
  int resto = tam % nthreads;
  if (nthreads == tam || nthreads < tam) {
    for (l = 0; l < nthreads; l++) {
      int thread = fork();
      if (thread == 0) {
        min = l * num;
        *max = num * (l + 1);
        for (c = min; c < *max; c++)
          for (i = 0; i < tam; i++)
            m3[l][c] = m3[l][c] + (m1[l][i] * m2[i][c]);
        exit(1);
      }
    }
    if (resto != 0)
      for (c = *max; c < tam; c++)
        for (i = 0; i < tam; i++)
          m3[l][c] = m3[l][c] + (m1[l][i] * m2[i][c]);
    for (l = 0; l < nthreads; l++)
      wait(NULL);
  }
}
```