user: 这段汇编代码用C语言表示是什么样的:

```asm
<matmac>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x68,%rsp
  mov    %rdi,0x8(%rsp)
  mov    %rsi,0x10(%rsp)
  mov    %rdx,0x18(%rsp)
  mov    %fs:0x28,%rax
  mov    %rax,0x58(%rsp)
  xor    %eax,%eax
  test   %ecx,%ecx
  jle    L31
  mov    %ecx,%r13d
  movslq %ecx,%r10
  shl    $0x2,%r10
  mov    $0x0,%r15d
  mov    $0x0,%r14d
  lea    -0x1(%rcx),%eax
  mov    %rax,0x20(%rsp)
  lea    0x4(%rdi),%rax
  mov    %rax,0x28(%rsp)
  lea    0x50(%rsp),%r8
  jmp    L88
L99:
  add    $0x4,%rsi
  add    %r10,%rdi
  cmp    %r9,%rsi
  je     L61
L59:
  movss  (%rsi),%xmm4
  lea    0x30(%rsp),%rcx
  mov    %rcx,%rax
  mov    %rdi,%rdx
L38:
  movss  (%rdx),%xmm3
  movss  0x4(%rdx),%xmm2
  movss  0x8(%rdx),%xmm1
  movss  0xc(%rdx),%xmm0
  mulss  %xmm4,%xmm3
  addss  (%rax),%xmm3
  movss  %xmm3,(%rax)
  mulss  %xmm4,%xmm2
  addss  0x4(%rax),%xmm2
  movss  %xmm2,0x4(%rax)
  mulss  %xmm4,%xmm1
  addss  0x8(%rax),%xmm1
  movss  %xmm1,0x8(%rax)
  mulss  %xmm4,%xmm0
  addss  0xc(%rax),%xmm0
  movss  %xmm0,0xc(%rax)
  add    $0x10,%rdx
  add    $0x10,%rax
  cmp    %r8,%rax
  jne    L38
  jmp    L99
L61:
  mov    %rbp,%rax
L16:
  movss  (%rax),%xmm0
  addss  (%rcx),%xmm0
  movss  %xmm0,(%rax)
  add    $0x4,%rax
  add    $0x4,%rcx
  cmp    %r8,%rcx
  jne    L16
  add    $0x20,%rbp
  add    $0x20,%rbx
  add    $0x8,%r11
  cmp    %r11d,%r13d
  jle    L42
L74:
  movl   $0x0,0x30(%rsp)
  movl   $0x0,0x34(%rsp)
  movl   $0x0,0x38(%rsp)
  movl   $0x0,0x3c(%rsp)
  movl   $0x0,0x40(%rsp)
  movl   $0x0,0x44(%rsp)
  movl   $0x0,0x48(%rsp)
  movl   $0x0,0x4c(%rsp)
  mov    %rbx,%rdi
  mov    %r12,%rsi
  jmp    L59
L42:
  add    $0x1,%r14d
  add    %r13d,%r15d
  cmp    %r14d,%r13d
  je     L31
L88:
  movslq %r15d,%rax
  lea    0x0(,%rax,4),%r12
  mov    0x18(%rsp),%rbx
  lea    (%rbx,%r12,1),%rbp
  mov    0x10(%rsp),%rbx
  add    0x8(%rsp),%r12
  add    0x20(%rsp),%rax
  mov    0x28(%rsp),%rdi
  lea    (%rdi,%rax,4),%r9
  mov    $0x0,%r11d
  jmp    L74
L31:
  mov    0x58(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L53
  add    $0x68,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L53:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
void matmac(volatile float *restrict aa, volatile float *restrict bb, volatile float *restrict cc, int NN) {
  int i = 0;
  for (i = 0; i < NN; i++) {
    int j0, j1;
    for (j0 = 0; j0 < NN; j0 += 8) {
      int x;
      float tot[8];
      for (j1 = 0; j1 < 8; j1++) {
        tot[j1] = 0.0;
      }
      for (x = 0; x < NN; x++) {
        float tmp = *(aa + (i * NN) + x);
        for (j1 = 0; j1 < 8; j1 += 4) {
          float tmp2[4];
          tmp2[0] = *(bb + (x * NN) + j0 + j1 + 0);
          tmp2[1] = *(bb + (x * NN) + j0 + j1 + 1);
          tmp2[2] = *(bb + (x * NN) + j0 + j1 + 2);
          tmp2[3] = *(bb + (x * NN) + j0 + j1 + 3);
          tot[j1 + 0] += tmp * tmp2[0];
          tot[j1 + 1] += tmp * tmp2[1];
          tot[j1 + 2] += tmp * tmp2[2];
          tot[j1 + 3] += tmp * tmp2[3];
        }
      }
      for (j1 = 0; j1 < 8; j1 += 1) {
        *(cc + (i * NN) + j0 + j1) += tot[j1];
      }
    }
  }
  return;
}
```