user: 这段汇编代码用C语言表示是什么样的:

```asm
<gauss_elim>:
  endbr64
  push   %r15
  mov    %rdi,%r15
  push   %r14
  push   %r13
  xor    %r13d,%r13d
  push   %r12
  mov    $0x7,%r12d
  push   %rbp
  mov    %rdi,%rbp
  push   %rbx
  mov    %rdi,%rbx
  sub    $0x28,%rsp
  mov    %rdi,0x18(%rsp)
  movq   $0xc0,0x8(%rsp)
L27:
  mov    %r13,%r14
  nopl   (%rax)
L79:
  mov    %r14,%rax
  shl    $0x6,%rax
  movsd  (%rbx,%rax,1),%xmm0
  call   <fabs@plt>
  test   %eax,%eax
  jg     L68
  add    $0x1,%r14
  cmp    $0x4,%r14d
  jne    L79
L78:
  movslq 0x14(%rsp),%rax
  mov    %rbp,%rsi
  cmp    %r13d,%eax
  je     L37
  shl    $0x6,%rax
  add    0x18(%rsp),%rax
  movsd  0x0(%rbp),%xmm0
  movsd  (%rax),%xmm1
  movsd  %xmm1,0x0(%rbp)
  movsd  0x8(%rax),%xmm1
  movsd  %xmm0,(%rax)
  movsd  0x8(%rbp),%xmm0
  movsd  %xmm1,0x8(%rbp)
  movsd  0x10(%rax),%xmm1
  movsd  %xmm0,0x8(%rax)
  movsd  0x10(%rbp),%xmm0
  movsd  %xmm1,0x10(%rbp)
  movsd  0x18(%rax),%xmm1
  movsd  %xmm0,0x10(%rax)
  movsd  0x18(%rbp),%xmm0
  movsd  %xmm1,0x18(%rbp)
  movsd  0x20(%rax),%xmm1
  movsd  %xmm0,0x18(%rax)
  movsd  0x20(%rbp),%xmm0
  movsd  %xmm1,0x20(%rbp)
  movsd  0x28(%rax),%xmm1
  movsd  %xmm0,0x20(%rax)
  movsd  0x28(%rbp),%xmm0
  movsd  %xmm1,0x28(%rbp)
  movsd  0x30(%rax),%xmm1
  movsd  %xmm0,0x28(%rax)
  movsd  0x30(%rbp),%xmm0
  movsd  %xmm1,0x30(%rbp)
  movsd  0x38(%rax),%xmm1
  movsd  %xmm0,0x30(%rax)
  movsd  0x38(%rbp),%xmm0
  movsd  %xmm1,0x38(%rbp)
  movsd  %xmm0,0x38(%rax)
L37:
  mov    %r12d,%r10d
  add    $0x40,%rbp
  mov    %r12d,%r9d
  mov    0x8(%rsp),%rdi
  and    $0xfffffffe,%r10d
  shr    %r9d
  mov    %rbp,%rdx
  mov    %r15,%rcx
  lea    0x1(%r10,%r13,1),%eax
  xor    %r8d,%r8d
  cltq
L4:
  movupd 0x8(%r15),%xmm1
  movsd  0x40(%rcx),%xmm0
  xorpd  D7(%rip),%xmm0
  divsd  (%r15),%xmm0
  movapd %xmm0,%xmm2
  movupd 0x48(%rcx),%xmm3
  unpcklpd %xmm2,%xmm2
  mulpd  %xmm2,%xmm1
  addpd  %xmm3,%xmm1
  movups %xmm1,0x48(%rcx)
  cmp    $0x1,%r9d
  jbe    L87
  movupd 0x18(%r15),%xmm1
  movupd 0x58(%rcx),%xmm4
  mulpd  %xmm2,%xmm1
  addpd  %xmm4,%xmm1
  movups %xmm1,0x58(%rcx)
  cmp    $0x3,%r9d
  jne    L87
  movupd 0x28(%r15),%xmm1
  movupd 0x68(%rcx),%xmm5
  mulpd  %xmm2,%xmm1
  addpd  %xmm5,%xmm1
  movups %xmm1,0x68(%rcx)
L87:
  cmp    %r12d,%r10d
  je     L61
  mulsd  (%rsi,%rax,8),%xmm0
  addsd  (%rdx,%rax,8),%xmm0
  movsd  %xmm0,(%rdx,%rax,8)
L61:
  add    $0x40,%r8
  add    $0x40,%rcx
  add    $0x40,%rdx
  cmp    %rdi,%r8
  jne    L4
  lea    -0x40(%r8),%rax
  add    $0x1,%r13
  add    $0x48,%r15
  add    $0x8,%rbx
  mov    %rax,0x8(%rsp)
  sub    $0x1,%r12d
  cmp    $0x3,%r13
  jne    L27
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nop
L68:
  mov    %r14d,0x14(%rsp)
  jmp    L78
```

tool_calls: name: unpack_data
arguments: tag: D7
datatype: byte[16]

tool: {"D7": [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00]}

assistant: ```c
void gauss_elim(double a[4][8]) {
  int s, i, j, r;
  double det = 1;
  for (s = 0; s < 4 - 1; ++s) {
    for (i = s; i < 4; ++i)
      if (fabs(a[i][s]) > 1e-14) {
        r = i;
        break;
      }
    if (r != s)
      for (j = 0; j < 8; ++j) {
        double t = a[s][j];
        a[s][j] = a[r][j];
        a[r][j] = t;
      }
    for (i = s + 1; i < 4; ++i) {
      double f = -a[i][s] / a[s][s];
      for (j = s + 1; j < 8; ++j)
        a[i][j] += a[s][j] * f;
    }
  }
}
```