user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<gauss_seidel>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x28,%rsp
  mov    %rdi,(%rsp)
  mov    %r8d,0x1c(%rsp)
  test   %ecx,%ecx
  jle    L36
  mov    %ecx,%eax
  movslq %ecx,%r13
  mov    %ecx,%edi
  mov    %rdx,%r14
  shr    %eax
  movapd %xmm0,%xmm5
  lea    0x0(,%r13,8),%r9
  xor    %edx,%edx
  lea    -0x1(%rax),%r8d
  and    $0xfffffffe,%edi
  add    $0x1,%r8
  shl    $0x4,%r8
  nopl   0x0(%rax)
L151:
  mov    (%rsp),%rax
  mov    (%rax,%rdx,1),%r10
  movsd  (%r10,%rdx,1),%xmm1
  cmp    $0x1,%ecx
  je     L146
  movapd %xmm1,%xmm2
  mov    %r10,%rax
  lea    (%r8,%r10,1),%r11
  unpcklpd %xmm2,%xmm2
  cs nopw 0x0(%rax,%rax,1)
L158:
  movupd (%rax),%xmm0
  add    $0x10,%rax
  divpd  %xmm2,%xmm0
  movups %xmm0,-0x10(%rax)
  cmp    %r11,%rax
  jne    L158
  movslq %edi,%rax
  cmp    %ecx,%edi
  je     L68
L178:
  lea    (%r10,%rax,8),%rax
  movsd  (%rax),%xmm0
  divsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
L68:
  movsd  (%rsi,%rdx,1),%xmm0
  divsd  %xmm1,%xmm0
  movsd  %xmm0,(%rsi,%rdx,1)
  add    $0x8,%rdx
  cmp    %r9,%rdx
  jne    L151
  mov    (%rsp),%rdi
  xor    %edx,%edx
  nopl   0x0(%rax)
L175:
  movsd  (%rsi,%rdx,8),%xmm1
  xor    %eax,%eax
  nopw   0x0(%rax,%rax,1)
L108:
  cmp    %eax,%edx
  je     L125
  mov    (%rdi),%rcx
  movsd  (%rcx,%rax,8),%xmm0
  mulsd  (%r14,%rax,8),%xmm0
  subsd  %xmm0,%xmm1
L125:
  add    $0x1,%rax
  cmp    %r13,%rax
  jne    L108
  movsd  %xmm1,(%r14,%rdx,8)
  add    $0x1,%rdx
  add    $0x8,%rdi
  cmp    %r13,%rdx
  jne    L175
  mov    $0x1,%ebp
  mov    $0x1,%r12d
  pxor   %xmm3,%xmm3
  nopl   0x0(%rax)
L163:
  mov    (%rsp),%r15
  xor    %ebx,%ebx
  xchg   %ax,%ax
L37:
  movsd  (%r14,%rbx,8),%xmm2
  movsd  (%rsi,%rbx,8),%xmm1
  xor    %eax,%eax
  nopl   (%rax)
L164:
  cmp    %eax,%ebx
  je     L153
  mov    (%r15),%rdx
  movsd  (%rdx,%rax,8),%xmm0
  mulsd  (%r14,%rax,8),%xmm0
  subsd  %xmm0,%xmm1
L153:
  add    $0x1,%rax
  cmp    %rax,%r13
  jne    L164
  movapd %xmm2,%xmm0
  mulsd  %xmm3,%xmm0
  addsd  %xmm0,%xmm1
  movsd  %xmm1,(%r14,%rbx,8)
  cmp    $0x1,%ebp
  je     L123
L118:
  add    $0x1,%rbx
  add    $0x8,%r15
  comisd %xmm5,%xmm4
  jb     L3
  xor    %ebp,%ebp
L3:
  cmp    %rbx,%r13
  jne    L37
  mov    %ebp,%edx
  add    $0x1,%r12d
  xor    $0x1,%edx
  cmp    0x1c(%rsp),%r12d
  setle  %al
  xor    %ebp,%ebp
  test   %al,%dl
  jne    L163
L36:
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax)
L123:
  ucomisd (%r14),%xmm3
  jp     L48
  je     L118
L48:
  movapd %xmm1,%xmm0
  mov    %rsi,0x8(%rsp)
  subsd  %xmm2,%xmm0
  movsd  %xmm5,0x10(%rsp)
  divsd  %xmm1,%xmm0
  call   <fabs@plt>
  pxor   %xmm4,%xmm4
  movsd  0x10(%rsp),%xmm5
  mov    0x8(%rsp),%rsi
  imul   $0x64,%eax,%eax
  pxor   %xmm3,%xmm3
  cvtsi2sd %eax,%xmm4
  jmp    L118
L146:
  xor    %eax,%eax
  jmp    L178
```

assistant: ```c
void gauss_seidel(double **m, double *r, double *s, int n, int imax, double es) {
  int i, j, iter, cent;
  double sum, dummy, ea, old, lambda = 1;
  for (i = 0; i <= n - 1; i++) {
    dummy = m[i][i];
    for (j = 0; j <= n - 1; j++) {
      m[i][j] = m[i][j] / dummy;
    }
    r[i] = r[i] / dummy;
  }
  for (i = 0; i <= n - 1; i++) {
    sum = r[i];
    for (j = 0; j <= n - 1; j++) {
      if (i != j)
        sum = sum - m[i][j] * s[j];
    }
    s[i] = sum;
  }
  iter = 1;
  cent = 1;
  do {
    for (i = 0; i <= n - 1; i++) {
      old = s[i];
      sum = r[i];
      for (j = 0; j <= n - 1; j++) {
        if (i != j)
          sum = sum - m[i][j] * s[j];
      }
      s[i] = lambda * sum + (1 - lambda) * old;
      if (cent == 1 && s[0] != 0)
        ea = fabs((s[i] - old) / s[i]) * 100;
      if (ea >= es)
        cent = 0;
    }
    iter += 1;
  } while (cent == 0 && iter <= imax);
}
```