user: 下面的汇编指令对应的C源代码是什么:

```asm
<relax_gauss>:
  endbr64
  push   %r15
  mov    %esi,%eax
  movsd  D9(%rip),%xmm3
  mov    %rdi,%rcx
  push   %r14
  sub    $0x2,%eax
  mov    %edx,%r15d
  pxor   %xmm2,%xmm2
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %esi,%ebx
  mov    %edx,%esi
  shr    $0x3,%ebx
  shr    $0x3,%esi
  mov    %ebx,-0x14(%rsp)
  mov    %eax,-0x10(%rsp)
  mov    %ebx,%eax
  imul   %edx,%ebx
  sub    $0x1,%eax
  mov    %esi,-0x28(%rsp)
  mov    %eax,-0x4(%rsp)
  lea    -0x2(%rdx),%eax
  mov    %ebx,-0xc(%rsp)
  mov    %edx,-0x20(%rsp)
  movl   $0x1,-0x2c(%rsp)
  movl   $0x8,-0x8(%rsp)
  mov    %eax,-0x18(%rsp)
L52:
  mov    -0x10(%rsp),%ebx
  mov    -0x4(%rsp),%eax
  movl   $0x8,-0x1c(%rsp)
  mov    $0x1,%r12d
  add    -0x2c(%rsp),%eax
  cmp    %ebx,%eax
  cmova  %ebx,%eax
  xor    %r13d,%r13d
  mov    %eax,%r14d
  nopl   0x0(%rax,%rax,1)
L21:
  mov    -0x28(%rsp),%eax
  cmp    -0x2c(%rsp),%r14d
  jb     L28
  lea    (%rax,%r13,1),%r9d
  mov    -0x18(%rsp),%eax
  mov    -0x20(%rsp),%edx
  mov    %r9d,-0x24(%rsp)
  mov    -0x2c(%rsp),%ebx
  cmp    %r9d,%eax
  cmovbe %eax,%r9d
  nopl   0x0(%rax,%rax,1)
L26:
  add    $0x1,%ebx
  lea    (%r15,%rdx,1),%r10d
  cmp    %r12d,%r9d
  jb     L27
  mov    $0x1,%esi
  mov    $0x1,%edi
  lea    0x0(%r13,%rdx,1),%eax
  lea    (%r15,%rdx,1),%r10d
  sub    %r15d,%esi
  lea    0x1(%r15),%r8d
  sub    %edx,%edi
  nopl   0x0(%rax,%rax,1)
L3:
  mov    %eax,%r11d
  add    $0x1,%eax
  mov    %r11,%rdx
  lea    0x2(%r11),%ebp
  add    %r8d,%edx
  movsd  (%rcx,%rbp,8),%xmm0
  addsd  (%rcx,%r11,8),%xmm0
  lea    (%rsi,%r11,1),%r11d
  mov    %edx,%edx
  addsd  (%rcx,%r11,8),%xmm0
  addsd  (%rcx,%rdx,8),%xmm0
  mov    %eax,%edx
  lea    (%rcx,%rdx,8),%rdx
  mulsd  %xmm3,%xmm0
  movapd %xmm0,%xmm1
  subsd  (%rdx),%xmm1
  movsd  %xmm0,(%rdx)
  lea    (%rdi,%rax,1),%edx
  mulsd  %xmm1,%xmm1
  addsd  %xmm1,%xmm2
  cmp    %edx,%r9d
  jae    L3
L27:
  mov    %r10d,%edx
  cmp    %ebx,%r14d
  jae    L26
L59:
  add    -0x28(%rsp),%r12d
  subl   $0x1,-0x1c(%rsp)
  mov    -0x24(%rsp),%r13d
  jne    L21
  mov    -0x14(%rsp),%ebx
  add    %ebx,-0x2c(%rsp)
  mov    -0xc(%rsp),%ebx
  add    %ebx,-0x20(%rsp)
  subl   $0x1,-0x8(%rsp)
  jne    L52
  pop    %rbx
  movapd %xmm2,%xmm0
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L28:
  add    %r13d,%eax
  mov    %eax,-0x24(%rsp)
  jmp    L59
```

tool_calls: name: disassemble_data
arguments: data_label: D9
datatype: f64

tool: D9: 0.25

assistant: ```c
double relax_gauss(double *u, unsigned sizex, unsigned sizey) {
  double unew, diff, sum = 0.0;
  int nbx, bx, nby, by;
  nbx = 8;
  bx = sizex / nbx;
  nby = 8;
  by = sizey / nby;
  for (int ii = 0; ii < nbx; ii++)
    for (int jj = 0; jj < nby; jj++)
      for (int i = 1 + ii * bx; i <= ((((ii + 1) * bx) < (sizex - 2)) ? ((ii + 1) * bx) : (sizex - 2)); i++)
        for (int j = 1 + jj * by; j <= ((((jj + 1) * by) < (sizey - 2)) ? ((jj + 1) * by) : (sizey - 2)); j++) {
          unew = 0.25 * (u[i * sizey + (j - 1)] + u[i * sizey + (j + 1)] + u[(i - 1) * sizey + j] + u[(i + 1) * sizey + j]);
          diff = unew - u[i * sizey + j];
          sum += diff * diff;
          u[i * sizey + j] = unew;
        }
  return sum;
}
```