user: 这段汇编代码用C语言表示是什么样的：

```asm
<k_choldc>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x78,%rsp
  mov    %rdx,0x8(%rsp)
  test   %esi,%esi
  jle    L53
  lea    0x1(%rsi),%eax
  mov    %rdi,%r9
  movl   $0x0,0x50(%rsp)
  mov    %esi,%edi
  mov    %eax,0x54(%rsp)
  movslq %esi,%rax
  mov    %r9,%r8
  lea    -0x10(%r9),%r12
  mov    %rax,0x68(%rsp)
  shl    $0x2,%rax
  mov    $0xffffffff,%r10d
  xor    %r15d,%r15d
  mov    %rax,0x58(%rsp)
  add    $0x4,%rax
  mov    %r9,%r14
  mov    %rax,0x60(%rsp)
  movl   $0x0,0x4c(%rsp)
L99:
  mov    %r15d,%eax
  mov    %r10d,%ecx
  mov    0x50(%rsp),%edx
  mov    0x4c(%rsp),%r13d
  shr    $0x2,%eax
  mov    %r15d,%esi
  mov    %r15,%rbp
  lea    -0x1(%rax),%ebx
  mov    %r15d,%eax
  and    $0xfffffffc,%eax
  not    %rbx
  sub    %eax,%ecx
  mov    %eax,0x18(%rsp)
  shl    $0x4,%rbx
  cmp    $0x2,%r10d
  mov    %ecx,%eax
  cmovbe %r10d,%eax
  mov    %eax,%ecx
  mov    %eax,0x1c(%rsp)
  add    %edx,%eax
  cltq
  lea    -0x1(%rcx),%r9d
  lea    -0x2(%rcx),%r11d
  lea    (%r14,%rax,4),%rax
  mov    %rax,0x10(%rsp)
  lea    (%r9,%rdx,1),%eax
  cltq
  lea    (%r14,%rax,4),%rax
  mov    %rax,0x20(%rsp)
  lea    (%r11,%rdx,1),%eax
  cltq
  lea    (%r14,%rax,4),%rax
  mov    %rax,0x28(%rsp)
  nopl   0x0(%rax)
L92:
  movss  (%r8,%rbp,4),%xmm1
  cmp    $0xffffffff,%r10d
  je     L77
  mov    %r13d,%edx
  sub    %esi,%edx
  cmp    $0x2,%r10d
  jbe    L45
  movslq %edx,%rax
  add    %r15,%rax
  lea    -0x10(%r14,%rax,4),%rcx
  xor    %eax,%eax
  nopl   0x0(%rax,%rax,1)
L105:
  movups (%rcx,%rax,1),%xmm0
  movups (%r12,%rax,1),%xmm2
  sub    $0x10,%rax
  shufps $0x1b,%xmm2,%xmm2
  shufps $0x1b,%xmm0,%xmm0
  mulps  %xmm2,%xmm0
  subss  %xmm0,%xmm1
  movaps %xmm0,%xmm2
  shufps $0x55,%xmm0,%xmm2
  subss  %xmm2,%xmm1
  movaps %xmm0,%xmm2
  unpckhps %xmm0,%xmm2
  shufps $0xff,%xmm0,%xmm0
  subss  %xmm2,%xmm1
  subss  %xmm0,%xmm1
  cmp    %rbx,%rax
  jne    L105
  cmp    %esi,0x18(%rsp)
  je     L77
L45:
  mov    0x1c(%rsp),%eax
  add    %edx,%eax
  cltq
  movss  (%r14,%rax,4),%xmm0
  mov    0x10(%rsp),%rax
  mulss  (%rax),%xmm0
  subss  %xmm0,%xmm1
  cmp    $0xffffffff,%r9d
  je     L77
  lea    (%r9,%rdx,1),%eax
  cltq
  movss  (%r14,%rax,4),%xmm0
  mov    0x20(%rsp),%rax
  mulss  (%rax),%xmm0
  subss  %xmm0,%xmm1
  cmp    $0xffffffff,%r11d
  je     L77
  mov    0x28(%rsp),%rax
  add    %r11d,%edx
  movslq %edx,%rdx
  movss  (%r14,%rdx,4),%xmm0
  mulss  (%rax),%xmm0
  subss  %xmm0,%xmm1
L77:
  cmp    %r15d,%ebp
  je     L103
  mov    0x8(%rsp),%rdx
  movslq %r13d,%rax
  divss  (%rdx,%r15,4),%xmm1
  movss  %xmm1,(%r14,%rax,4)
L10:
  add    $0x1,%rbp
  add    %edi,%r13d
  cmp    %ebp,%edi
  jg     L92
  mov    0x54(%rsp),%esi
  add    %edi,0x50(%rsp)
  add    $0x1,%r15
  add    $0x1,%r10d
  add    %esi,0x4c(%rsp)
  add    0x58(%rsp),%r8
  add    0x60(%rsp),%r12
  cmp    0x68(%rsp),%r15
  jne    L99
L53:
  add    $0x78,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   (%rax)
L103:
  pxor   %xmm5,%xmm5
  mov    %edi,0x48(%rsp)
  comiss %xmm1,%xmm5
  mov    %esi,0x44(%rsp)
  mov    %r10d,0x40(%rsp)
  mov    %r8,0x38(%rsp)
  mov    %r11d,0x34(%rsp)
  mov    %r9d,0x30(%rsp)
  jae    L53
  movaps %xmm1,%xmm0
  call   <sqrt@plt>
  mov    0x8(%rsp),%rax
  mov    0x30(%rsp),%r9d
  mov    0x34(%rsp),%r11d
  mov    0x38(%rsp),%r8
  mov    0x40(%rsp),%r10d
  mov    0x44(%rsp),%esi
  movss  %xmm0,(%rax,%r15,4)
  mov    0x48(%rsp),%edi
  jmp    L10
```

assistant: ```c
void k_choldc(float *a, int n, float p[]) {
  int i, j, k;
  float sum;
  for (i = 0; i < n; i++) {
    for (j = i; j < n; j++) {
      for (sum = a[i * n + j], k = i - 1; k >= 0; k--)
        sum -= a[i * n + k] * a[j * n + k];
      if (i == j) {
        if (sum <= 0.0)
          return;
        p[i] = sqrt(sum);
      } else
        a[j * n + i] = sum / p[i];
    }
  }
}
```