user: 下面的汇编指令对应的C源代码是什么：

```asm
<covsrt>:
  endbr64
  push   %r15
  mov    %rdx,%r9
  push   %r14
  mov    %ecx,%r14d
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  cmp    $0x1,%esi
  jle    L123
  lea    0x1(%rsi),%r10d
  mov    $0x4,%ecx
  mov    $0x2,%r8d
  nopl   0x0(%rax)
L146:
  mov    %r8,%rax
  cmp    %r8d,%esi
  jl     L12
  nopl   0x0(%rax,%rax,1)
L27:
  mov    (%rdi,%rax,8),%rdx
  add    $0x1,%rax
  movl   $0x0,(%rdx,%rcx,1)
  cmp    %eax,%esi
  jge    L27
L12:
  add    $0x1,%r8
  add    $0x4,%rcx
  cmp    %r8,%r10
  jne    L146
  mov    0x8(%rdi),%rcx
  mov    %rcx,-0x8(%rsp)
  cmp    $0x1,%r14d
  jle    L189
L156:
  lea    0x8(%rdi),%r15
  mov    $0x1,%r13d
  mov    $0x2,%r12d
  nopl   0x0(%rax,%rax,1)
L34:
  cmp    %r12d,%r14d
  jl     L131
  mov    %r14d,%edx
  movslq (%r9,%r13,4),%rbx
  mov    (%r15),%r11
  lea    0x0(,%r12,4),%rax
  sub    %r12d,%edx
  lea    0x2(%r13,%rdx,1),%r8
  mov    %rbx,%r10
  lea    (%rdi,%rbx,8),%rbp
  shl    $0x2,%rbx
  shl    $0x2,%r8
  jmp    L149
  nopl   0x0(%rax,%rax,1)
L46:
  mov    (%rdi,%rcx,8),%rdx
  add    $0x4,%rax
  movss  %xmm0,(%rdx,%rbx,1)
  cmp    %rax,%r8
  je     L131
L149:
  movslq (%r9,%rax,1),%rcx
  movss  (%r11,%rax,1),%xmm0
  cmp    %r10d,%ecx
  jg     L46
  mov    0x0(%rbp),%rdx
  add    $0x4,%rax
  movss  %xmm0,(%rdx,%rcx,4)
  cmp    %rax,%r8
  jne    L149
L131:
  add    $0x1,%r13
  add    $0x1,%r12
  add    $0x8,%r15
  cmp    %r13d,%r14d
  jg     L34
  mov    -0x8(%rsp),%rcx
  movss  0x4(%rcx),%xmm1
  test   %esi,%esi
  jle    L82
L188:
  mov    $0x1,%eax
  nopl   0x0(%rax,%rax,1)
L36:
  mov    (%rdi,%rax,8),%rdx
  lea    (%rdx,%rax,4),%rdx
  movss  (%rdx),%xmm0
  movss  %xmm0,(%rcx,%rax,4)
  add    $0x1,%rax
  movl   $0x0,(%rdx)
  cmp    %eax,%esi
  jge    L36
  movslq 0x4(%r9),%rax
  mov    (%rdi,%rax,8),%rdx
  movss  %xmm1,(%rdx,%rax,4)
  cmp    $0x1,%r14d
  jle    L73
L138:
  lea    0x1(%r14),%r10d
  mov    $0x2,%eax
  nopl   0x0(%rax,%rax,1)
L124:
  movslq (%r9,%rax,4),%rdx
  movss  (%rcx,%rax,4),%xmm0
  add    $0x1,%rax
  mov    (%rdi,%rdx,8),%r8
  movss  %xmm0,(%r8,%rdx,4)
  cmp    %rax,%r10
  jne    L124
L73:
  lea    0x1(%rsi),%r9d
  mov    $0x2,%ecx
  cmp    $0x1,%esi
  jle    L31
  nopw   0x0(%rax,%rax,1)
L233:
  mov    (%rdi,%rcx,8),%r8
  lea    0x0(,%rcx,4),%rsi
  mov    $0x1,%eax
  nopl   0x0(%rax)
L196:
  movss  (%r8,%rax,4),%xmm0
  mov    (%rdi,%rax,8),%rdx
  add    $0x1,%rax
  movss  %xmm0,(%rdx,%rsi,1)
  cmp    %rcx,%rax
  jne    L196
  add    $0x1,%rcx
  cmp    %rcx,%r9
  jne    L233
L31:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L123:
  cmp    $0x1,%ecx
  jle    L61
  mov    0x8(%rdi),%rax
  mov    %rax,-0x8(%rsp)
  jmp    L156
L82:
  movslq 0x4(%r9),%rax
  mov    (%rdi,%rax,8),%rdx
  movss  %xmm1,(%rdx,%rax,4)
  jmp    L138
L189:
  movss  0x4(%rcx),%xmm1
  jmp    L188
L61:
  mov    0x8(%rdi),%rcx
  movss  0x4(%rcx),%xmm1
  cmp    $0x1,%esi
  je     L188
  movslq 0x4(%r9),%rax
  mov    (%rdi,%rax,8),%rdx
  movss  %xmm1,(%rdx,%rax,4)
  jmp    L31
```

assistant: ```c
void covsrt(covar, ma, lista, mfit) float **covar;
int ma, lista[], mfit;
{
  int i, j;
  float swap;
  for (j = 1; j < ma; j++)
    for (i = j + 1; i <= ma; i++)
      covar[i][j] = 0.0;
  for (i = 1; i < mfit; i++)
    for (j = i + 1; j <= mfit; j++) {
      if (lista[j] > lista[i])
        covar[lista[j]][lista[i]] = covar[i][j];
      else
        covar[lista[i]][lista[j]] = covar[i][j];
    }
  swap = covar[1][1];
  for (j = 1; j <= ma; j++) {
    covar[1][j] = covar[j][j];
    covar[j][j] = 0.0;
  }
  covar[lista[1]][lista[1]] = swap;
  for (j = 2; j <= mfit; j++)
    covar[lista[j]][lista[j]] = covar[1][j];
  for (j = 2; j <= ma; j++)
    for (i = 1; i <= j - 1; i++)
      covar[i][j] = covar[j][i];
}
```