user: 请将这段汇编代码片段转换成等效的C代码：

```asm
<covsrt>:
  endbr64
  push   %r15
  mov    %esi,%r9d
  push   %r14
  lea    -0x1(%rsi),%r14d
  push   %r13
  mov    %rdx,%r13
  push   %r12
  push   %rbp
  mov    %ecx,%ebp
  push   %rbx
  cmp    %esi,%ecx
  jge    L10
  test   %ecx,%ecx
  jle    L65
  lea    -0x1(%rsi),%r14d
L243:
  movslq %ecx,%rcx
  nopl   (%rax)
L190:
  mov    (%rdi,%rcx,8),%rsi
  lea    0x0(,%rcx,8),%r8
  xor    %eax,%eax
  xchg   %ax,%ax
L56:
  mov    (%rdi,%rax,8),%rdx
  movq   $0x0,(%rdx,%r8,1)
  movq   $0x0,(%rsi,%rax,8)
  add    $0x1,%rax
  cmp    %ecx,%eax
  jl     L56
  add    $0x1,%rcx
  cmp    %ecx,%r9d
  jg     L190
L10:
  sub    $0x1,%ebp
  test   %r14d,%r14d
  js     L1
  mov    %r14d,%eax
  movslq %r14d,%rsi
  mov    %rax,-0x10(%rsp)
  lea    0x8(%rdi,%rax,8),%rbx
  mov    %r9d,%eax
  shr    %eax
  lea    -0x1(%rax),%r12d
  mov    %r9d,%eax
  and    $0xfffffffe,%eax
  add    $0x1,%r12
  movslq %eax,%r8
  mov    %eax,-0x14(%rsp)
  shl    $0x4,%r12
  shl    $0x3,%r8
  jmp    L212
  nopl   (%rax)
L241:
  sub    $0x1,%rsi
  test   %esi,%esi
  js     L1
L212:
  mov    0x0(%r13,%rsi,4),%eax
  test   %eax,%eax
  je     L241
  test   %r9d,%r9d
  jle    L183
  movslq %ebp,%r15
  lea    0x0(,%rsi,8),%r10
  mov    %rdi,%rdx
  lea    0x0(,%r15,8),%r11
  nopl   0x0(%rax)
L120:
  mov    (%rdx),%rax
  add    $0x8,%rdx
  lea    (%rax,%r11,1),%rcx
  add    %r10,%rax
  movsd  (%rcx),%xmm0
  movsd  (%rax),%xmm1
  movsd  %xmm1,(%rcx)
  movsd  %xmm0,(%rax)
  cmp    %rbx,%rdx
  jne    L120
  mov    (%rdi,%r15,8),%rax
  mov    (%rdi,%rsi,8),%rcx
  lea    0xf(%rax),%rdx
  sub    %rcx,%rdx
  cmp    $0x1e,%rdx
  mov    $0x0,%edx
  jbe    L112
  cmp    $0x1,%r14d
  jbe    L112
  nopl   0x0(%rax,%rax,1)
L91:
  movupd (%rax,%rdx,1),%xmm0
  movupd (%rcx,%rdx,1),%xmm4
  movups %xmm4,(%rax,%rdx,1)
  movups %xmm0,(%rcx,%rdx,1)
  add    $0x10,%rdx
  cmp    %rdx,%r12
  jne    L91
  cmp    -0x14(%rsp),%r9d
  je     L183
  add    %r8,%rax
  lea    (%rcx,%r8,1),%rdx
  movsd  (%rax),%xmm0
  movsd  (%rdx),%xmm1
  movsd  %xmm1,(%rax)
  movsd  %xmm0,(%rdx)
L183:
  sub    $0x1,%rsi
  sub    $0x1,%ebp
  test   %esi,%esi
  jns    L212
L1:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax,%rax,1)
L65:
  lea    -0x1(%rsi),%r14d
  xor    %edx,%edx
  test   %r14d,%r14d
  cmovle %r14d,%edx
  mov    %edx,%eax
  sub    %ecx,%eax
  cmp    %edx,%ecx
  mov    $0x1,%ecx
  lea    0x1(%rax),%esi
  cmovg  %ecx,%esi
  jg     L146
  cmp    $0x2,%eax
  jbe    L146
  movd   %ebp,%xmm5
  mov    %esi,%ecx
  movdqa D23(%rip),%xmm3
  xor    %eax,%eax
  pshufd $0x0,%xmm5,%xmm1
  movdqa D13(%rip),%xmm2
  paddd  D24(%rip),%xmm1
  shr    $0x2,%ecx
  nopl   (%rax)
L36:
  movdqa %xmm1,%xmm0
  add    $0x1,%eax
  paddd  %xmm3,%xmm1
  paddd  %xmm2,%xmm0
  cmp    %eax,%ecx
  jne    L36
  mov    %esi,%r8d
  pshufd $0xff,%xmm0,%xmm0
  and    $0xfffffffc,%r8d
  movd   %xmm0,%ecx
  lea    (%r8,%rbp,1),%eax
  cmp    %r8d,%esi
  je     L39
L219:
  lea    0x1(%rax),%ecx
  cmp    %ecx,%edx
  jl     L39
  lea    0x2(%rax),%ecx
  add    $0x3,%eax
  cmp    %edx,%ecx
  cmovle %eax,%ecx
L39:
  cmp    %ecx,%r9d
  jg     L243
  jmp    L10
L112:
  mov    -0x10(%rsp),%r11
  nopl   0x0(%rax)
L108:
  movsd  (%rax,%rdx,8),%xmm0
  movsd  (%rcx,%rdx,8),%xmm1
  mov    %rdx,%r10
  movsd  %xmm1,(%rax,%rdx,8)
  movsd  %xmm0,(%rcx,%rdx,8)
  add    $0x1,%rdx
  cmp    %r10,%r11
  jne    L108
  jmp    L183
L146:
  mov    %ebp,%eax
  jmp    L219
```

tool_calls: name: read_data
arguments: tag: D23
type_infered: byte[16]
name: read_data
arguments: tag: D13
type_infered: byte[16]
name: read_data
arguments: tag: D24
type_infered: f32[4]

tool: {"D23": [0x04,0x00,0x00,0x00,0x04,0x00,0x00,0x00,0x04,0x00,0x00,0x00,0x04,0x00,0x00,0x00]}

tool: {"D13": [0x01,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x01,0x00,0x00,0x00]}

tool: {"D24": [0.0,1.401298464324817e-45,2.802596928649634e-45,4.203895392974451e-45]}

assistant: ```c
void covsrt(double **covar, int ma, int *ia, int mfit) {
  int i, j, k;
  double swap;
  for (i = mfit; i < ma; i++)
    for (j = 0; j < i; j++)
      covar[i][j] = covar[j][i] = 0.0;
  k = mfit - 1;
  for (j = ma - 1; j >= 0; j--) {
    if (ia[j]) {
      for (i = 0; i < ma; i++) {
        swap = (covar[i][k]);
        (covar[i][k]) = (covar[i][j]);
        (covar[i][j]) = swap;
      }
      for (i = 0; i < ma; i++) {
        swap = (covar[k][i]);
        (covar[k][i]) = (covar[j][i]);
        (covar[j][i]) = swap;
      }
      k--;
    }
  }
}
```