user: 请将这段汇编代码片段转换成等效的C代码:

```asm
<one_step_heun>:
  endbr64
  push   %r14
  push   %r13
  mov    %rsi,%r13
  push   %r12
  movslq %edx,%r12
  push   %rbp
  mov    %rcx,%rbp
  push   %rbx
  mov    %rdi,%rbx
  sub    $0x10,%rsp
  movsd  (%rcx),%xmm1
  movsd  %xmm0,0x8(%rsp)
  movsd  %xmm1,(%rsp)
  call   <set_wieners@plt>
  movsd  (%rsp),%xmm1
  mov    %r12d,%edx
  mov    %rbx,%rdi
  mov    0x0(%r13),%rsi
  movapd %xmm1,%xmm0
  call   <my_rhs@plt>
  test   %r12d,%r12d
  movsd  (%rsp),%xmm1
  movsd  0x8(%rsp),%xmm2
  jle    L130
  mov    0x0(%r13),%rdi
  cmp    $0x1,%r12d
  lea    0x8(%rbx),%rax
  setne  %r14b
  cmp    %rax,%rdi
  je     L117
  test   %r14b,%r14b
  je     L117
  mov    %r12d,%edx
  movapd %xmm2,%xmm3
  xor    %eax,%eax
  shr    %edx
  unpcklpd %xmm3,%xmm3
  shl    $0x4,%rdx
  nopl   0x0(%rax)
L58:
  movupd (%rdi,%rax,1),%xmm0
  movupd (%rbx,%rax,1),%xmm6
  mulpd  %xmm3,%xmm0
  addpd  %xmm6,%xmm0
  movups %xmm0,(%rdi,%rax,1)
  add    $0x10,%rax
  cmp    %rdx,%rax
  jne    L58
  mov    %r12d,%eax
  and    $0xfffffffe,%eax
  test   $0x1,%r12b
  je     L39
  lea    (%rdi,%rax,8),%rdx
  movsd  (%rdx),%xmm0
  mulsd  %xmm2,%xmm0
  addsd  (%rbx,%rax,8),%xmm0
  movsd  %xmm0,(%rdx)
L39:
  addsd  %xmm2,%xmm1
  mov    0x8(%r13),%rsi
  mov    %r12d,%edx
  movsd  %xmm2,0x8(%rsp)
  movapd %xmm1,%xmm0
  movsd  %xmm1,(%rsp)
  call   <my_rhs@plt>
  mov    0x8(%r13),%rsi
  mov    0x0(%r13),%rcx
  movsd  (%rsp),%xmm1
  movsd  0x8(%rsp),%xmm2
  lea    0x8(%rsi),%rax
  cmp    %rax,%rbx
  lea    0x8(%rcx),%rax
  setne  %dl
  cmp    %rax,%rbx
  setne  %al
  test   %al,%dl
  je     L34
  test   %r14b,%r14b
  je     L34
  mov    %r12d,%edx
  movapd %xmm2,%xmm5
  movapd D29(%rip),%xmm4
  xor    %eax,%eax
  shr    %edx
  unpcklpd %xmm5,%xmm5
  shl    $0x4,%rdx
  nopw   0x0(%rax,%rax,1)
L42:
  movupd (%rsi,%rax,1),%xmm3
  movupd (%rbx,%rax,1),%xmm0
  movupd (%rcx,%rax,1),%xmm7
  mulpd  %xmm5,%xmm3
  addpd  %xmm7,%xmm0
  addpd  %xmm3,%xmm0
  mulpd  %xmm4,%xmm0
  movups %xmm0,(%rbx,%rax,1)
  add    $0x10,%rax
  cmp    %rdx,%rax
  jne    L42
  mov    %r12d,%eax
  and    $0xfffffffe,%eax
  and    $0x1,%r12d
  je     L132
  mulsd  (%rsi,%rax,8),%xmm2
  lea    (%rbx,%rax,8),%rdx
  movsd  (%rcx,%rax,8),%xmm0
  addsd  (%rdx),%xmm0
  addsd  %xmm2,%xmm0
  mulsd  D29(%rip),%xmm0
  movsd  %xmm0,(%rdx)
L132:
  movsd  %xmm1,0x0(%rbp)
  add    $0x10,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  ret
  nopl   0x0(%rax)
L117:
  movslq %r12d,%rdx
  xor    %eax,%eax
  nopl   (%rax)
L137:
  movsd  (%rdi,%rax,8),%xmm0
  mulsd  %xmm2,%xmm0
  addsd  (%rbx,%rax,8),%xmm0
  movsd  %xmm0,(%rdi,%rax,8)
  add    $0x1,%rax
  cmp    %rax,%rdx
  jne    L137
  jmp    L39
  nopl   0x0(%rax)
L34:
  movsd  D29(%rip),%xmm4
  xor    %eax,%eax
  nopw   0x0(%rax,%rax,1)
L62:
  movsd  (%rsi,%rax,8),%xmm3
  movsd  (%rcx,%rax,8),%xmm0
  addsd  (%rbx,%rax,8),%xmm0
  mulsd  %xmm2,%xmm3
  addsd  %xmm3,%xmm0
  mulsd  %xmm4,%xmm0
  movsd  %xmm0,(%rbx,%rax,8)
  add    $0x1,%rax
  cmp    %rax,%r12
  jne    L62
  jmp    L132
  xchg   %ax,%ax
L130:
  addsd  %xmm2,%xmm1
  mov    0x8(%r13),%rsi
  mov    0x0(%r13),%rdi
  mov    %r12d,%edx
  movapd %xmm1,%xmm0
  movsd  %xmm1,(%rsp)
  call   <my_rhs@plt>
  movsd  (%rsp),%xmm1
  jmp    L132
```

tool_calls: name: read_data
arguments: data_label: D29
type: byte[16]

tool: {"D29": [0x00,0x00,0x00,0x00,0x00,0x00,0xe0,0x3f,0x00,0x00,0x00,0x00,0x00,0x00,0xe0,0x3f]}

assistant: ```c
void one_step_heun(double *y, double dt, double *yval[2], int neq, double *tim) {
  int i;
  double t = *tim, t1;
  set_wieners(dt, y, *tim);
  my_rhs(t, y, yval[0], neq);
  for (i = 0; i < neq; i++)
    yval[0][i] = dt * yval[0][i] + y[i];
  t1 = t + dt;
  my_rhs(t1, yval[0], yval[1], neq);
  for (i = 0; i < neq; i++)
    y[i] = .5 * (y[i] + yval[0][i] + dt * yval[1][i]);
  *tim = t1;
}
```