user: 请显示与下面列出的汇编代码相匹配的C语言实现：

```asm
<passf2>:
  endbr64
  push   %r15
  mov    %edi,%r11d
  mov    %rdx,%r10
  mov    %rcx,%rax
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %esi,%ebx
  cmp    $0x2,%edi
  jle    L35
  test   %esi,%esi
  jle    L28
  lea    (%r11,%r11,1),%r13d
  movslq %r11d,%r12
  sub    $0x2,%r11d
  xor    %ebp,%ebp
  shr    %r11d
  imul   %esi,%edi
  pxor   %xmm3,%xmm3
  shl    $0x3,%r12
  mov    %r11d,%eax
  cvtsi2sd %r9d,%xmm3
  movslq %r13d,%r13
  mov    %rcx,%r9
  add    %rax,%rax
  lea    (%rdx,%r12,1),%r15
  lea    0x10(%rdx),%r14
  xor    %r11d,%r11d
  mov    %rax,-0x10(%rsp)
  lea    0x8(%r8),%rax
  movslq %edi,%rdi
  mov    %rax,-0x8(%rsp)
  nopw   0x0(%rax,%rax,1)
L54:
  mov    -0x10(%rsp),%rcx
  lea    0x0(,%r11,8),%rdx
  mov    -0x8(%rsp),%rsi
  lea    (%r10,%rdx,1),%rax
  add    %r15,%rdx
  add    %r11,%rcx
  lea    (%r14,%rcx,8),%r8
  mov    %r9,%rcx
  nopl   0x0(%rax,%rax,1)
L8:
  movsd  (%rax),%xmm0
  addsd  (%rdx),%xmm0
  add    $0x10,%rax
  add    $0x10,%rdx
  add    $0x10,%rsi
  movsd  %xmm0,(%rcx)
  movsd  -0x8(%rax),%xmm1
  addsd  -0x8(%rdx),%xmm1
  movsd  -0x10(%rax),%xmm0
  subsd  -0x10(%rdx),%xmm0
  movsd  %xmm1,0x8(%rcx)
  movsd  -0x10(%rsi),%xmm1
  movsd  -0x8(%rax),%xmm2
  subsd  -0x8(%rdx),%xmm2
  movsd  -0x18(%rsi),%xmm4
  mulsd  %xmm3,%xmm1
  mulsd  %xmm2,%xmm4
  mulsd  %xmm0,%xmm1
  addsd  %xmm4,%xmm1
  movsd  %xmm1,0x8(%rcx,%rdi,8)
  movsd  -0x10(%rsi),%xmm1
  mulsd  -0x18(%rsi),%xmm0
  mulsd  %xmm3,%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  movsd  %xmm0,(%rcx,%rdi,8)
  add    $0x10,%rcx
  cmp    %rax,%r8
  jne    L8
  add    $0x1,%ebp
  add    %r13,%r11
  add    %r12,%r9
  cmp    %ebp,%ebx
  jne    L54
L28:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax,%rax,1)
L35:
  test   %esi,%esi
  jle    L28
  imul   %esi,%edi
  movslq %r11d,%rcx
  lea    (%r11,%r11,1),%esi
  mov    %rax,%r9
  movslq %esi,%rsi
  shl    $0x3,%rcx
  xor    %eax,%eax
  shl    $0x3,%rsi
  lea    (%rdx,%rcx,1),%rdx
  movslq %edi,%rdi
  nopl   (%rax)
L36:
  movsd  (%r10),%xmm0
  addsd  (%rdx),%xmm0
  add    $0x1,%eax
  movsd  %xmm0,(%r9)
  movsd  (%r10),%xmm0
  subsd  (%rdx),%xmm0
  movsd  %xmm0,(%r9,%rdi,8)
  movsd  0x8(%r10),%xmm0
  addsd  0x8(%rdx),%xmm0
  movsd  %xmm0,0x8(%r9)
  movsd  0x8(%r10),%xmm0
  add    %rsi,%r10
  subsd  0x8(%rdx),%xmm0
  add    %rsi,%rdx
  movsd  %xmm0,0x8(%r9,%rdi,8)
  add    %rcx,%r9
  cmp    %eax,%ebx
  jne    L36
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void passf2(int ido, int l1, const double cc[], double ch[], const double wa1[], int isign) {
  int i, k, ah, ac;
  double ti2, tr2;
  if (ido <= 2) {
    for (k = 0; k < l1; k++) {
      ah = k * ido;
      ac = 2 * k * ido;
      ch[ah] = cc[ac] + cc[ac + ido];
      ch[ah + ido * l1] = cc[ac] - cc[ac + ido];
      ch[ah + 1] = cc[ac + 1] + cc[ac + ido + 1];
      ch[ah + ido * l1 + 1] = cc[ac + 1] - cc[ac + ido + 1];
    }
  } else {
    for (k = 0; k < l1; k++) {
      for (i = 0; i < ido - 1; i += 2) {
        ah = i + k * ido;
        ac = i + 2 * k * ido;
        ch[ah] = cc[ac] + cc[ac + ido];
        tr2 = cc[ac] - cc[ac + ido];
        ch[ah + 1] = cc[ac + 1] + cc[ac + 1 + ido];
        ti2 = cc[ac + 1] - cc[ac + 1 + ido];
        ch[ah + l1 * ido + 1] = wa1[i] * ti2 + isign * wa1[i + 1] * tr2;
        ch[ah + l1 * ido] = wa1[i] * tr2 - isign * wa1[i + 1] * ti2;
      }
    }
  }
}
```