user: What is the c source code of the assembly code below:

```asm
<cswapc2n>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x28(%rbp)
  mov    %rsi,-0x30(%rbp)
  mov    %edx,-0x34(%rbp)
  mov    %ecx,-0x38(%rbp)
  mov    %r8d,-0x3c(%rbp)
  mov    %r9d,-0x40(%rbp)
  cmpl   $0x0,-0x34(%rbp)
  jns    L33
  mov    -0x3c(%rbp),%eax
  sub    $0x1,%eax
  mov    %eax,-0xc(%rbp)
  jmp    L89
L202:
  mov    0x20(%rbp),%eax
  imul   0x10(%rbp),%eax
  imul   -0xc(%rbp),%eax
  add    %eax,%eax
  mov    %eax,-0x8(%rbp)
  movl   $0x0,-0x10(%rbp)
  jmp    L168
L150:
  mov    0x20(%rbp),%eax
  imul   -0x10(%rbp),%eax
  add    %eax,%eax
  mov    %eax,-0x4(%rbp)
  movl   $0x0,-0x14(%rbp)
  jmp    L175
L98:
  mov    -0x10(%rbp),%eax
  imul   0x20(%rbp),%eax
  lea    (%rax,%rax,1),%edx
  mov    -0x14(%rbp),%eax
  add    %eax,%edx
  mov    -0x8(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x28(%rbp),%rax
  add    %rax,%rdx
  mov    -0x14(%rbp),%eax
  lea    (%rax,%rax,1),%ecx
  mov    -0x4(%rbp),%eax
  add    %ecx,%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x30(%rbp),%rax
  add    %rcx,%rax
  movss  (%rdx),%xmm0
  movss  %xmm0,(%rax)
  mov    -0x10(%rbp),%eax
  add    %eax,%eax
  add    $0x1,%eax
  imul   0x20(%rbp),%eax
  mov    %eax,%edx
  mov    -0x14(%rbp),%eax
  add    %eax,%edx
  mov    -0x8(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x28(%rbp),%rax
  add    %rax,%rdx
  mov    -0x14(%rbp),%eax
  lea    (%rax,%rax,1),%ecx
  mov    -0x4(%rbp),%eax
  add    %ecx,%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,4),%rcx
  mov    -0x30(%rbp),%rax
  add    %rcx,%rax
  movss  (%rdx),%xmm0
  movss  %xmm0,(%rax)
  addl   $0x1,-0x14(%rbp)
L175:
  mov    -0x14(%rbp),%eax
  cmp    0x20(%rbp),%eax
  jl     L98
  addl   $0x1,-0x10(%rbp)
L168:
  mov    -0x10(%rbp),%eax
  cmp    -0x38(%rbp),%eax
  jl     L150
  movl   $0x0,-0x10(%rbp)
  jmp    L6
L219:
  mov    0x20(%rbp),%eax
  imul   -0x10(%rbp),%eax
  add    %eax,%eax
  mov    %eax,-0x4(%rbp)
  movl   $0x0,-0x14(%rbp)
  jmp    L161
L11:
  mov    -0x14(%rbp),%edx
  mov    -0x4(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x30(%rbp),%rax
  add    %rax,%rdx
  mov    -0x10(%rbp),%eax
  imul   0x20(%rbp),%eax
  lea    (%rax,%rax,1),%ecx
  mov    -0x14(%rbp),%eax
  add    %eax,%ecx
  mov    -0x8(%rbp),%eax
  add    %ecx,%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x28(%rbp),%rax
  add    %rcx,%rax
  movss  (%rdx),%xmm0
  movss  %xmm0,(%rax)
  addl   $0x1,-0x14(%rbp)
L161:
  mov    -0x14(%rbp),%eax
  cmp    0x20(%rbp),%eax
  jl     L11
  mov    0x20(%rbp),%eax
  add    %eax,-0x4(%rbp)
  movl   $0x0,-0x14(%rbp)
  jmp    L154
L253:
  mov    -0x14(%rbp),%edx
  mov    -0x4(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x30(%rbp),%rax
  add    %rax,%rdx
  mov    -0x10(%rbp),%eax
  add    %eax,%eax
  add    $0x1,%eax
  imul   0x20(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x14(%rbp),%eax
  add    %eax,%ecx
  mov    -0x8(%rbp),%eax
  add    %ecx,%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x28(%rbp),%rax
  add    %rcx,%rax
  movss  (%rdx),%xmm0
  movss  %xmm0,(%rax)
  addl   $0x1,-0x14(%rbp)
L154:
  mov    -0x14(%rbp),%eax
  cmp    0x20(%rbp),%eax
  jl     L253
  addl   $0x1,-0x10(%rbp)
L6:
  mov    -0x10(%rbp),%eax
  cmp    -0x38(%rbp),%eax
  jl     L219
  addl   $0x1,-0xc(%rbp)
L89:
  mov    -0xc(%rbp),%eax
  cmp    -0x40(%rbp),%eax
  jl     L202
  jmp    L57
L33:
  cmpl   $0x0,-0x34(%rbp)
  jle    L57
  mov    -0x3c(%rbp),%eax
  sub    $0x1,%eax
  mov    %eax,-0xc(%rbp)
  jmp    L176
L72:
  mov    0x20(%rbp),%eax
  imul   0x10(%rbp),%eax
  imul   -0xc(%rbp),%eax
  add    %eax,%eax
  mov    %eax,-0x8(%rbp)
  movl   $0x0,-0x10(%rbp)
  jmp    L87
L78:
  mov    0x20(%rbp),%eax
  imul   -0x10(%rbp),%eax
  add    %eax,%eax
  mov    %eax,-0x4(%rbp)
  movl   $0x0,-0x14(%rbp)
  jmp    L31
L43:
  mov    -0x10(%rbp),%eax
  imul   0x20(%rbp),%eax
  lea    (%rax,%rax,1),%edx
  mov    -0x14(%rbp),%eax
  add    %eax,%edx
  mov    -0x8(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x28(%rbp),%rax
  add    %rax,%rdx
  mov    -0x14(%rbp),%ecx
  mov    -0x4(%rbp),%eax
  add    %ecx,%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x30(%rbp),%rax
  add    %rcx,%rax
  movss  (%rdx),%xmm0
  movss  %xmm0,(%rax)
  addl   $0x1,-0x14(%rbp)
L31:
  mov    -0x14(%rbp),%eax
  cmp    0x20(%rbp),%eax
  jl     L43
  mov    0x20(%rbp),%eax
  add    %eax,-0x4(%rbp)
  movl   $0x0,-0x14(%rbp)
  jmp    L42
L128:
  mov    -0x10(%rbp),%eax
  add    %eax,%eax
  add    $0x1,%eax
  imul   0x20(%rbp),%eax
  mov    %eax,%edx
  mov    -0x14(%rbp),%eax
  add    %eax,%edx
  mov    -0x8(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x28(%rbp),%rax
  add    %rax,%rdx
  mov    -0x14(%rbp),%ecx
  mov    -0x4(%rbp),%eax
  add    %ecx,%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x30(%rbp),%rax
  add    %rcx,%rax
  movss  (%rdx),%xmm0
  movss  %xmm0,(%rax)
  addl   $0x1,-0x14(%rbp)
L42:
  mov    -0x14(%rbp),%eax
  cmp    0x20(%rbp),%eax
  jl     L128
  addl   $0x1,-0x10(%rbp)
L87:
  mov    -0x10(%rbp),%eax
  cmp    -0x38(%rbp),%eax
  jl     L78
  movl   $0x0,-0x10(%rbp)
  jmp    L66
L184:
  mov    0x20(%rbp),%eax
  imul   -0x10(%rbp),%eax
  add    %eax,%eax
  mov    %eax,-0x4(%rbp)
  movl   $0x0,-0x14(%rbp)
  jmp    L174
L269:
  mov    -0x14(%rbp),%eax
  lea    (%rax,%rax,1),%edx
  mov    -0x4(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x30(%rbp),%rax
  add    %rax,%rdx
  mov    -0x10(%rbp),%eax
  imul   0x20(%rbp),%eax
  lea    (%rax,%rax,1),%ecx
  mov    -0x14(%rbp),%eax
  add    %eax,%ecx
  mov    -0x8(%rbp),%eax
  add    %ecx,%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x28(%rbp),%rax
  add    %rcx,%rax
  movss  (%rdx),%xmm0
  movss  %xmm0,(%rax)
  mov    -0x14(%rbp),%eax
  lea    (%rax,%rax,1),%edx
  mov    -0x4(%rbp),%eax
  add    %edx,%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x30(%rbp),%rax
  add    %rax,%rdx
  mov    -0x10(%rbp),%eax
  add    %eax,%eax
  add    $0x1,%eax
  imul   0x20(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x14(%rbp),%eax
  add    %eax,%ecx
  mov    -0x8(%rbp),%eax
  add    %ecx,%eax
  cltq
  lea    0x0(,%rax,4),%rcx
  mov    -0x28(%rbp),%rax
  add    %rcx,%rax
  movss  (%rdx),%xmm0
  movss  %xmm0,(%rax)
  addl   $0x1,-0x14(%rbp)
L174:
  mov    -0x14(%rbp),%eax
  cmp    0x20(%rbp),%eax
  jl     L269
  addl   $0x1,-0x10(%rbp)
L66:
  mov    -0x10(%rbp),%eax
  cmp    -0x38(%rbp),%eax
  jl     L184
  addl   $0x1,-0xc(%rbp)
L176:
  mov    -0xc(%rbp),%eax
  cmp    -0x40(%rbp),%eax
  jl     L72
  nop
L57:
  nop
  pop    %rbp
  ret
```

assistant: ```c
void cswapc2n(float f[], float s[], int isign, int nxh, int nyi, int nyt, int nxhd, int nyd, int ndim) {
  int i, j, k, ioff, nk;
  if (isign < 0) {
    for (k = nyi - 1; k < nyt; k++) {
      nk = 2 * ndim * nxhd * k;
      for (j = 0; j < nxh; j++) {
        ioff = 2 * ndim * j;
        for (i = 0; i < ndim; i++) {
          s[2 * i + ioff] = f[i + ndim * (2 * j) + nk];
          s[2 * i + ioff + 1] = f[i + ndim * (2 * j + 1) + nk];
        }
      }
      for (j = 0; j < nxh; j++) {
        ioff = 2 * ndim * j;
        for (i = 0; i < ndim; i++) {
          f[i + ndim * (2 * j) + nk] = s[i + ioff];
        }
        ioff += ndim;
        for (i = 0; i < ndim; i++) {
          f[i + ndim * (2 * j + 1) + nk] = s[i + ioff];
        }
      }
    }
  } else if (isign > 0) {
    for (k = nyi - 1; k < nyt; k++) {
      nk = 2 * ndim * nxhd * k;
      for (j = 0; j < nxh; j++) {
        ioff = 2 * ndim * j;
        for (i = 0; i < ndim; i++) {
          s[i + ioff] = f[i + ndim * (2 * j) + nk];
        }
        ioff += ndim;
        for (i = 0; i < ndim; i++) {
          s[i + ioff] = f[i + ndim * (2 * j + 1) + nk];
        }
      }
      for (j = 0; j < nxh; j++) {
        ioff = 2 * ndim * j;
        for (i = 0; i < ndim; i++) {
          f[i + ndim * (2 * j) + nk] = s[2 * i + ioff];
          f[i + ndim * (2 * j + 1) + nk] = s[2 * i + ioff + 1];
        }
      }
    }
  }
  return;
}
```