user: Demonstrate the C code that generates the assembly output below:

```asm
<dftcxb>:
  endbr64
  push   %r15
  push   %r14
  mov    %edx,%r14d
  mov    %ecx,%edx
  push   %r13
  mov    %r8,%r13
  push   %r12
  mov    %r9,%r12
  push   %rbp
  mov    %rsi,%rbp
  push   %rbx
  mov    %rdi,%rbx
  sub    $0x18,%rsp
  mov    %ecx,0xc(%rsp)
  cmp    %r14d,%ecx
  jg     L245
L197:
  mov    %edx,%ecx
  mov    %r13,%r8
  mov    $0x1,%esi
  mov    %rbx,%rdi
  shr    $0x1f,%ecx
  add    %edx,%ecx
  sar    %ecx
  neg    %ecx
  call   <left_rotate@plt>
  mov    0xc(%rsp),%edx
  mov    %r12,%r8
  mov    %rbp,%rdi
  mov    $0x1,%esi
  mov    %edx,%ecx
  shr    $0x1f,%ecx
  add    %edx,%ecx
  sar    %ecx
  neg    %ecx
  call   <left_rotate@plt>
  mov    0xc(%rsp),%esi
  test   %esi,%esi
  jle    L151
  lea    -0x1(%rsi),%eax
  cmp    $0x2,%eax
  jbe    L166
  mov    %esi,%edx
  movaps D1(%rip),%xmm1
  mov    %rbp,%rax
  shr    $0x2,%edx
  lea    -0x1(%rdx),%ecx
  shl    $0x4,%rcx
  add    %rbp,%rcx
  nopl   0x0(%rax,%rax,1)
L132:
  movups (%rax),%xmm0
  mov    %rax,%rdx
  add    $0x10,%rax
  xorps  %xmm1,%xmm0
  movups %xmm0,-0x10(%rax)
  cmp    %rcx,%rdx
  jne    L132
  mov    %esi,%eax
  and    $0xfffffffc,%eax
  test   $0x3,%sil
  je     L151
L212:
  movslq %eax,%rdx
  movss  D7(%rip),%xmm1
  shl    $0x2,%rdx
  lea    0x0(%rbp,%rdx,1),%rcx
  movss  (%rcx),%xmm0
  xorps  %xmm1,%xmm0
  movss  %xmm0,(%rcx)
  lea    0x1(%rax),%ecx
  cmp    %esi,%ecx
  jge    L151
  lea    0x4(%rbp,%rdx,1),%rcx
  add    $0x2,%eax
  movss  (%rcx),%xmm0
  xorps  %xmm1,%xmm0
  movss  %xmm0,(%rcx)
  cmp    %eax,%esi
  jle    L151
  lea    0x8(%rbp,%rdx,1),%rax
  movss  (%rax),%xmm0
  xorps  %xmm1,%xmm0
  movss  %xmm0,(%rax)
L151:
  lea    0xc(%rsp),%rdx
  push   %r12
  xor    %r8d,%r8d
  mov    $0x1,%r9d
  push   %r13
  mov    $0x1,%ecx
  mov    %rbp,%rsi
  mov    %rbx,%rdi
  call   <fourt@plt>
  mov    0x1c(%rsp),%r8d
  pop    %rax
  pop    %rdx
  test   %r8d,%r8d
  jle    L104
  lea    -0x1(%r8),%edi
  mov    %r8d,%esi
  cmp    $0x2,%edi
  jbe    L97
  mov    %r8d,%edx
  movaps D1(%rip),%xmm1
  mov    %rbp,%rax
  shr    $0x2,%edx
  lea    -0x1(%rdx),%ecx
  shl    $0x4,%rcx
  add    %rbp,%rcx
  nopw   0x0(%rax,%rax,1)
L0:
  movups (%rax),%xmm0
  mov    %rax,%rdx
  add    $0x10,%rax
  xorps  %xmm1,%xmm0
  movups %xmm0,-0x10(%rax)
  cmp    %rcx,%rdx
  jne    L0
  mov    %r8d,%eax
  and    $0xfffffffc,%eax
  cmp    %eax,%r8d
  je     L158
L106:
  movslq %eax,%rdx
  movss  D7(%rip),%xmm1
  shl    $0x2,%rdx
  lea    0x0(%rbp,%rdx,1),%rcx
  movss  (%rcx),%xmm0
  xorps  %xmm1,%xmm0
  movss  %xmm0,(%rcx)
  lea    0x1(%rax),%ecx
  cmp    %ecx,%r8d
  jle    L11
  lea    0x4(%rbp,%rdx,1),%rcx
  add    $0x2,%eax
  movss  (%rcx),%xmm0
  xorps  %xmm1,%xmm0
  movss  %xmm0,(%rcx)
  cmp    %r8d,%eax
  jge    L11
  lea    0x8(%rbp,%rdx,1),%rax
  movss  (%rax),%xmm0
  xorps  %xmm1,%xmm0
  movss  %xmm0,(%rax)
L11:
  pxor   %xmm1,%xmm1
  movsd  D17(%rip),%xmm0
  lea    0xf(%rbx),%rax
  cvtsi2sd %r8d,%xmm1
  sub    %rbp,%rax
  divsd  %xmm1,%xmm0
  cvtsd2ss %xmm0,%xmm0
  cmp    $0x1e,%rax
  jbe    L89
  cmp    $0x1,%r8d
  je     L89
  cmp    $0x2,%edi
  jbe    L228
L126:
  mov    %r8d,%edx
  movaps %xmm0,%xmm2
  xor    %eax,%eax
  shr    $0x2,%edx
  shufps $0x0,%xmm2,%xmm2
  shl    $0x4,%rdx
  nopl   0x0(%rax)
L31:
  movups (%rbx,%rax,1),%xmm1
  mulps  %xmm2,%xmm1
  movups %xmm1,(%rbx,%rax,1)
  movups 0x0(%rbp,%rax,1),%xmm1
  mulps  %xmm2,%xmm1
  movups %xmm1,0x0(%rbp,%rax,1)
  add    $0x10,%rax
  cmp    %rdx,%rax
  jne    L31
  mov    %r8d,%edx
  and    $0xfffffffc,%edx
  mov    %edx,%eax
  cmp    %r8d,%edx
  je     L104
  mov    %r8d,%esi
  sub    %edx,%esi
  cmp    $0x1,%esi
  je     L2
L193:
  shl    $0x2,%rdx
  movaps %xmm0,%xmm1
  lea    (%rbx,%rdx,1),%rcx
  shufps $0xe0,%xmm1,%xmm1
  add    %rbp,%rdx
  movq   (%rcx),%xmm2
  mulps  %xmm1,%xmm2
  movlps %xmm2,(%rcx)
  movq   (%rdx),%xmm2
  mulps  %xmm1,%xmm2
  movlps %xmm2,(%rdx)
  mov    %esi,%edx
  and    $0xfffffffe,%edx
  add    %edx,%eax
  cmp    %edx,%esi
  je     L104
L2:
  cltq
  shl    $0x2,%rax
  add    %rax,%rbx
  add    %rbp,%rax
  movss  (%rbx),%xmm1
  mulss  %xmm0,%xmm1
  movss  %xmm1,(%rbx)
  mulss  (%rax),%xmm0
  movss  %xmm0,(%rax)
L104:
  add    $0x18,%rsp
  mov    %r8d,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax,%rax,1)
L245:
  movslq %r14d,%r15
  sub    %r14d,%edx
  xor    %esi,%esi
  shl    $0x2,%r15
  shl    $0x2,%edx
  lea    (%rdi,%r15,1),%rdi
  call   <memset@plt>
  mov    0xc(%rsp),%edx
  lea    0x0(%rbp,%r15,1),%rdi
  xor    %esi,%esi
  sub    %r14d,%edx
  shl    $0x2,%edx
  call   <memset@plt>
  mov    0xc(%rsp),%edx
  jmp    L197
  nop
L158:
  pxor   %xmm1,%xmm1
  movsd  D17(%rip),%xmm0
  lea    0xf(%rbx),%rax
  cvtsi2sd %r8d,%xmm1
  sub    %rbp,%rax
  divsd  %xmm1,%xmm0
  cvtsd2ss %xmm0,%xmm0
  cmp    $0x1e,%rax
  ja     L126
L89:
  mov    %r8d,%edx
  xor    %eax,%eax
  nop
L115:
  movss  (%rbx,%rax,4),%xmm1
  mulss  %xmm0,%xmm1
  movss  %xmm1,(%rbx,%rax,4)
  movss  0x0(%rbp,%rax,4),%xmm1
  mulss  %xmm0,%xmm1
  movss  %xmm1,0x0(%rbp,%rax,4)
  add    $0x1,%rax
  cmp    %rdx,%rax
  jne    L115
  jmp    L104
L228:
  xor    %edx,%edx
  xor    %eax,%eax
  jmp    L193
L166:
  xor    %eax,%eax
  jmp    L212
L97:
  xor    %eax,%eax
  jmp    L106
```

tool_calls: name: read_data
arguments: data_label: D1
data_type: byte[16]
name: read_data
arguments: data_label: D7
data_type: byte[4]
name: read_data
arguments: data_label: D17
data_type: f64

tool: {"D1": [0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x80]}

tool: {"D7": [0x00,0x00,0x00,0x80]}

tool: D17: 1

assistant: ```c
int dftcxb(float *xrr, float *xri, int isize, int ntot, float *workr, float *worki) {
  int i, idum;
  float scale;
  if (ntot > isize) {
    memset(xrr + isize, 0, sizeof(float) * (ntot - isize));
    memset(xri + isize, 0, sizeof(float) * (ntot - isize));
  }
  left_rotate(xrr, 1, ntot, -ntot / 2, workr);
  left_rotate(xri, 1, ntot, -ntot / 2, worki);
  for (i = 0; i < ntot; i++)
    xri[i] *= -1;
  fourt(xrr, xri, &ntot, 1, 0, 1, workr, worki);
  for (i = 0; i < ntot; i++)
    xri[i] *= -1;
  scale = 1.0 / ntot;
  for (i = 0; i < ntot; i++) {
    xrr[i] *= scale;
    xri[i] *= scale;
  }
  return ntot;
}
```