user: 这段汇编代码用C语言表示是什么样的：

```asm
<iffts1>:
  endbr64
  push   %r15
  mov    $0x1,%eax
  mov    %edx,%r15d
  push   %r14
  mov    %r8,%r14
  push   %r13
  push   %r12
  mov    %rcx,%r12
  mov    %esi,%ecx
  push   %rbp
  shl    %cl,%rax
  mov    %esi,%ebp
  push   %rbx
  mov    %rdi,%rbx
  sub    $0x18,%rsp
  test   %rax,%rax
  js     L241
  pxor   %xmm1,%xmm1
  cvtsi2sd %rax,%xmm1
L117:
  movsd  D7(%rip),%xmm0
  pxor   %xmm2,%xmm2
  divsd  %xmm1,%xmm0
  cvtsd2ss %xmm0,%xmm2
  movss  %xmm2,0x4(%rsp)
  cmp    $0x2,%ebp
  je     L223
  jg     L33
  test   %ebp,%ebp
  je     L252
  cmp    $0x1,%ebp
  jne    L188
  movslq %r15d,%rbp
  shl    $0x4,%rbp
  add    %rbx,%rbp
  test   %r15d,%r15d
  jle    L252
  nopl   (%rax)
L79:
  movss  0x4(%rsp),%xmm0
  mov    %rbx,%rdi
  add    $0x10,%rbx
  call   <ifft2pt@plt>
  cmp    %rbp,%rbx
  jne    L79
L252:
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  cs nopw 0x0(%rax,%rax,1)
L33:
  cmp    $0x3,%ebp
  jne    L188
  movslq %r15d,%rbp
  shl    $0x6,%rbp
  add    %rbx,%rbp
  test   %r15d,%r15d
  jle    L252
  nopl   0x0(%rax)
L143:
  movss  0x4(%rsp),%xmm0
  mov    %rbx,%rdi
  add    $0x40,%rbx
  call   <ifft8pt@plt>
  cmp    %rbx,%rbp
  jne    L143
  jmp    L252
  nopl   0x0(%rax)
L241:
  mov    %rax,%rdx
  and    $0x1,%eax
  pxor   %xmm1,%xmm1
  shr    %rdx
  or     %rax,%rdx
  cvtsi2sd %rdx,%xmm1
  addsd  %xmm1,%xmm1
  jmp    L117
  cs nopw 0x0(%rax,%rax,1)
L188:
  test   %r15d,%r15d
  jle    L252
  lea    -0x1(%rbp),%edx
  movslq %edx,%r13
  mov    %edx,%eax
  imul   $0x55555556,%r13,%r13
  sar    $0x1f,%eax
  shr    $0x20,%r13
  sub    %eax,%r13d
  lea    0x0(,%r13,4),%ecx
  mov    %r13d,%eax
  sub    %ecx,%eax
  mov    %ebp,%ecx
  add    %edx,%eax
  mov    $0x8,%edx
  shl    %cl,%rdx
  mov    %rdx,0x8(%rsp)
  cmp    $0x1,%eax
  je     L144
  cmp    $0xb,%ebp
  jbe    L220
  cmp    $0x2,%eax
  je     L280
  nopw   0x0(%rax,%rax,1)
L211:
  movss  0x4(%rsp),%xmm0
  mov    %rbx,%rdi
  mov    %r14,%rdx
  mov    %ebp,%esi
  call   <scbitrevR2@plt>
  mov    %rbx,%rdi
  mov    %r13d,%r9d
  mov    $0x1,%ecx
  mov    $0x2,%r8d
  mov    %r12,%rdx
  mov    %ebp,%esi
  call   <ifftrecurs@plt>
  add    0x8(%rsp),%rbx
  sub    $0x1,%r15d
  jne    L211
  jmp    L252
  xchg   %ax,%ax
L223:
  movslq %r15d,%rbp
  shl    $0x5,%rbp
  add    %rbx,%rbp
  test   %r15d,%r15d
  jle    L252
  nopl   0x0(%rax,%rax,1)
L115:
  movss  0x4(%rsp),%xmm0
  mov    %rbx,%rdi
  add    $0x20,%rbx
  call   <ifft4pt@plt>
  cmp    %rbp,%rbx
  jne    L115
  jmp    L252
  nopl   0x0(%rax)
L280:
  movss  0x4(%rsp),%xmm0
  mov    %rbx,%rdi
  mov    %r14,%rdx
  mov    %ebp,%esi
  call   <scbitrevR2@plt>
  mov    %rbx,%rdi
  mov    $0x2,%edx
  mov    %ebp,%esi
  call   <ibfR4@plt>
  mov    %rbx,%rdi
  mov    %r13d,%r9d
  mov    $0x1,%ecx
  mov    $0x8,%r8d
  mov    %r12,%rdx
  mov    %ebp,%esi
  call   <ifftrecurs@plt>
  add    0x8(%rsp),%rbx
  sub    $0x1,%r15d
  jne    L280
  jmp    L252
  nopl   (%rax)
L220:
  cmp    $0x2,%eax
  je     L185
  nopl   (%rax)
L236:
  movss  0x4(%rsp),%xmm0
  mov    %rbx,%rdi
  mov    %r14,%rdx
  mov    %ebp,%esi
  call   <scbitrevR2@plt>
  mov    %rbx,%rdi
  mov    %r13d,%r9d
  mov    $0x1,%ecx
  mov    $0x2,%r8d
  mov    %r12,%rdx
  mov    %ebp,%esi
  call   <ibfstages@plt>
  add    0x8(%rsp),%rbx
  sub    $0x1,%r15d
  jne    L236
  jmp    L252
  xchg   %ax,%ax
L185:
  movss  0x4(%rsp),%xmm0
  mov    %rbx,%rdi
  mov    %r14,%rdx
  mov    %ebp,%esi
  call   <scbitrevR2@plt>
  mov    %rbx,%rdi
  mov    $0x2,%edx
  mov    %ebp,%esi
  call   <ibfR4@plt>
  mov    %rbx,%rdi
  mov    %r13d,%r9d
  mov    $0x1,%ecx
  mov    $0x8,%r8d
  mov    %r12,%rdx
  mov    %ebp,%esi
  call   <ibfstages@plt>
  add    0x8(%rsp),%rbx
  sub    $0x1,%r15d
  jne    L185
  jmp    L252
  nopl   (%rax)
L144:
  cmp    $0xb,%ebp
  jbe    L71
  nopl   (%rax)
L25:
  movss  0x4(%rsp),%xmm0
  mov    %rbx,%rdi
  mov    %r14,%rdx
  mov    %ebp,%esi
  call   <scbitrevR2@plt>
  mov    %rbx,%rdi
  mov    $0x2,%edx
  mov    %ebp,%esi
  call   <ibfR2@plt>
  mov    %rbx,%rdi
  mov    %r13d,%r9d
  mov    $0x1,%ecx
  mov    $0x4,%r8d
  mov    %r12,%rdx
  mov    %ebp,%esi
  call   <ifftrecurs@plt>
  add    0x8(%rsp),%rbx
  sub    $0x1,%r15d
  jne    L25
  jmp    L252
  nopl   (%rax)
L71:
  movss  0x4(%rsp),%xmm0
  mov    %rbx,%rdi
  mov    %r14,%rdx
  mov    %ebp,%esi
  call   <scbitrevR2@plt>
  mov    %rbx,%rdi
  mov    $0x2,%edx
  mov    %ebp,%esi
  call   <ibfR2@plt>
  mov    %rbx,%rdi
  mov    %r13d,%r9d
  mov    $0x1,%ecx
  mov    $0x4,%r8d
  mov    %r12,%rdx
  mov    %ebp,%esi
  call   <ibfstages@plt>
  add    0x8(%rsp),%rbx
  sub    $0x1,%r15d
  jne    L71
  jmp    L252
```

tool_calls: name: disassemble_data
arguments: data_label: D7
datatype: f64

tool: D7: 1

assistant: ```c
void iffts1(float *ioptr, int M, int Rows, float *Utbl, short *BRLow) {
  int StageCnt;
  int NDiffU;
  const float scale = 1.0 / ((unsigned long)1 << (M));
  switch (M) {
  case 0:
    break;
  case 1:
    for (; Rows > 0; Rows--) {
      ifft2pt(ioptr, scale);
      ioptr += 2 * ((unsigned long)1 << (M));
    }
    break;
  case 2:
    for (; Rows > 0; Rows--) {
      ifft4pt(ioptr, scale);
      ioptr += 2 * ((unsigned long)1 << (M));
    }
    break;
  case 3:
    for (; Rows > 0; Rows--) {
      ifft8pt(ioptr, scale);
      ioptr += 2 * ((unsigned long)1 << (M));
    }
    break;
  default:
    for (; Rows > 0; Rows--) {
      scbitrevR2(ioptr, M, BRLow, scale);
      StageCnt = (M - 1) / 3;
      NDiffU = 2;
      if ((M - 1 - (StageCnt * 3)) == 1) {
        ibfR2(ioptr, M, NDiffU);
        NDiffU *= 2;
      }
      if ((M - 1 - (StageCnt * 3)) == 2) {
        ibfR4(ioptr, M, NDiffU);
        NDiffU *= 4;
      }
      if (M <= (11 - (sizeof(float) / 8)))
        ibfstages(ioptr, M, Utbl, 1, NDiffU, StageCnt);
      else {
        ifftrecurs(ioptr, M, Utbl, 1, NDiffU, StageCnt);
      }
      ioptr += 2 * ((unsigned long)1 << (M));
    }
  }
}
```