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

```asm
<rsqrt>:
  endbr64
  push   %rbx
  movapd %xmm0,%xmm1
  movq   %xmm0,%rbx
  lea    D85(%rip),%rdi
  sub    $0x10,%rsp
  movsd  D45(%rip),%xmm2
  mulsd  %xmm0,%xmm2
  movsd  %xmm2,(%rsp)
  call   <printf@plt>
  mov    %ebx,%edx
  mov    $0xc7aa19f9,%eax
  lea    D50(%rip),%rdi
  sar    %edx
  sub    %edx,%eax
  movabs $0xffffffff00000000,%rdx
  and    %rdx,%rbx
  or     %rax,%rbx
  movq   %rbx,%xmm1
  movq   %rbx,%xmm0
  mov    %rbx,0x8(%rsp)
  call   <printf@plt>
  movsd  0x8(%rsp),%xmm1
  movsd  (%rsp),%xmm2
  lea    D62(%rip),%rdi
  movsd  D61(%rip),%xmm0
  mulsd  %xmm1,%xmm2
  mulsd  %xmm1,%xmm2
  subsd  %xmm2,%xmm0
  mulsd  %xmm1,%xmm0
  movapd %xmm0,%xmm1
  movsd  %xmm0,0x8(%rsp)
  call   <printf@plt>
  movsd  0x8(%rsp),%xmm0
  movsd  (%rsp),%xmm2
  lea    D89(%rip),%rdi
  movsd  D61(%rip),%xmm1
  mulsd  %xmm0,%xmm2
  mulsd  %xmm0,%xmm2
  subsd  %xmm2,%xmm1
  mulsd  %xmm0,%xmm1
  movapd %xmm1,%xmm0
  movsd  %xmm1,0x8(%rsp)
  call   <printf@plt>
  movsd  0x8(%rsp),%xmm1
  movsd  (%rsp),%xmm2
  lea    D74(%rip),%rdi
  movsd  D61(%rip),%xmm0
  mulsd  %xmm1,%xmm2
  mulsd  %xmm1,%xmm2
  subsd  %xmm2,%xmm0
  mulsd  %xmm1,%xmm0
  movapd %xmm0,%xmm1
  movsd  %xmm0,0x8(%rsp)
  call   <printf@plt>
  movsd  0x8(%rsp),%xmm0
  movsd  (%rsp),%xmm2
  lea    D95(%rip),%rdi
  movsd  D61(%rip),%xmm1
  mulsd  %xmm0,%xmm2
  mulsd  %xmm0,%xmm2
  subsd  %xmm2,%xmm1
  mulsd  %xmm0,%xmm1
  movapd %xmm1,%xmm0
  movsd  %xmm1,0x8(%rsp)
  call   <printf@plt>
  movsd  0x8(%rsp),%xmm1
  movsd  (%rsp),%xmm2
  lea    D55(%rip),%rdi
  movsd  D61(%rip),%xmm0
  mulsd  %xmm1,%xmm2
  mulsd  %xmm1,%xmm2
  subsd  %xmm2,%xmm0
  mulsd  %xmm0,%xmm1
  movapd %xmm1,%xmm0
  movsd  %xmm1,(%rsp)
  call   <printf@plt>
  movsd  (%rsp),%xmm1
  add    $0x10,%rsp
  pop    %rbx
  movapd %xmm1,%xmm0
  ret
```

tool_calls: name: parse_data
arguments: data_tag: D85
datatype: string
name: parse_data
arguments: data_tag: D45
datatype: f64
name: parse_data
arguments: data_tag: D50
datatype: string
name: parse_data
arguments: data_tag: D62
datatype: string
name: parse_data
arguments: data_tag: D61
datatype: f64
name: parse_data
arguments: data_tag: D89
datatype: string
name: parse_data
arguments: data_tag: D74
datatype: string
name: parse_data
arguments: data_tag: D95
datatype: string
name: parse_data
arguments: data_tag: D55
datatype: string

tool: D85:   a = %.13a = %.16e


tool: D45: 0.5

tool: D50:  r0 = %.13a = %.16e


tool: D62:  r1 = %.13a = %.16e


tool: D61: 1.5

tool: D89:  r2 = %.13a = %.16e


tool: D74:  r3 = %.13a = %.16e


tool: D95:  r4 = %.13a = %.16e


tool: D55:  r5 = %.13a = %.16e


assistant: ```c
double rsqrt(double x) {
  double xhalf = 0.5 * x;
  union {
    double float64;
    int64_t int64;
  } u;
  u.float64 = x;
  printf("  a = %.13a = %.16e\n", u.float64, u.float64);
  u.int64 = 0x5fe6eb50c7aa19f9LL - (u.int64 >> 1);
  printf(" r0 = %.13a = %.16e\n", u.float64, u.float64);
  u.float64 = u.float64 * (1.5 - xhalf * u.float64 * u.float64);
  printf(" r1 = %.13a = %.16e\n", u.float64, u.float64);
  u.float64 = u.float64 * (1.5 - xhalf * u.float64 * u.float64);
  printf(" r2 = %.13a = %.16e\n", u.float64, u.float64);
  u.float64 = u.float64 * (1.5 - xhalf * u.float64 * u.float64);
  printf(" r3 = %.13a = %.16e\n", u.float64, u.float64);
  u.float64 = u.float64 * (1.5 - xhalf * u.float64 * u.float64);
  printf(" r4 = %.13a = %.16e\n", u.float64, u.float64);
  u.float64 = u.float64 * (1.5 - xhalf * u.float64 * u.float64);
  printf(" r5 = %.13a = %.16e\n", u.float64, u.float64);
  return u.float64;
}
```