user: 下面的汇编指令对应的C源代码是什么：

```asm
<pw>:
  endbr64
  mov    $0x1,%eax
  test   %rsi,%rsi
  jne    L23
  ret
  nop
L23:
  push   %r14
  mov    %rsi,%rdx
  push   %r13
  shr    $0x3f,%rdx
  push   %r12
  add    %rsi,%rdx
  push   %rbp
  push   %rbx
  mov    %rsi,%rbx
  sub    $0x10,%rsp
  sar    %rdx
  mov    %rdx,%r12
  je     L117
  test   %rsi,%rsi
  lea    0x3(%rsi),%rax
  mov    $0x1,%edx
  cmovns %rsi,%rax
  sar    $0x2,%rax
  mov    %rax,%r13
  jne    L111
L36:
  and    $0x1,%r12d
  je     L11
  movabs $0x89705f3112a28fe5,%rcx
  mov    %rdx,%rsi
  imul   %rdi,%rsi
  mov    %rsi,%rax
  imul   %rcx
  mov    %rsi,%rax
  sar    $0x3f,%rax
  add    %rsi,%rdx
  sar    $0x1d,%rdx
  sub    %rax,%rdx
  imul   $0x3b9aca07,%rdx,%rax
  sub    %rax,%rsi
  imul   %rsi,%rsi
  mov    %rsi,%rax
  imul   %rcx
  lea    (%rdx,%rsi,1),%rax
  mov    %rsi,%rdx
  sar    $0x3f,%rdx
  sar    $0x1d,%rax
  sub    %rdx,%rax
  imul   $0x3b9aca07,%rax,%rdx
  mov    %rsi,%rax
  sub    %rdx,%rax
L117:
  and    $0x1,%ebx
  je     L46
  movabs $0x89705f3112a28fe5,%rdx
  imul   %rax,%rdi
  mov    %rdi,%rax
  imul   %rdx
  lea    (%rdx,%rdi,1),%rax
  mov    %rdi,%rdx
  sar    $0x3f,%rdx
  sar    $0x1d,%rax
  sub    %rdx,%rax
  imul   $0x3b9aca07,%rax,%rdx
  mov    %rdi,%rax
  sub    %rdx,%rax
L46:
  add    $0x10,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  ret
  nopl   0x0(%rax)
L11:
  mov    %rdx,%rcx
  imul   %rdx,%rcx
  movabs $0x89705f3112a28fe5,%rdx
  mov    %rcx,%rax
  mul    %rdx
  mov    %rdx,%rax
  shr    $0x1d,%rax
  imul   $0x3b9aca07,%rax,%rdx
  mov    %rcx,%rax
  sub    %rdx,%rax
  jmp    L117
  nopl   (%rax)
L111:
  test   %rsi,%rsi
  lea    0x7(%rsi),%rax
  cmovns %rsi,%rax
  sar    $0x3,%rax
  mov    %rax,%r14
  je     L59
  test   %rbx,%rbx
  lea    0xf(%rsi),%rsi
  mov    %rdi,0x8(%rsp)
  cmovns %rbx,%rsi
  sar    $0x4,%rsi
  call   <pw>
  mov    0x8(%rsp),%rdi
  movabs $0x89705f3112a28fe5,%rcx
  imul   %rax,%rax
  mov    %rax,%rsi
  mul    %rcx
  shr    $0x1d,%rdx
  imul   $0x3b9aca07,%rdx,%rax
  sub    %rax,%rsi
  and    $0x1,%r14d
  je     L94
  imul   %rdi,%rsi
  mov    %rsi,%rax
  imul   %rcx
  lea    (%rdx,%rsi,1),%rax
  mov    %rsi,%rdx
  sar    $0x3f,%rdx
  sar    $0x1d,%rax
  sub    %rdx,%rax
  imul   $0x3b9aca07,%rax,%rdx
  mov    %rsi,%rax
  sub    %rdx,%rax
  imul   %rax,%rax
  mov    %rax,%rsi
  imul   %rcx
  mov    %rsi,%rax
  sar    $0x3f,%rax
  add    %rsi,%rdx
  sar    $0x1d,%rdx
  sub    %rax,%rdx
  imul   $0x3b9aca07,%rdx,%rax
  sub    %rax,%rsi
  mov    %rsi,%rdx
L59:
  and    $0x1,%r13d
  jne    L69
  mov    %rdx,%rcx
  imul   %rdx,%rcx
  movabs $0x89705f3112a28fe5,%rdx
  mov    %rcx,%rax
  mul    %rdx
  shr    $0x1d,%rdx
  imul   $0x3b9aca07,%rdx,%rax
  sub    %rax,%rcx
  mov    %rcx,%rdx
  jmp    L36
  cs nopw 0x0(%rax,%rax,1)
L69:
  movabs $0x89705f3112a28fe5,%rcx
  mov    %rdx,%rsi
  imul   %rdi,%rsi
  mov    %rsi,%rax
  imul   %rcx
  mov    %rsi,%rax
  sar    $0x3f,%rax
  add    %rsi,%rdx
  sar    $0x1d,%rdx
  sub    %rax,%rdx
  imul   $0x3b9aca07,%rdx,%rax
  sub    %rax,%rsi
  imul   %rsi,%rsi
  mov    %rsi,%rax
  imul   %rcx
  mov    %rsi,%rax
  sar    $0x3f,%rax
  add    %rsi,%rdx
  sar    $0x1d,%rdx
  sub    %rax,%rdx
  imul   $0x3b9aca07,%rdx,%rax
  sub    %rax,%rsi
  mov    %rsi,%rdx
  jmp    L36
  nop
L94:
  imul   %rsi,%rsi
  mov    %rsi,%rax
  mul    %rcx
  shr    $0x1d,%rdx
  imul   $0x3b9aca07,%rdx,%rax
  sub    %rax,%rsi
  mov    %rsi,%rdx
  jmp    L59
```

assistant: ```c
long long int pw(long long int a, long long int b) {
  long long int r;
  if (b == 0)
    return 1;
  r = pw(a, b / 2);
  r = (r * r) % 1000000007;
  if (b % 2)
    r = (r * a) % 1000000007;
  return r;
}
```