user: 这段汇编代码用C语言表示是什么样的?

```asm
<smix>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x68,%rsp
  mov    %rdi,-0x48(%rbp)
  mov    %rsi,-0x50(%rbp)
  mov    %edx,-0x54(%rbp)
  mov    %rcx,-0x60(%rbp)
  mov    %r8,-0x68(%rbp)
  mov    -0x68(%rbp),%rax
  mov    %rax,-0x28(%rbp)
  mov    -0x50(%rbp),%rax
  shl    $0x7,%rax
  mov    %rax,%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x20(%rbp)
  mov    -0x50(%rbp),%rax
  shl    $0x8,%rax
  mov    %rax,%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x18(%rbp)
  movq   $0x0,-0x30(%rbp)
  jmp    L7
L52:
  mov    -0x30(%rbp),%rax
  shl    $0x4,%rax
  mov    %rax,%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  mov    -0x30(%rbp),%rdx
  lea    0x0(,%rdx,4),%rcx
  mov    -0x28(%rbp),%rdx
  lea    (%rcx,%rdx,1),%rbx
  mov    %rax,%rdi
  call   <libcperciva_le32dec@plt>
  mov    %eax,(%rbx)
  addq   $0x1,-0x30(%rbp)
L7:
  mov    -0x50(%rbp),%rax
  shl    $0x5,%rax
  cmp    %rax,-0x30(%rbp)
  jb     L52
  movl   $0x0,-0x38(%rbp)
  jmp    L56
L74:
  mov    -0x50(%rbp),%rax
  shl    $0x7,%eax
  mov    %eax,%edx
  mov    -0x38(%rbp),%eax
  cltq
  imul   -0x50(%rbp),%rax
  shl    $0x7,%rax
  mov    %rax,%rcx
  mov    -0x60(%rbp),%rax
  add    %rax,%rcx
  mov    -0x28(%rbp),%rax
  mov    %rax,%rsi
  mov    %rcx,%rdi
  call   <blkcpy@plt>
  mov    -0x50(%rbp),%rcx
  mov    -0x18(%rbp),%rdx
  mov    -0x20(%rbp),%rsi
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <blockmix_salsa8@plt>
  mov    -0x50(%rbp),%rax
  shl    $0x7,%eax
  mov    %eax,%edx
  mov    -0x38(%rbp),%eax
  add    $0x1,%eax
  cltq
  imul   -0x50(%rbp),%rax
  shl    $0x7,%rax
  mov    %rax,%rcx
  mov    -0x60(%rbp),%rax
  add    %rax,%rcx
  mov    -0x20(%rbp),%rax
  mov    %rax,%rsi
  mov    %rcx,%rdi
  call   <blkcpy@plt>
  mov    -0x50(%rbp),%rcx
  mov    -0x18(%rbp),%rdx
  mov    -0x28(%rbp),%rsi
  mov    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <blockmix_salsa8@plt>
  addl   $0x2,-0x38(%rbp)
L56:
  mov    -0x38(%rbp),%eax
  cmp    -0x54(%rbp),%eax
  jl     L74
  movl   $0x0,-0x38(%rbp)
  jmp    L41
L20:
  mov    -0x50(%rbp),%rdx
  mov    -0x28(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <integerify@plt>
  mov    %eax,%edx
  mov    -0x54(%rbp),%eax
  sub    $0x1,%eax
  and    %edx,%eax
  mov    %eax,-0x34(%rbp)
  mov    -0x50(%rbp),%rax
  shl    $0x7,%eax
  mov    %eax,%edx
  mov    -0x34(%rbp),%eax
  cltq
  imul   -0x50(%rbp),%rax
  shl    $0x7,%rax
  mov    %rax,%rcx
  mov    -0x60(%rbp),%rax
  add    %rax,%rcx
  mov    -0x28(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <blkxor@plt>
  mov    -0x50(%rbp),%rcx
  mov    -0x18(%rbp),%rdx
  mov    -0x20(%rbp),%rsi
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <blockmix_salsa8@plt>
  mov    -0x50(%rbp),%rdx
  mov    -0x20(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <integerify@plt>
  mov    %eax,%edx
  mov    -0x54(%rbp),%eax
  sub    $0x1,%eax
  and    %edx,%eax
  mov    %eax,-0x34(%rbp)
  mov    -0x50(%rbp),%rax
  shl    $0x7,%eax
  mov    %eax,%edx
  mov    -0x34(%rbp),%eax
  cltq
  imul   -0x50(%rbp),%rax
  shl    $0x7,%rax
  mov    %rax,%rcx
  mov    -0x60(%rbp),%rax
  add    %rax,%rcx
  mov    -0x20(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <blkxor@plt>
  mov    -0x50(%rbp),%rcx
  mov    -0x18(%rbp),%rdx
  mov    -0x28(%rbp),%rsi
  mov    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <blockmix_salsa8@plt>
  addl   $0x2,-0x38(%rbp)
L41:
  mov    -0x38(%rbp),%eax
  cmp    -0x54(%rbp),%eax
  jl     L20
  movq   $0x0,-0x30(%rbp)
  jmp    L8
L72:
  mov    -0x30(%rbp),%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  mov    -0x30(%rbp),%rdx
  mov    %rdx,%rcx
  shl    $0x4,%rcx
  mov    -0x48(%rbp),%rdx
  add    %rcx,%rdx
  mov    %eax,%esi
  mov    %rdx,%rdi
  call   <libcperciva_le32enc@plt>
  addq   $0x1,-0x30(%rbp)
L8:
  mov    -0x50(%rbp),%rax
  shl    $0x5,%rax
  cmp    %rax,-0x30(%rbp)
  jb     L72
  nop
  nop
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

assistant: ```c
void smix(uint8_t *B, size_t r, uint64_t N, uint32_t *V, uint32_t *XY) {
  uint32_t *X = XY;
  uint32_t *Y = &XY[32 * r];
  uint32_t *Z = &XY[64 * r];
  uint64_t i;
  uint64_t j;
  size_t k;
  for (k = 0; k < 32 * r; k++)
    X[k] = libcperciva_le32dec(&B[4 * k]);
  for (i = 0; i < N; i += 2) {
    blkcpy(&V[i * (32 * r)], X, 128 * r);
    blockmix_salsa8(X, Y, Z, r);
    blkcpy(&V[(i + 1) * (32 * r)], Y, 128 * r);
    blockmix_salsa8(Y, X, Z, r);
  }
  for (i = 0; i < N; i += 2) {
    j = integerify(X, r) & (N - 1);
    blkxor(X, &V[j * (32 * r)], 128 * r);
    blockmix_salsa8(X, Y, Z, r);
    j = integerify(Y, r) & (N - 1);
    blkxor(Y, &V[j * (32 * r)], 128 * r);
    blockmix_salsa8(Y, X, Z, r);
  }
  for (k = 0; k < 32 * r; k++)
    libcperciva_le32enc(&B[4 * k], X[k]);
}
```