user: 这段汇编代码用C语言表示是什么样的?

```asm
<update_velocity>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x18(%rbp)
  mov    %rsi,-0x20(%rbp)
  mov    %rdx,-0x28(%rbp)
  mov    %rcx,-0x30(%rbp)
  mov    %r8,-0x38(%rbp)
  mov    %r9,-0x40(%rbp)
  movss  %xmm0,-0x44(%rbp)
  movss  %xmm1,-0x48(%rbp)
  movss  %xmm2,-0x4c(%rbp)
  movl   $0x1,-0x8(%rbp)
  jmp    L34
L33:
  movl   $0x1,-0x4(%rbp)
  jmp    L58
L44:
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x4(%rbp),%eax
  cltq
  add    %rdx,%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  and    $0x10,%eax
  test   %eax,%eax
  je     L86
  mov    -0x8(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x4(%rbp),%eax
  cltq
  add    %rdx,%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  and    $0x10,%eax
  test   %eax,%eax
  je     L86
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x4(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mov    -0x8(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x4(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rdx,%rax
  movss  (%rax),%xmm1
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x4(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rdx,%rax
  movss  (%rax),%xmm2
  subss  %xmm2,%xmm1
  mulss  -0x44(%rbp),%xmm1
  divss  -0x48(%rbp),%xmm1
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x4(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rdx,%rax
  subss  %xmm1,%xmm0
  movss  %xmm0,(%rax)
L86:
  addl   $0x1,-0x4(%rbp)
L58:
  mov    -0x4(%rbp),%eax
  cmp    0x18(%rbp),%eax
  jle    L44
  addl   $0x1,-0x8(%rbp)
L34:
  mov    0x10(%rbp),%eax
  cmp    -0x8(%rbp),%eax
  jg     L33
  movl   $0x1,-0x8(%rbp)
  jmp    L12
L114:
  movl   $0x1,-0x4(%rbp)
  jmp    L3
L116:
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x4(%rbp),%eax
  cltq
  add    %rdx,%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  and    $0x10,%eax
  test   %eax,%eax
  je     L41
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x4(%rbp),%eax
  cltq
  add    $0x1,%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  and    $0x10,%eax
  test   %eax,%eax
  je     L41
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x30(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x4(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x4(%rbp),%eax
  cltq
  add    $0x1,%rax
  shl    $0x2,%rax
  add    %rdx,%rax
  movss  (%rax),%xmm1
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x4(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rdx,%rax
  movss  (%rax),%xmm2
  subss  %xmm2,%xmm1
  mulss  -0x44(%rbp),%xmm1
  divss  -0x4c(%rbp),%xmm1
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x4(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rdx,%rax
  subss  %xmm1,%xmm0
  movss  %xmm0,(%rax)
L41:
  addl   $0x1,-0x4(%rbp)
L3:
  mov    0x18(%rbp),%eax
  cmp    -0x4(%rbp),%eax
  jg     L116
  addl   $0x1,-0x8(%rbp)
L12:
  mov    -0x8(%rbp),%eax
  cmp    0x10(%rbp),%eax
  jle    L114
  nop
  nop
  pop    %rbp
  ret
```

assistant: ```c
void update_velocity(float **u, float **v, float **f, float **g, float **p, char **flag, int imax, int jmax, float del_t, float delx, float dely) {
  int i, j;
  for (i = 1; i <= imax - 1; i++) {
    for (j = 1; j <= jmax; j++) {
      if ((flag[i][j] & 0x0010) && (flag[i + 1][j] & 0x0010)) {
        u[i][j] = f[i][j] - (p[i + 1][j] - p[i][j]) * del_t / delx;
      }
    }
  }
  for (i = 1; i <= imax; i++) {
    for (j = 1; j <= jmax - 1; j++) {
      if ((flag[i][j] & 0x0010) && (flag[i][j + 1] & 0x0010)) {
        v[i][j] = g[i][j] - (p[i][j + 1] - p[i][j]) * del_t / dely;
      }
    }
  }
}
```