user: 请将以下的汇编代码转换成C语言代码：

```asm
<calculate_uv>:
  endbr64
  push   %r15
  movapd %xmm0,%xmm4
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %edi,-0xc(%rsp)
  mov    %esi,-0x28(%rsp)
  mov    %rdx,-0x50(%rsp)
  mov    %rcx,-0x38(%rsp)
  mov    %r8,-0x48(%rsp)
  mov    %r9,-0x30(%rsp)
  cmp    $0x1,%edi
  jle    L26
  movapd %xmm0,%xmm3
  movslq %esi,%rax
  lea    -0x1(%rsi),%ebx
  mov    $0x1,%r15d
  divsd  %xmm1,%xmm3
  lea    0x0(,%rax,8),%r13
  movslq %edi,%rax
  mov    %ebx,-0x24(%rsp)
  mov    %rax,-0x40(%rsp)
  mov    %ebx,%eax
  mov    %r13,%r14
  shr    %eax
  sub    $0x1,%eax
  shl    $0x4,%rax
  add    $0x18,%rax
  mov    %rax,-0x20(%rsp)
  mov    %ebx,%eax
  or     $0x1,%ebx
  and    $0xfffffffe,%eax
  movslq %ebx,%rdx
  mov    %eax,-0x10(%rsp)
  lea    -0x2(%rsi),%eax
  shl    $0x3,%rdx
  add    $0x2,%rax
  lea    0x8(%rdx),%rbx
  mov    %rax,-0x18(%rsp)
  movapd %xmm3,%xmm5
  unpcklpd %xmm5,%xmm5
  nopl   0x0(%rax)
L62:
  mov    -0x48(%rsp),%rax
  mov    -0x50(%rsp),%rsi
  cmpl   $0x1,-0x28(%rsp)
  mov    (%rax,%r15,8),%rdi
  mov    0x38(%rsp),%rax
  mov    (%rsi,%r15,8),%rcx
  mov    0x8(%rax,%r15,8),%r8
  mov    (%rax,%r15,8),%rax
  jle    L20
  mov    -0x30(%rsp),%rsi
  lea    0x18(%rcx),%r11
  lea    0x10(%rdi),%r12
  movapd %xmm4,%xmm6
  mov    -0x38(%rsp),%r9
  lea    0x10(%r8),%r13
  lea    0x8(%rcx),%rbp
  divsd  %xmm2,%xmm6
  mov    (%rsi,%r15,8),%rsi
  mov    %r11,-0x60(%rsp)
  mov    (%r9,%r15,8),%r9
  mov    %r12,-0x58(%rsp)
  lea    0x10(%rsi),%r11
  lea    0x8(%r9),%r10
  cmp    %r11,%r10
  setne  %r11b
  cmp    %r10,%r12
  setne  %r12b
  and    %r11d,%r12d
  cmpl   $0x2,-0x28(%rsp)
  setne  %r11b
  and    %r12d,%r11d
  cmp    %r10,%r13
  setne  %r12b
  and    %r12d,%r11d
  lea    0x10(%rcx),%r12
  cmp    %r12,%r10
  setne  %r12b
  and    %r11d,%r12d
  cmp    %rbp,-0x58(%rsp)
  setne  %r11b
  and    %r11d,%r12d
  cmp    %rbp,%r13
  lea    0x8(%rsi),%r13
  setne  %r11b
  and    %r11d,%r12d
  lea    0x18(%rsi),%r11
  cmp    %r11,%rbp
  setae  %r11b
  cmp    %r13,-0x60(%rsp)
  setbe  %r13b
  or     %r13d,%r11d
  lea    0x20(%rax),%r13
  and    %r12d,%r11d
  lea    0x8(%rax),%r12
  cmp    %r12,-0x60(%rsp)
  setbe  %r12b
  cmp    %r13,%rbp
  setae  %bpl
  or     %ebp,%r12d
  test   %r12b,%r11b
  je     L87
  lea    0x10(%rax),%r11
  sub    %r11,%r10
  cmp    $0x8,%r10
  jbe    L87
  movapd %xmm6,%xmm7
  mov    -0x20(%rsp),%r11
  mov    $0x8,%r10d
  unpcklpd %xmm7,%xmm7
L0:
  movupd (%rax,%r10,1),%xmm1
  movupd (%r8,%r10,1),%xmm0
  subpd  %xmm1,%xmm0
  movupd (%rdi,%r10,1),%xmm1
  mulpd  %xmm5,%xmm0
  subpd  %xmm0,%xmm1
  movups %xmm1,(%rcx,%r10,1)
  movupd (%rax,%r10,1),%xmm1
  movupd 0x8(%rax,%r10,1),%xmm0
  subpd  %xmm1,%xmm0
  movupd (%rsi,%r10,1),%xmm1
  mulpd  %xmm7,%xmm0
  subpd  %xmm0,%xmm1
  movups %xmm1,(%r9,%r10,1)
  add    $0x10,%r10
  cmp    %r10,%r11
  jne    L0
  mov    -0x10(%rsp),%r10d
  cmp    %r10d,-0x24(%rsp)
  je     L20
  lea    (%rax,%rdx,1),%r10
  movsd  (%r8,%rdx,1),%xmm0
  movsd  (%rdi,%rdx,1),%xmm1
  subsd  (%r10),%xmm0
  mulsd  %xmm3,%xmm0
  subsd  %xmm0,%xmm1
  movsd  %xmm1,(%rcx,%rdx,1)
  movsd  (%rax,%rbx,1),%xmm0
  subsd  (%r10),%xmm0
  movsd  (%rsi,%rdx,1),%xmm1
  mulsd  %xmm6,%xmm0
  subsd  %xmm0,%xmm1
  movsd  %xmm1,(%r9,%rdx,1)
L20:
  movsd  (%r8,%r14,1),%xmm0
  subsd  (%rax,%r14,1),%xmm0
  add    $0x1,%r15
  movsd  (%rdi,%r14,1),%xmm1
  mulsd  %xmm3,%xmm0
  subsd  %xmm0,%xmm1
  movsd  %xmm1,(%rcx,%r14,1)
  cmp    -0x40(%rsp),%r15
  jne    L62
L26:
  mov    -0x28(%rsp),%ebx
  cmp    $0x1,%ebx
  jle    L91
  divsd  %xmm2,%xmm4
  movslq -0xc(%rsp),%rax
  mov    0x38(%rsp),%rdi
  mov    -0x30(%rsp),%rcx
  mov    (%rdi,%rax,8),%rdx
  mov    -0x38(%rsp),%rdi
  mov    (%rcx,%rax,8),%rcx
  mov    (%rdi,%rax,8),%rsi
  lea    0x10(%rcx),%rdi
  lea    0x8(%rsi),%rax
  cmp    %rdi,%rax
  setne  %r8b
  cmp    $0x2,%ebx
  setne  %dil
  movapd %xmm4,%xmm1
  test   %dil,%r8b
  je     L66
  lea    0x10(%rdx),%rdi
  sub    %rdi,%rax
  cmp    $0x8,%rax
  jbe    L66
  sub    $0x1,%ebx
  movapd %xmm4,%xmm3
  mov    %ebx,%eax
  mov    %ebx,%r8d
  unpcklpd %xmm3,%xmm3
  shr    %eax
  lea    -0x1(%rax),%edi
  mov    $0x8,%eax
  shl    $0x4,%rdi
  add    $0x18,%rdi
L137:
  movupd 0x8(%rdx,%rax,1),%xmm0
  movupd (%rdx,%rax,1),%xmm5
  movupd (%rcx,%rax,1),%xmm2
  subpd  %xmm5,%xmm0
  mulpd  %xmm3,%xmm0
  subpd  %xmm0,%xmm2
  movups %xmm2,(%rsi,%rax,1)
  add    $0x10,%rax
  cmp    %rdi,%rax
  jne    L137
  mov    %r8d,%eax
  or     $0x1,%eax
  and    $0x1,%r8d
  je     L91
  cltq
  movsd  0x8(%rdx,%rax,8),%xmm4
  subsd  (%rdx,%rax,8),%xmm4
  movsd  (%rcx,%rax,8),%xmm0
  mulsd  %xmm1,%xmm4
  subsd  %xmm4,%xmm0
  movsd  %xmm0,(%rsi,%rax,8)
L91:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nop
L87:
  mov    -0x18(%rsp),%r11
  mov    $0x1,%r10d
  nopl   0x0(%rax,%rax,1)
L140:
  movsd  (%r8,%r10,8),%xmm0
  subsd  (%rax,%r10,8),%xmm0
  movsd  (%rdi,%r10,8),%xmm1
  mulsd  %xmm3,%xmm0
  subsd  %xmm0,%xmm1
  movsd  %xmm1,(%rcx,%r10,8)
  movsd  0x8(%rax,%r10,8),%xmm0
  subsd  (%rax,%r10,8),%xmm0
  movsd  (%rsi,%r10,8),%xmm1
  mulsd  %xmm6,%xmm0
  subsd  %xmm0,%xmm1
  movsd  %xmm1,(%r9,%r10,8)
  add    $0x1,%r10
  cmp    %r11,%r10
  jne    L140
  jmp    L20
L66:
  movslq -0x28(%rsp),%rax
  mov    $0x1,%edi
  nopl   0x0(%rax)
L32:
  movsd  0x8(%rdx,%rdi,8),%xmm0
  subsd  (%rdx,%rdi,8),%xmm0
  movsd  (%rcx,%rdi,8),%xmm2
  mulsd  %xmm1,%xmm0
  subsd  %xmm0,%xmm2
  movsd  %xmm2,(%rsi,%rdi,8)
  add    $0x1,%rdi
  cmp    %rdi,%rax
  jne    L32
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void calculate_uv(double dt, double dx, double dy, int imax, int jmax, double **U, double **V, double **F, double **G, double **P) {
  int i;
  int j;
  for (i = 1; i < imax; i++) {
    for (j = 1; j < jmax; j++) {
      U[i][j] = F[i][j] - dt / dx * (P[i + 1][j] - P[i][j]);
      V[i][j] = G[i][j] - dt / dy * (P[i][j + 1] - P[i][j]);
    }
    j = jmax;
    U[i][j] = F[i][j] - dt / dx * (P[i + 1][j] - P[i][j]);
  }
  i = imax;
  for (j = 1; j < jmax; j++) {
    V[i][j] = G[i][j] - dt / dy * (P[i][j + 1] - P[i][j]);
  }
}
```