user: 下面的汇编指令对应的C源代码是什么:

```asm
<calculate_uv>:
  endbr64
  push   %r15
  movapd %xmm0,%xmm3
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %esi,%ebx
  mov    0x38(%rsp),%r12
  mov    %edi,-0x20(%rsp)
  mov    %rcx,-0x18(%rsp)
  mov    %r9,-0x10(%rsp)
  cmp    $0x1,%edi
  jle    L171
  test   %esi,%esi
  jle    L138
  movapd %xmm0,%xmm4
  movslq %edi,%rax
  mov    %rdx,%rbp
  mov    %esi,%edx
  divsd  %xmm1,%xmm4
  mov    %rax,-0x28(%rsp)
  mov    %esi,%eax
  or     $0x1,%edx
  shr    %eax
  mov    %r8,%r13
  shl    $0x3,%rdx
  mov    $0x1,%r10d
  lea    -0x1(%rax),%r11d
  mov    %esi,%eax
  lea    0x1(%rsi),%r14d
  and    $0xfffffffe,%eax
  shl    $0x4,%r11
  mov    %eax,-0x1c(%rsp)
  add    $0x18,%r11
  movapd %xmm4,%xmm5
  unpcklpd %xmm5,%xmm5
  nopw   0x0(%rax,%rax,1)
L19:
  mov    0x0(%r13,%r10,8),%rcx
  mov    0x0(%rbp,%r10,8),%rdi
  mov    0x8(%r12,%r10,8),%rsi
  mov    (%r12,%r10,8),%r8
  lea    0x8(%rdi),%r9
  lea    0x10(%rcx),%rax
  cmp    %rax,%r9
  lea    0x10(%rsi),%rax
  setne  %r15b
  cmp    %rax,%r9
  setne  %al
  and    %r15d,%eax
  cmp    $0x1,%ebx
  setne  %r15b
  test   %r15b,%al
  je     L167
  lea    0x10(%r8),%r15
  mov    $0x8,%eax
  cmp    %r15,%r9
  je     L167
  nopl   0x0(%rax)
L166:
  movupd (%rsi,%rax,1),%xmm0
  movupd (%r8,%rax,1),%xmm6
  movupd (%rcx,%rax,1),%xmm1
  subpd  %xmm6,%xmm0
  mulpd  %xmm5,%xmm0
  subpd  %xmm0,%xmm1
  movups %xmm1,(%rdi,%rax,1)
  add    $0x10,%rax
  cmp    %rax,%r11
  jne    L166
  cmp    -0x1c(%rsp),%ebx
  je     L163
  movsd  (%rsi,%rdx,1),%xmm0
  subsd  (%r8,%rdx,1),%xmm0
  movsd  (%rcx,%rdx,1),%xmm1
  mulsd  %xmm4,%xmm0
  subsd  %xmm0,%xmm1
  movsd  %xmm1,(%rdi,%rdx,1)
L163:
  add    $0x1,%r10
  cmp    -0x28(%rsp),%r10
  jne    L19
L142:
  cmp    $0x1,%ebx
  jle    L138
  divsd  %xmm2,%xmm3
  lea    -0x1(%rbx),%r14d
  mov    $0x1,%edi
  movslq %ebx,%r13
  mov    %r14d,%eax
  mov    %r14d,%r15d
  mov    %r14d,%edx
  mov    %r14d,-0x1c(%rsp)
  shr    %eax
  and    $0xfffffffe,%r15d
  or     $0x1,%edx
  mov    -0x18(%rsp),%r14
  lea    -0x1(%rax),%r8d
  mov    %r15d,-0x28(%rsp)
  shl    $0x3,%rdx
  mov    -0x10(%rsp),%r15
  shl    $0x4,%r8
  lea    0x8(%rdx),%r9
  add    $0x18,%r8
  movapd %xmm3,%xmm2
  unpcklpd %xmm2,%xmm2
  cs nopw 0x0(%rax,%rax,1)
L54:
  mov    (%r15,%rdi,8),%rcx
  mov    (%r14,%rdi,8),%rsi
  mov    (%r12,%rdi,8),%rax
  lea    0x10(%rcx),%r11
  lea    0x8(%rsi),%r10
  cmp    %r11,%r10
  setne  %bpl
  cmp    $0x2,%ebx
  setne  %r11b
  test   %r11b,%bpl
  je     L87
  lea    0x10(%rax),%r11
  sub    %r11,%r10
  mov    $0x8,%r11d
  cmp    $0x8,%r10
  jbe    L87
  nopw   0x0(%rax,%rax,1)
L162:
  movupd 0x8(%rax,%r11,1),%xmm0
  movupd (%rax,%r11,1),%xmm7
  movupd (%rcx,%r11,1),%xmm1
  subpd  %xmm7,%xmm0
  mulpd  %xmm2,%xmm0
  subpd  %xmm0,%xmm1
  movups %xmm1,(%rsi,%r11,1)
  add    $0x10,%r11
  cmp    %r11,%r8
  jne    L162
  mov    -0x1c(%rsp),%r11d
  cmp    %r11d,-0x28(%rsp)
  je     L9
  movsd  (%rax,%r9,1),%xmm0
  subsd  (%rax,%rdx,1),%xmm0
  movsd  (%rcx,%rdx,1),%xmm1
  mulsd  %xmm3,%xmm0
  subsd  %xmm0,%xmm1
  movsd  %xmm1,(%rsi,%rdx,1)
L9:
  add    $0x1,%rdi
  cmp    %edi,-0x20(%rsp)
  jge    L54
L138:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopw   0x0(%rax,%rax,1)
L167:
  mov    $0x1,%eax
  nopl   (%rax)
L57:
  movsd  (%rsi,%rax,8),%xmm0
  subsd  (%r8,%rax,8),%xmm0
  movsd  (%rcx,%rax,8),%xmm1
  mulsd  %xmm4,%xmm0
  subsd  %xmm0,%xmm1
  movsd  %xmm1,(%rdi,%rax,8)
  add    $0x1,%rax
  cmp    %r14,%rax
  jne    L57
  jmp    L163
  nopl   0x0(%rax,%rax,1)
L87:
  mov    $0x1,%r10d
  xchg   %ax,%ax
L86:
  movsd  0x8(%rax,%r10,8),%xmm0
  subsd  (%rax,%r10,8),%xmm0
  movsd  (%rcx,%r10,8),%xmm1
  mulsd  %xmm3,%xmm0
  subsd  %xmm0,%xmm1
  movsd  %xmm1,(%rsi,%r10,8)
  add    $0x1,%r10
  cmp    %r13,%r10
  jne    L86
  jmp    L9
L171:
  je     L142
  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, j;
  for (i = 1; i < imax; i++) {
    for (j = 1; j < jmax + 1; j++) {
      U[i][j] = F[i][j] - dt / dx * (P[i + 1][j] - P[i][j]);
    }
  }
  for (i = 1; i < imax + 1; i++) {
    for (j = 1; j < jmax; j++) {
      V[i][j] = G[i][j] - dt / dy * (P[i][j + 1] - P[i][j]);
    }
  }
}
```