user: 请从给定的汇编指令推导出C源代码:

```asm
<vec_mult>:
  endbr64
  push   %r14
  push   %r13
  mov    %ecx,%r13d
  push   %r12
  mov    %rsi,%r12
  push   %rbp
  mov    %rdx,%rbp
  mov    %ecx,%edx
  push   %rbx
  mov    %rbp,%rsi
  mov    %rdi,%rbx
  mov    %r12,%rdi
  call   <init@plt>
  test   %r13d,%r13d
  jle    L56
  lea    0x4(%rbp),%rdx
  mov    %rbx,%rax
  sub    %rdx,%rax
  cmp    $0x8,%rax
  lea    -0x1(%r13),%eax
  seta   %dl
  cmp    $0x2,%eax
  seta   %al
  test   %al,%dl
  je     L104
  lea    0x4(%r12),%rdx
  mov    %rbx,%rax
  sub    %rdx,%rax
  cmp    $0x8,%rax
  jbe    L104
  mov    %r13d,%edx
  xor    %eax,%eax
  shr    $0x2,%edx
  shl    $0x4,%rdx
  nopw   0x0(%rax,%rax,1)
L20:
  movdqu (%r12,%rax,1),%xmm0
  movdqu 0x0(%rbp,%rax,1),%xmm2
  movdqu (%r12,%rax,1),%xmm1
  movdqu 0x0(%rbp,%rax,1),%xmm3
  psrlq  $0x20,%xmm0
  psrlq  $0x20,%xmm2
  pmuludq %xmm3,%xmm1
  pmuludq %xmm2,%xmm0
  pshufd $0x8,%xmm1,%xmm1
  pshufd $0x8,%xmm0,%xmm0
  punpckldq %xmm0,%xmm1
  movups %xmm1,(%rbx,%rax,1)
  add    $0x10,%rax
  cmp    %rdx,%rax
  jne    L20
  mov    %r13d,%edx
  and    $0xfffffffc,%edx
  test   $0x3,%r13b
  je     L125
  mov    %edx,%ecx
  mov    (%r12,%rcx,4),%esi
  imul   0x0(%rbp,%rcx,4),%esi
  lea    0x0(,%rcx,4),%rax
  mov    %esi,(%rbx,%rcx,4)
  lea    0x1(%rdx),%ecx
  cmp    %ecx,%r13d
  jle    L125
  mov    0x4(%r12,%rax,1),%ecx
  imul   0x4(%rbp,%rax,1),%ecx
  add    $0x2,%edx
  mov    %ecx,0x4(%rbx,%rax,1)
  cmp    %edx,%r13d
  jle    L125
  mov    0x8(%r12,%rax,1),%edx
  imul   0x8(%rbp,%rax,1),%edx
  mov    %edx,0x8(%rbx,%rax,1)
L125:
  mov    %r13d,%esi
  mov    %r12,%rdi
  call   <maybe_init_again@plt>
  mov    %r13d,%esi
  mov    %rbp,%rdi
  call   <maybe_init_again@plt>
  mov    %r13d,%edx
  xor    %eax,%eax
  shr    $0x2,%edx
  shl    $0x4,%rdx
  nopl   (%rax)
L48:
  movdqu (%r12,%rax,1),%xmm0
  movdqu 0x0(%rbp,%rax,1),%xmm2
  movdqu (%r12,%rax,1),%xmm1
  movdqu 0x0(%rbp,%rax,1),%xmm4
  psrlq  $0x20,%xmm0
  psrlq  $0x20,%xmm2
  pmuludq %xmm4,%xmm1
  pmuludq %xmm2,%xmm0
  pshufd $0x8,%xmm1,%xmm1
  pshufd $0x8,%xmm0,%xmm0
  punpckldq %xmm0,%xmm1
  movdqu (%rbx,%rax,1),%xmm0
  paddd  %xmm1,%xmm0
  movups %xmm0,(%rbx,%rax,1)
  add    $0x10,%rax
  cmp    %rax,%rdx
  jne    L48
  mov    %r13d,%edx
  and    $0xfffffffc,%edx
  test   $0x3,%r13b
  je     L65
  mov    %edx,%esi
  lea    0x0(,%rsi,4),%rax
  mov    (%r12,%rsi,4),%ecx
  imul   0x0(%rbp,%rsi,4),%ecx
  add    %ecx,(%rbx,%rax,1)
  lea    0x1(%rdx),%ecx
  cmp    %r13d,%ecx
  jge    L65
  add    $0x2,%edx
  mov    0x4(%r12,%rax,1),%ecx
  imul   0x4(%rbp,%rax,1),%ecx
  add    %ecx,0x4(%rbx,%rax,1)
  cmp    %edx,%r13d
  jle    L65
  mov    0x8(%r12,%rax,1),%edx
  imul   0x8(%rbp,%rax,1),%edx
  add    %edx,0x8(%rbx,%rax,1)
L65:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  ret
  nopl   (%rax)
L104:
  mov    %r13d,%r14d
  xor    %eax,%eax
  nopl   (%rax)
L60:
  mov    (%r12,%rax,4),%edx
  imul   0x0(%rbp,%rax,4),%edx
  mov    %edx,(%rbx,%rax,4)
  add    $0x1,%rax
  cmp    %r14,%rax
  jne    L60
  mov    %r13d,%esi
  mov    %r12,%rdi
  call   <maybe_init_again@plt>
  mov    %r13d,%esi
  mov    %rbp,%rdi
  call   <maybe_init_again@plt>
  xor    %eax,%eax
  nopl   (%rax)
L11:
  mov    0x0(%rbp,%rax,4),%edx
  imul   (%r12,%rax,4),%edx
  add    %edx,(%rbx,%rax,4)
  add    $0x1,%rax
  cmp    %rax,%r14
  jne    L11
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  ret
  xchg   %ax,%ax
L56:
  mov    %r13d,%esi
  mov    %r12,%rdi
  call   <maybe_init_again@plt>
  pop    %rbx
  mov    %r13d,%esi
  mov    %rbp,%rdi
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  jmp    1070 <maybe_init_again@plt>
```

assistant: ```c
void vec_mult(int *p, int *v1, int *v2, int N) {
  int i;
  init(v1, v2, N);
#pragma omp target data map(to : v1[:N], v2[:N]) map(from : p [0:N])
  {
    int changed;
#pragma omp target
#pragma omp parallel for
    for (i = 0; i < N; i++)
      p[i] = v1[i] * v2[i];
    changed = maybe_init_again(v1, N);
#pragma omp target update if (changed) to(v1[:N])
    changed = maybe_init_again(v2, N);
#pragma omp target update if (changed) to(v2[:N])
#pragma omp target
#pragma omp parallel for
    for (i = 0; i < N; i++)
      p[i] = p[i] + (v1[i] * v2[i]);
  }
}
```