user: 这段汇编代码用C语言表示是什么样的:

```asm
<inner_product_single>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  mov    %rdi,%r13
  push   %r12
  push   %rbp
  mov    %edx,%ebp
  push   %rbx
  mov    %rsi,%rbx
  sub    $0x38,%rsp
  mov    %rsi,0x10(%rsp)
  mov    %fs:0x28,%rax
  mov    %rax,0x28(%rsp)
  xor    %eax,%eax
  movl   $0x0,0x24(%rsp)
  call   <_mm_setzero_ps@plt>
  cmp    $0x7,%ebp
  jbe    L23
  mov    %eax,%r14d
  lea    -0x8(%rbp),%eax
  mov    %rbx,%rcx
  mov    %rbx,%r15
  mov    %eax,0x18(%rsp)
  shr    $0x3,%eax
  mov    %r13,%rbx
  mov    %eax,0x1c(%rsp)
  shl    $0x5,%rax
  lea    0x20(%rcx,%rax,1),%rax
  mov    %rax,0x8(%rsp)
  nopl   (%rax)
L63:
  mov    %r15,%rdi
  call   <_mm_loadu_ps@plt>
  mov    %rbx,%rdi
  mov    %eax,%r12d
  call   <_mm_loadu_ps@plt>
  mov    %r12d,%esi
  mov    %eax,%edi
  call   <_mm_mul_ps@plt>
  mov    %r14d,%edi
  mov    %eax,%esi
  call   <_mm_add_ps@plt>
  lea    0x10(%r15),%rdi
  add    $0x20,%r15
  mov    %eax,%r14d
  call   <_mm_loadu_ps@plt>
  lea    0x10(%rbx),%rdi
  add    $0x20,%rbx
  mov    %eax,%r12d
  call   <_mm_loadu_ps@plt>
  mov    %r12d,%esi
  mov    %eax,%edi
  call   <_mm_mul_ps@plt>
  mov    %r14d,%edi
  mov    %eax,%esi
  call   <_mm_add_ps@plt>
  mov    %eax,%r14d
  cmp    0x8(%rsp),%r15
  jne    L63
  mov    0x1c(%rsp),%eax
  mov    %r14d,%esi
  mov    %r14d,%edi
  mov    0x18(%rsp),%r15d
  lea    0x8(,%rax,8),%ebx
  and    $0xfffffff8,%r15d
  call   <_mm_movehl_ps@plt>
  mov    %r14d,%edi
  add    $0x8,%r15d
  mov    %eax,%esi
  call   <_mm_add_ps@plt>
  mov    $0x55,%edx
  mov    %eax,%esi
  mov    %eax,%edi
  mov    %eax,%r14d
  call   <_mm_shuffle_ps@plt>
  mov    %r14d,%edi
  mov    %eax,%esi
  call   <_mm_add_ss@plt>
  lea    0x24(%rsp),%rdi
  mov    %eax,%esi
  call   <_mm_store_ss@plt>
L5:
  movss  0x24(%rsp),%xmm0
  cmp    %r15d,%ebp
  jbe    L30
  lea    0x1(%rbx),%edx
  mov    %ebp,%eax
  mov    $0x1,%edi
  sub    %ebx,%eax
  cmp    %edx,%ebp
  cmovae %eax,%edi
  sub    $0x1,%eax
  cmp    $0x2,%eax
  jbe    L66
  cmp    %edx,%ebp
  jb     L66
  movslq %ebx,%rdx
  mov    %edi,%ecx
  xor    %eax,%eax
  shl    $0x2,%rdx
  shr    $0x2,%ecx
  lea    0x0(%r13,%rdx,1),%rsi
  shl    $0x4,%rcx
  add    0x10(%rsp),%rdx
  nopl   0x0(%rax)
L109:
  movups (%rsi,%rax,1),%xmm1
  movups (%rdx,%rax,1),%xmm3
  add    $0x10,%rax
  mulps  %xmm3,%xmm1
  addss  %xmm1,%xmm0
  movaps %xmm1,%xmm2
  shufps $0x55,%xmm1,%xmm2
  addss  %xmm2,%xmm0
  movaps %xmm1,%xmm2
  unpckhps %xmm1,%xmm2
  shufps $0xff,%xmm1,%xmm1
  addss  %xmm2,%xmm0
  addss  %xmm1,%xmm0
  cmp    %rcx,%rax
  jne    L109
  mov    %edi,%eax
  and    $0xfffffffc,%eax
  add    %eax,%ebx
  cmp    %edi,%eax
  je     L30
  lea    0x1(%rbx),%edx
L66:
  mov    0x10(%rsp),%rsi
  movslq %ebx,%rcx
  movss  0x0(%r13,%rcx,4),%xmm1
  lea    0x0(,%rcx,4),%rax
  mulss  (%rsi,%rcx,4),%xmm1
  addss  %xmm1,%xmm0
  cmp    %edx,%ebp
  jbe    L30
  movss  0x4(%r13,%rax,1),%xmm1
  mulss  0x4(%rsi,%rax,1),%xmm1
  add    $0x2,%ebx
  addss  %xmm1,%xmm0
  cmp    %ebx,%ebp
  jbe    L30
  movss  0x8(%rsi,%rax,1),%xmm1
  mulss  0x8(%r13,%rax,1),%xmm1
  addss  %xmm1,%xmm0
L30:
  mov    0x28(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L90
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopw   0x0(%rax,%rax,1)
L23:
  xor    %r15d,%r15d
  xor    %ebx,%ebx
  jmp    L5
L90:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
float inner_product_single(const float *a, const float *b, unsigned int len) {
  int i = 0;
  float ret = 0;
  __m128 sum = _mm_setzero_ps();
  if (len > 7) {
    for (; i < len - 7; i += 8) {
      sum = _mm_add_ps(sum, _mm_mul_ps(_mm_loadu_ps(a + i), _mm_loadu_ps(b + i)));
      sum = _mm_add_ps(sum, _mm_mul_ps(_mm_loadu_ps(a + i + 4), _mm_loadu_ps(b + i + 4)));
    }
    sum = _mm_add_ps(sum, _mm_movehl_ps(sum, sum));
    sum = _mm_add_ss(sum, _mm_shuffle_ps(sum, sum, 0x55));
    _mm_store_ss(&ret, sum);
  }
  for (; i < len; i++)
    ret += a[i] * b[i];
  return ret;
}
```