user: 下面的汇编指令对应的C源代码是什么:

```asm
<poly_mult>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  movslq %esi,%rbx
  lea    (%rbx,%rcx,1),%eax
  sub    $0x28,%rsp
  mov    %rdi,0x8(%rsp)
  mov    %eax,0x4(%rsp)
  test   %ebx,%ebx
  jle    L90
  mov    %ecx,%r15d
  test   %ecx,%ecx
  jle    L90
  mov    %eax,%esi
  mov    %rdx,%r13
  lea    -0x1(%rcx),%eax
  mov    %r8,0x18(%rsp)
  movslq %esi,%r14
  mov    %r15d,%ebp
  mov    %r14,%rdx
  shl    $0x3,%rbp
  sub    %rax,%rdx
  lea    -0x10(%r8,%rdx,8),%rcx
  mov    %r14,%rdx
  sub    %rax,%rdx
  lea    -0x1(%rbx),%eax
  mov    %eax,0x10(%rsp)
  lea    -0x18(%r8,%rdx,8),%r12
  shl    $0x3,%rax
  sub    %rax,%r12
  nop
L94:
  mov    %rcx,%rdi
  mov    %rbp,%rdx
  xor    %esi,%esi
  call   <memset@plt>
  mov    %rax,%rcx
  sub    $0x8,%rcx
  cmp    %r12,%rcx
  jne    L94
  mov    0x8(%rsp),%rdi
  mov    0x18(%rsp),%r8
  movslq %r15d,%rax
  mov    %r15d,%r9d
  lea    0x0(,%rbx,8),%rdx
  mov    %r15d,0x8(%rsp)
  add    %rax,%rbx
  mov    0x4(%rsp),%ecx
  lea    (%rdi,%rdx,1),%rbp
  lea    -0x8(%rdi,%rdx,1),%rdi
  mov    0x10(%rsp),%edx
  and    $0xfffffffe,%r9d
  lea    (%r8,%r14,8),%r10
  mov    %rax,%r14
  shl    $0x3,%rax
  lea    -0x8(%r8,%rbx,8),%rsi
  shl    $0x3,%rdx
  neg    %r14
  sub    %rdx,%rdi
  mov    %r15d,%edx
  shl    $0x3,%r14
  shr    %edx
  mov    %rdi,0x10(%rsp)
  lea    -0x10(%r13,%rax,1),%rdi
  lea    -0x1(%rdx),%r11d
  mov    %r15d,%edx
  not    %r11
  and    $0x1,%edx
  lea    -0x8(%r13,%rdx,8),%rbx
  shl    $0x4,%r11
  add    %rax,%r13
  nopl   0x0(%rax)
L97:
  lea    (%r14,%rsi,1),%rax
  mov    %rbp,%rdx
  sub    $0x8,%rbp
  cmp    %rax,%rdx
  setbe  %r12b
  cmp    %rsi,%rbp
  setae  %al
  or     %eax,%r12d
  mov    %rsi,%rax
  sub    $0x8,%rsi
  cmp    %rsi,%rdi
  setne  %r15b
  cmpl   $0x1,0x8(%rsp)
  setne  0x4(%rsp)
  test   %r15b,0x4(%rsp)
  je     L77
  test   %r12b,%r12b
  je     L77
  movsd  -0x8(%rdx),%xmm2
  sub    $0x10,%rax
  xor    %r12d,%r12d
  unpcklpd %xmm2,%xmm2
  nop
L57:
  movupd (%rdi,%r12,1),%xmm0
  movupd (%rax,%r12,1),%xmm1
  shufpd $0x1,%xmm0,%xmm0
  mulpd  %xmm2,%xmm0
  shufpd $0x1,%xmm1,%xmm1
  addpd  %xmm1,%xmm0
  shufpd $0x1,%xmm0,%xmm0
  movups %xmm0,(%rax,%r12,1)
  sub    $0x10,%r12
  cmp    %r11,%r12
  jne    L57
  cmp    %r9d,0x8(%rsp)
  je     L72
  mov    %ecx,%eax
  movsd  -0x8(%rdx),%xmm0
  mulsd  (%rbx),%xmm0
  sub    %r9d,%eax
  sub    $0x2,%eax
  cltq
  lea    (%r8,%rax,8),%rax
  addsd  (%rax),%xmm0
  movsd  %xmm0,(%rax)
L72:
  sub    $0x1,%ecx
  sub    $0x8,%r10
  cmp    %rbp,0x10(%rsp)
  jne    L97
L90:
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax,%rax,1)
L77:
  xor    %eax,%eax
  nopw   0x0(%rax,%rax,1)
L37:
  movsd  -0x8(%rdx),%xmm0
  mulsd  -0x8(%r13,%rax,1),%xmm0
  addsd  -0x10(%r10,%rax,1),%xmm0
  movsd  %xmm0,-0x10(%r10,%rax,1)
  sub    $0x8,%rax
  cmp    %rax,%r14
  jne    L37
  jmp    L72
```

assistant: ```c
void poly_mult(double a[], int Na, double b[], int Nb, double ans[], int Nans) {
  int i;
  int j;
  int k;
  Nans = Na + Nb - 1;
  for (i = 0; i < Na; i++) {
    for (j = 0; j < Nb; j++) {
      k = Na + Nb - i - j - 2;
      ans[k] = 0;
    }
  }
  for (i = 0; i < Na; i++) {
    for (j = 0; j < Nb; j++) {
      k = Na + Nb - i - j - 2;
      ans[k] = ans[k] + a[Na - i - 1] * b[Nb - j - 1];
    }
  }
}
```