user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<smatvec>:
  endbr64
  push   %r15
  mov    %r9,%r15
  push   %r14
  mov    %esi,%r14d
  push   %r13
  push   %r12
  mov    %rcx,%r12
  push   %rbp
  push   %rbx
  sub    $0x70,%rsp
  mov    %edi,0x50(%rsp)
  mov    %edx,0x3c(%rsp)
  mov    %r8,0x40(%rsp)
  cmp    $0x7,%edx
  jle    L161
  movslq %edi,%rax
  mov    %edx,%ebx
  mov    %r14d,-0x44(%rsp)
  mov    %r12,%r11
  lea    0x0(,%rax,8),%r13
  mov    %rax,%rsi
  mov    %r12,0x60(%rsp)
  mov    %r8,%rbp
  lea    0x8(%rcx,%r13,1),%rdx
  shl    $0x6,%rsi
  lea    (%rax,%rax,4),%rcx
  mov    %r13,-0x78(%rsp)
  mov    %rdx,-0x50(%rsp)
  lea    -0x8(%rbx),%edx
  shl    $0x3,%rcx
  shr    $0x3,%edx
  mov    %rsi,-0x28(%rsp)
  mov    %edx,%ebx
  mov    %edx,0x54(%rsp)
  mov    %rbx,%rdx
  mov    %rbx,0x58(%rsp)
  shl    $0x6,%rdx
  mov    %rcx,(%rsp)
  lea    0x40(%r8,%rdx,1),%rbx
  lea    (%rax,%rax,2),%rdx
  mov    %rbx,-0x20(%rsp)
  mov    %rax,%rbx
  lea    0x0(,%rdx,8),%rsi
  shl    $0x4,%rbx
  mov    %rsi,-0x8(%rsp)
  mov    %rbx,-0x18(%rsp)
  mov    %rax,%rbx
  shl    $0x5,%rbx
  mov    %rbx,-0x10(%rsp)
  mov    %rdx,%rbx
  mov    %r13,%rdx
  sub    %rax,%rdx
  shl    $0x4,%rbx
  lea    0x0(,%rdx,8),%rax
  mov    %rbx,0x8(%rsp)
  mov    %rax,0x10(%rsp)
  lea    0x0(%r13,%rsi,1),%rax
  mov    %rax,0x18(%rsp)
  lea    0x0(%r13,%rcx,1),%rax
  mov    %rax,0x28(%rsp)
  lea    0x0(%r13,%rbx,1),%rax
  mov    %r14d,%ebx
  mov    %rax,0x30(%rsp)
  mov    %r14d,%eax
  and    $0xfffffffe,%ebx
  shr    %eax
  mov    %ebx,0x38(%rsp)
  sub    $0x1,%eax
  add    $0x1,%rax
  shl    $0x4,%rax
  mov    %rax,0x20(%rsp)
  mov    %ebx,%eax
  lea    0x0(,%rax,8),%rsi
  movslq %ebx,%rax
  lea    (%r9,%rax,8),%rbx
  lea    -0x1(%r14),%eax
  mov    %rsi,%r12
  mov    %rax,0x48(%rsp)
  nopl   0x0(%rax)
L97:
  mov    -0x18(%rsp),%rcx
  mov    0x8(%rsp),%rdi
  mov    -0x78(%rsp),%r14
  mov    -0x44(%rsp),%r8d
  lea    (%rcx,%r11,1),%rdx
  mov    -0x8(%rsp),%rcx
  lea    (%r11,%rdi,1),%r9
  movsd  0x0(%rbp),%xmm0
  mov    %r9,-0x30(%rsp)
  mov    0x10(%rsp),%r9
  lea    (%r14,%r11,1),%rax
  lea    (%r11,%rcx,1),%rsi
  mov    -0x10(%rsp),%rcx
  movsd  0x8(%rbp),%xmm9
  add    %r11,%r9
  movsd  0x10(%rbp),%xmm10
  movsd  0x18(%rbp),%xmm11
  add    %r11,%rcx
  mov    %r9,-0x38(%rsp)
  movsd  0x20(%rbp),%xmm12
  mov    %rcx,-0x40(%rsp)
  mov    (%rsp),%rcx
  movsd  0x28(%rbp),%xmm13
  movsd  0x30(%rbp),%xmm14
  movsd  0x38(%rbp),%xmm15
  add    %r11,%rcx
  test   %r8d,%r8d
  jle    L88
  add    -0x50(%rsp),%rdi
  mov    %r14,%r9
  mov    %rdi,%r13
  sub    %r14,%rdi
  mov    %rdi,%r10
  mov    %rdi,%r14
  mov    %r9,%rdi
  sub    %r9,%r10
  mov    %r10,%r9
  sub    %rdi,%r9
  mov    %r9,%rdi
  sub    -0x78(%rsp),%rdi
  cmp    $0x1,%r8d
  setne  -0x68(%rsp)
  cmp    -0x50(%rsp),%r15
  setne  %r8b
  and    -0x68(%rsp),%r8b
  cmp    %r13,%r15
  setne  %r13b
  and    %r8d,%r13d
  cmp    %r14,%r15
  mov    -0x78(%rsp),%r14
  setne  %r8b
  and    %r13d,%r8d
  cmp    %r10,%r15
  setne  %r10b
  and    %r10d,%r8d
  cmp    %r9,%r15
  setne  %r10b
  and    %r8d,%r10d
  cmp    %rdi,%r15
  setne  %r8b
  sub    %r14,%rdi
  and    %r10d,%r8d
  cmp    %rdi,%r15
  setne  %dil
  test   %dil,%r8b
  je     L204
  lea    0x8(%r11),%rdi
  cmp    %rdi,%r15
  je     L204
  mov    0x18(%rsp),%rdi
  movapd %xmm14,%xmm1
  movapd %xmm0,%xmm8
  movapd %xmm9,%xmm7
  unpcklpd %xmm1,%xmm1
  movapd %xmm10,%xmm6
  movapd %xmm11,%xmm5
  mov    0x20(%rsp),%r13
  lea    (%r11,%rdi,1),%r10
  mov    0x28(%rsp),%rdi
  movaps %xmm1,-0x78(%rsp)
  movapd %xmm15,%xmm1
  movapd %xmm12,%xmm4
  movapd %xmm13,%xmm3
  unpcklpd %xmm1,%xmm1
  lea    (%r11,%rdi,1),%r9
  mov    0x30(%rsp),%rdi
  unpcklpd %xmm7,%xmm7
  unpcklpd %xmm6,%xmm6
  unpcklpd %xmm8,%xmm8
  unpcklpd %xmm5,%xmm5
  unpcklpd %xmm4,%xmm4
  movaps %xmm1,-0x68(%rsp)
  lea    (%r11,%rdi,1),%r8
  unpcklpd %xmm3,%xmm3
  xor    %edi,%edi
  nopw   0x0(%rax,%rax,1)
L69:
  movupd (%r11,%rdi,1),%xmm1
  movupd (%rax,%rdi,1),%xmm2
  mulpd  %xmm8,%xmm1
  mulpd  %xmm7,%xmm2
  addpd  %xmm1,%xmm2
  movupd (%rdx,%rdi,1),%xmm1
  mulpd  %xmm6,%xmm1
  addpd  %xmm2,%xmm1
  movupd (%rsi,%rdi,1),%xmm2
  mulpd  %xmm5,%xmm2
  addpd  %xmm1,%xmm2
  movupd (%r10,%rdi,1),%xmm1
  mulpd  %xmm4,%xmm1
  addpd  %xmm2,%xmm1
  movupd (%rcx,%rdi,1),%xmm2
  mulpd  %xmm3,%xmm2
  addpd  %xmm1,%xmm2
  movupd (%r9,%rdi,1),%xmm1
  mulpd  -0x78(%rsp),%xmm1
  addpd  %xmm2,%xmm1
  movupd (%r8,%rdi,1),%xmm2
  mulpd  -0x68(%rsp),%xmm2
  addpd  %xmm2,%xmm1
  movupd (%r15,%rdi,1),%xmm2
  addpd  %xmm2,%xmm1
  movups %xmm1,(%r15,%rdi,1)
  add    $0x10,%rdi
  cmp    %r13,%rdi
  jne    L69
  mov    -0x40(%rsp),%r8
  mov    -0x30(%rsp),%r9
  add    %r12,%rax
  add    %r12,%rdx
  mov    -0x38(%rsp),%r10
  mov    %r14,-0x78(%rsp)
  add    %r12,%rsi
  add    %r12,%rcx
  mov    0x38(%rsp),%r14d
  lea    (%r11,%r12,1),%rdi
  add    %r12,%r8
  add    %r12,%r9
  add    %r12,%r10
  cmp    %r14d,-0x44(%rsp)
  je     L88
  mulsd  (%rdi),%xmm0
  mulsd  (%rax),%xmm9
  mulsd  (%rdx),%xmm10
  mulsd  (%rsi),%xmm11
  mulsd  (%r8),%xmm12
  mulsd  (%rcx),%xmm13
  addsd  %xmm9,%xmm0
  mulsd  (%r9),%xmm14
  mulsd  (%r10),%xmm15
  addsd  %xmm10,%xmm0
  addsd  %xmm0,%xmm11
  addsd  %xmm11,%xmm12
  addsd  %xmm12,%xmm13
  addsd  %xmm13,%xmm14
  addsd  %xmm15,%xmm14
  addsd  (%rbx),%xmm14
  movsd  %xmm14,(%rbx)
L88:
  mov    -0x28(%rsp),%rsi
  add    $0x40,%rbp
  add    %rsi,-0x50(%rsp)
  add    %rsi,%r11
  cmp    %rbp,-0x20(%rsp)
  jne    L97
  mov    0x58(%rsp),%rax
  mov    0x60(%rsp),%r12
  mov    -0x44(%rsp),%r14d
  add    $0x1,%rax
  imul   %rsi,%rax
  add    %rax,%r12
  mov    0x54(%rsp),%eax
  lea    0x8(,%rax,8),%eax
  mov    %eax,-0x44(%rsp)
  mov    %eax,%esi
L167:
  mov    0x3c(%rsp),%ecx
  lea    -0x3(%rcx),%eax
  cmp    %esi,%eax
  jle    L133
  lea    -0x4(%rcx),%edx
  mov    0x40(%rsp),%r11
  movslq 0x50(%rsp),%r10
  movslq %esi,%rax
  sub    %esi,%edx
  mov    %r12,-0x20(%rsp)
  shr    $0x2,%edx
  lea    (%r11,%rax,8),%r9
  lea    0x0(,%r10,8),%rdi
  mov    %edx,%esi
  mov    %edx,-0x30(%rsp)
  mov    %rdi,%rdx
  lea    0x0(,%r10,4),%ebx
  lea    (%rax,%rsi,4),%rax
  shl    $0x4,%r10
  movslq %ebx,%rbx
  mov    %rsi,-0x28(%rsp)
  lea    0x20(%r11,%rax,8),%rax
  add    %r12,%r10
  mov    %r12,%rsi
  shl    $0x3,%rbx
  mov    %rax,-0x68(%rsp)
  lea    0x8(%rdi),%rax
  mov    %r10,%r8
  mov    %rdx,%r12
  mov    %rax,-0x78(%rsp)
  mov    %r14d,%eax
  shr    %eax
  lea    -0x1(%rax),%r11d
  mov    %r14d,%eax
  and    $0xfffffffe,%eax
  add    $0x1,%r11
  mov    %eax,%ebp
  mov    %eax,-0x50(%rsp)
  cltq
  shl    $0x4,%r11
  lea    (%r15,%rax,8),%rdi
  lea    -0x1(%r14),%eax
  shl    $0x3,%rbp
  mov    %rax,-0x38(%rsp)
  xchg   %ax,%ax
L30:
  movsd  (%r9),%xmm3
  movsd  0x8(%r9),%xmm1
  lea    (%r12,%rsi,1),%rdx
  lea    (%r12,%r10,1),%rcx
  movsd  0x10(%r9),%xmm4
  movsd  0x18(%r9),%xmm5
  test   %r14d,%r14d
  jle    L105
  lea    0x8(%r8),%rax
  cmp    %rax,%r15
  setne  %al
  cmp    $0x1,%r14d
  setne  %r13b
  and    %r13d,%eax
  mov    -0x78(%rsp),%r13
  add    %r10,%r13
  cmp    %r13,%r15
  setne  %r13b
  and    %r13d,%eax
  lea    0x8(%rsi),%r13
  cmp    %r13,%r15
  setne  %r13b
  test   %r13b,%al
  je     L263
  mov    -0x78(%rsp),%r13
  lea    0x0(%r13,%rsi,1),%rax
  cmp    %rax,%r15
  je     L263
  movapd %xmm3,%xmm9
  movapd %xmm1,%xmm8
  movapd %xmm4,%xmm7
  xor    %eax,%eax
  movapd %xmm5,%xmm6
  unpcklpd %xmm9,%xmm9
  unpcklpd %xmm8,%xmm8
  unpcklpd %xmm7,%xmm7
  unpcklpd %xmm6,%xmm6
  nopl   0x0(%rax)
L212:
  movupd (%rdx,%rax,1),%xmm0
  movupd (%rsi,%rax,1),%xmm2
  mulpd  %xmm8,%xmm0
  mulpd  %xmm9,%xmm2
  addpd  %xmm2,%xmm0
  movupd (%r8,%rax,1),%xmm2
  mulpd  %xmm7,%xmm2
  addpd  %xmm2,%xmm0
  movupd (%rcx,%rax,1),%xmm2
  mulpd  %xmm6,%xmm2
  addpd  %xmm2,%xmm0
  movupd (%r15,%rax,1),%xmm2
  addpd  %xmm2,%xmm0
  movups %xmm0,(%r15,%rax,1)
  add    $0x10,%rax
  cmp    %rax,%r11
  jne    L212
  lea    (%rsi,%rbp,1),%r13
  add    %rbp,%rdx
  lea    (%r10,%rbp,1),%rax
  add    %rbp,%rcx
  cmp    %r14d,-0x50(%rsp)
  je     L105
  mulsd  (%rdx),%xmm1
  mulsd  0x0(%r13),%xmm3
  mulsd  (%rax),%xmm4
  mulsd  (%rcx),%xmm5
  movapd %xmm1,%xmm0
  addsd  %xmm3,%xmm0
  addsd  %xmm4,%xmm0
  addsd  %xmm5,%xmm0
  addsd  (%rdi),%xmm0
  movsd  %xmm0,(%rdi)
L105:
  add    %rbx,%rsi
  add    $0x20,%r9
  add    %rbx,%r10
  add    %rbx,%r8
  cmp    -0x68(%rsp),%r9
  jne    L30
  mov    -0x28(%rsp),%rax
  mov    -0x20(%rsp),%r12
  add    $0x1,%rax
  imul   %rbx,%rax
  mov    -0x30(%rsp),%ebx
  add    %rax,%r12
  mov    -0x44(%rsp),%eax
  lea    0x4(%rax,%rbx,4),%eax
  mov    %eax,-0x44(%rsp)
L133:
  mov    0x3c(%rsp),%r11d
  mov    -0x44(%rsp),%eax
  cmp    %eax,%r11d
  jle    L268
  movslq 0x50(%rsp),%rdi
  shl    $0x3,%rdi
  test   %r14d,%r14d
  jle    L268
  movslq %eax,%rsi
  mov    %r14d,%r10d
  mov    %r14d,%eax
  mov    0x40(%rsp),%rbx
  shr    %eax
  and    $0xfffffffe,%r10d
  movslq %r14d,%r8
  lea    -0x1(%rax),%ecx
  mov    %r10d,%r9d
  add    $0x1,%rcx
  shl    $0x3,%r9
  shl    $0x4,%rcx
  lea    (%r15,%r9,1),%rdx
L251:
  lea    0x8(%r12),%rax
  movsd  (%rbx,%rsi,8),%xmm1
  cmp    %rax,%r15
  je     L123
  cmp    $0x1,%r14d
  je     L123
  movapd %xmm1,%xmm2
  xor    %eax,%eax
  unpcklpd %xmm2,%xmm2
  nop
L14:
  movupd (%r12,%rax,1),%xmm0
  movupd (%r15,%rax,1),%xmm6
  mulpd  %xmm2,%xmm0
  addpd  %xmm6,%xmm0
  movups %xmm0,(%r15,%rax,1)
  add    $0x10,%rax
  cmp    %rax,%rcx
  jne    L14
  lea    (%r12,%r9,1),%rax
  cmp    %r14d,%r10d
  je     L102
  movsd  (%rax),%xmm0
  mulsd  %xmm1,%xmm0
  addsd  (%rdx),%xmm0
  movsd  %xmm0,(%rdx)
L102:
  add    $0x1,%rsi
  add    %rdi,%r12
  cmp    %esi,%r11d
  jg     L251
L268:
  add    $0x70,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  cs nopw 0x0(%rax,%rax,1)
L204:
  mov    %rbx,-0x68(%rsp)
  mov    -0x78(%rsp),%r14
  xor    %edi,%edi
  mov    -0x40(%rsp),%r9
  mov    -0x38(%rsp),%r10
  mov    -0x30(%rsp),%r13
  mov    0x48(%rsp),%rbx
L220:
  movsd  (%r11,%rdi,8),%xmm1
  movsd  (%rax,%rdi,8),%xmm2
  mov    %rdi,%r8
  mulsd  %xmm9,%xmm2
  mulsd  %xmm0,%xmm1
  addsd  %xmm2,%xmm1
  movsd  (%rdx,%rdi,8),%xmm2
  mulsd  %xmm10,%xmm2
  addsd  %xmm2,%xmm1
  movsd  (%rsi,%rdi,8),%xmm2
  mulsd  %xmm11,%xmm2
  addsd  %xmm2,%xmm1
  movsd  (%r9,%rdi,8),%xmm2
  mulsd  %xmm12,%xmm2
  addsd  %xmm2,%xmm1
  movsd  (%rcx,%rdi,8),%xmm2
  mulsd  %xmm13,%xmm2
  addsd  %xmm2,%xmm1
  movsd  0x0(%r13,%rdi,8),%xmm2
  mulsd  %xmm14,%xmm2
  addsd  %xmm2,%xmm1
  movsd  (%r10,%rdi,8),%xmm2
  mulsd  %xmm15,%xmm2
  addsd  %xmm2,%xmm1
  addsd  (%r15,%rdi,8),%xmm1
  movsd  %xmm1,(%r15,%rdi,8)
  add    $0x1,%rdi
  cmp    %rbx,%r8
  jne    L220
  mov    %r14,-0x78(%rsp)
  mov    -0x68(%rsp),%rbx
  jmp    L88
  nopl   0x0(%rax,%rax,1)
L263:
  mov    %rdi,-0x40(%rsp)
  mov    -0x38(%rsp),%rdi
  xor    %eax,%eax
  nopl   0x0(%rax)
L122:
  movsd  (%rdx,%rax,8),%xmm0
  movsd  (%rsi,%rax,8),%xmm2
  mov    %rax,%r13
  mulsd  %xmm3,%xmm2
  mulsd  %xmm1,%xmm0
  addsd  %xmm2,%xmm0
  movsd  (%r10,%rax,8),%xmm2
  mulsd  %xmm4,%xmm2
  addsd  %xmm2,%xmm0
  movsd  (%rcx,%rax,8),%xmm2
  mulsd  %xmm5,%xmm2
  addsd  %xmm2,%xmm0
  addsd  (%r15,%rax,8),%xmm0
  movsd  %xmm0,(%r15,%rax,8)
  add    $0x1,%rax
  cmp    %rdi,%r13
  jne    L122
  mov    -0x40(%rsp),%rdi
  jmp    L105
L123:
  xor    %eax,%eax
  nopl   (%rax)
L259:
  movsd  (%r12,%rax,8),%xmm0
  mulsd  %xmm1,%xmm0
  addsd  (%r15,%rax,8),%xmm0
  movsd  %xmm0,(%r15,%rax,8)
  add    $0x1,%rax
  cmp    %rax,%r8
  jne    L259
  jmp    L102
L161:
  movl   $0x0,-0x44(%rsp)
  mov    -0x44(%rsp),%esi
  jmp    L167
```

assistant: ```c
void smatvec(ldm, nrow, ncol, M, vec, Mxvec) int ldm;
int nrow;
int ncol;
double *M;
double *vec;
double *Mxvec;
{
  double vi0, vi1, vi2, vi3, vi4, vi5, vi6, vi7;
  double *M0;
  register double *Mki0, *Mki1, *Mki2, *Mki3, *Mki4, *Mki5, *Mki6, *Mki7;
  register int firstcol = 0;
  int k;
  M0 = &M[0];
  while (firstcol < ncol - 7) {
    Mki0 = M0;
    Mki1 = Mki0 + ldm;
    Mki2 = Mki1 + ldm;
    Mki3 = Mki2 + ldm;
    Mki4 = Mki3 + ldm;
    Mki5 = Mki4 + ldm;
    Mki6 = Mki5 + ldm;
    Mki7 = Mki6 + ldm;
    vi0 = vec[firstcol++];
    vi1 = vec[firstcol++];
    vi2 = vec[firstcol++];
    vi3 = vec[firstcol++];
    vi4 = vec[firstcol++];
    vi5 = vec[firstcol++];
    vi6 = vec[firstcol++];
    vi7 = vec[firstcol++];
    for (k = 0; k < nrow; k++)
      Mxvec[k] += vi0 * *Mki0++ + vi1 * *Mki1++ + vi2 * *Mki2++ + vi3 * *Mki3++ + vi4 * *Mki4++ + vi5 * *Mki5++ + vi6 * *Mki6++ + vi7 * *Mki7++;
    M0 += 8 * ldm;
  }
  while (firstcol < ncol - 3) {
    Mki0 = M0;
    Mki1 = Mki0 + ldm;
    Mki2 = Mki1 + ldm;
    Mki3 = Mki2 + ldm;
    vi0 = vec[firstcol++];
    vi1 = vec[firstcol++];
    vi2 = vec[firstcol++];
    vi3 = vec[firstcol++];
    for (k = 0; k < nrow; k++)
      Mxvec[k] += vi0 * *Mki0++ + vi1 * *Mki1++ + vi2 * *Mki2++ + vi3 * *Mki3++;
    M0 += 4 * ldm;
  }
  while (firstcol < ncol) {
    Mki0 = M0;
    vi0 = vec[firstcol++];
    for (k = 0; k < nrow; k++)
      Mxvec[k] += vi0 * *Mki0++;
    M0 += ldm;
  }
}
```