user: 请从给定的汇编指令推导出C源代码:

```asm
<kernel_strmv_u_t_4_lib8>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %edi,-0x34(%rbp)
  mov    %rsi,-0x40(%rbp)
  mov    %edx,-0x38(%rbp)
  mov    %rcx,-0x48(%rbp)
  mov    %r8,-0x50(%rbp)
  mov    %r9d,-0x54(%rbp)
  movl   $0x8,-0x18(%rbp)
  movl   $0x8,-0x14(%rbp)
  pxor   %xmm0,%xmm0
  movss  %xmm0,-0x28(%rbp)
  pxor   %xmm0,%xmm0
  movss  %xmm0,-0x24(%rbp)
  pxor   %xmm0,%xmm0
  movss  %xmm0,-0x20(%rbp)
  pxor   %xmm0,%xmm0
  movss  %xmm0,-0x1c(%rbp)
  movl   $0x0,-0x2c(%rbp)
  jmp    L43
L45:
  mov    -0x48(%rbp),%rax
  movss  (%rax),%xmm0
  movss  %xmm0,-0x10(%rbp)
  mov    -0x48(%rbp),%rax
  movss  0x4(%rax),%xmm0
  movss  %xmm0,-0xc(%rbp)
  mov    -0x48(%rbp),%rax
  movss  0x8(%rax),%xmm0
  movss  %xmm0,-0x8(%rbp)
  mov    -0x48(%rbp),%rax
  movss  0xc(%rax),%xmm0
  movss  %xmm0,-0x4(%rbp)
  mov    -0x40(%rbp),%rax
  movss  (%rax),%xmm0
  mulss  -0x10(%rbp),%xmm0
  movss  -0x28(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x28(%rbp)
  mov    -0x18(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x10(%rbp),%xmm0
  movss  -0x24(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x24(%rbp)
  mov    -0x18(%rbp),%eax
  add    %eax,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x10(%rbp),%xmm0
  movss  -0x20(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x20(%rbp)
  mov    -0x18(%rbp),%edx
  mov    %edx,%eax
  add    %eax,%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x10(%rbp),%xmm0
  movss  -0x1c(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x1c(%rbp)
  mov    -0x40(%rbp),%rax
  add    $0x4,%rax
  movss  (%rax),%xmm0
  mulss  -0xc(%rbp),%xmm0
  movss  -0x28(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x28(%rbp)
  mov    -0x18(%rbp),%eax
  add    $0x1,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0xc(%rbp),%xmm0
  movss  -0x24(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x24(%rbp)
  mov    -0x18(%rbp),%eax
  add    %eax,%eax
  add    $0x1,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0xc(%rbp),%xmm0
  movss  -0x20(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x20(%rbp)
  mov    -0x18(%rbp),%edx
  mov    %edx,%eax
  add    %eax,%eax
  add    %edx,%eax
  add    $0x1,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0xc(%rbp),%xmm0
  movss  -0x1c(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x1c(%rbp)
  mov    -0x40(%rbp),%rax
  add    $0x8,%rax
  movss  (%rax),%xmm0
  mulss  -0x8(%rbp),%xmm0
  movss  -0x28(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x28(%rbp)
  mov    -0x18(%rbp),%eax
  add    $0x2,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x8(%rbp),%xmm0
  movss  -0x24(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x24(%rbp)
  mov    -0x18(%rbp),%eax
  add    $0x1,%eax
  add    %eax,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x8(%rbp),%xmm0
  movss  -0x20(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x20(%rbp)
  mov    -0x18(%rbp),%edx
  mov    %edx,%eax
  add    %eax,%eax
  add    %edx,%eax
  add    $0x2,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x8(%rbp),%xmm0
  movss  -0x1c(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x1c(%rbp)
  mov    -0x40(%rbp),%rax
  add    $0xc,%rax
  movss  (%rax),%xmm0
  mulss  -0x4(%rbp),%xmm0
  movss  -0x28(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x28(%rbp)
  mov    -0x18(%rbp),%eax
  add    $0x3,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x4(%rbp),%xmm0
  movss  -0x24(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x24(%rbp)
  mov    -0x18(%rbp),%eax
  add    %eax,%eax
  add    $0x3,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x4(%rbp),%xmm0
  movss  -0x20(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x20(%rbp)
  mov    -0x18(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,%eax
  add    %eax,%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x4(%rbp),%xmm0
  movss  -0x1c(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x1c(%rbp)
  mov    -0x48(%rbp),%rax
  movss  0x10(%rax),%xmm0
  movss  %xmm0,-0x10(%rbp)
  mov    -0x48(%rbp),%rax
  movss  0x14(%rax),%xmm0
  movss  %xmm0,-0xc(%rbp)
  mov    -0x48(%rbp),%rax
  movss  0x18(%rax),%xmm0
  movss  %xmm0,-0x8(%rbp)
  mov    -0x48(%rbp),%rax
  movss  0x1c(%rax),%xmm0
  movss  %xmm0,-0x4(%rbp)
  mov    -0x40(%rbp),%rax
  add    $0x10,%rax
  movss  (%rax),%xmm0
  mulss  -0x10(%rbp),%xmm0
  movss  -0x28(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x28(%rbp)
  mov    -0x18(%rbp),%eax
  add    $0x4,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x10(%rbp),%xmm0
  movss  -0x24(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x24(%rbp)
  mov    -0x18(%rbp),%eax
  add    $0x2,%eax
  add    %eax,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x10(%rbp),%xmm0
  movss  -0x20(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x20(%rbp)
  mov    -0x18(%rbp),%edx
  mov    %edx,%eax
  add    %eax,%eax
  add    %edx,%eax
  add    $0x4,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x10(%rbp),%xmm0
  movss  -0x1c(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x1c(%rbp)
  mov    -0x40(%rbp),%rax
  add    $0x14,%rax
  movss  (%rax),%xmm0
  mulss  -0xc(%rbp),%xmm0
  movss  -0x28(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x28(%rbp)
  mov    -0x18(%rbp),%eax
  add    $0x5,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0xc(%rbp),%xmm0
  movss  -0x24(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x24(%rbp)
  mov    -0x18(%rbp),%eax
  add    %eax,%eax
  add    $0x5,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0xc(%rbp),%xmm0
  movss  -0x20(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x20(%rbp)
  mov    -0x18(%rbp),%edx
  mov    %edx,%eax
  add    %eax,%eax
  add    %edx,%eax
  add    $0x5,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0xc(%rbp),%xmm0
  movss  -0x1c(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x1c(%rbp)
  mov    -0x40(%rbp),%rax
  add    $0x18,%rax
  movss  (%rax),%xmm0
  mulss  -0x8(%rbp),%xmm0
  movss  -0x28(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x28(%rbp)
  mov    -0x18(%rbp),%eax
  add    $0x6,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x8(%rbp),%xmm0
  movss  -0x24(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x24(%rbp)
  mov    -0x18(%rbp),%eax
  add    $0x3,%eax
  add    %eax,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x8(%rbp),%xmm0
  movss  -0x20(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x20(%rbp)
  mov    -0x18(%rbp),%edx
  mov    %edx,%eax
  add    %eax,%eax
  add    %edx,%eax
  add    $0x6,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x8(%rbp),%xmm0
  movss  -0x1c(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x1c(%rbp)
  mov    -0x40(%rbp),%rax
  add    $0x1c,%rax
  movss  (%rax),%xmm0
  mulss  -0x4(%rbp),%xmm0
  movss  -0x28(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x28(%rbp)
  mov    -0x18(%rbp),%eax
  add    $0x7,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x4(%rbp),%xmm0
  movss  -0x24(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x24(%rbp)
  mov    -0x18(%rbp),%eax
  add    %eax,%eax
  add    $0x7,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x4(%rbp),%xmm0
  movss  -0x20(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x20(%rbp)
  mov    -0x18(%rbp),%edx
  mov    %edx,%eax
  add    %eax,%eax
  add    %edx,%eax
  add    $0x7,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x4(%rbp),%xmm0
  movss  -0x1c(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x1c(%rbp)
  mov    -0x38(%rbp),%eax
  imul   -0x14(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rax,-0x40(%rbp)
  addq   $0x20,-0x48(%rbp)
  addl   $0x8,-0x2c(%rbp)
L43:
  mov    -0x34(%rbp),%eax
  sub    $0x7,%eax
  cmp    %eax,-0x2c(%rbp)
  jl     L45
  mov    -0x48(%rbp),%rax
  movss  (%rax),%xmm0
  movss  %xmm0,-0x10(%rbp)
  mov    -0x48(%rbp),%rax
  movss  0x4(%rax),%xmm0
  movss  %xmm0,-0xc(%rbp)
  mov    -0x48(%rbp),%rax
  movss  0x8(%rax),%xmm0
  movss  %xmm0,-0x8(%rbp)
  mov    -0x48(%rbp),%rax
  movss  0xc(%rax),%xmm0
  movss  %xmm0,-0x4(%rbp)
  mov    -0x40(%rbp),%rax
  movss  (%rax),%xmm0
  mulss  -0x10(%rbp),%xmm0
  movss  -0x28(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x28(%rbp)
  mov    -0x18(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x10(%rbp),%xmm0
  movss  -0x24(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x24(%rbp)
  mov    -0x18(%rbp),%eax
  add    %eax,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x10(%rbp),%xmm0
  movss  -0x20(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x20(%rbp)
  mov    -0x18(%rbp),%edx
  mov    %edx,%eax
  add    %eax,%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x10(%rbp),%xmm0
  movss  -0x1c(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x1c(%rbp)
  mov    -0x18(%rbp),%eax
  add    $0x1,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0xc(%rbp),%xmm0
  movss  -0x24(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x24(%rbp)
  mov    -0x18(%rbp),%eax
  add    %eax,%eax
  add    $0x1,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0xc(%rbp),%xmm0
  movss  -0x20(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x20(%rbp)
  mov    -0x18(%rbp),%edx
  mov    %edx,%eax
  add    %eax,%eax
  add    %edx,%eax
  add    $0x1,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0xc(%rbp),%xmm0
  movss  -0x1c(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x1c(%rbp)
  mov    -0x18(%rbp),%eax
  add    $0x1,%eax
  add    %eax,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x8(%rbp),%xmm0
  movss  -0x20(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x20(%rbp)
  mov    -0x18(%rbp),%edx
  mov    %edx,%eax
  add    %eax,%eax
  add    %edx,%eax
  add    $0x2,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x8(%rbp),%xmm0
  movss  -0x1c(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x1c(%rbp)
  mov    -0x18(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,%eax
  add    %eax,%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  -0x4(%rbp),%xmm0
  movss  -0x1c(%rbp),%xmm1
  addss  %xmm1,%xmm0
  movss  %xmm0,-0x1c(%rbp)
  cmpl   $0x0,-0x54(%rbp)
  jne    L53
  mov    -0x50(%rbp),%rax
  movss  -0x28(%rbp),%xmm0
  movss  %xmm0,(%rax)
  mov    -0x50(%rbp),%rax
  add    $0x4,%rax
  movss  -0x24(%rbp),%xmm0
  movss  %xmm0,(%rax)
  mov    -0x50(%rbp),%rax
  add    $0x8,%rax
  movss  -0x20(%rbp),%xmm0
  movss  %xmm0,(%rax)
  mov    -0x50(%rbp),%rax
  add    $0xc,%rax
  movss  -0x1c(%rbp),%xmm0
  movss  %xmm0,(%rax)
  jmp    L52
L53:
  cmpl   $0x1,-0x54(%rbp)
  jne    L30
  mov    -0x50(%rbp),%rax
  movss  (%rax),%xmm0
  addss  -0x28(%rbp),%xmm0
  mov    -0x50(%rbp),%rax
  movss  %xmm0,(%rax)
  mov    -0x50(%rbp),%rax
  add    $0x4,%rax
  movss  (%rax),%xmm0
  mov    -0x50(%rbp),%rax
  add    $0x4,%rax
  addss  -0x24(%rbp),%xmm0
  movss  %xmm0,(%rax)
  mov    -0x50(%rbp),%rax
  add    $0x8,%rax
  movss  (%rax),%xmm0
  mov    -0x50(%rbp),%rax
  add    $0x8,%rax
  addss  -0x20(%rbp),%xmm0
  movss  %xmm0,(%rax)
  mov    -0x50(%rbp),%rax
  add    $0xc,%rax
  movss  (%rax),%xmm0
  mov    -0x50(%rbp),%rax
  add    $0xc,%rax
  addss  -0x1c(%rbp),%xmm0
  movss  %xmm0,(%rax)
  jmp    L52
L30:
  mov    -0x50(%rbp),%rax
  movss  (%rax),%xmm0
  subss  -0x28(%rbp),%xmm0
  mov    -0x50(%rbp),%rax
  movss  %xmm0,(%rax)
  mov    -0x50(%rbp),%rax
  add    $0x4,%rax
  movss  (%rax),%xmm0
  mov    -0x50(%rbp),%rax
  add    $0x4,%rax
  subss  -0x24(%rbp),%xmm0
  movss  %xmm0,(%rax)
  mov    -0x50(%rbp),%rax
  add    $0x8,%rax
  movss  (%rax),%xmm0
  mov    -0x50(%rbp),%rax
  add    $0x8,%rax
  subss  -0x20(%rbp),%xmm0
  movss  %xmm0,(%rax)
  mov    -0x50(%rbp),%rax
  add    $0xc,%rax
  movss  (%rax),%xmm0
  mov    -0x50(%rbp),%rax
  add    $0xc,%rax
  subss  -0x1c(%rbp),%xmm0
  movss  %xmm0,(%rax)
L52:
  nop
  pop    %rbp
  ret
```

assistant: ```c
void kernel_strmv_u_t_4_lib8(int kmax, float *A, int sda, float *x, float *y, int alg) {
  const int lda = 8;
  const int bs = 8;
  int k;
  float x_0, x_1, x_2, x_3, y_0 = 0, y_1 = 0, y_2 = 0, y_3 = 0;
  k = 0;
  for (; k < kmax - 7; k += 8) {
    x_0 = x[0];
    x_1 = x[1];
    x_2 = x[2];
    x_3 = x[3];
    y_0 += A[0 + lda * 0] * x_0;
    y_1 += A[0 + lda * 1] * x_0;
    y_2 += A[0 + lda * 2] * x_0;
    y_3 += A[0 + lda * 3] * x_0;
    y_0 += A[1 + lda * 0] * x_1;
    y_1 += A[1 + lda * 1] * x_1;
    y_2 += A[1 + lda * 2] * x_1;
    y_3 += A[1 + lda * 3] * x_1;
    y_0 += A[2 + lda * 0] * x_2;
    y_1 += A[2 + lda * 1] * x_2;
    y_2 += A[2 + lda * 2] * x_2;
    y_3 += A[2 + lda * 3] * x_2;
    y_0 += A[3 + lda * 0] * x_3;
    y_1 += A[3 + lda * 1] * x_3;
    y_2 += A[3 + lda * 2] * x_3;
    y_3 += A[3 + lda * 3] * x_3;
    x_0 = x[4];
    x_1 = x[5];
    x_2 = x[6];
    x_3 = x[7];
    y_0 += A[4 + lda * 0] * x_0;
    y_1 += A[4 + lda * 1] * x_0;
    y_2 += A[4 + lda * 2] * x_0;
    y_3 += A[4 + lda * 3] * x_0;
    y_0 += A[5 + lda * 0] * x_1;
    y_1 += A[5 + lda * 1] * x_1;
    y_2 += A[5 + lda * 2] * x_1;
    y_3 += A[5 + lda * 3] * x_1;
    y_0 += A[6 + lda * 0] * x_2;
    y_1 += A[6 + lda * 1] * x_2;
    y_2 += A[6 + lda * 2] * x_2;
    y_3 += A[6 + lda * 3] * x_2;
    y_0 += A[7 + lda * 0] * x_3;
    y_1 += A[7 + lda * 1] * x_3;
    y_2 += A[7 + lda * 2] * x_3;
    y_3 += A[7 + lda * 3] * x_3;
    A += sda * bs;
    x += 8;
  }
  x_0 = x[0];
  x_1 = x[1];
  x_2 = x[2];
  x_3 = x[3];
  y_0 += A[0 + lda * 0] * x_0;
  y_1 += A[0 + lda * 1] * x_0;
  y_2 += A[0 + lda * 2] * x_0;
  y_3 += A[0 + lda * 3] * x_0;
  y_1 += A[1 + lda * 1] * x_1;
  y_2 += A[1 + lda * 2] * x_1;
  y_3 += A[1 + lda * 3] * x_1;
  y_2 += A[2 + lda * 2] * x_2;
  y_3 += A[2 + lda * 3] * x_2;
  y_3 += A[3 + lda * 3] * x_3;
  if (alg == 0) {
    y[0] = y_0;
    y[1] = y_1;
    y[2] = y_2;
    y[3] = y_3;
  } else if (alg == 1) {
    y[0] += y_0;
    y[1] += y_1;
    y[2] += y_2;
    y[3] += y_3;
  } else {
    y[0] -= y_0;
    y[1] -= y_1;
    y[2] -= y_2;
    y[3] -= y_3;
  }
}
```