user: Demonstrate the C code that generates the assembly output below:

```asm
<kernel_strmv_u_n_4_lib4>:
  endbr64
  test   %edi,%edi
  jle    L81
  push   %rbx
  mov    %edi,%r9d
  mov    %rcx,%r10
  movss  0x4(%rdx),%xmm1
  movss  0x8(%rdx),%xmm0
  movss  0xc(%rdx),%xmm8
  movss  (%rsi),%xmm2
  mulss  (%rdx),%xmm2
  pxor   %xmm3,%xmm3
  addss  %xmm3,%xmm2
  movaps %xmm1,%xmm4
  mulss  0x10(%rsi),%xmm4
  addss  %xmm4,%xmm2
  mulss  0x14(%rsi),%xmm1
  addss  %xmm3,%xmm1
  movaps %xmm0,%xmm4
  mulss  0x20(%rsi),%xmm4
  addss  %xmm2,%xmm4
  movaps %xmm0,%xmm2
  mulss  0x24(%rsi),%xmm2
  addss  %xmm2,%xmm1
  mulss  0x28(%rsi),%xmm0
  addss  %xmm3,%xmm0
  movaps %xmm8,%xmm6
  mulss  0x30(%rsi),%xmm6
  addss  %xmm4,%xmm6
  movaps %xmm8,%xmm5
  mulss  0x34(%rsi),%xmm5
  addss  %xmm1,%xmm5
  movaps %xmm8,%xmm4
  mulss  0x38(%rsi),%xmm4
  addss  %xmm0,%xmm4
  mulss  0x3c(%rsi),%xmm8
  addss  %xmm3,%xmm8
  lea    0x40(%rsi),%rdi
  lea    0x10(%rdx),%rcx
  cmp    $0x7,%r9d
  jle    L1
  lea    -0x8(%r9),%ebx
  shr    $0x2,%ebx
  mov    %ebx,%r11d
  lea    0x2(%r11),%rax
  shl    $0x6,%rax
  add    %rax,%rsi
  mov    %rcx,%rdx
  mov    %rdi,%rax
L32:
  movss  (%rdx),%xmm2
  movss  0x4(%rdx),%xmm1
  movss  0x8(%rdx),%xmm0
  movss  0xc(%rdx),%xmm3
  movaps %xmm2,%xmm7
  mulss  (%rax),%xmm7
  addss  %xmm6,%xmm7
  movaps %xmm2,%xmm6
  mulss  0x4(%rax),%xmm6
  addss  %xmm5,%xmm6
  movaps %xmm2,%xmm5
  mulss  0x8(%rax),%xmm5
  addss  %xmm4,%xmm5
  mulss  0xc(%rax),%xmm2
  addss  %xmm8,%xmm2
  movaps %xmm1,%xmm4
  mulss  0x10(%rax),%xmm4
  addss  %xmm7,%xmm4
  movaps %xmm1,%xmm7
  mulss  0x14(%rax),%xmm7
  addss  %xmm6,%xmm7
  movaps %xmm1,%xmm6
  mulss  0x18(%rax),%xmm6
  addss  %xmm5,%xmm6
  mulss  0x1c(%rax),%xmm1
  addss  %xmm2,%xmm1
  movaps %xmm0,%xmm5
  mulss  0x20(%rax),%xmm5
  addss  %xmm4,%xmm5
  movaps %xmm0,%xmm4
  mulss  0x24(%rax),%xmm4
  addss  %xmm7,%xmm4
  movaps %xmm0,%xmm2
  mulss  0x28(%rax),%xmm2
  addss  %xmm6,%xmm2
  mulss  0x2c(%rax),%xmm0
  addss  %xmm1,%xmm0
  movaps %xmm3,%xmm6
  mulss  0x30(%rax),%xmm6
  addss  %xmm5,%xmm6
  movaps %xmm3,%xmm5
  mulss  0x34(%rax),%xmm5
  addss  %xmm4,%xmm5
  movaps %xmm3,%xmm4
  mulss  0x38(%rax),%xmm4
  addss  %xmm2,%xmm4
  mulss  0x3c(%rax),%xmm3
  addss  %xmm0,%xmm3
  movaps %xmm3,%xmm8
  add    $0x40,%rax
  add    $0x10,%rdx
  cmp    %rsi,%rax
  jne    L32
  lea    0x1(%r11),%rax
  mov    %rax,%rdx
  shl    $0x6,%rdx
  add    %rdx,%rdi
  shl    $0x4,%rax
  add    %rax,%rcx
  lea    0x8(,%rbx,4),%edx
L3:
  cmp    %edx,%r9d
  jle    L62
  lea    -0x1(%r9),%eax
  sub    %edx,%eax
  lea    0x4(%rcx,%rax,4),%rax
L74:
  movss  (%rcx),%xmm0
  movaps %xmm0,%xmm1
  mulss  (%rdi),%xmm1
  addss  %xmm1,%xmm6
  movaps %xmm0,%xmm1
  mulss  0x4(%rdi),%xmm1
  addss  %xmm1,%xmm5
  movaps %xmm0,%xmm1
  mulss  0x8(%rdi),%xmm1
  addss  %xmm1,%xmm4
  mulss  0xc(%rdi),%xmm0
  addss  %xmm0,%xmm8
  add    $0x10,%rdi
  add    $0x4,%rcx
  cmp    %rax,%rcx
  jne    L74
L62:
  test   %r8d,%r8d
  jne    L80
  movss  %xmm6,(%r10)
  movss  %xmm5,0x4(%r10)
  movss  %xmm4,0x8(%r10)
  movss  %xmm8,0xc(%r10)
L50:
  pop    %rbx
  ret
L1:
  mov    $0x4,%edx
  jmp    L3
L80:
  cmp    $0x1,%r8d
  je     L14
  movss  (%r10),%xmm0
  subss  %xmm6,%xmm0
  movss  %xmm0,(%r10)
  movss  0x4(%r10),%xmm0
  subss  %xmm5,%xmm0
  movss  %xmm0,0x4(%r10)
  movss  0x8(%r10),%xmm0
  subss  %xmm4,%xmm0
  movss  %xmm0,0x8(%r10)
  movss  0xc(%r10),%xmm0
  subss  %xmm8,%xmm0
  movss  %xmm0,0xc(%r10)
  jmp    L50
L14:
  addss  (%r10),%xmm6
  movss  %xmm6,(%r10)
  addss  0x4(%r10),%xmm5
  movss  %xmm5,0x4(%r10)
  addss  0x8(%r10),%xmm4
  movss  %xmm4,0x8(%r10)
  addss  0xc(%r10),%xmm8
  movss  %xmm8,0xc(%r10)
  jmp    L50
L81:
  ret
```

assistant: ```c
void kernel_strmv_u_n_4_lib4(int kmax, float *A, float *x, float *y, int alg) {
  if (kmax <= 0)
    return;
  const int lda = 4;
  int k;
  float x_0, x_1, x_2, x_3, y_0 = 0, y_1 = 0, y_2 = 0, y_3 = 0;
  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_0 += A[0 + lda * 1] * x_1;
  y_1 += A[1 + lda * 1] * x_1;
  y_0 += A[0 + lda * 2] * x_2;
  y_1 += A[1 + lda * 2] * x_2;
  y_2 += A[2 + lda * 2] * x_2;
  y_0 += A[0 + lda * 3] * x_3;
  y_1 += A[1 + lda * 3] * x_3;
  y_2 += A[2 + lda * 3] * x_3;
  y_3 += A[3 + lda * 3] * x_3;
  A += 4 * lda;
  x += 4;
  k = 4;
  for (; k < kmax - 3; k += 4) {
    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[1 + lda * 0] * x_0;
    y_2 += A[2 + lda * 0] * x_0;
    y_3 += A[3 + lda * 0] * x_0;
    y_0 += A[0 + lda * 1] * x_1;
    y_1 += A[1 + lda * 1] * x_1;
    y_2 += A[2 + lda * 1] * x_1;
    y_3 += A[3 + lda * 1] * x_1;
    y_0 += A[0 + lda * 2] * x_2;
    y_1 += A[1 + lda * 2] * x_2;
    y_2 += A[2 + lda * 2] * x_2;
    y_3 += A[3 + lda * 2] * x_2;
    y_0 += A[0 + lda * 3] * x_3;
    y_1 += A[1 + lda * 3] * x_3;
    y_2 += A[2 + lda * 3] * x_3;
    y_3 += A[3 + lda * 3] * x_3;
    A += 4 * lda;
    x += 4;
  }
  for (; k < kmax; k++) {
    x_0 = x[0];
    y_0 += A[0 + lda * 0] * x_0;
    y_1 += A[1 + lda * 0] * x_0;
    y_2 += A[2 + lda * 0] * x_0;
    y_3 += A[3 + lda * 0] * x_0;
    A += 1 * lda;
    x += 1;
  }
  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;
  }
}
```