user: 下面的汇编指令对应的C源代码是什么:

```asm
<kernel_dtrmv_u_n_8_lib4>:
  endbr64
  test   %edi,%edi
  jle    L23
  push   %r12
  pxor   %xmm2,%xmm2
  shl    $0x2,%edx
  mov    %edi,%r10d
  push   %rbp
  movslq %edx,%rdx
  lea    0x100(%rsi),%r11
  push   %rbx
  movsd  (%rsi),%xmm4
  lea    (%rsi,%rdx,8),%rdi
  lea    0x40(%rcx),%rbx
  mulsd  (%rcx),%xmm4
  movsd  0x8(%rcx),%xmm1
  add    $0x100,%rdi
  movsd  0x20(%rsi),%xmm5
  movsd  0x10(%rcx),%xmm0
  movsd  0x18(%rcx),%xmm3
  movsd  0x60(%rsi),%xmm8
  mulsd  %xmm1,%xmm5
  movsd  0x70(%rsi),%xmm6
  movsd  0x68(%rsi),%xmm7
  mulsd  0x28(%rsi),%xmm1
  movsd  0x38(%rcx),%xmm11
  addsd  %xmm2,%xmm4
  mulsd  %xmm3,%xmm8
  movsd  0x88(%rsi),%xmm9
  mulsd  %xmm3,%xmm6
  mulsd  %xmm3,%xmm7
  addsd  %xmm5,%xmm4
  movsd  0x40(%rsi),%xmm5
  mulsd  0x78(%rsi),%xmm3
  addsd  %xmm2,%xmm1
  mulsd  %xmm0,%xmm5
  addsd  %xmm2,%xmm3
  addsd  %xmm4,%xmm5
  movsd  0x48(%rsi),%xmm4
  mulsd  %xmm0,%xmm4
  addsd  %xmm5,%xmm8
  movsd  0x80(%rsi),%xmm5
  mulsd  0x50(%rsi),%xmm0
  addsd  %xmm4,%xmm1
  movsd  0x20(%rcx),%xmm4
  addsd  %xmm2,%xmm0
  mulsd  %xmm4,%xmm5
  addsd  %xmm1,%xmm7
  movsd  0x28(%rcx),%xmm1
  mulsd  %xmm4,%xmm9
  addsd  %xmm0,%xmm6
  movsd  0x30(%rcx),%xmm0
  addsd  %xmm8,%xmm5
  movsd  0x90(%rsi),%xmm8
  addsd  %xmm7,%xmm9
  movsd  0x98(%rsi),%xmm7
  mulsd  %xmm4,%xmm8
  mulsd  %xmm4,%xmm7
  mulsd  -0x80(%rdi),%xmm4
  addsd  %xmm6,%xmm8
  movsd  0xa0(%rsi),%xmm6
  addsd  %xmm3,%xmm7
  movsd  0xb8(%rsi),%xmm3
  mulsd  %xmm1,%xmm6
  addsd  %xmm2,%xmm4
  mulsd  %xmm1,%xmm3
  addsd  %xmm5,%xmm6
  movsd  0xa8(%rsi),%xmm5
  addsd  %xmm7,%xmm3
  mulsd  %xmm1,%xmm5
  addsd  %xmm9,%xmm5
  movsd  0xb0(%rsi),%xmm9
  mulsd  %xmm1,%xmm9
  addsd  %xmm8,%xmm9
  movsd  -0x60(%rdi),%xmm8
  mulsd  %xmm1,%xmm8
  mulsd  -0x58(%rdi),%xmm1
  movsd  0xc0(%rsi),%xmm7
  movsd  0xe0(%rsi),%xmm10
  mulsd  %xmm0,%xmm7
  mulsd  %xmm11,%xmm10
  addsd  %xmm4,%xmm8
  movsd  0xd8(%rsi),%xmm4
  addsd  %xmm2,%xmm1
  mulsd  %xmm0,%xmm4
  addsd  %xmm6,%xmm7
  movsd  0xc8(%rsi),%xmm6
  mulsd  %xmm0,%xmm6
  addsd  %xmm7,%xmm10
  movsd  0xf8(%rsi),%xmm7
  addsd  %xmm3,%xmm4
  movsd  -0x40(%rdi),%xmm3
  mulsd  %xmm11,%xmm7
  mulsd  %xmm0,%xmm3
  addsd  %xmm5,%xmm6
  movsd  0xd0(%rsi),%xmm5
  mulsd  %xmm0,%xmm5
  addsd  %xmm4,%xmm7
  movsd  -0x10(%rdi),%xmm4
  addsd  %xmm8,%xmm3
  movsd  -0x38(%rdi),%xmm8
  mulsd  %xmm11,%xmm4
  mulsd  %xmm0,%xmm8
  addsd  %xmm9,%xmm5
  mulsd  -0x30(%rdi),%xmm0
  movsd  0xe8(%rsi),%xmm9
  mulsd  %xmm11,%xmm9
  addsd  %xmm8,%xmm1
  movsd  0xf0(%rsi),%xmm8
  addsd  %xmm2,%xmm0
  mulsd  %xmm11,%xmm8
  addsd  %xmm6,%xmm9
  movsd  -0x20(%rdi),%xmm6
  addsd  %xmm0,%xmm4
  mulsd  %xmm11,%xmm6
  addsd  %xmm5,%xmm8
  movsd  -0x18(%rdi),%xmm5
  mulsd  %xmm11,%xmm5
  mulsd  -0x8(%rdi),%xmm11
  addsd  %xmm3,%xmm6
  addsd  %xmm1,%xmm5
  addsd  %xmm2,%xmm11
  cmp    $0xb,%r10d
  jle    L60
  lea    -0xc(%r10),%r12d
  mov    %rbx,%rcx
  mov    %r11,%rax
  shr    $0x2,%r12d
  mov    %r12d,%ebp
  lea    0x3(%rbp),%rdx
  shl    $0x7,%rdx
  lea    (%rsi,%rdx,1),%rsi
  mov    %rdi,%rdx
  nopl   (%rax)
L10:
  movsd  (%rcx),%xmm2
  movsd  (%rax),%xmm12
  sub    $0xffffffffffffff80,%rax
  sub    $0xffffffffffffff80,%rdx
  movsd  0x8(%rcx),%xmm1
  movsd  -0x68(%rax),%xmm13
  add    $0x20,%rcx
  mulsd  %xmm2,%xmm12
  movsd  -0x10(%rcx),%xmm0
  movsd  -0x8(%rcx),%xmm3
  mulsd  %xmm2,%xmm13
  addsd  %xmm12,%xmm10
  movsd  -0x78(%rax),%xmm12
  addsd  %xmm7,%xmm13
  movsd  -0x78(%rdx),%xmm7
  mulsd  %xmm2,%xmm12
  mulsd  %xmm2,%xmm7
  addsd  %xmm12,%xmm9
  movsd  -0x70(%rax),%xmm12
  addsd  %xmm5,%xmm7
  movsd  -0x48(%rax),%xmm5
  mulsd  %xmm2,%xmm12
  mulsd  %xmm1,%xmm5
  addsd  %xmm8,%xmm12
  movsd  -0x80(%rdx),%xmm8
  addsd  %xmm13,%xmm5
  movsd  -0x40(%rax),%xmm13
  mulsd  %xmm2,%xmm8
  mulsd  %xmm0,%xmm13
  addsd  %xmm6,%xmm8
  movsd  -0x70(%rdx),%xmm6
  mulsd  %xmm2,%xmm6
  mulsd  -0x68(%rdx),%xmm2
  addsd  %xmm4,%xmm6
  movsd  -0x60(%rax),%xmm4
  addsd  %xmm11,%xmm2
  movsd  -0x58(%rax),%xmm11
  mulsd  %xmm1,%xmm4
  mulsd  %xmm1,%xmm11
  addsd  %xmm4,%xmm10
  movsd  -0x50(%rax),%xmm4
  addsd  %xmm9,%xmm11
  movsd  -0x58(%rdx),%xmm9
  mulsd  %xmm1,%xmm4
  mulsd  %xmm1,%xmm9
  addsd  %xmm10,%xmm13
  movsd  -0x20(%rax),%xmm10
  mulsd  %xmm3,%xmm10
  addsd  %xmm4,%xmm12
  movsd  -0x60(%rdx),%xmm4
  addsd  %xmm7,%xmm9
  movsd  -0x30(%rax),%xmm7
  mulsd  %xmm1,%xmm4
  mulsd  %xmm0,%xmm7
  addsd  %xmm13,%xmm10
  addsd  %xmm8,%xmm4
  movsd  -0x50(%rdx),%xmm8
  addsd  %xmm12,%xmm7
  mulsd  %xmm1,%xmm8
  mulsd  -0x48(%rdx),%xmm1
  addsd  %xmm6,%xmm8
  movsd  -0x28(%rax),%xmm6
  addsd  %xmm2,%xmm1
  movsd  -0x38(%rax),%xmm2
  mulsd  %xmm0,%xmm6
  mulsd  %xmm0,%xmm2
  addsd  %xmm5,%xmm6
  movsd  -0x40(%rdx),%xmm5
  addsd  %xmm2,%xmm11
  movsd  -0x30(%rdx),%xmm2
  mulsd  %xmm0,%xmm5
  mulsd  %xmm0,%xmm2
  addsd  %xmm4,%xmm5
  movsd  -0x38(%rdx),%xmm4
  addsd  %xmm8,%xmm2
  movsd  -0x10(%rax),%xmm8
  mulsd  %xmm0,%xmm4
  mulsd  %xmm3,%xmm8
  mulsd  -0x28(%rdx),%xmm0
  addsd  %xmm9,%xmm4
  movsd  -0x18(%rax),%xmm9
  addsd  %xmm7,%xmm8
  movsd  -0x8(%rax),%xmm7
  mulsd  %xmm3,%xmm9
  addsd  %xmm1,%xmm0
  mulsd  %xmm3,%xmm7
  addsd  %xmm11,%xmm9
  addsd  %xmm6,%xmm7
  movsd  -0x20(%rdx),%xmm6
  mulsd  %xmm3,%xmm6
  addsd  %xmm5,%xmm6
  movsd  -0x18(%rdx),%xmm5
  mulsd  %xmm3,%xmm5
  addsd  %xmm4,%xmm5
  movsd  -0x10(%rdx),%xmm4
  mulsd  %xmm3,%xmm4
  mulsd  -0x8(%rdx),%xmm3
  addsd  %xmm2,%xmm4
  addsd  %xmm0,%xmm3
  movapd %xmm3,%xmm11
  cmp    %rsi,%rax
  jne    L10
  lea    0x1(%rbp),%rax
  mov    %rax,%rdx
  shl    $0x5,%rax
  shl    $0x7,%rdx
  add    %rax,%rbx
  lea    0xc(,%r12,4),%eax
  add    %rdx,%r11
  add    %rdx,%rdi
L9:
  cmp    %eax,%r10d
  jle    L49
  sub    $0x1,%r10d
  sub    %eax,%r10d
  xor    %eax,%eax
  lea    0x8(,%r10,8),%rdx
L5:
  movsd  (%rbx,%rax,1),%xmm0
  movsd  (%r11,%rax,4),%xmm1
  mulsd  %xmm0,%xmm1
  addsd  %xmm1,%xmm10
  movsd  0x8(%r11,%rax,4),%xmm1
  mulsd  %xmm0,%xmm1
  addsd  %xmm1,%xmm9
  movsd  0x10(%r11,%rax,4),%xmm1
  mulsd  %xmm0,%xmm1
  addsd  %xmm1,%xmm8
  movsd  0x18(%r11,%rax,4),%xmm1
  mulsd  %xmm0,%xmm1
  addsd  %xmm1,%xmm7
  movsd  (%rdi,%rax,4),%xmm1
  mulsd  %xmm0,%xmm1
  addsd  %xmm1,%xmm6
  movsd  0x8(%rdi,%rax,4),%xmm1
  mulsd  %xmm0,%xmm1
  addsd  %xmm1,%xmm5
  movsd  0x10(%rdi,%rax,4),%xmm1
  mulsd  %xmm0,%xmm1
  mulsd  0x18(%rdi,%rax,4),%xmm0
  add    $0x8,%rax
  addsd  %xmm1,%xmm4
  addsd  %xmm0,%xmm11
  cmp    %rax,%rdx
  jne    L5
L49:
  test   %r9d,%r9d
  je     L7
  movsd  (%r8),%xmm15
  movsd  0x8(%r8),%xmm14
  movsd  0x10(%r8),%xmm13
  movsd  0x18(%r8),%xmm12
  movsd  0x20(%r8),%xmm3
  movsd  0x28(%r8),%xmm2
  movsd  0x30(%r8),%xmm1
  movsd  0x38(%r8),%xmm0
  cmp    $0x1,%r9d
  je     L72
  subsd  %xmm10,%xmm15
  subsd  %xmm9,%xmm14
  pop    %rbx
  pop    %rbp
  subsd  %xmm8,%xmm13
  subsd  %xmm7,%xmm12
  pop    %r12
  subsd  %xmm6,%xmm3
  subsd  %xmm5,%xmm2
  subsd  %xmm4,%xmm1
  subsd  %xmm11,%xmm0
  movsd  %xmm15,(%r8)
  movsd  %xmm14,0x8(%r8)
  movsd  %xmm13,0x10(%r8)
  movsd  %xmm12,0x18(%r8)
  movsd  %xmm3,0x20(%r8)
  movsd  %xmm2,0x28(%r8)
  movsd  %xmm1,0x30(%r8)
  movsd  %xmm0,0x38(%r8)
  ret
  xchg   %ax,%ax
L7:
  pop    %rbx
  movsd  %xmm10,(%r8)
  pop    %rbp
  movsd  %xmm9,0x8(%r8)
  pop    %r12
  movsd  %xmm8,0x10(%r8)
  movsd  %xmm7,0x18(%r8)
  movsd  %xmm6,0x20(%r8)
  movsd  %xmm5,0x28(%r8)
  movsd  %xmm4,0x30(%r8)
  movsd  %xmm11,0x38(%r8)
  ret
  nopl   0x0(%rax)
L23:
  ret
  nopl   0x0(%rax)
L72:
  addsd  %xmm10,%xmm15
  addsd  %xmm9,%xmm14
  pop    %rbx
  pop    %rbp
  addsd  %xmm8,%xmm13
  addsd  %xmm7,%xmm12
  pop    %r12
  addsd  %xmm6,%xmm3
  addsd  %xmm5,%xmm2
  addsd  %xmm4,%xmm1
  addsd  %xmm11,%xmm0
  movsd  %xmm15,(%r8)
  movsd  %xmm14,0x8(%r8)
  movsd  %xmm13,0x10(%r8)
  movsd  %xmm12,0x18(%r8)
  movsd  %xmm3,0x20(%r8)
  movsd  %xmm2,0x28(%r8)
  movsd  %xmm1,0x30(%r8)
  movsd  %xmm0,0x38(%r8)
  ret
  nopl   0x0(%rax)
L60:
  mov    $0x8,%eax
  jmp    L9
```

assistant: ```c
void kernel_dtrmv_u_n_8_lib4(int kmax, double *A0, int sda, double *x, double *y, int alg) {
  if (kmax <= 0)
    return;
  double *A1 = A0 + 4 * sda;
  const int lda = 4;
  int k;
  double x_0, x_1, x_2, x_3, y_0 = 0, y_1 = 0, y_2 = 0, y_3 = 0, y_4 = 0, y_5 = 0, y_6 = 0, y_7 = 0;
  x_0 = x[0];
  x_1 = x[1];
  x_2 = x[2];
  x_3 = x[3];
  y_0 += A0[0 + lda * 0] * x_0;
  y_0 += A0[0 + lda * 1] * x_1;
  y_1 += A0[1 + lda * 1] * x_1;
  y_0 += A0[0 + lda * 2] * x_2;
  y_1 += A0[1 + lda * 2] * x_2;
  y_2 += A0[2 + lda * 2] * x_2;
  y_0 += A0[0 + lda * 3] * x_3;
  y_1 += A0[1 + lda * 3] * x_3;
  y_2 += A0[2 + lda * 3] * x_3;
  y_3 += A0[3 + lda * 3] * x_3;
  A0 += 4 * lda;
  A1 += 4 * lda;
  x += 4;
  x_0 = x[0];
  x_1 = x[1];
  x_2 = x[2];
  x_3 = x[3];
  y_0 += A0[0 + lda * 0] * x_0;
  y_1 += A0[1 + lda * 0] * x_0;
  y_2 += A0[2 + lda * 0] * x_0;
  y_3 += A0[3 + lda * 0] * x_0;
  y_4 += A1[0 + lda * 0] * x_0;
  y_0 += A0[0 + lda * 1] * x_1;
  y_1 += A0[1 + lda * 1] * x_1;
  y_2 += A0[2 + lda * 1] * x_1;
  y_3 += A0[3 + lda * 1] * x_1;
  y_4 += A1[0 + lda * 1] * x_1;
  y_5 += A1[1 + lda * 1] * x_1;
  y_0 += A0[0 + lda * 2] * x_2;
  y_1 += A0[1 + lda * 2] * x_2;
  y_2 += A0[2 + lda * 2] * x_2;
  y_3 += A0[3 + lda * 2] * x_2;
  y_4 += A1[0 + lda * 2] * x_2;
  y_5 += A1[1 + lda * 2] * x_2;
  y_6 += A1[2 + lda * 2] * x_2;
  y_0 += A0[0 + lda * 3] * x_3;
  y_1 += A0[1 + lda * 3] * x_3;
  y_2 += A0[2 + lda * 3] * x_3;
  y_3 += A0[3 + lda * 3] * x_3;
  y_4 += A1[0 + lda * 3] * x_3;
  y_5 += A1[1 + lda * 3] * x_3;
  y_6 += A1[2 + lda * 3] * x_3;
  y_7 += A1[3 + lda * 3] * x_3;
  A0 += 4 * lda;
  A1 += 4 * lda;
  x += 4;
  k = 8;
  for (; k < kmax - 3; k += 4) {
    x_0 = x[0];
    x_1 = x[1];
    x_2 = x[2];
    x_3 = x[3];
    y_0 += A0[0 + lda * 0] * x_0;
    y_1 += A0[1 + lda * 0] * x_0;
    y_2 += A0[2 + lda * 0] * x_0;
    y_3 += A0[3 + lda * 0] * x_0;
    y_4 += A1[0 + lda * 0] * x_0;
    y_5 += A1[1 + lda * 0] * x_0;
    y_6 += A1[2 + lda * 0] * x_0;
    y_7 += A1[3 + lda * 0] * x_0;
    y_0 += A0[0 + lda * 1] * x_1;
    y_1 += A0[1 + lda * 1] * x_1;
    y_2 += A0[2 + lda * 1] * x_1;
    y_3 += A0[3 + lda * 1] * x_1;
    y_4 += A1[0 + lda * 1] * x_1;
    y_5 += A1[1 + lda * 1] * x_1;
    y_6 += A1[2 + lda * 1] * x_1;
    y_7 += A1[3 + lda * 1] * x_1;
    y_0 += A0[0 + lda * 2] * x_2;
    y_1 += A0[1 + lda * 2] * x_2;
    y_2 += A0[2 + lda * 2] * x_2;
    y_3 += A0[3 + lda * 2] * x_2;
    y_4 += A1[0 + lda * 2] * x_2;
    y_5 += A1[1 + lda * 2] * x_2;
    y_6 += A1[2 + lda * 2] * x_2;
    y_7 += A1[3 + lda * 2] * x_2;
    y_0 += A0[0 + lda * 3] * x_3;
    y_1 += A0[1 + lda * 3] * x_3;
    y_2 += A0[2 + lda * 3] * x_3;
    y_3 += A0[3 + lda * 3] * x_3;
    y_4 += A1[0 + lda * 3] * x_3;
    y_5 += A1[1 + lda * 3] * x_3;
    y_6 += A1[2 + lda * 3] * x_3;
    y_7 += A1[3 + lda * 3] * x_3;
    A0 += 4 * lda;
    A1 += 4 * lda;
    x += 4;
  }
  for (; k < kmax; k++) {
    x_0 = x[0];
    y_0 += A0[0 + lda * 0] * x_0;
    y_1 += A0[1 + lda * 0] * x_0;
    y_2 += A0[2 + lda * 0] * x_0;
    y_3 += A0[3 + lda * 0] * x_0;
    y_4 += A1[0 + lda * 0] * x_0;
    y_5 += A1[1 + lda * 0] * x_0;
    y_6 += A1[2 + lda * 0] * x_0;
    y_7 += A1[3 + lda * 0] * x_0;
    A0 += 1 * lda;
    A1 += 1 * lda;
    x += 1;
  }
  if (alg == 0) {
    y[0] = y_0;
    y[1] = y_1;
    y[2] = y_2;
    y[3] = y_3;
    y[4] = y_4;
    y[5] = y_5;
    y[6] = y_6;
    y[7] = y_7;
  } else if (alg == 1) {
    y[0] += y_0;
    y[1] += y_1;
    y[2] += y_2;
    y[3] += y_3;
    y[4] += y_4;
    y[5] += y_5;
    y[6] += y_6;
    y[7] += y_7;
  } else {
    y[0] -= y_0;
    y[1] -= y_1;
    y[2] -= y_2;
    y[3] -= y_3;
    y[4] -= y_4;
    y[5] -= y_5;
    y[6] -= y_6;
    y[7] -= y_7;
  }
}
```