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

```asm
<svbksb>:
  endbr64
  push   %r15
  mov    %ecx,%r15d
  push   %r14
  push   %r13
  mov    %rsi,%r13
  mov    %r8d,%esi
  push   %r12
  mov    %r8d,%r12d
  push   %rbp
  mov    %rdx,%rbp
  push   %rbx
  mov    %rdi,%rbx
  mov    $0x1,%edi
  sub    $0x18,%rsp
  mov    %r9,0x8(%rsp)
  mov    0x50(%rsp),%r14
  call   <vector@plt>
  mov    %rax,%rdi
  test   %r12d,%r12d
  jle    L135
  lea    0x1(%r12),%ecx
  mov    0x8(%rsp),%r9
  lea    -0x1(%r12),%esi
  mov    $0x4,%edx
  lea    0x0(,%rcx,4),%r10
  pxor   %xmm3,%xmm3
  lea    0x1(%r15),%r8d
  jmp    L63
  nopw   0x0(%rax,%rax,1)
L53:
  movss  %xmm1,(%rdi,%rdx,1)
  add    $0x4,%rdx
  cmp    %rdx,%r10
  je     L153
L63:
  movss  0x0(%r13,%rdx,1),%xmm2
  ucomiss %xmm3,%xmm2
  jp     L68
  movaps %xmm3,%xmm1
  je     L53
L68:
  test   %r15d,%r15d
  jle    L64
  mov    $0x1,%eax
  movaps %xmm3,%xmm1
L116:
  mov    (%rbx,%rax,8),%r11
  movss  (%r11,%rdx,1),%xmm0
  mulss  (%r9,%rax,4),%xmm0
  add    $0x1,%rax
  addss  %xmm0,%xmm1
  cmp    %rax,%r8
  jne    L116
  divss  %xmm2,%xmm1
L126:
  movss  %xmm1,(%rdi,%rdx,1)
  add    $0x4,%rdx
  cmp    %rdx,%r10
  jne    L63
L153:
  mov    %r12d,%eax
  mov    %r12d,%r11d
  mov    $0x1,%r9d
  shr    $0x2,%eax
  and    $0xfffffffc,%r11d
  lea    -0x1(%rax),%r8d
  lea    0x1(%r11),%ebx
  shl    $0x4,%r8
  add    $0x14,%r8
  nopw   0x0(%rax,%rax,1)
L15:
  mov    0x0(%rbp,%r9,8),%rdx
  cmp    $0x2,%esi
  jbe    L140
  mov    $0x4,%eax
  movaps %xmm3,%xmm1
  xchg   %ax,%ax
L21:
  movups (%rdi,%rax,1),%xmm0
  movups (%rdx,%rax,1),%xmm4
  add    $0x10,%rax
  mulps  %xmm4,%xmm0
  addss  %xmm0,%xmm1
  movaps %xmm0,%xmm2
  shufps $0x55,%xmm0,%xmm2
  addss  %xmm1,%xmm2
  movaps %xmm0,%xmm1
  unpckhps %xmm0,%xmm1
  shufps $0xff,%xmm0,%xmm0
  addss  %xmm2,%xmm1
  addss  %xmm0,%xmm1
  cmp    %r8,%rax
  jne    L21
  mov    %ebx,%eax
  cmp    %r11d,%r12d
  je     L123
L22:
  movslq %eax,%r13
  movss  (%rdx,%r13,4),%xmm0
  mulss  (%rdi,%r13,4),%xmm0
  lea    0x0(,%r13,4),%r10
  lea    0x1(%rax),%r13d
  addss  %xmm0,%xmm1
  cmp    %r13d,%r12d
  jl     L123
  movss  0x4(%rdi,%r10,1),%xmm0
  mulss  0x4(%rdx,%r10,1),%xmm0
  add    $0x2,%eax
  addss  %xmm0,%xmm1
  cmp    %eax,%r12d
  jl     L123
  movss  0x8(%rdi,%r10,1),%xmm0
  mulss  0x8(%rdx,%r10,1),%xmm0
  addss  %xmm0,%xmm1
L123:
  movss  %xmm1,(%r14,%r9,4)
  add    $0x1,%r9
  cmp    %r9,%rcx
  jne    L15
L135:
  add    $0x18,%rsp
  mov    %r12d,%edx
  mov    $0x1,%esi
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    1060 <free_vector@plt>
  nopw   0x0(%rax,%rax,1)
L140:
  movaps %xmm3,%xmm1
  mov    $0x1,%eax
  jmp    L22
L64:
  movaps %xmm3,%xmm1
  divss  %xmm2,%xmm1
  jmp    L126
```

assistant: ```c
void svbksb(float **u, float w[], float **v, int m, int n, float b[], float x[]) {
  int jj, j, i;
  float s, *tmp;
  tmp = vector(1, n);
  for (j = 1; j <= n; j++) {
    s = 0.0;
    if (w[j]) {
      for (i = 1; i <= m; i++)
        s += u[i][j] * b[i];
      s /= w[j];
    }
    tmp[j] = s;
  }
  for (j = 1; j <= n; j++) {
    s = 0.0;
    for (jj = 1; jj <= n; jj++)
      s += v[j][jj] * tmp[jj];
    x[j] = s;
  }
  free_vector(tmp, 1, n);
}
```