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

```asm
<ppsum>:
  endbr64
  push   %r15
  push   %r14
  mov    %rdi,%r14
  push   %r13
  push   %r12
  movslq %edx,%r12
  push   %rbp
  mov    %r12d,%edx
  mov    %rsi,%rbp
  push   %rbx
  sub    $0x18,%rsp
  cmp    $0x1,%ecx
  jg     L37
  shr    $0x1f,%edx
  lea    0x1(%rcx),%r13d
  add    %r12d,%edx
  mov    %r13d,%ecx
  sar    %edx
  mov    %edx,0x8(%rsp)
  call   <ppsum>
  movslq 0x8(%rsp),%r8
  mov    %r12d,%r9d
  mov    %r13d,%ecx
  lea    0x0(,%r8,4),%rax
  sub    %r8d,%r9d
  mov    %r8,0x8(%rsp)
  lea    0x0(%rbp,%rax,1),%rbx
  mov    %r9d,%edx
  lea    (%r14,%rax,1),%rdi
  mov    -0x4(%rbp,%rax,1),%r15d
  mov    %rbx,%rsi
  call   <ppsum>
  test   %r12d,%r12d
  lea    0x3(%r12),%ecx
  mov    0x8(%rsp),%r8
  cmovns %r12d,%ecx
  sar    $0x2,%ecx
  movslq %ecx,%rcx
  add    %rcx,%r8
  lea    0x0(%rbp,%r8,4),%rdx
  cmp    %rdx,%rbx
  jae    L35
  lea    -0x1(,%rcx,4),%rcx
  mov    %rbx,%rax
  mov    %rcx,%rsi
  shr    $0x2,%rsi
  add    $0x1,%rsi
  cmp    $0xb,%rcx
  jbe    L23
  mov    %rsi,%rcx
  movd   %r15d,%xmm2
  shr    $0x2,%rcx
  pshufd $0x0,%xmm2,%xmm1
  shl    $0x4,%rcx
  add    %rbx,%rcx
  nopl   0x0(%rax,%rax,1)
L38:
  movdqu (%rax),%xmm0
  add    $0x10,%rax
  paddd  %xmm1,%xmm0
  movups %xmm0,-0x10(%rax)
  cmp    %rax,%rcx
  jne    L38
  mov    %rsi,%rax
  and    $0xfffffffffffffffc,%rax
  lea    (%rbx,%rax,4),%rbx
  cmp    %rax,%rsi
  je     L35
L23:
  lea    0x4(%rbx),%rax
  add    %r15d,(%rbx)
  cmp    %rax,%rdx
  jbe    L35
  lea    0x8(%rbx),%rax
  add    %r15d,0x4(%rbx)
  cmp    %rax,%rdx
  jbe    L35
  add    %r15d,0x8(%rbx)
L35:
  lea    0x0(%rbp,%r12,4),%rdi
  cmp    %rdi,%rdx
  jae    L89
  lea    -0x1(%rdi),%rcx
  mov    %rdx,%rax
  sub    %rdx,%rcx
  mov    %rcx,%rsi
  shr    $0x2,%rsi
  add    $0x1,%rsi
  cmp    $0xb,%rcx
  jbe    L128
  mov    %rsi,%rcx
  movd   %r15d,%xmm3
  shr    $0x2,%rcx
  pshufd $0x0,%xmm3,%xmm1
  shl    $0x4,%rcx
  add    %rdx,%rcx
  nop
L0:
  movdqu (%rax),%xmm0
  add    $0x10,%rax
  paddd  %xmm1,%xmm0
  movups %xmm0,-0x10(%rax)
  cmp    %rcx,%rax
  jne    L0
  mov    %rsi,%rax
  and    $0xfffffffffffffffc,%rax
  lea    (%rdx,%rax,4),%rdx
  cmp    %rax,%rsi
  je     L89
L128:
  lea    0x4(%rdx),%rax
  add    %r15d,(%rdx)
  cmp    %rax,%rdi
  jbe    L89
  lea    0x8(%rdx),%rax
  add    %r15d,0x4(%rdx)
  cmp    %rax,%rdi
  jbe    L89
  add    %r15d,0x8(%rdx)
L89:
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax)
L37:
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    1050 <psum@plt>
```

assistant: ```c
int ppsum(int *a, int *p, int n, int l) {
  if (l > 1)
    return psum(a, p, n);
  int n1 = n / 2;
  int s1;
#pragma omp task shared(s1)
  {
    ppsum(a, p, n1, l + 1);
    s1 = p[n1 - 1];
  }
#pragma omp task
  { ppsum(a + n1, p + n1, n - n1, l + 1); }
#pragma omp taskwait
#pragma omp task
  for (int *pp = p + n1, *ep = p + n1 + n1 / 2; pp < ep; *pp++ += s1)
    ;
#pragma omp task
  for (int *pp = p + n1 + n1 / 2, *ep = p + n; pp < ep; *pp++ += s1)
    ;
#pragma omp taskwait
}
```