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

```asm
<jerasure_matrix_decode>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  mov    %edi,%ebx
  mov    %esi,0x24(%rsp)
  mov    %edx,%edi
  mov    %edx,0x20(%rsp)
  mov    %rcx,0x18(%rsp)
  mov    %r8d,%ebp
  mov    %r9,%rdx
  lea    -0x8(%rdi),%eax
  test   $0xfffffff7,%eax
  je     L132
  cmp    $0x20,%edi
  jne    L336
L132:
  mov    0x24(%rsp),%esi
  mov    %ebx,%edi
  call   <jerasure_erasures_to_erased@plt>
  mov    %rax,%r15
  test   %rax,%rax
  je     L77
  test   %ebx,%ebx
  jle    L110
  mov    %ebx,%edx
  mov    %ebx,0x4(%rsp)
  mov    $0x0,%eax
  mov    $0x0,%r12d
  jmp    L172
L381:
  add    $0x1,%rax
  cmp    %rdx,%rax
  je     L474
L172:
  cmpl   $0x0,(%r15,%rax,4)
  je     L381
  add    $0x1,%r12d
  mov    %eax,0x4(%rsp)
  jmp    L381
L474:
  test   %ebp,%ebp
  je     L182
  movslq %ebx,%rax
  cmpl   $0x0,(%r15,%rax,4)
  je     L54
L182:
  mov    %ebx,0x4(%rsp)
L54:
  cmp    $0x1,%r12d
  jg     L128
  jne    L430
  test   %ebp,%ebp
  je     L128
  movslq %ebx,%rax
  cmpl   $0x0,(%r15,%rax,4)
  je     L263
L128:
  lea    0x0(,%rbx,4),%edi
  call   <malloc@plt>
  mov    %rax,0x8(%rsp)
  test   %rax,%rax
  je     L386
  mov    %ebx,%edi
  imul   %ebx,%edi
  shl    $0x2,%edi
  call   <malloc@plt>
  mov    %rax,0x10(%rsp)
  test   %rax,%rax
  je     L438
  sub    $0x8,%rsp
  push   0x10(%rsp)
  mov    0x20(%rsp),%r9
  mov    %r15,%r8
  mov    0x28(%rsp),%rcx
  mov    0x30(%rsp),%edx
  mov    0x34(%rsp),%esi
  mov    %ebx,%edi
  call   <jerasure_make_decoding_matrix@plt>
  add    $0x10,%rsp
  test   %rax,%rax
  js     L20
L164:
  test   %r12d,%r12d
  jle    L219
  cmpl   $0x0,0x4(%rsp)
  jle    L219
L315:
  mov    %r15,%r13
  mov    $0x0,%r14d
  mov    $0x0,%ebp
  mov    %r15,0x28(%rsp)
  mov    0x4(%rsp),%r15d
  jmp    L410
L186:
  mov    $0x0,%r12d
  jmp    L182
L386:
  mov    %r15,%rdi
  call   <free@plt>
  mov    $0xffffffff,%eax
  jmp    L58
L438:
  mov    %r15,%rdi
  call   <free@plt>
  mov    0x8(%rsp),%rdi
  call   <free@plt>
  mov    $0xffffffff,%eax
  jmp    L58
L20:
  mov    %r15,%rdi
  call   <free@plt>
  mov    0x8(%rsp),%rdi
  call   <free@plt>
  mov    0x10(%rsp),%rdi
  call   <free@plt>
  mov    $0xffffffff,%eax
  jmp    L58
L430:
  movq   $0x0,0x8(%rsp)
  movq   $0x0,0x10(%rsp)
  jmp    L164
L7:
  add    $0x1,%ebp
  add    $0x4,%r13
  add    %ebx,%r14d
  test   %r12d,%r12d
  jle    L479
  cmp    %ebp,%r15d
  jle    L451
L410:
  cmpl   $0x0,0x0(%r13)
  je     L7
  movslq %r14d,%rax
  mov    0x10(%rsp),%rsi
  lea    (%rsi,%rax,4),%rdx
  mov    0x80(%rsp),%eax
  push   %rax
  push   0x80(%rsp)
  mov    0x80(%rsp),%r9
  mov    %ebp,%r8d
  mov    0x18(%rsp),%rcx
  mov    0x30(%rsp),%esi
  mov    %ebx,%edi
  call   <jerasure_matrix_dotprod@plt>
  sub    $0x1,%r12d
  add    $0x10,%rsp
  jmp    L7
L451:
  mov    0x28(%rsp),%r15
L219:
  test   %r12d,%r12d
  jg     L423
L318:
  mov    0x24(%rsp),%esi
  test   %esi,%esi
  jle    L347
  movslq %ebx,%rax
  lea    (%r15,%rax,4),%r12
  add    %ebx,%esi
  mov    %esi,%r14d
  mov    %ebx,%ebp
  mov    $0x0,%r13d
  jmp    L203
L443:
  mov    %ebx,0x4(%rsp)
  mov    %ebp,%r12d
  movq   $0x0,0x8(%rsp)
  movq   $0x0,0x10(%rsp)
  jmp    L219
L479:
  mov    0x28(%rsp),%r15
  jmp    L219
L270:
  add    $0x4,%r12
  add    %ebx,%r13d
  add    $0x1,%ebp
  cmp    %r14d,%ebp
  je     L347
L203:
  cmpl   $0x0,(%r12)
  je     L270
  movslq %r13d,%rax
  mov    0x18(%rsp),%rcx
  lea    (%rcx,%rax,4),%rdx
  mov    0x80(%rsp),%eax
  push   %rax
  push   0x80(%rsp)
  mov    0x80(%rsp),%r9
  mov    %ebp,%r8d
  mov    $0x0,%ecx
  mov    0x30(%rsp),%esi
  mov    %ebx,%edi
  call   <jerasure_matrix_dotprod@plt>
  add    $0x10,%rsp
  jmp    L270
L347:
  mov    %r15,%rdi
  call   <free@plt>
  mov    0x8(%rsp),%rax
  test   %rax,%rax
  je     L460
  mov    %rax,%rdi
  call   <free@plt>
L460:
  mov    $0x0,%eax
  mov    0x10(%rsp),%rdi
  test   %rdi,%rdi
  je     L58
  call   <free@plt>
  mov    $0x0,%eax
L58:
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L336:
  mov    $0xffffffff,%eax
  jmp    L58
L77:
  mov    $0xffffffff,%eax
  jmp    L58
L263:
  movq   $0x0,0x8(%rsp)
  movq   $0x0,0x10(%rsp)
  cmpl   $0x0,0x4(%rsp)
  jg     L315
L423:
  lea    0x0(,%rbx,4),%edi
  call   <malloc@plt>
  mov    %rax,%rbp
  test   %ebx,%ebx
  jle    L416
  mov    %rax,%rcx
  mov    $0x0,%eax
  mov    0x4(%rsp),%esi
L144:
  cmp    %eax,%esi
  setle  %dl
  movzbl %dl,%edx
  add    %eax,%edx
  mov    %edx,(%rcx)
  add    $0x1,%eax
  add    $0x4,%rcx
  cmp    %eax,%ebx
  jne    L144
L416:
  mov    0x80(%rsp),%eax
  push   %rax
  push   0x80(%rsp)
  mov    0x80(%rsp),%r9
  mov    0x14(%rsp),%r8d
  mov    %rbp,%rcx
  mov    0x28(%rsp),%rdx
  mov    0x30(%rsp),%esi
  mov    %ebx,%edi
  call   <jerasure_matrix_dotprod@plt>
  mov    %rbp,%rdi
  call   <free@plt>
  add    $0x10,%rsp
  jmp    L318
L110:
  test   %ebp,%ebp
  je     L443
  movslq %ebx,%rax
  mov    (%r15,%rax,4),%r12d
  test   %r12d,%r12d
  jne    L186
  mov    %ebx,0x4(%rsp)
  movq   $0x0,0x8(%rsp)
  movq   $0x0,0x10(%rsp)
  jmp    L164
```

assistant: ```c
int jerasure_matrix_decode(int k, int m, int w, int *matrix, int row_k_ones, int *erasures, char **data_ptrs, char **coding_ptrs, int size) {
  int i, edd, lastdrive;
  int *tmpids;
  int *erased, *decoding_matrix, *dm_ids;
  if (w != 8 && w != 16 && w != 32)
    return -1;
  erased = jerasure_erasures_to_erased(k, m, erasures);
  if (erased == NULL)
    return -1;
  lastdrive = k;
  edd = 0;
  for (i = 0; i < k; i++) {
    if (erased[i]) {
      edd++;
      lastdrive = i;
    }
  }
  if (!row_k_ones || erased[k])
    lastdrive = k;
  dm_ids = NULL;
  decoding_matrix = NULL;
  if (edd > 1 || (edd > 0 && (!row_k_ones || erased[k]))) {
    dm_ids = (int *)malloc(sizeof(int) * (k));
    if (dm_ids == NULL) {
      free(erased);
      return -1;
    }
    decoding_matrix = (int *)malloc(sizeof(int) * (k * k));
    if (decoding_matrix == NULL) {
      free(erased);
      free(dm_ids);
      return -1;
    }
    if (jerasure_make_decoding_matrix(k, m, w, matrix, erased, decoding_matrix, dm_ids) < 0) {
      free(erased);
      free(dm_ids);
      free(decoding_matrix);
      return -1;
    }
  }
  for (i = 0; edd > 0 && i < lastdrive; i++) {
    if (erased[i]) {
      jerasure_matrix_dotprod(k, w, decoding_matrix + (i * k), dm_ids, i, data_ptrs, coding_ptrs, size);
      edd--;
    }
  }
  if (edd > 0) {
    tmpids = (int *)malloc(sizeof(int) * (k));
    for (i = 0; i < k; i++) {
      tmpids[i] = (i < lastdrive) ? i : i + 1;
    }
    jerasure_matrix_dotprod(k, w, matrix, tmpids, lastdrive, data_ptrs, coding_ptrs, size);
    free(tmpids);
  }
  for (i = 0; i < m; i++) {
    if (erased[k + i]) {
      jerasure_matrix_dotprod(k, w, matrix + (i * k), NULL, i + k, data_ptrs, coding_ptrs, size);
    }
  }
  free(erased);
  if (dm_ids != NULL)
    free(dm_ids);
  if (decoding_matrix != NULL)
    free(decoding_matrix);
  return 0;
}
```