user: 请从给定的汇编指令推导出C源代码：

```asm
<iswt2>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  mov    %r9d,%r12d
  push   %rbp
  mov    %r8d,%ebp
  push   %rbx
  sub    $0x68,%rsp
  mov    0xa0(%rsp),%rax
  mov    %rdi,0x28(%rsp)
  mov    %rsi,0x30(%rsp)
  mov    0xb8(%rsp),%rbx
  mov    %rax,0x58(%rsp)
  mov    0xc0(%rsp),%rax
  mov    %rdx,0x38(%rsp)
  mov    0xd0(%rsp),%r13d
  mov    %rax,0x8(%rsp)
  mov    0xc8(%rsp),%eax
  mov    %rcx,0x40(%rsp)
  mov    %eax,0x24(%rsp)
  mov    %r8d,%eax
  imul   %r9d,%eax
  lea    0x0(,%rax,8),%r14d
  mov    %r14d,%edi
  mov    %r14d,0x54(%rsp)
  call   <malloc@plt>
  mov    %r14d,%edi
  mov    %rax,0x18(%rsp)
  call   <malloc@plt>
  mov    %rax,0x10(%rsp)
  test   %r12d,%r12d
  jle    L20
  movslq %ebp,%rax
  xor    %r15d,%r15d
  xor    %r14d,%r14d
  mov    %r12d,0x50(%rsp)
  lea    0x0(,%rax,8),%rdx
  mov    %ebp,%r12d
  mov    %r15d,%ebp
  mov    0x24(%rsp),%r15d
  mov    %rdx,0x48(%rsp)
  mov    %rbx,%rdx
  mov    %r14,%rbx
  mov    %rdx,%r14
  nopw   0x0(%rax,%rax,1)
L38:
  mov    0x18(%rsp),%rax
  sub    $0x8,%rsp
  mov    %r14,%r9
  mov    %r12d,%r8d
  mov    %r12d,%edx
  add    $0x1,%ebp
  lea    (%rax,%rbx,1),%rcx
  mov    0x38(%rsp),%rax
  lea    (%rax,%rbx,1),%rsi
  mov    0x30(%rsp),%rax
  push   %r13
  push   %r15
  push   0x20(%rsp)
  lea    (%rax,%rbx,1),%rdi
  call   <iswt_conv_step@plt>
  mov    0x30(%rsp),%rax
  mov    %r14,%r9
  mov    %r12d,%r8d
  add    $0x18,%rsp
  mov    %r12d,%edx
  lea    (%rax,%rbx,1),%rcx
  mov    0x48(%rsp),%rax
  lea    (%rax,%rbx,1),%rsi
  mov    0x40(%rsp),%rax
  push   %r13
  push   %r15
  push   0x20(%rsp)
  lea    (%rax,%rbx,1),%rdi
  call   <iswt_conv_step@plt>
  add    0x68(%rsp),%rbx
  add    $0x20,%rsp
  cmp    %ebp,0x50(%rsp)
  jne    L38
  mov    %r12d,%ebp
  mov    0x50(%rsp),%r12d
  mov    %r14,%rbx
L20:
  mov    0x54(%rsp),%r15d
  mov    %r15d,%edi
  call   <malloc@plt>
  mov    0x18(%rsp),%r14
  mov    %r12d,%r9d
  mov    %ebp,%r8d
  mov    %rax,%rcx
  mov    %ebp,%edx
  mov    %r12d,%esi
  mov    %rax,0x28(%rsp)
  mov    %r14,%rdi
  call   <matrix_tran@plt>
  mov    %r14,%rdi
  call   <free@plt>
  mov    %r15d,%edi
  call   <malloc@plt>
  mov    0x10(%rsp),%rdi
  mov    %r12d,%r9d
  mov    %ebp,%r8d
  mov    %rax,%rcx
  mov    %ebp,%edx
  mov    %r12d,%esi
  mov    %rax,0x30(%rsp)
  mov    %rax,%r14
  call   <matrix_tran@plt>
  mov    0x10(%rsp),%rdi
  call   <free@plt>
  mov    %r15d,%edi
  call   <malloc@plt>
  mov    %rax,0x38(%rsp)
  mov    %rax,%r15
  test   %ebp,%ebp
  jle    L19
  mov    0x28(%rsp),%rdi
  movslq %r12d,%r10
  mov    %r14,%rsi
  mov    %ebp,0x18(%rsp)
  shl    $0x3,%r10
  mov    %r13d,0x50(%rsp)
  mov    %rbx,%r9
  xor    %r14d,%r14d
  mov    %rdi,%rbp
  mov    %rsi,%rbx
  mov    %r10,%r13
  nopl   0x0(%rax)
L25:
  sub    $0x8,%rsp
  mov    %r15,%rcx
  mov    %rbx,%rsi
  mov    %rbp,%rdi
  mov    0x58(%rsp),%eax
  mov    %r12d,%r8d
  mov    %r12d,%edx
  add    $0x1,%r14d
  add    %r13,%rbp
  add    %r13,%rbx
  add    %r13,%r15
  push   %rax
  mov    0x34(%rsp),%eax
  push   %rax
  push   0x20(%rsp)
  mov    %r9,0x30(%rsp)
  call   <iswt_conv_step@plt>
  add    $0x20,%rsp
  mov    0x10(%rsp),%r9
  cmp    %r14d,0x18(%rsp)
  jne    L25
  mov    0x18(%rsp),%ebp
L19:
  mov    0x28(%rsp),%rdi
  call   <free@plt>
  mov    0x30(%rsp),%rdi
  call   <free@plt>
  mov    0x38(%rsp),%rbx
  mov    %r12d,%r9d
  mov    %ebp,%r8d
  mov    0x58(%rsp),%rcx
  mov    %r12d,%edx
  mov    %ebp,%esi
  mov    %rbx,%rdi
  call   <matrix_tran@plt>
  add    $0x68,%rsp
  mov    %rbx,%rdi
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    1080 <free@plt>
```

assistant: ```c
void iswt2(double *matrixInApprox, double *matrixInColDetail, double *matrixInRowDetail, double *matrixInDetail, int matrixInRow, int matrixInCol, double *matrixOut, int matrixOutRow, int matrixOutCol, double *filterLow, double *filterHi, int filterLength, int step) {
  int row, col;
  double *matrixOutApproxPre, *matrixOutDetailPre;
  double *matrixOutPre;
  double *pMatrixOutApproxPre, *pMatrixOutDetailPre;
  matrixOutApproxPre = malloc(matrixInRow * matrixInCol * sizeof(double));
  matrixOutDetailPre = malloc(matrixInRow * matrixInCol * sizeof(double));
  for (col = 0; col < matrixInCol; col++) {
    iswt_conv_step(matrixInApprox + col * matrixInRow, matrixInColDetail + col * matrixInRow, matrixInRow, matrixOutApproxPre + col * matrixInRow, matrixInRow, filterLow, filterHi, filterLength, step);
    iswt_conv_step(matrixInRowDetail + col * matrixInRow, matrixInDetail + col * matrixInRow, matrixInRow, matrixOutDetailPre + col * matrixInRow, matrixInRow, filterLow, filterHi, filterLength, step);
  }
  pMatrixOutApproxPre = malloc(matrixInRow * matrixInCol * sizeof(double));
  matrix_tran(matrixOutApproxPre, matrixInCol, matrixInRow, pMatrixOutApproxPre, matrixInRow, matrixInCol);
  free(matrixOutApproxPre);
  pMatrixOutDetailPre = malloc(matrixInRow * matrixInCol * sizeof(double));
  matrix_tran(matrixOutDetailPre, matrixInCol, matrixInRow, pMatrixOutDetailPre, matrixInRow, matrixInCol);
  free(matrixOutDetailPre);
  matrixOutPre = malloc(matrixInRow * matrixInCol * sizeof(double));
  for (row = 0; row < matrixInRow; row++) {
    iswt_conv_step(pMatrixOutApproxPre + row * matrixInCol, pMatrixOutDetailPre + row * matrixInCol, matrixInCol, matrixOutPre + row * matrixInCol, matrixInCol, filterLow, filterHi, filterLength, step);
  }
  free(pMatrixOutApproxPre);
  free(pMatrixOutDetailPre);
  matrix_tran(matrixOutPre, matrixInRow, matrixInCol, matrixOut, matrixInRow, matrixInCol);
  free(matrixOutPre);
  return;
}
```