user: 下面的汇编指令对应的C源代码是什么：

```asm
<iswt2_input4_step>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x50,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    %rsi,-0x30(%rbp)
  mov    %rdx,-0x38(%rbp)
  mov    %rcx,-0x40(%rbp)
  mov    %r8d,-0x44(%rbp)
  mov    %r9d,-0x48(%rbp)
  mov    -0x44(%rbp),%eax
  imul   -0x48(%rbp),%eax
  cltq
  shl    $0x3,%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x10(%rbp)
  mov    -0x44(%rbp),%eax
  imul   -0x48(%rbp),%eax
  cltq
  shl    $0x3,%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x8(%rbp)
  mov    -0x44(%rbp),%eax
  imul   -0x48(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x44(%rbp),%eax
  imul   -0x48(%rbp),%eax
  mov    0x40(%rbp),%edx
  sub    $0x1,%edx
  imul   -0x44(%rbp),%edx
  imul   -0x48(%rbp),%edx
  movslq %edx,%rdx
  lea    0x0(,%rdx,8),%rsi
  mov    -0x28(%rbp),%rdx
  lea    (%rsi,%rdx,1),%rdi
  mov    -0x10(%rbp),%rdx
  mov    %eax,%esi
  call   <verbatim_copy@plt>
  movl   $0x0,-0x14(%rbp)
  jmp    L23
L19:
  mov    0x40(%rbp),%eax
  sub    -0x14(%rbp),%eax
  mov    %eax,%edi
  mov    0x40(%rbp),%eax
  sub    -0x14(%rbp),%eax
  sub    $0x1,%eax
  imul   -0x44(%rbp),%eax
  imul   -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x40(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    0x40(%rbp),%eax
  sub    -0x14(%rbp),%eax
  sub    $0x1,%eax
  imul   -0x44(%rbp),%eax
  imul   -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x38(%rbp),%rax
  add    %rax,%rdx
  mov    0x40(%rbp),%eax
  sub    -0x14(%rbp),%eax
  sub    $0x1,%eax
  imul   -0x44(%rbp),%eax
  imul   -0x48(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rsi
  mov    -0x30(%rbp),%rax
  add    %rax,%rsi
  mov    -0x48(%rbp),%r9d
  mov    -0x44(%rbp),%r8d
  mov    -0x10(%rbp),%rax
  sub    $0x8,%rsp
  push   %rdi
  mov    0x38(%rbp),%edi
  push   %rdi
  push   0x30(%rbp)
  push   0x28(%rbp)
  mov    0x20(%rbp),%edi
  push   %rdi
  mov    0x18(%rbp),%edi
  push   %rdi
  push   -0x8(%rbp)
  mov    %rax,%rdi
  call   <iswt2@plt>
  add    $0x40,%rsp
  mov    0x40(%rbp),%eax
  sub    $0x1,%eax
  cmp    %eax,-0x14(%rbp)
  je     L29
  mov    -0x44(%rbp),%eax
  imul   -0x48(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x44(%rbp),%eax
  imul   -0x48(%rbp),%eax
  mov    %eax,%esi
  mov    -0x10(%rbp),%rdx
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <verbatim_copy@plt>
L29:
  addl   $0x1,-0x14(%rbp)
L23:
  mov    -0x14(%rbp),%eax
  cmp    0x40(%rbp),%eax
  jl     L19
  mov    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    -0x44(%rbp),%eax
  imul   -0x48(%rbp),%eax
  mov    %eax,%edx
  mov    -0x44(%rbp),%eax
  imul   -0x48(%rbp),%eax
  mov    %eax,%esi
  mov    -0x8(%rbp),%rax
  mov    %edx,%ecx
  mov    0x10(%rbp),%rdx
  mov    %rax,%rdi
  call   <verbatim_copy@plt>
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  nop
  leave
  ret
```

assistant: ```c
void iswt2_input4_step(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 count;
  double *matrixApproxTemp, *matrixApproxOut;
  matrixApproxTemp = malloc(matrixInRow * matrixInCol * sizeof(double));
  matrixApproxOut = malloc(matrixInRow * matrixInCol * sizeof(double));
  verbatim_copy(matrixInApprox + (step - 1) * matrixInRow * matrixInCol, matrixInRow * matrixInCol, matrixApproxTemp, matrixInRow * matrixInCol);
  for (count = 0; count < step; count++) {
    iswt2(matrixApproxTemp, matrixInColDetail + (step - count - 1) * matrixInRow * matrixInCol, matrixInRowDetail + (step - count - 1) * matrixInRow * matrixInCol, matrixInDetail + (step - count - 1) * matrixInRow * matrixInCol, matrixInRow, matrixInCol, matrixApproxOut, matrixOutRow, matrixOutCol, filterLow, filterHi, filterLength, step - count);
    if (count != (step - 1)) {
      verbatim_copy(matrixApproxOut, matrixInRow * matrixInCol, matrixApproxTemp, matrixInRow * matrixInCol);
    }
  }
  free(matrixApproxTemp);
  verbatim_copy(matrixApproxOut, matrixInRow * matrixInCol, matrixOut, matrixInRow * matrixInCol);
  free(matrixApproxOut);
  return;
}
```