Generated by Cython 0.29.28

Yellow lines hint at Python interaction.
Click on a line that starts with a "+" to see the C code that Cython generated for it.

Raw output: cg_ext.c

+01: #cython: wraparound=False, boundscheck=False, cdivision=True, profile=False, nonecheck=False, overflowcheck=False, cdivision_warnings=False, unraisable_tracebacks=False
  __pyx_t_1 = __Pyx_PyDict_NewPresized(0); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 1, __pyx_L1_error)
  __Pyx_GOTREF(__pyx_t_1);
  if (PyDict_SetItem(__pyx_d, __pyx_n_s_test, __pyx_t_1) < 0) __PYX_ERR(0, 1, __pyx_L1_error)
  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
 02: import cython
 03: 
 04: # import both numpy and the Cython declarations for numpy
+05: import numpy as np
  __pyx_t_1 = __Pyx_Import(__pyx_n_s_numpy, 0, -1); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 5, __pyx_L1_error)
  __Pyx_GOTREF(__pyx_t_1);
  if (PyDict_SetItem(__pyx_d, __pyx_n_s_np, __pyx_t_1) < 0) __PYX_ERR(0, 5, __pyx_L1_error)
  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
 06: cimport numpy as np
 07: 
 08: # declare the interface to the C code
 09: cdef extern from "cg.c":
 10:     int _jacobi_precon_c(double* data, long* colind, long* row_ptr, double* precon, int M)
 11:     int _cg_solve_c(double* data, long* colind, long* row_ptr, double* b, double* x, int imax, double tol, double a_tol, int M)
 12:     int _cg_solve_c_precon(double* data, long* colind, long* row_ptr, double* b, double* x, int imax, double tol, double a_tol, int M, double* precon)
 13: 
+14: def jacobi_precon_c(object csr_sparse, np.ndarray[double, ndim=1, mode="c"] precon not None):
/* Python wrapper */
static PyObject *__pyx_pw_5anuga_9utilities_6cg_ext_1jacobi_precon_c(PyObject *__pyx_self, PyObject *__pyx_args, PyObject *__pyx_kwds); /*proto*/
static PyMethodDef __pyx_mdef_5anuga_9utilities_6cg_ext_1jacobi_precon_c = {"jacobi_precon_c", (PyCFunction)(void*)(PyCFunctionWithKeywords)__pyx_pw_5anuga_9utilities_6cg_ext_1jacobi_precon_c, METH_VARARGS|METH_KEYWORDS, 0};
static PyObject *__pyx_pw_5anuga_9utilities_6cg_ext_1jacobi_precon_c(PyObject *__pyx_self, PyObject *__pyx_args, PyObject *__pyx_kwds) {
  PyObject *__pyx_v_csr_sparse = 0;
  PyArrayObject *__pyx_v_precon = 0;
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("jacobi_precon_c (wrapper)", 0);
  {
    static PyObject **__pyx_pyargnames[] = {&__pyx_n_s_csr_sparse,&__pyx_n_s_precon,0};
    PyObject* values[2] = {0,0};
    if (unlikely(__pyx_kwds)) {
      Py_ssize_t kw_args;
      const Py_ssize_t pos_args = PyTuple_GET_SIZE(__pyx_args);
      switch (pos_args) {
        case  2: values[1] = PyTuple_GET_ITEM(__pyx_args, 1);
        CYTHON_FALLTHROUGH;
        case  1: values[0] = PyTuple_GET_ITEM(__pyx_args, 0);
        CYTHON_FALLTHROUGH;
        case  0: break;
        default: goto __pyx_L5_argtuple_error;
      }
      kw_args = PyDict_Size(__pyx_kwds);
      switch (pos_args) {
        case  0:
        if (likely((values[0] = __Pyx_PyDict_GetItemStr(__pyx_kwds, __pyx_n_s_csr_sparse)) != 0)) kw_args--;
        else goto __pyx_L5_argtuple_error;
        CYTHON_FALLTHROUGH;
        case  1:
        if (likely((values[1] = __Pyx_PyDict_GetItemStr(__pyx_kwds, __pyx_n_s_precon)) != 0)) kw_args--;
        else {
          __Pyx_RaiseArgtupleInvalid("jacobi_precon_c", 1, 2, 2, 1); __PYX_ERR(0, 14, __pyx_L3_error)
        }
      }
      if (unlikely(kw_args > 0)) {
        if (unlikely(__Pyx_ParseOptionalKeywords(__pyx_kwds, __pyx_pyargnames, 0, values, pos_args, "jacobi_precon_c") < 0)) __PYX_ERR(0, 14, __pyx_L3_error)
      }
    } else if (PyTuple_GET_SIZE(__pyx_args) != 2) {
      goto __pyx_L5_argtuple_error;
    } else {
      values[0] = PyTuple_GET_ITEM(__pyx_args, 0);
      values[1] = PyTuple_GET_ITEM(__pyx_args, 1);
    }
    __pyx_v_csr_sparse = values[0];
    __pyx_v_precon = ((PyArrayObject *)values[1]);
  }
  goto __pyx_L4_argument_unpacking_done;
  __pyx_L5_argtuple_error:;
  __Pyx_RaiseArgtupleInvalid("jacobi_precon_c", 1, 2, 2, PyTuple_GET_SIZE(__pyx_args)); __PYX_ERR(0, 14, __pyx_L3_error)
  __pyx_L3_error:;
  __Pyx_AddTraceback("anuga.utilities.cg_ext.jacobi_precon_c", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __Pyx_RefNannyFinishContext();
  return NULL;
  __pyx_L4_argument_unpacking_done:;
  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_precon), __pyx_ptype_5numpy_ndarray, 0, "precon", 0))) __PYX_ERR(0, 14, __pyx_L1_error)
  __pyx_r = __pyx_pf_5anuga_9utilities_6cg_ext_jacobi_precon_c(__pyx_self, __pyx_v_csr_sparse, __pyx_v_precon);
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;

  /* function exit code */
  goto __pyx_L0;
  __pyx_L1_error:;
  __pyx_r = NULL;
  __pyx_L0:;
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

static PyObject *__pyx_pf_5anuga_9utilities_6cg_ext_jacobi_precon_c(CYTHON_UNUSED PyObject *__pyx_self, PyObject *__pyx_v_csr_sparse, PyArrayObject *__pyx_v_precon) {
  int __pyx_v_M;
  CYTHON_UNUSED int __pyx_v_err;
  PyArrayObject *__pyx_v_data = 0;
  PyArrayObject *__pyx_v_colind = 0;
  PyArrayObject *__pyx_v_row_ptr = 0;
  __Pyx_LocalBuf_ND __pyx_pybuffernd_colind;
  __Pyx_Buffer __pyx_pybuffer_colind;
  __Pyx_LocalBuf_ND __pyx_pybuffernd_data;
  __Pyx_Buffer __pyx_pybuffer_data;
  __Pyx_LocalBuf_ND __pyx_pybuffernd_precon;
  __Pyx_Buffer __pyx_pybuffer_precon;
  __Pyx_LocalBuf_ND __pyx_pybuffernd_row_ptr;
  __Pyx_Buffer __pyx_pybuffer_row_ptr;
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("jacobi_precon_c", 0);
  __pyx_pybuffer_data.pybuffer.buf = NULL;
  __pyx_pybuffer_data.refcount = 0;
  __pyx_pybuffernd_data.data = NULL;
  __pyx_pybuffernd_data.rcbuffer = &__pyx_pybuffer_data;
  __pyx_pybuffer_colind.pybuffer.buf = NULL;
  __pyx_pybuffer_colind.refcount = 0;
  __pyx_pybuffernd_colind.data = NULL;
  __pyx_pybuffernd_colind.rcbuffer = &__pyx_pybuffer_colind;
  __pyx_pybuffer_row_ptr.pybuffer.buf = NULL;
  __pyx_pybuffer_row_ptr.refcount = 0;
  __pyx_pybuffernd_row_ptr.data = NULL;
  __pyx_pybuffernd_row_ptr.rcbuffer = &__pyx_pybuffer_row_ptr;
  __pyx_pybuffer_precon.pybuffer.buf = NULL;
  __pyx_pybuffer_precon.refcount = 0;
  __pyx_pybuffernd_precon.data = NULL;
  __pyx_pybuffernd_precon.rcbuffer = &__pyx_pybuffer_precon;
  {
    __Pyx_BufFmt_StackElem __pyx_stack[1];
    if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_precon.rcbuffer->pybuffer, (PyObject*)__pyx_v_precon, &__Pyx_TypeInfo_double, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack) == -1)) __PYX_ERR(0, 14, __pyx_L1_error)
  }
  __pyx_pybuffernd_precon.diminfo[0].strides = __pyx_pybuffernd_precon.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_precon.diminfo[0].shape = __pyx_pybuffernd_precon.rcbuffer->pybuffer.shape[0];
/* … */
  /* function exit code */
  __pyx_r = Py_None; __Pyx_INCREF(Py_None);
  goto __pyx_L0;
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_1);
  { PyObject *__pyx_type, *__pyx_value, *__pyx_tb;
    __Pyx_PyThreadState_declare
    __Pyx_PyThreadState_assign
    __Pyx_ErrFetch(&__pyx_type, &__pyx_value, &__pyx_tb);
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_colind.rcbuffer->pybuffer);
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_data.rcbuffer->pybuffer);
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_precon.rcbuffer->pybuffer);
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_row_ptr.rcbuffer->pybuffer);
  __Pyx_ErrRestore(__pyx_type, __pyx_value, __pyx_tb);}
  __Pyx_AddTraceback("anuga.utilities.cg_ext.jacobi_precon_c", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = NULL;
  goto __pyx_L2;
  __pyx_L0:;
  __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_colind.rcbuffer->pybuffer);
  __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_data.rcbuffer->pybuffer);
  __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_precon.rcbuffer->pybuffer);
  __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_row_ptr.rcbuffer->pybuffer);
  __pyx_L2:;
  __Pyx_XDECREF((PyObject *)__pyx_v_data);
  __Pyx_XDECREF((PyObject *)__pyx_v_colind);
  __Pyx_XDECREF((PyObject *)__pyx_v_row_ptr);
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}
/* … */
  __pyx_tuple__3 = PyTuple_Pack(7, __pyx_n_s_csr_sparse, __pyx_n_s_precon, __pyx_n_s_M, __pyx_n_s_err, __pyx_n_s_data, __pyx_n_s_colind, __pyx_n_s_row_ptr); if (unlikely(!__pyx_tuple__3)) __PYX_ERR(0, 14, __pyx_L1_error)
  __Pyx_GOTREF(__pyx_tuple__3);
  __Pyx_GIVEREF(__pyx_tuple__3);
/* … */
  __pyx_t_1 = PyCFunction_NewEx(&__pyx_mdef_5anuga_9utilities_6cg_ext_1jacobi_precon_c, NULL, __pyx_n_s_anuga_utilities_cg_ext); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 14, __pyx_L1_error)
  __Pyx_GOTREF(__pyx_t_1);
  if (PyDict_SetItem(__pyx_d, __pyx_n_s_jacobi_precon_c, __pyx_t_1) < 0) __PYX_ERR(0, 14, __pyx_L1_error)
  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
  __pyx_codeobj__4 = (PyObject*)__Pyx_PyCode_New(2, 0, 7, 0, CO_OPTIMIZED|CO_NEWLOCALS, __pyx_empty_bytes, __pyx_empty_tuple, __pyx_empty_tuple, __pyx_tuple__3, __pyx_empty_tuple, __pyx_empty_tuple, __pyx_kp_s_anuga_utilities_cg_ext_pyx, __pyx_n_s_jacobi_precon_c, 14, __pyx_empty_bytes); if (unlikely(!__pyx_codeobj__4)) __PYX_ERR(0, 14, __pyx_L1_error)
 15: 
 16:     cdef int M, err
 17:     cdef np.ndarray[double, ndim=1, mode="c"] data
 18:     cdef np.ndarray[long, ndim=1, mode="c"] colind
 19:     cdef np.ndarray[long, ndim=1, mode="c"] row_ptr
 20: 
+21:     data = csr_sparse.data
  __pyx_t_1 = __Pyx_PyObject_GetAttrStr(__pyx_v_csr_sparse, __pyx_n_s_data); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 21, __pyx_L1_error)
  __Pyx_GOTREF(__pyx_t_1);
  if (!(likely(((__pyx_t_1) == Py_None) || likely(__Pyx_TypeTest(__pyx_t_1, __pyx_ptype_5numpy_ndarray))))) __PYX_ERR(0, 21, __pyx_L1_error)
  __pyx_t_2 = ((PyArrayObject *)__pyx_t_1);
  {
    __Pyx_BufFmt_StackElem __pyx_stack[1];
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_data.rcbuffer->pybuffer);
    __pyx_t_3 = __Pyx_GetBufferAndValidate(&__pyx_pybuffernd_data.rcbuffer->pybuffer, (PyObject*)__pyx_t_2, &__Pyx_TypeInfo_double, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack);
    if (unlikely(__pyx_t_3 < 0)) {
      PyErr_Fetch(&__pyx_t_4, &__pyx_t_5, &__pyx_t_6);
      if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_data.rcbuffer->pybuffer, (PyObject*)__pyx_v_data, &__Pyx_TypeInfo_double, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack) == -1)) {
        Py_XDECREF(__pyx_t_4); Py_XDECREF(__pyx_t_5); Py_XDECREF(__pyx_t_6);
        __Pyx_RaiseBufferFallbackError();
      } else {
        PyErr_Restore(__pyx_t_4, __pyx_t_5, __pyx_t_6);
      }
      __pyx_t_4 = __pyx_t_5 = __pyx_t_6 = 0;
    }
    __pyx_pybuffernd_data.diminfo[0].strides = __pyx_pybuffernd_data.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_data.diminfo[0].shape = __pyx_pybuffernd_data.rcbuffer->pybuffer.shape[0];
    if (unlikely(__pyx_t_3 < 0)) __PYX_ERR(0, 21, __pyx_L1_error)
  }
  __pyx_t_2 = 0;
  __pyx_v_data = ((PyArrayObject *)__pyx_t_1);
  __pyx_t_1 = 0;
+22:     colind = csr_sparse.colind
  __pyx_t_1 = __Pyx_PyObject_GetAttrStr(__pyx_v_csr_sparse, __pyx_n_s_colind); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 22, __pyx_L1_error)
  __Pyx_GOTREF(__pyx_t_1);
  if (!(likely(((__pyx_t_1) == Py_None) || likely(__Pyx_TypeTest(__pyx_t_1, __pyx_ptype_5numpy_ndarray))))) __PYX_ERR(0, 22, __pyx_L1_error)
  __pyx_t_7 = ((PyArrayObject *)__pyx_t_1);
  {
    __Pyx_BufFmt_StackElem __pyx_stack[1];
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_colind.rcbuffer->pybuffer);
    __pyx_t_3 = __Pyx_GetBufferAndValidate(&__pyx_pybuffernd_colind.rcbuffer->pybuffer, (PyObject*)__pyx_t_7, &__Pyx_TypeInfo_long, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack);
    if (unlikely(__pyx_t_3 < 0)) {
      PyErr_Fetch(&__pyx_t_6, &__pyx_t_5, &__pyx_t_4);
      if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_colind.rcbuffer->pybuffer, (PyObject*)__pyx_v_colind, &__Pyx_TypeInfo_long, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack) == -1)) {
        Py_XDECREF(__pyx_t_6); Py_XDECREF(__pyx_t_5); Py_XDECREF(__pyx_t_4);
        __Pyx_RaiseBufferFallbackError();
      } else {
        PyErr_Restore(__pyx_t_6, __pyx_t_5, __pyx_t_4);
      }
      __pyx_t_6 = __pyx_t_5 = __pyx_t_4 = 0;
    }
    __pyx_pybuffernd_colind.diminfo[0].strides = __pyx_pybuffernd_colind.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_colind.diminfo[0].shape = __pyx_pybuffernd_colind.rcbuffer->pybuffer.shape[0];
    if (unlikely(__pyx_t_3 < 0)) __PYX_ERR(0, 22, __pyx_L1_error)
  }
  __pyx_t_7 = 0;
  __pyx_v_colind = ((PyArrayObject *)__pyx_t_1);
  __pyx_t_1 = 0;
+23:     row_ptr = csr_sparse.row_ptr
  __pyx_t_1 = __Pyx_PyObject_GetAttrStr(__pyx_v_csr_sparse, __pyx_n_s_row_ptr); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 23, __pyx_L1_error)
  __Pyx_GOTREF(__pyx_t_1);
  if (!(likely(((__pyx_t_1) == Py_None) || likely(__Pyx_TypeTest(__pyx_t_1, __pyx_ptype_5numpy_ndarray))))) __PYX_ERR(0, 23, __pyx_L1_error)
  __pyx_t_8 = ((PyArrayObject *)__pyx_t_1);
  {
    __Pyx_BufFmt_StackElem __pyx_stack[1];
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_row_ptr.rcbuffer->pybuffer);
    __pyx_t_3 = __Pyx_GetBufferAndValidate(&__pyx_pybuffernd_row_ptr.rcbuffer->pybuffer, (PyObject*)__pyx_t_8, &__Pyx_TypeInfo_long, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack);
    if (unlikely(__pyx_t_3 < 0)) {
      PyErr_Fetch(&__pyx_t_4, &__pyx_t_5, &__pyx_t_6);
      if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_row_ptr.rcbuffer->pybuffer, (PyObject*)__pyx_v_row_ptr, &__Pyx_TypeInfo_long, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack) == -1)) {
        Py_XDECREF(__pyx_t_4); Py_XDECREF(__pyx_t_5); Py_XDECREF(__pyx_t_6);
        __Pyx_RaiseBufferFallbackError();
      } else {
        PyErr_Restore(__pyx_t_4, __pyx_t_5, __pyx_t_6);
      }
      __pyx_t_4 = __pyx_t_5 = __pyx_t_6 = 0;
    }
    __pyx_pybuffernd_row_ptr.diminfo[0].strides = __pyx_pybuffernd_row_ptr.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_row_ptr.diminfo[0].shape = __pyx_pybuffernd_row_ptr.rcbuffer->pybuffer.shape[0];
    if (unlikely(__pyx_t_3 < 0)) __PYX_ERR(0, 23, __pyx_L1_error)
  }
  __pyx_t_8 = 0;
  __pyx_v_row_ptr = ((PyArrayObject *)__pyx_t_1);
  __pyx_t_1 = 0;
 24: 
+25:     M = row_ptr.shape[0] - 1
  __pyx_v_M = ((__pyx_v_row_ptr->dimensions[0]) - 1);
 26: 
+27:     err = _jacobi_precon_c(&data[0], &colind[0], &row_ptr[0], &precon[0], M)
  __pyx_t_9 = 0;
  __pyx_t_10 = 0;
  __pyx_t_11 = 0;
  __pyx_t_12 = 0;
  __pyx_v_err = _jacobi_precon_c((&(*__Pyx_BufPtrCContig1d(double *, __pyx_pybuffernd_data.rcbuffer->pybuffer.buf, __pyx_t_9, __pyx_pybuffernd_data.diminfo[0].strides))), (&(*__Pyx_BufPtrCContig1d(long *, __pyx_pybuffernd_colind.rcbuffer->pybuffer.buf, __pyx_t_10, __pyx_pybuffernd_colind.diminfo[0].strides))), (&(*__Pyx_BufPtrCContig1d(long *, __pyx_pybuffernd_row_ptr.rcbuffer->pybuffer.buf, __pyx_t_11, __pyx_pybuffernd_row_ptr.diminfo[0].strides))), (&(*__Pyx_BufPtrCContig1d(double *, __pyx_pybuffernd_precon.rcbuffer->pybuffer.buf, __pyx_t_12, __pyx_pybuffernd_precon.diminfo[0].strides))), __pyx_v_M);
 28: 
+29: def cg_solve_c(object csr_sparse,\
/* Python wrapper */
static PyObject *__pyx_pw_5anuga_9utilities_6cg_ext_3cg_solve_c(PyObject *__pyx_self, PyObject *__pyx_args, PyObject *__pyx_kwds); /*proto*/
static PyMethodDef __pyx_mdef_5anuga_9utilities_6cg_ext_3cg_solve_c = {"cg_solve_c", (PyCFunction)(void*)(PyCFunctionWithKeywords)__pyx_pw_5anuga_9utilities_6cg_ext_3cg_solve_c, METH_VARARGS|METH_KEYWORDS, 0};
static PyObject *__pyx_pw_5anuga_9utilities_6cg_ext_3cg_solve_c(PyObject *__pyx_self, PyObject *__pyx_args, PyObject *__pyx_kwds) {
  PyObject *__pyx_v_csr_sparse = 0;
  PyArrayObject *__pyx_v_x0 = 0;
  PyArrayObject *__pyx_v_b = 0;
  int __pyx_v_imax;
  double __pyx_v_tol;
  double __pyx_v_a_tol;
  CYTHON_UNUSED int __pyx_v_bcols;
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("cg_solve_c (wrapper)", 0);
  {
    static PyObject **__pyx_pyargnames[] = {&__pyx_n_s_csr_sparse,&__pyx_n_s_x0,&__pyx_n_s_b,&__pyx_n_s_imax,&__pyx_n_s_tol,&__pyx_n_s_a_tol,&__pyx_n_s_bcols,0};
    PyObject* values[7] = {0,0,0,0,0,0,0};
    if (unlikely(__pyx_kwds)) {
      Py_ssize_t kw_args;
      const Py_ssize_t pos_args = PyTuple_GET_SIZE(__pyx_args);
      switch (pos_args) {
        case  7: values[6] = PyTuple_GET_ITEM(__pyx_args, 6);
        CYTHON_FALLTHROUGH;
        case  6: values[5] = PyTuple_GET_ITEM(__pyx_args, 5);
        CYTHON_FALLTHROUGH;
        case  5: values[4] = PyTuple_GET_ITEM(__pyx_args, 4);
        CYTHON_FALLTHROUGH;
        case  4: values[3] = PyTuple_GET_ITEM(__pyx_args, 3);
        CYTHON_FALLTHROUGH;
        case  3: values[2] = PyTuple_GET_ITEM(__pyx_args, 2);
        CYTHON_FALLTHROUGH;
        case  2: values[1] = PyTuple_GET_ITEM(__pyx_args, 1);
        CYTHON_FALLTHROUGH;
        case  1: values[0] = PyTuple_GET_ITEM(__pyx_args, 0);
        CYTHON_FALLTHROUGH;
        case  0: break;
        default: goto __pyx_L5_argtuple_error;
      }
      kw_args = PyDict_Size(__pyx_kwds);
      switch (pos_args) {
        case  0:
        if (likely((values[0] = __Pyx_PyDict_GetItemStr(__pyx_kwds, __pyx_n_s_csr_sparse)) != 0)) kw_args--;
        else goto __pyx_L5_argtuple_error;
        CYTHON_FALLTHROUGH;
        case  1:
        if (likely((values[1] = __Pyx_PyDict_GetItemStr(__pyx_kwds, __pyx_n_s_x0)) != 0)) kw_args--;
        else {
          __Pyx_RaiseArgtupleInvalid("cg_solve_c", 1, 7, 7, 1); __PYX_ERR(0, 29, __pyx_L3_error)
        }
        CYTHON_FALLTHROUGH;
        case  2:
        if (likely((values[2] = __Pyx_PyDict_GetItemStr(__pyx_kwds, __pyx_n_s_b)) != 0)) kw_args--;
        else {
          __Pyx_RaiseArgtupleInvalid("cg_solve_c", 1, 7, 7, 2); __PYX_ERR(0, 29, __pyx_L3_error)
        }
        CYTHON_FALLTHROUGH;
        case  3:
        if (likely((values[3] = __Pyx_PyDict_GetItemStr(__pyx_kwds, __pyx_n_s_imax)) != 0)) kw_args--;
        else {
          __Pyx_RaiseArgtupleInvalid("cg_solve_c", 1, 7, 7, 3); __PYX_ERR(0, 29, __pyx_L3_error)
        }
        CYTHON_FALLTHROUGH;
        case  4:
        if (likely((values[4] = __Pyx_PyDict_GetItemStr(__pyx_kwds, __pyx_n_s_tol)) != 0)) kw_args--;
        else {
          __Pyx_RaiseArgtupleInvalid("cg_solve_c", 1, 7, 7, 4); __PYX_ERR(0, 29, __pyx_L3_error)
        }
        CYTHON_FALLTHROUGH;
        case  5:
        if (likely((values[5] = __Pyx_PyDict_GetItemStr(__pyx_kwds, __pyx_n_s_a_tol)) != 0)) kw_args--;
        else {
          __Pyx_RaiseArgtupleInvalid("cg_solve_c", 1, 7, 7, 5); __PYX_ERR(0, 29, __pyx_L3_error)
        }
        CYTHON_FALLTHROUGH;
        case  6:
        if (likely((values[6] = __Pyx_PyDict_GetItemStr(__pyx_kwds, __pyx_n_s_bcols)) != 0)) kw_args--;
        else {
          __Pyx_RaiseArgtupleInvalid("cg_solve_c", 1, 7, 7, 6); __PYX_ERR(0, 29, __pyx_L3_error)
        }
      }
      if (unlikely(kw_args > 0)) {
        if (unlikely(__Pyx_ParseOptionalKeywords(__pyx_kwds, __pyx_pyargnames, 0, values, pos_args, "cg_solve_c") < 0)) __PYX_ERR(0, 29, __pyx_L3_error)
      }
    } else if (PyTuple_GET_SIZE(__pyx_args) != 7) {
      goto __pyx_L5_argtuple_error;
    } else {
      values[0] = PyTuple_GET_ITEM(__pyx_args, 0);
      values[1] = PyTuple_GET_ITEM(__pyx_args, 1);
      values[2] = PyTuple_GET_ITEM(__pyx_args, 2);
      values[3] = PyTuple_GET_ITEM(__pyx_args, 3);
      values[4] = PyTuple_GET_ITEM(__pyx_args, 4);
      values[5] = PyTuple_GET_ITEM(__pyx_args, 5);
      values[6] = PyTuple_GET_ITEM(__pyx_args, 6);
    }
    __pyx_v_csr_sparse = values[0];
    __pyx_v_x0 = ((PyArrayObject *)values[1]);
    __pyx_v_b = ((PyArrayObject *)values[2]);
    __pyx_v_imax = __Pyx_PyInt_As_int(values[3]); if (unlikely((__pyx_v_imax == (int)-1) && PyErr_Occurred())) __PYX_ERR(0, 32, __pyx_L3_error)
    __pyx_v_tol = __pyx_PyFloat_AsDouble(values[4]); if (unlikely((__pyx_v_tol == (double)-1) && PyErr_Occurred())) __PYX_ERR(0, 33, __pyx_L3_error)
    __pyx_v_a_tol = __pyx_PyFloat_AsDouble(values[5]); if (unlikely((__pyx_v_a_tol == (double)-1) && PyErr_Occurred())) __PYX_ERR(0, 34, __pyx_L3_error)
    __pyx_v_bcols = __Pyx_PyInt_As_int(values[6]); if (unlikely((__pyx_v_bcols == (int)-1) && PyErr_Occurred())) __PYX_ERR(0, 35, __pyx_L3_error)
  }
  goto __pyx_L4_argument_unpacking_done;
  __pyx_L5_argtuple_error:;
  __Pyx_RaiseArgtupleInvalid("cg_solve_c", 1, 7, 7, PyTuple_GET_SIZE(__pyx_args)); __PYX_ERR(0, 29, __pyx_L3_error)
  __pyx_L3_error:;
  __Pyx_AddTraceback("anuga.utilities.cg_ext.cg_solve_c", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __Pyx_RefNannyFinishContext();
  return NULL;
  __pyx_L4_argument_unpacking_done:;
  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_x0), __pyx_ptype_5numpy_ndarray, 0, "x0", 0))) __PYX_ERR(0, 30, __pyx_L1_error)
  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_b), __pyx_ptype_5numpy_ndarray, 0, "b", 0))) __PYX_ERR(0, 31, __pyx_L1_error)
  __pyx_r = __pyx_pf_5anuga_9utilities_6cg_ext_2cg_solve_c(__pyx_self, __pyx_v_csr_sparse, __pyx_v_x0, __pyx_v_b, __pyx_v_imax, __pyx_v_tol, __pyx_v_a_tol, __pyx_v_bcols);
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;

  /* function exit code */
  goto __pyx_L0;
  __pyx_L1_error:;
  __pyx_r = NULL;
  __pyx_L0:;
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

static PyObject *__pyx_pf_5anuga_9utilities_6cg_ext_2cg_solve_c(CYTHON_UNUSED PyObject *__pyx_self, PyObject *__pyx_v_csr_sparse, PyArrayObject *__pyx_v_x0, PyArrayObject *__pyx_v_b, int __pyx_v_imax, double __pyx_v_tol, double __pyx_v_a_tol, CYTHON_UNUSED int __pyx_v_bcols) {
  int __pyx_v_M;
  int __pyx_v_err;
  PyArrayObject *__pyx_v_data = 0;
  PyArrayObject *__pyx_v_colind = 0;
  PyArrayObject *__pyx_v_row_ptr = 0;
  __Pyx_LocalBuf_ND __pyx_pybuffernd_b;
  __Pyx_Buffer __pyx_pybuffer_b;
  __Pyx_LocalBuf_ND __pyx_pybuffernd_colind;
  __Pyx_Buffer __pyx_pybuffer_colind;
  __Pyx_LocalBuf_ND __pyx_pybuffernd_data;
  __Pyx_Buffer __pyx_pybuffer_data;
  __Pyx_LocalBuf_ND __pyx_pybuffernd_row_ptr;
  __Pyx_Buffer __pyx_pybuffer_row_ptr;
  __Pyx_LocalBuf_ND __pyx_pybuffernd_x0;
  __Pyx_Buffer __pyx_pybuffer_x0;
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("cg_solve_c", 0);
  __pyx_pybuffer_data.pybuffer.buf = NULL;
  __pyx_pybuffer_data.refcount = 0;
  __pyx_pybuffernd_data.data = NULL;
  __pyx_pybuffernd_data.rcbuffer = &__pyx_pybuffer_data;
  __pyx_pybuffer_colind.pybuffer.buf = NULL;
  __pyx_pybuffer_colind.refcount = 0;
  __pyx_pybuffernd_colind.data = NULL;
  __pyx_pybuffernd_colind.rcbuffer = &__pyx_pybuffer_colind;
  __pyx_pybuffer_row_ptr.pybuffer.buf = NULL;
  __pyx_pybuffer_row_ptr.refcount = 0;
  __pyx_pybuffernd_row_ptr.data = NULL;
  __pyx_pybuffernd_row_ptr.rcbuffer = &__pyx_pybuffer_row_ptr;
  __pyx_pybuffer_x0.pybuffer.buf = NULL;
  __pyx_pybuffer_x0.refcount = 0;
  __pyx_pybuffernd_x0.data = NULL;
  __pyx_pybuffernd_x0.rcbuffer = &__pyx_pybuffer_x0;
  __pyx_pybuffer_b.pybuffer.buf = NULL;
  __pyx_pybuffer_b.refcount = 0;
  __pyx_pybuffernd_b.data = NULL;
  __pyx_pybuffernd_b.rcbuffer = &__pyx_pybuffer_b;
  {
    __Pyx_BufFmt_StackElem __pyx_stack[1];
    if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_x0.rcbuffer->pybuffer, (PyObject*)__pyx_v_x0, &__Pyx_TypeInfo_double, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack) == -1)) __PYX_ERR(0, 29, __pyx_L1_error)
  }
  __pyx_pybuffernd_x0.diminfo[0].strides = __pyx_pybuffernd_x0.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_x0.diminfo[0].shape = __pyx_pybuffernd_x0.rcbuffer->pybuffer.shape[0];
  {
    __Pyx_BufFmt_StackElem __pyx_stack[1];
    if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_b.rcbuffer->pybuffer, (PyObject*)__pyx_v_b, &__Pyx_TypeInfo_double, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack) == -1)) __PYX_ERR(0, 29, __pyx_L1_error)
  }
  __pyx_pybuffernd_b.diminfo[0].strides = __pyx_pybuffernd_b.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_b.diminfo[0].shape = __pyx_pybuffernd_b.rcbuffer->pybuffer.shape[0];
/* … */
  /* function exit code */
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_1);
  { PyObject *__pyx_type, *__pyx_value, *__pyx_tb;
    __Pyx_PyThreadState_declare
    __Pyx_PyThreadState_assign
    __Pyx_ErrFetch(&__pyx_type, &__pyx_value, &__pyx_tb);
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_b.rcbuffer->pybuffer);
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_colind.rcbuffer->pybuffer);
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_data.rcbuffer->pybuffer);
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_row_ptr.rcbuffer->pybuffer);
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_x0.rcbuffer->pybuffer);
  __Pyx_ErrRestore(__pyx_type, __pyx_value, __pyx_tb);}
  __Pyx_AddTraceback("anuga.utilities.cg_ext.cg_solve_c", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = NULL;
  goto __pyx_L2;
  __pyx_L0:;
  __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_b.rcbuffer->pybuffer);
  __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_colind.rcbuffer->pybuffer);
  __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_data.rcbuffer->pybuffer);
  __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_row_ptr.rcbuffer->pybuffer);
  __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_x0.rcbuffer->pybuffer);
  __pyx_L2:;
  __Pyx_XDECREF((PyObject *)__pyx_v_data);
  __Pyx_XDECREF((PyObject *)__pyx_v_colind);
  __Pyx_XDECREF((PyObject *)__pyx_v_row_ptr);
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}
/* … */
  __pyx_tuple__5 = PyTuple_Pack(12, __pyx_n_s_csr_sparse, __pyx_n_s_x0, __pyx_n_s_b, __pyx_n_s_imax, __pyx_n_s_tol, __pyx_n_s_a_tol, __pyx_n_s_bcols, __pyx_n_s_M, __pyx_n_s_err, __pyx_n_s_data, __pyx_n_s_colind, __pyx_n_s_row_ptr); if (unlikely(!__pyx_tuple__5)) __PYX_ERR(0, 29, __pyx_L1_error)
  __Pyx_GOTREF(__pyx_tuple__5);
  __Pyx_GIVEREF(__pyx_tuple__5);
/* … */
  __pyx_t_1 = PyCFunction_NewEx(&__pyx_mdef_5anuga_9utilities_6cg_ext_3cg_solve_c, NULL, __pyx_n_s_anuga_utilities_cg_ext); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 29, __pyx_L1_error)
  __Pyx_GOTREF(__pyx_t_1);
  if (PyDict_SetItem(__pyx_d, __pyx_n_s_cg_solve_c, __pyx_t_1) < 0) __PYX_ERR(0, 29, __pyx_L1_error)
  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
  __pyx_codeobj__6 = (PyObject*)__Pyx_PyCode_New(7, 0, 12, 0, CO_OPTIMIZED|CO_NEWLOCALS, __pyx_empty_bytes, __pyx_empty_tuple, __pyx_empty_tuple, __pyx_tuple__5, __pyx_empty_tuple, __pyx_empty_tuple, __pyx_kp_s_anuga_utilities_cg_ext_pyx, __pyx_n_s_cg_solve_c, 29, __pyx_empty_bytes); if (unlikely(!__pyx_codeobj__6)) __PYX_ERR(0, 29, __pyx_L1_error)
 30:                 np.ndarray[double, ndim=1, mode="c"] x0 not None,\
 31:                 np.ndarray[double, ndim=1, mode="c"] b not None,\
 32:                 int imax,\
 33:                 double tol,\
 34:                 double a_tol,\
 35:                 int bcols):
 36: 
 37:     cdef int M, err
 38:     cdef np.ndarray[double, ndim=1, mode="c"] data
 39:     cdef np.ndarray[long, ndim=1, mode="c"] colind
 40:     cdef np.ndarray[long, ndim=1, mode="c"] row_ptr
 41: 
+42:     data = csr_sparse.data
  __pyx_t_1 = __Pyx_PyObject_GetAttrStr(__pyx_v_csr_sparse, __pyx_n_s_data); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 42, __pyx_L1_error)
  __Pyx_GOTREF(__pyx_t_1);
  if (!(likely(((__pyx_t_1) == Py_None) || likely(__Pyx_TypeTest(__pyx_t_1, __pyx_ptype_5numpy_ndarray))))) __PYX_ERR(0, 42, __pyx_L1_error)
  __pyx_t_2 = ((PyArrayObject *)__pyx_t_1);
  {
    __Pyx_BufFmt_StackElem __pyx_stack[1];
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_data.rcbuffer->pybuffer);
    __pyx_t_3 = __Pyx_GetBufferAndValidate(&__pyx_pybuffernd_data.rcbuffer->pybuffer, (PyObject*)__pyx_t_2, &__Pyx_TypeInfo_double, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack);
    if (unlikely(__pyx_t_3 < 0)) {
      PyErr_Fetch(&__pyx_t_4, &__pyx_t_5, &__pyx_t_6);
      if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_data.rcbuffer->pybuffer, (PyObject*)__pyx_v_data, &__Pyx_TypeInfo_double, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack) == -1)) {
        Py_XDECREF(__pyx_t_4); Py_XDECREF(__pyx_t_5); Py_XDECREF(__pyx_t_6);
        __Pyx_RaiseBufferFallbackError();
      } else {
        PyErr_Restore(__pyx_t_4, __pyx_t_5, __pyx_t_6);
      }
      __pyx_t_4 = __pyx_t_5 = __pyx_t_6 = 0;
    }
    __pyx_pybuffernd_data.diminfo[0].strides = __pyx_pybuffernd_data.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_data.diminfo[0].shape = __pyx_pybuffernd_data.rcbuffer->pybuffer.shape[0];
    if (unlikely(__pyx_t_3 < 0)) __PYX_ERR(0, 42, __pyx_L1_error)
  }
  __pyx_t_2 = 0;
  __pyx_v_data = ((PyArrayObject *)__pyx_t_1);
  __pyx_t_1 = 0;
+43:     colind = csr_sparse.colind
  __pyx_t_1 = __Pyx_PyObject_GetAttrStr(__pyx_v_csr_sparse, __pyx_n_s_colind); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 43, __pyx_L1_error)
  __Pyx_GOTREF(__pyx_t_1);
  if (!(likely(((__pyx_t_1) == Py_None) || likely(__Pyx_TypeTest(__pyx_t_1, __pyx_ptype_5numpy_ndarray))))) __PYX_ERR(0, 43, __pyx_L1_error)
  __pyx_t_7 = ((PyArrayObject *)__pyx_t_1);
  {
    __Pyx_BufFmt_StackElem __pyx_stack[1];
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_colind.rcbuffer->pybuffer);
    __pyx_t_3 = __Pyx_GetBufferAndValidate(&__pyx_pybuffernd_colind.rcbuffer->pybuffer, (PyObject*)__pyx_t_7, &__Pyx_TypeInfo_long, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack);
    if (unlikely(__pyx_t_3 < 0)) {
      PyErr_Fetch(&__pyx_t_6, &__pyx_t_5, &__pyx_t_4);
      if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_colind.rcbuffer->pybuffer, (PyObject*)__pyx_v_colind, &__Pyx_TypeInfo_long, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack) == -1)) {
        Py_XDECREF(__pyx_t_6); Py_XDECREF(__pyx_t_5); Py_XDECREF(__pyx_t_4);
        __Pyx_RaiseBufferFallbackError();
      } else {
        PyErr_Restore(__pyx_t_6, __pyx_t_5, __pyx_t_4);
      }
      __pyx_t_6 = __pyx_t_5 = __pyx_t_4 = 0;
    }
    __pyx_pybuffernd_colind.diminfo[0].strides = __pyx_pybuffernd_colind.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_colind.diminfo[0].shape = __pyx_pybuffernd_colind.rcbuffer->pybuffer.shape[0];
    if (unlikely(__pyx_t_3 < 0)) __PYX_ERR(0, 43, __pyx_L1_error)
  }
  __pyx_t_7 = 0;
  __pyx_v_colind = ((PyArrayObject *)__pyx_t_1);
  __pyx_t_1 = 0;
+44:     row_ptr = csr_sparse.row_ptr
  __pyx_t_1 = __Pyx_PyObject_GetAttrStr(__pyx_v_csr_sparse, __pyx_n_s_row_ptr); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 44, __pyx_L1_error)
  __Pyx_GOTREF(__pyx_t_1);
  if (!(likely(((__pyx_t_1) == Py_None) || likely(__Pyx_TypeTest(__pyx_t_1, __pyx_ptype_5numpy_ndarray))))) __PYX_ERR(0, 44, __pyx_L1_error)
  __pyx_t_8 = ((PyArrayObject *)__pyx_t_1);
  {
    __Pyx_BufFmt_StackElem __pyx_stack[1];
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_row_ptr.rcbuffer->pybuffer);
    __pyx_t_3 = __Pyx_GetBufferAndValidate(&__pyx_pybuffernd_row_ptr.rcbuffer->pybuffer, (PyObject*)__pyx_t_8, &__Pyx_TypeInfo_long, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack);
    if (unlikely(__pyx_t_3 < 0)) {
      PyErr_Fetch(&__pyx_t_4, &__pyx_t_5, &__pyx_t_6);
      if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_row_ptr.rcbuffer->pybuffer, (PyObject*)__pyx_v_row_ptr, &__Pyx_TypeInfo_long, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack) == -1)) {
        Py_XDECREF(__pyx_t_4); Py_XDECREF(__pyx_t_5); Py_XDECREF(__pyx_t_6);
        __Pyx_RaiseBufferFallbackError();
      } else {
        PyErr_Restore(__pyx_t_4, __pyx_t_5, __pyx_t_6);
      }
      __pyx_t_4 = __pyx_t_5 = __pyx_t_6 = 0;
    }
    __pyx_pybuffernd_row_ptr.diminfo[0].strides = __pyx_pybuffernd_row_ptr.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_row_ptr.diminfo[0].shape = __pyx_pybuffernd_row_ptr.rcbuffer->pybuffer.shape[0];
    if (unlikely(__pyx_t_3 < 0)) __PYX_ERR(0, 44, __pyx_L1_error)
  }
  __pyx_t_8 = 0;
  __pyx_v_row_ptr = ((PyArrayObject *)__pyx_t_1);
  __pyx_t_1 = 0;
 45: 
+46:     M = row_ptr.shape[0] - 1
  __pyx_v_M = ((__pyx_v_row_ptr->dimensions[0]) - 1);
 47: 
+48:     err = _cg_solve_c(&data[0],\
  __pyx_t_9 = 0;
/* … */
  __pyx_v_err = _cg_solve_c((&(*__Pyx_BufPtrCContig1d(double *, __pyx_pybuffernd_data.rcbuffer->pybuffer.buf, __pyx_t_9, __pyx_pybuffernd_data.diminfo[0].strides))), (&(*__Pyx_BufPtrCContig1d(long *, __pyx_pybuffernd_colind.rcbuffer->pybuffer.buf, __pyx_t_10, __pyx_pybuffernd_colind.diminfo[0].strides))), (&(*__Pyx_BufPtrCContig1d(long *, __pyx_pybuffernd_row_ptr.rcbuffer->pybuffer.buf, __pyx_t_11, __pyx_pybuffernd_row_ptr.diminfo[0].strides))), (&(*__Pyx_BufPtrCContig1d(double *, __pyx_pybuffernd_b.rcbuffer->pybuffer.buf, __pyx_t_12, __pyx_pybuffernd_b.diminfo[0].strides))), (&(*__Pyx_BufPtrCContig1d(double *, __pyx_pybuffernd_x0.rcbuffer->pybuffer.buf, __pyx_t_13, __pyx_pybuffernd_x0.diminfo[0].strides))), __pyx_v_imax, __pyx_v_tol, __pyx_v_a_tol, __pyx_v_M);
+49:                     &colind[0],\
  __pyx_t_10 = 0;
+50:                     &row_ptr[0],\
  __pyx_t_11 = 0;
+51:                     &b[0],\
  __pyx_t_12 = 0;
+52:                     &x0[0],\
  __pyx_t_13 = 0;
 53:                     imax,\
 54:                     tol,\
 55:                     a_tol,\
 56:                     M)
 57: 
+58:     return err
  __Pyx_XDECREF(__pyx_r);
  __pyx_t_1 = __Pyx_PyInt_From_int(__pyx_v_err); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 58, __pyx_L1_error)
  __Pyx_GOTREF(__pyx_t_1);
  __pyx_r = __pyx_t_1;
  __pyx_t_1 = 0;
  goto __pyx_L0;
 59: 
+60: def cg_solve_c_precon(object csr_sparse,\
/* Python wrapper */
static PyObject *__pyx_pw_5anuga_9utilities_6cg_ext_5cg_solve_c_precon(PyObject *__pyx_self, PyObject *__pyx_args, PyObject *__pyx_kwds); /*proto*/
static PyMethodDef __pyx_mdef_5anuga_9utilities_6cg_ext_5cg_solve_c_precon = {"cg_solve_c_precon", (PyCFunction)(void*)(PyCFunctionWithKeywords)__pyx_pw_5anuga_9utilities_6cg_ext_5cg_solve_c_precon, METH_VARARGS|METH_KEYWORDS, 0};
static PyObject *__pyx_pw_5anuga_9utilities_6cg_ext_5cg_solve_c_precon(PyObject *__pyx_self, PyObject *__pyx_args, PyObject *__pyx_kwds) {
  PyObject *__pyx_v_csr_sparse = 0;
  PyArrayObject *__pyx_v_x0 = 0;
  PyArrayObject *__pyx_v_b = 0;
  int __pyx_v_imax;
  double __pyx_v_tol;
  double __pyx_v_a_tol;
  CYTHON_UNUSED int __pyx_v_bcols;
  PyArrayObject *__pyx_v_precon = 0;
  PyObject *__pyx_r = 0;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("cg_solve_c_precon (wrapper)", 0);
  {
    static PyObject **__pyx_pyargnames[] = {&__pyx_n_s_csr_sparse,&__pyx_n_s_x0,&__pyx_n_s_b,&__pyx_n_s_imax,&__pyx_n_s_tol,&__pyx_n_s_a_tol,&__pyx_n_s_bcols,&__pyx_n_s_precon,0};
    PyObject* values[8] = {0,0,0,0,0,0,0,0};
    if (unlikely(__pyx_kwds)) {
      Py_ssize_t kw_args;
      const Py_ssize_t pos_args = PyTuple_GET_SIZE(__pyx_args);
      switch (pos_args) {
        case  8: values[7] = PyTuple_GET_ITEM(__pyx_args, 7);
        CYTHON_FALLTHROUGH;
        case  7: values[6] = PyTuple_GET_ITEM(__pyx_args, 6);
        CYTHON_FALLTHROUGH;
        case  6: values[5] = PyTuple_GET_ITEM(__pyx_args, 5);
        CYTHON_FALLTHROUGH;
        case  5: values[4] = PyTuple_GET_ITEM(__pyx_args, 4);
        CYTHON_FALLTHROUGH;
        case  4: values[3] = PyTuple_GET_ITEM(__pyx_args, 3);
        CYTHON_FALLTHROUGH;
        case  3: values[2] = PyTuple_GET_ITEM(__pyx_args, 2);
        CYTHON_FALLTHROUGH;
        case  2: values[1] = PyTuple_GET_ITEM(__pyx_args, 1);
        CYTHON_FALLTHROUGH;
        case  1: values[0] = PyTuple_GET_ITEM(__pyx_args, 0);
        CYTHON_FALLTHROUGH;
        case  0: break;
        default: goto __pyx_L5_argtuple_error;
      }
      kw_args = PyDict_Size(__pyx_kwds);
      switch (pos_args) {
        case  0:
        if (likely((values[0] = __Pyx_PyDict_GetItemStr(__pyx_kwds, __pyx_n_s_csr_sparse)) != 0)) kw_args--;
        else goto __pyx_L5_argtuple_error;
        CYTHON_FALLTHROUGH;
        case  1:
        if (likely((values[1] = __Pyx_PyDict_GetItemStr(__pyx_kwds, __pyx_n_s_x0)) != 0)) kw_args--;
        else {
          __Pyx_RaiseArgtupleInvalid("cg_solve_c_precon", 1, 8, 8, 1); __PYX_ERR(0, 60, __pyx_L3_error)
        }
        CYTHON_FALLTHROUGH;
        case  2:
        if (likely((values[2] = __Pyx_PyDict_GetItemStr(__pyx_kwds, __pyx_n_s_b)) != 0)) kw_args--;
        else {
          __Pyx_RaiseArgtupleInvalid("cg_solve_c_precon", 1, 8, 8, 2); __PYX_ERR(0, 60, __pyx_L3_error)
        }
        CYTHON_FALLTHROUGH;
        case  3:
        if (likely((values[3] = __Pyx_PyDict_GetItemStr(__pyx_kwds, __pyx_n_s_imax)) != 0)) kw_args--;
        else {
          __Pyx_RaiseArgtupleInvalid("cg_solve_c_precon", 1, 8, 8, 3); __PYX_ERR(0, 60, __pyx_L3_error)
        }
        CYTHON_FALLTHROUGH;
        case  4:
        if (likely((values[4] = __Pyx_PyDict_GetItemStr(__pyx_kwds, __pyx_n_s_tol)) != 0)) kw_args--;
        else {
          __Pyx_RaiseArgtupleInvalid("cg_solve_c_precon", 1, 8, 8, 4); __PYX_ERR(0, 60, __pyx_L3_error)
        }
        CYTHON_FALLTHROUGH;
        case  5:
        if (likely((values[5] = __Pyx_PyDict_GetItemStr(__pyx_kwds, __pyx_n_s_a_tol)) != 0)) kw_args--;
        else {
          __Pyx_RaiseArgtupleInvalid("cg_solve_c_precon", 1, 8, 8, 5); __PYX_ERR(0, 60, __pyx_L3_error)
        }
        CYTHON_FALLTHROUGH;
        case  6:
        if (likely((values[6] = __Pyx_PyDict_GetItemStr(__pyx_kwds, __pyx_n_s_bcols)) != 0)) kw_args--;
        else {
          __Pyx_RaiseArgtupleInvalid("cg_solve_c_precon", 1, 8, 8, 6); __PYX_ERR(0, 60, __pyx_L3_error)
        }
        CYTHON_FALLTHROUGH;
        case  7:
        if (likely((values[7] = __Pyx_PyDict_GetItemStr(__pyx_kwds, __pyx_n_s_precon)) != 0)) kw_args--;
        else {
          __Pyx_RaiseArgtupleInvalid("cg_solve_c_precon", 1, 8, 8, 7); __PYX_ERR(0, 60, __pyx_L3_error)
        }
      }
      if (unlikely(kw_args > 0)) {
        if (unlikely(__Pyx_ParseOptionalKeywords(__pyx_kwds, __pyx_pyargnames, 0, values, pos_args, "cg_solve_c_precon") < 0)) __PYX_ERR(0, 60, __pyx_L3_error)
      }
    } else if (PyTuple_GET_SIZE(__pyx_args) != 8) {
      goto __pyx_L5_argtuple_error;
    } else {
      values[0] = PyTuple_GET_ITEM(__pyx_args, 0);
      values[1] = PyTuple_GET_ITEM(__pyx_args, 1);
      values[2] = PyTuple_GET_ITEM(__pyx_args, 2);
      values[3] = PyTuple_GET_ITEM(__pyx_args, 3);
      values[4] = PyTuple_GET_ITEM(__pyx_args, 4);
      values[5] = PyTuple_GET_ITEM(__pyx_args, 5);
      values[6] = PyTuple_GET_ITEM(__pyx_args, 6);
      values[7] = PyTuple_GET_ITEM(__pyx_args, 7);
    }
    __pyx_v_csr_sparse = values[0];
    __pyx_v_x0 = ((PyArrayObject *)values[1]);
    __pyx_v_b = ((PyArrayObject *)values[2]);
    __pyx_v_imax = __Pyx_PyInt_As_int(values[3]); if (unlikely((__pyx_v_imax == (int)-1) && PyErr_Occurred())) __PYX_ERR(0, 63, __pyx_L3_error)
    __pyx_v_tol = __pyx_PyFloat_AsDouble(values[4]); if (unlikely((__pyx_v_tol == (double)-1) && PyErr_Occurred())) __PYX_ERR(0, 64, __pyx_L3_error)
    __pyx_v_a_tol = __pyx_PyFloat_AsDouble(values[5]); if (unlikely((__pyx_v_a_tol == (double)-1) && PyErr_Occurred())) __PYX_ERR(0, 65, __pyx_L3_error)
    __pyx_v_bcols = __Pyx_PyInt_As_int(values[6]); if (unlikely((__pyx_v_bcols == (int)-1) && PyErr_Occurred())) __PYX_ERR(0, 66, __pyx_L3_error)
    __pyx_v_precon = ((PyArrayObject *)values[7]);
  }
  goto __pyx_L4_argument_unpacking_done;
  __pyx_L5_argtuple_error:;
  __Pyx_RaiseArgtupleInvalid("cg_solve_c_precon", 1, 8, 8, PyTuple_GET_SIZE(__pyx_args)); __PYX_ERR(0, 60, __pyx_L3_error)
  __pyx_L3_error:;
  __Pyx_AddTraceback("anuga.utilities.cg_ext.cg_solve_c_precon", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __Pyx_RefNannyFinishContext();
  return NULL;
  __pyx_L4_argument_unpacking_done:;
  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_x0), __pyx_ptype_5numpy_ndarray, 0, "x0", 0))) __PYX_ERR(0, 61, __pyx_L1_error)
  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_b), __pyx_ptype_5numpy_ndarray, 0, "b", 0))) __PYX_ERR(0, 62, __pyx_L1_error)
  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_precon), __pyx_ptype_5numpy_ndarray, 0, "precon", 0))) __PYX_ERR(0, 67, __pyx_L1_error)
  __pyx_r = __pyx_pf_5anuga_9utilities_6cg_ext_4cg_solve_c_precon(__pyx_self, __pyx_v_csr_sparse, __pyx_v_x0, __pyx_v_b, __pyx_v_imax, __pyx_v_tol, __pyx_v_a_tol, __pyx_v_bcols, __pyx_v_precon);
  int __pyx_lineno = 0;
  const char *__pyx_filename = NULL;
  int __pyx_clineno = 0;

  /* function exit code */
  goto __pyx_L0;
  __pyx_L1_error:;
  __pyx_r = NULL;
  __pyx_L0:;
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}

static PyObject *__pyx_pf_5anuga_9utilities_6cg_ext_4cg_solve_c_precon(CYTHON_UNUSED PyObject *__pyx_self, PyObject *__pyx_v_csr_sparse, PyArrayObject *__pyx_v_x0, PyArrayObject *__pyx_v_b, int __pyx_v_imax, double __pyx_v_tol, double __pyx_v_a_tol, CYTHON_UNUSED int __pyx_v_bcols, PyArrayObject *__pyx_v_precon) {
  int __pyx_v_M;
  int __pyx_v_err;
  PyArrayObject *__pyx_v_data = 0;
  PyArrayObject *__pyx_v_colind = 0;
  PyArrayObject *__pyx_v_row_ptr = 0;
  __Pyx_LocalBuf_ND __pyx_pybuffernd_b;
  __Pyx_Buffer __pyx_pybuffer_b;
  __Pyx_LocalBuf_ND __pyx_pybuffernd_colind;
  __Pyx_Buffer __pyx_pybuffer_colind;
  __Pyx_LocalBuf_ND __pyx_pybuffernd_data;
  __Pyx_Buffer __pyx_pybuffer_data;
  __Pyx_LocalBuf_ND __pyx_pybuffernd_precon;
  __Pyx_Buffer __pyx_pybuffer_precon;
  __Pyx_LocalBuf_ND __pyx_pybuffernd_row_ptr;
  __Pyx_Buffer __pyx_pybuffer_row_ptr;
  __Pyx_LocalBuf_ND __pyx_pybuffernd_x0;
  __Pyx_Buffer __pyx_pybuffer_x0;
  PyObject *__pyx_r = NULL;
  __Pyx_RefNannyDeclarations
  __Pyx_RefNannySetupContext("cg_solve_c_precon", 0);
  __pyx_pybuffer_data.pybuffer.buf = NULL;
  __pyx_pybuffer_data.refcount = 0;
  __pyx_pybuffernd_data.data = NULL;
  __pyx_pybuffernd_data.rcbuffer = &__pyx_pybuffer_data;
  __pyx_pybuffer_colind.pybuffer.buf = NULL;
  __pyx_pybuffer_colind.refcount = 0;
  __pyx_pybuffernd_colind.data = NULL;
  __pyx_pybuffernd_colind.rcbuffer = &__pyx_pybuffer_colind;
  __pyx_pybuffer_row_ptr.pybuffer.buf = NULL;
  __pyx_pybuffer_row_ptr.refcount = 0;
  __pyx_pybuffernd_row_ptr.data = NULL;
  __pyx_pybuffernd_row_ptr.rcbuffer = &__pyx_pybuffer_row_ptr;
  __pyx_pybuffer_x0.pybuffer.buf = NULL;
  __pyx_pybuffer_x0.refcount = 0;
  __pyx_pybuffernd_x0.data = NULL;
  __pyx_pybuffernd_x0.rcbuffer = &__pyx_pybuffer_x0;
  __pyx_pybuffer_b.pybuffer.buf = NULL;
  __pyx_pybuffer_b.refcount = 0;
  __pyx_pybuffernd_b.data = NULL;
  __pyx_pybuffernd_b.rcbuffer = &__pyx_pybuffer_b;
  __pyx_pybuffer_precon.pybuffer.buf = NULL;
  __pyx_pybuffer_precon.refcount = 0;
  __pyx_pybuffernd_precon.data = NULL;
  __pyx_pybuffernd_precon.rcbuffer = &__pyx_pybuffer_precon;
  {
    __Pyx_BufFmt_StackElem __pyx_stack[1];
    if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_x0.rcbuffer->pybuffer, (PyObject*)__pyx_v_x0, &__Pyx_TypeInfo_double, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack) == -1)) __PYX_ERR(0, 60, __pyx_L1_error)
  }
  __pyx_pybuffernd_x0.diminfo[0].strides = __pyx_pybuffernd_x0.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_x0.diminfo[0].shape = __pyx_pybuffernd_x0.rcbuffer->pybuffer.shape[0];
  {
    __Pyx_BufFmt_StackElem __pyx_stack[1];
    if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_b.rcbuffer->pybuffer, (PyObject*)__pyx_v_b, &__Pyx_TypeInfo_double, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack) == -1)) __PYX_ERR(0, 60, __pyx_L1_error)
  }
  __pyx_pybuffernd_b.diminfo[0].strides = __pyx_pybuffernd_b.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_b.diminfo[0].shape = __pyx_pybuffernd_b.rcbuffer->pybuffer.shape[0];
  {
    __Pyx_BufFmt_StackElem __pyx_stack[1];
    if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_precon.rcbuffer->pybuffer, (PyObject*)__pyx_v_precon, &__Pyx_TypeInfo_double, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack) == -1)) __PYX_ERR(0, 60, __pyx_L1_error)
  }
  __pyx_pybuffernd_precon.diminfo[0].strides = __pyx_pybuffernd_precon.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_precon.diminfo[0].shape = __pyx_pybuffernd_precon.rcbuffer->pybuffer.shape[0];
/* … */
  /* function exit code */
  __pyx_L1_error:;
  __Pyx_XDECREF(__pyx_t_1);
  { PyObject *__pyx_type, *__pyx_value, *__pyx_tb;
    __Pyx_PyThreadState_declare
    __Pyx_PyThreadState_assign
    __Pyx_ErrFetch(&__pyx_type, &__pyx_value, &__pyx_tb);
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_b.rcbuffer->pybuffer);
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_colind.rcbuffer->pybuffer);
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_data.rcbuffer->pybuffer);
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_precon.rcbuffer->pybuffer);
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_row_ptr.rcbuffer->pybuffer);
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_x0.rcbuffer->pybuffer);
  __Pyx_ErrRestore(__pyx_type, __pyx_value, __pyx_tb);}
  __Pyx_AddTraceback("anuga.utilities.cg_ext.cg_solve_c_precon", __pyx_clineno, __pyx_lineno, __pyx_filename);
  __pyx_r = NULL;
  goto __pyx_L2;
  __pyx_L0:;
  __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_b.rcbuffer->pybuffer);
  __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_colind.rcbuffer->pybuffer);
  __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_data.rcbuffer->pybuffer);
  __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_precon.rcbuffer->pybuffer);
  __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_row_ptr.rcbuffer->pybuffer);
  __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_x0.rcbuffer->pybuffer);
  __pyx_L2:;
  __Pyx_XDECREF((PyObject *)__pyx_v_data);
  __Pyx_XDECREF((PyObject *)__pyx_v_colind);
  __Pyx_XDECREF((PyObject *)__pyx_v_row_ptr);
  __Pyx_XGIVEREF(__pyx_r);
  __Pyx_RefNannyFinishContext();
  return __pyx_r;
}
/* … */
  __pyx_tuple__7 = PyTuple_Pack(13, __pyx_n_s_csr_sparse, __pyx_n_s_x0, __pyx_n_s_b, __pyx_n_s_imax, __pyx_n_s_tol, __pyx_n_s_a_tol, __pyx_n_s_bcols, __pyx_n_s_precon, __pyx_n_s_M, __pyx_n_s_err, __pyx_n_s_data, __pyx_n_s_colind, __pyx_n_s_row_ptr); if (unlikely(!__pyx_tuple__7)) __PYX_ERR(0, 60, __pyx_L1_error)
  __Pyx_GOTREF(__pyx_tuple__7);
  __Pyx_GIVEREF(__pyx_tuple__7);
/* … */
  __pyx_t_1 = PyCFunction_NewEx(&__pyx_mdef_5anuga_9utilities_6cg_ext_5cg_solve_c_precon, NULL, __pyx_n_s_anuga_utilities_cg_ext); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 60, __pyx_L1_error)
  __Pyx_GOTREF(__pyx_t_1);
  if (PyDict_SetItem(__pyx_d, __pyx_n_s_cg_solve_c_precon, __pyx_t_1) < 0) __PYX_ERR(0, 60, __pyx_L1_error)
  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
 61:                     np.ndarray[double, ndim=1, mode="c"] x0 not None,\
 62:                     np.ndarray[double, ndim=1, mode="c"] b not None,\
 63:                     int imax,\
 64:                     double tol,\
 65:                     double a_tol,\
 66:                     int bcols,\
 67:                     np.ndarray[double, ndim=1, mode="c"] precon not None):
 68: 
 69:     cdef int M, err
 70:     cdef np.ndarray[double, ndim=1, mode="c"] data
 71:     cdef np.ndarray[long, ndim=1, mode="c"] colind
 72:     cdef np.ndarray[long, ndim=1, mode="c"] row_ptr
 73: 
+74:     data = csr_sparse.data
  __pyx_t_1 = __Pyx_PyObject_GetAttrStr(__pyx_v_csr_sparse, __pyx_n_s_data); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 74, __pyx_L1_error)
  __Pyx_GOTREF(__pyx_t_1);
  if (!(likely(((__pyx_t_1) == Py_None) || likely(__Pyx_TypeTest(__pyx_t_1, __pyx_ptype_5numpy_ndarray))))) __PYX_ERR(0, 74, __pyx_L1_error)
  __pyx_t_2 = ((PyArrayObject *)__pyx_t_1);
  {
    __Pyx_BufFmt_StackElem __pyx_stack[1];
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_data.rcbuffer->pybuffer);
    __pyx_t_3 = __Pyx_GetBufferAndValidate(&__pyx_pybuffernd_data.rcbuffer->pybuffer, (PyObject*)__pyx_t_2, &__Pyx_TypeInfo_double, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack);
    if (unlikely(__pyx_t_3 < 0)) {
      PyErr_Fetch(&__pyx_t_4, &__pyx_t_5, &__pyx_t_6);
      if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_data.rcbuffer->pybuffer, (PyObject*)__pyx_v_data, &__Pyx_TypeInfo_double, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack) == -1)) {
        Py_XDECREF(__pyx_t_4); Py_XDECREF(__pyx_t_5); Py_XDECREF(__pyx_t_6);
        __Pyx_RaiseBufferFallbackError();
      } else {
        PyErr_Restore(__pyx_t_4, __pyx_t_5, __pyx_t_6);
      }
      __pyx_t_4 = __pyx_t_5 = __pyx_t_6 = 0;
    }
    __pyx_pybuffernd_data.diminfo[0].strides = __pyx_pybuffernd_data.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_data.diminfo[0].shape = __pyx_pybuffernd_data.rcbuffer->pybuffer.shape[0];
    if (unlikely(__pyx_t_3 < 0)) __PYX_ERR(0, 74, __pyx_L1_error)
  }
  __pyx_t_2 = 0;
  __pyx_v_data = ((PyArrayObject *)__pyx_t_1);
  __pyx_t_1 = 0;
+75:     colind = csr_sparse.colind
  __pyx_t_1 = __Pyx_PyObject_GetAttrStr(__pyx_v_csr_sparse, __pyx_n_s_colind); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 75, __pyx_L1_error)
  __Pyx_GOTREF(__pyx_t_1);
  if (!(likely(((__pyx_t_1) == Py_None) || likely(__Pyx_TypeTest(__pyx_t_1, __pyx_ptype_5numpy_ndarray))))) __PYX_ERR(0, 75, __pyx_L1_error)
  __pyx_t_7 = ((PyArrayObject *)__pyx_t_1);
  {
    __Pyx_BufFmt_StackElem __pyx_stack[1];
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_colind.rcbuffer->pybuffer);
    __pyx_t_3 = __Pyx_GetBufferAndValidate(&__pyx_pybuffernd_colind.rcbuffer->pybuffer, (PyObject*)__pyx_t_7, &__Pyx_TypeInfo_long, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack);
    if (unlikely(__pyx_t_3 < 0)) {
      PyErr_Fetch(&__pyx_t_6, &__pyx_t_5, &__pyx_t_4);
      if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_colind.rcbuffer->pybuffer, (PyObject*)__pyx_v_colind, &__Pyx_TypeInfo_long, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack) == -1)) {
        Py_XDECREF(__pyx_t_6); Py_XDECREF(__pyx_t_5); Py_XDECREF(__pyx_t_4);
        __Pyx_RaiseBufferFallbackError();
      } else {
        PyErr_Restore(__pyx_t_6, __pyx_t_5, __pyx_t_4);
      }
      __pyx_t_6 = __pyx_t_5 = __pyx_t_4 = 0;
    }
    __pyx_pybuffernd_colind.diminfo[0].strides = __pyx_pybuffernd_colind.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_colind.diminfo[0].shape = __pyx_pybuffernd_colind.rcbuffer->pybuffer.shape[0];
    if (unlikely(__pyx_t_3 < 0)) __PYX_ERR(0, 75, __pyx_L1_error)
  }
  __pyx_t_7 = 0;
  __pyx_v_colind = ((PyArrayObject *)__pyx_t_1);
  __pyx_t_1 = 0;
+76:     row_ptr = csr_sparse.row_ptr
  __pyx_t_1 = __Pyx_PyObject_GetAttrStr(__pyx_v_csr_sparse, __pyx_n_s_row_ptr); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 76, __pyx_L1_error)
  __Pyx_GOTREF(__pyx_t_1);
  if (!(likely(((__pyx_t_1) == Py_None) || likely(__Pyx_TypeTest(__pyx_t_1, __pyx_ptype_5numpy_ndarray))))) __PYX_ERR(0, 76, __pyx_L1_error)
  __pyx_t_8 = ((PyArrayObject *)__pyx_t_1);
  {
    __Pyx_BufFmt_StackElem __pyx_stack[1];
    __Pyx_SafeReleaseBuffer(&__pyx_pybuffernd_row_ptr.rcbuffer->pybuffer);
    __pyx_t_3 = __Pyx_GetBufferAndValidate(&__pyx_pybuffernd_row_ptr.rcbuffer->pybuffer, (PyObject*)__pyx_t_8, &__Pyx_TypeInfo_long, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack);
    if (unlikely(__pyx_t_3 < 0)) {
      PyErr_Fetch(&__pyx_t_4, &__pyx_t_5, &__pyx_t_6);
      if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_pybuffernd_row_ptr.rcbuffer->pybuffer, (PyObject*)__pyx_v_row_ptr, &__Pyx_TypeInfo_long, PyBUF_FORMAT| PyBUF_C_CONTIGUOUS, 1, 0, __pyx_stack) == -1)) {
        Py_XDECREF(__pyx_t_4); Py_XDECREF(__pyx_t_5); Py_XDECREF(__pyx_t_6);
        __Pyx_RaiseBufferFallbackError();
      } else {
        PyErr_Restore(__pyx_t_4, __pyx_t_5, __pyx_t_6);
      }
      __pyx_t_4 = __pyx_t_5 = __pyx_t_6 = 0;
    }
    __pyx_pybuffernd_row_ptr.diminfo[0].strides = __pyx_pybuffernd_row_ptr.rcbuffer->pybuffer.strides[0]; __pyx_pybuffernd_row_ptr.diminfo[0].shape = __pyx_pybuffernd_row_ptr.rcbuffer->pybuffer.shape[0];
    if (unlikely(__pyx_t_3 < 0)) __PYX_ERR(0, 76, __pyx_L1_error)
  }
  __pyx_t_8 = 0;
  __pyx_v_row_ptr = ((PyArrayObject *)__pyx_t_1);
  __pyx_t_1 = 0;
 77: 
+78:     M = row_ptr.shape[0] - 1
  __pyx_v_M = ((__pyx_v_row_ptr->dimensions[0]) - 1);
 79: 
+80:     err = _cg_solve_c_precon(&data[0],\
  __pyx_t_9 = 0;
/* … */
  __pyx_v_err = _cg_solve_c_precon((&(*__Pyx_BufPtrCContig1d(double *, __pyx_pybuffernd_data.rcbuffer->pybuffer.buf, __pyx_t_9, __pyx_pybuffernd_data.diminfo[0].strides))), (&(*__Pyx_BufPtrCContig1d(long *, __pyx_pybuffernd_colind.rcbuffer->pybuffer.buf, __pyx_t_10, __pyx_pybuffernd_colind.diminfo[0].strides))), (&(*__Pyx_BufPtrCContig1d(long *, __pyx_pybuffernd_row_ptr.rcbuffer->pybuffer.buf, __pyx_t_11, __pyx_pybuffernd_row_ptr.diminfo[0].strides))), (&(*__Pyx_BufPtrCContig1d(double *, __pyx_pybuffernd_b.rcbuffer->pybuffer.buf, __pyx_t_12, __pyx_pybuffernd_b.diminfo[0].strides))), (&(*__Pyx_BufPtrCContig1d(double *, __pyx_pybuffernd_x0.rcbuffer->pybuffer.buf, __pyx_t_13, __pyx_pybuffernd_x0.diminfo[0].strides))), __pyx_v_imax, __pyx_v_tol, __pyx_v_a_tol, __pyx_v_M, (&(*__Pyx_BufPtrCContig1d(double *, __pyx_pybuffernd_precon.rcbuffer->pybuffer.buf, __pyx_t_14, __pyx_pybuffernd_precon.diminfo[0].strides))));
+81:                             &colind[0],\
  __pyx_t_10 = 0;
+82:                             &row_ptr[0],\
  __pyx_t_11 = 0;
+83:                             &b[0],\
  __pyx_t_12 = 0;
+84:                             &x0[0],\
  __pyx_t_13 = 0;
 85:                             imax,\
 86:                             tol,\
 87:                             a_tol,\
 88:                             M,\
+89:                             &precon[0])
  __pyx_t_14 = 0;
 90: 
+91:     return err
  __Pyx_XDECREF(__pyx_r);
  __pyx_t_1 = __Pyx_PyInt_From_int(__pyx_v_err); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 91, __pyx_L1_error)
  __Pyx_GOTREF(__pyx_t_1);
  __pyx_r = __pyx_t_1;
  __pyx_t_1 = 0;
  goto __pyx_L0;