Hi all,
I am having a simple performance problem that can be resolved by splitting up
an expression in two lines. I don't know if it is a bug or I am missing
something.
The piece of code below is translated to slow code
1)
cdef int i
i=int(x)+1
whereas the code below is translated to fast code
2)
cdef int i
i=int(x)
i=i+1
Snippet of generated code by cython
1)
/* "test.pyx":4
* cdef double x=3.2
* cdef int i
* i=int(x)+1 # <<<<<<<<<<<<<<
* return i
*
*/
__pyx_t_1 = PyFloat_FromDouble(__pyx_v_x); if (unlikely(!__pyx_t_1))
{__pyx_filename = __pyx_f[0]; __pyx_lineno = 4; __pyx_clineno = __LINE__; goto
__pyx_L1_error;}
__Pyx_GOTREF(__pyx_t_1);
__pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) {__pyx_filename =
__pyx_f[0]; __pyx_lineno = 4; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
__Pyx_GOTREF(((PyObject *)__pyx_t_2));
PyTuple_SET_ITEM(__pyx_t_2, 0, __pyx_t_1);
__Pyx_GIVEREF(__pyx_t_1);
__pyx_t_1 = 0;
__pyx_t_1 = PyObject_Call(((PyObject *)((PyObject*)(&PyInt_Type))),
((PyObject *)__pyx_t_2), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename =
__pyx_f[0]; __pyx_lineno = 4; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
__Pyx_GOTREF(__pyx_t_1);
__Pyx_DECREF(((PyObject *)__pyx_t_2)); __pyx_t_2 = 0;
__pyx_t_2 = PyNumber_Add(__pyx_t_1, __pyx_int_1); if (unlikely(!__pyx_t_2))
{__pyx_filename = __pyx_f[0]; __pyx_lineno = 4; __pyx_clineno = __LINE__; goto
__pyx_L1_error;}
__Pyx_GOTREF(__pyx_t_2);
__Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
__pyx_t_3 = __Pyx_PyInt_AsInt(__pyx_t_2); if (unlikely((__pyx_t_3 == (int)-1)
&& PyErr_Occurred())) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 4;
__pyx_clineno = __LINE__; goto __pyx_L1_error;}
__Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
__pyx_v_i = __pyx_t_3;
2)
/* "test.pyx":11
* cdef double x=3.2
* cdef int i
* i=int(x) # <<<<<<<<<<<<<<
* i=i+1
* return i
*/
__pyx_v_i = ((int)__pyx_v_x);
/* "test.pyx":12
* cdef int i
* i=int(x)
* i=i+1 # <<<<<<<<<<<<<<
* return i
*
*/
__pyx_v_i = (__pyx_v_i + 1);
I am using Cython-0.15.1
Best regards,
Ask
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