When NumPy is built, information about system configuration is recorded, and is made available for extension modules using NumPy’s C API. These are mostly defined in numpyconfig.h (included in ndarrayobject.h). The public symbols are prefixed by NPY_*. NumPy also offers some functions for querying information about the platform in use.
For private use, NumPy also constructs a config.h in the NumPy include directory, which is not exported by NumPy (that is a python extension which use the numpy C API will not see those symbols), to avoid namespace pollution.
The NPY_SIZEOF_{CTYPE} constants are defined so that sizeof information is available to the pre-processor.
NPY_SIZEOF_SHORT sizeof(short)
NPY_SIZEOF_INT sizeof(int)
NPY_SIZEOF_LONG sizeof(long)
NPY_SIZEOF_LONGLONG sizeof(longlong) where longlong is defined appropriately on the platform.
NPY_SIZEOF_PY_LONG_LONG NPY_SIZEOF_FLOAT sizeof(float)
NPY_SIZEOF_DOUBLE sizeof(double)
NPY_SIZEOF_LONG_DOUBLE sizeof(longdouble) (A macro defines NPY_SIZEOF_LONGDOUBLE as well.)
NPY_SIZEOF_PY_INTPTR_T Size of a pointer on this platform (sizeof(void *)) (A macro defines NPY_SIZEOF_INTP as well.)
NPY_CPU_X86 NPY_CPU_AMD64 NPY_CPU_IA64 NPY_CPU_PPC NPY_CPU_PPC64 NPY_CPU_SPARC NPY_CPU_SPARC64 NPY_CPU_S390 NPY_CPU_PARISC New in version 1.3.0.
CPU architecture of the platform; only one of the above is defined.
Defined in numpy/npy_cpu.h
NPY_LITTLE_ENDIAN NPY_BIG_ENDIAN NPY_BYTE_ORDER New in version 1.3.0.
Portable alternatives to the endian.h macros of GNU Libc. If big endian, NPY_BYTE_ORDER == NPY_BIG_ENDIAN, and similarly for little endian architectures.
Defined in numpy/npy_endian.h.
PyArray_GetEndianness() New in version 1.3.0.
Returns the endianness of the current platform. One of NPY_CPU_BIG, NPY_CPU_LITTLE, or NPY_CPU_UNKNOWN_ENDIAN.
NPY_LIKELY NPY_UNLIKELY NPY_UNUSED NPY_INTERRUPT_H NPY_SIGSETJMP NPY_SIGLONGJMP NPY_SIGJMP_BUF NPY_SIGINT_ON NPY_SIGINT_OFF
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Licensed under the 3-clause BSD License.
https://docs.scipy.org/doc/numpy-1.17.0/reference/c-api.config.html