a02aeb236c
Former-commit-id:06a8b51d6d[formerly 64fa9254b946eae7e61bbc3f513b7c3696c4f54f] Former-commit-id:9f19e3f712
104 lines
2.4 KiB
ReStructuredText
Executable file
104 lines
2.4 KiB
ReStructuredText
Executable file
System configuration
|
|
====================
|
|
|
|
.. sectionauthor:: Travis E. Oliphant
|
|
|
|
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.
|
|
|
|
|
|
Data type sizes
|
|
---------------
|
|
|
|
The :cdata:`NPY_SIZEOF_{CTYPE}` constants are defined so that sizeof
|
|
information is available to the pre-processor.
|
|
|
|
.. cvar:: NPY_SIZEOF_SHORT
|
|
|
|
sizeof(short)
|
|
|
|
.. cvar:: NPY_SIZEOF_INT
|
|
|
|
sizeof(int)
|
|
|
|
.. cvar:: NPY_SIZEOF_LONG
|
|
|
|
sizeof(long)
|
|
|
|
.. cvar:: NPY_SIZEOF_LONG_LONG
|
|
|
|
sizeof(longlong) where longlong is defined appropriately on the
|
|
platform (A macro defines **NPY_SIZEOF_LONGLONG** as well.)
|
|
|
|
.. cvar:: NPY_SIZEOF_PY_LONG_LONG
|
|
|
|
|
|
.. cvar:: NPY_SIZEOF_FLOAT
|
|
|
|
sizeof(float)
|
|
|
|
.. cvar:: NPY_SIZEOF_DOUBLE
|
|
|
|
sizeof(double)
|
|
|
|
.. cvar:: NPY_SIZEOF_LONG_DOUBLE
|
|
|
|
sizeof(longdouble) (A macro defines **NPY_SIZEOF_LONGDOUBLE** as well.)
|
|
|
|
.. cvar:: NPY_SIZEOF_PY_INTPTR_T
|
|
|
|
Size of a pointer on this platform (sizeof(void \*)) (A macro defines
|
|
NPY_SIZEOF_INTP as well.)
|
|
|
|
|
|
Platform information
|
|
--------------------
|
|
|
|
.. cvar:: NPY_CPU_X86
|
|
.. cvar:: NPY_CPU_AMD64
|
|
.. cvar:: NPY_CPU_IA64
|
|
.. cvar:: NPY_CPU_PPC
|
|
.. cvar:: NPY_CPU_PPC64
|
|
.. cvar:: NPY_CPU_SPARC
|
|
.. cvar:: NPY_CPU_SPARC64
|
|
.. cvar:: NPY_CPU_S390
|
|
.. cvar:: NPY_CPU_PARISC
|
|
|
|
.. versionadded:: 1.3.0
|
|
|
|
CPU architecture of the platform; only one of the above is
|
|
defined.
|
|
|
|
Defined in ``numpy/npy_cpu.h``
|
|
|
|
.. cvar:: NPY_LITTLE_ENDIAN
|
|
|
|
.. cvar:: NPY_BIG_ENDIAN
|
|
|
|
.. cvar:: NPY_BYTE_ORDER
|
|
|
|
.. versionadded:: 1.3.0
|
|
|
|
Portable alternatives to the ``endian.h`` macros of GNU Libc.
|
|
If big endian, :cdata:`NPY_BYTE_ORDER` == :cdata:`NPY_BIG_ENDIAN`, and
|
|
similarly for little endian architectures.
|
|
|
|
Defined in ``numpy/npy_endian.h``.
|
|
|
|
.. cfunction:: PyArray_GetEndianness()
|
|
|
|
.. versionadded:: 1.3.0
|
|
|
|
Returns the endianness of the current platform.
|
|
One of :cdata:`NPY_CPU_BIG`, :cdata:`NPY_CPU_LITTLE`,
|
|
or :cdata:`NPY_CPU_UNKNOWN_ENDIAN`.
|
|
|