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svn+ssh://pythondev@svn.python.org/python/trunk ........ r62380 | christian.heimes | 2008-04-19 01:13:07 +0200 (Sat, 19 Apr 2008) | 3 lines I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. The patch also adds acosh, asinh, atanh, log1p and copysign to all platforms. Finally it fixes differences between platforms like different results or exceptions for edge cases. Have fun :) ........ r62382 | christian.heimes | 2008-04-19 01:40:40 +0200 (Sat, 19 Apr 2008) | 2 lines Added new files to Windows project files More Windows related fixes are coming soon ........ r62383 | christian.heimes | 2008-04-19 01:49:11 +0200 (Sat, 19 Apr 2008) | 1 line Stupid me. Py_RETURN_NAN should actually return something ... ........
112 lines
4.1 KiB
C
112 lines
4.1 KiB
C
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/* Float object interface */
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/*
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PyFloatObject represents a (double precision) floating point number.
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*/
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#ifndef Py_FLOATOBJECT_H
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#define Py_FLOATOBJECT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct {
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PyObject_HEAD
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double ob_fval;
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} PyFloatObject;
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PyAPI_DATA(PyTypeObject) PyFloat_Type;
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#define PyFloat_Check(op) PyObject_TypeCheck(op, &PyFloat_Type)
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#define PyFloat_CheckExact(op) (Py_TYPE(op) == &PyFloat_Type)
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#ifdef Py_NAN
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#define Py_RETURN_NAN return PyFloat_FromDouble(Py_NAN)
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#endif
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#define Py_RETURN_INF(sign) do \
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if (copysign(1., sign) == 1.) { \
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return PyFloat_FromDouble(Py_HUGE_VAL); \
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} else { \
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return PyFloat_FromDouble(-Py_HUGE_VAL); \
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} while(0)
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PyAPI_FUNC(double) PyFloat_GetMax(void);
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PyAPI_FUNC(double) PyFloat_GetMin(void);
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PyAPI_FUNC(PyObject *) PyFloat_GetInfo(void);
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/* Return Python float from string PyObject. */
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PyAPI_FUNC(PyObject *) PyFloat_FromString(PyObject*);
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/* Return Python float from C double. */
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PyAPI_FUNC(PyObject *) PyFloat_FromDouble(double);
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/* Extract C double from Python float. The macro version trades safety for
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speed. */
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PyAPI_FUNC(double) PyFloat_AsDouble(PyObject *);
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#define PyFloat_AS_DOUBLE(op) (((PyFloatObject *)(op))->ob_fval)
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/* _PyFloat_{Pack,Unpack}{4,8}
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*
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* The struct and pickle (at least) modules need an efficient platform-
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* independent way to store floating-point values as byte strings.
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* The Pack routines produce a string from a C double, and the Unpack
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* routines produce a C double from such a string. The suffix (4 or 8)
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* specifies the number of bytes in the string.
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*
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* On platforms that appear to use (see _PyFloat_Init()) IEEE-754 formats
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* these functions work by copying bits. On other platforms, the formats the
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* 4- byte format is identical to the IEEE-754 single precision format, and
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* the 8-byte format to the IEEE-754 double precision format, although the
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* packing of INFs and NaNs (if such things exist on the platform) isn't
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* handled correctly, and attempting to unpack a string containing an IEEE
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* INF or NaN will raise an exception.
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*
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* On non-IEEE platforms with more precision, or larger dynamic range, than
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* 754 supports, not all values can be packed; on non-IEEE platforms with less
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* precision, or smaller dynamic range, not all values can be unpacked. What
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* happens in such cases is partly accidental (alas).
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*/
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/* The pack routines write 4 or 8 bytes, starting at p. le is a bool
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* argument, true if you want the string in little-endian format (exponent
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* last, at p+3 or p+7), false if you want big-endian format (exponent
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* first, at p).
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* Return value: 0 if all is OK, -1 if error (and an exception is
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* set, most likely OverflowError).
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* There are two problems on non-IEEE platforms:
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* 1): What this does is undefined if x is a NaN or infinity.
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* 2): -0.0 and +0.0 produce the same string.
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*/
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PyAPI_FUNC(int) _PyFloat_Pack4(double x, unsigned char *p, int le);
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PyAPI_FUNC(int) _PyFloat_Pack8(double x, unsigned char *p, int le);
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/* Needed for the old way for marshal to store a floating point number.
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Returns the string length copied into p, -1 on error.
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*/
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PyAPI_FUNC(int) _PyFloat_Repr(double x, char *p, size_t len);
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/* Used to get the important decimal digits of a double */
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PyAPI_FUNC(int) _PyFloat_Digits(char *buf, double v, int *signum);
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PyAPI_FUNC(void) _PyFloat_DigitsInit(void);
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/* The unpack routines read 4 or 8 bytes, starting at p. le is a bool
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* argument, true if the string is in little-endian format (exponent
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* last, at p+3 or p+7), false if big-endian (exponent first, at p).
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* Return value: The unpacked double. On error, this is -1.0 and
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* PyErr_Occurred() is true (and an exception is set, most likely
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* OverflowError). Note that on a non-IEEE platform this will refuse
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* to unpack a string that represents a NaN or infinity.
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*/
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PyAPI_FUNC(double) _PyFloat_Unpack4(const unsigned char *p, int le);
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PyAPI_FUNC(double) _PyFloat_Unpack8(const unsigned char *p, int le);
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/* free list api */
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PyAPI_FUNC(void) PyFloat_CompactFreeList(size_t *, size_t *, size_t *);
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_FLOATOBJECT_H */
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