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Issue #4258: Make it possible to use 30-bit digits for PyLongs:

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- new configure option --enable-big-digits
 - new structseq sys.int_info giving information about the internal format
By default, 30-bit digits are enabled on 64-bit machines but
disabled on 32-bit machines.
This commit is contained in:
Mark Dickinson 2009-03-18 20:06:12 +00:00
parent e7f45b8e59
commit bd7926478d
15 changed files with 865 additions and 68 deletions
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51
Include/pyport.h
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@ -69,6 +69,57 @@ Used in: PY_LONG_LONG
#endif
#endif /* HAVE_LONG_LONG */
/* a build with 30-bit digits for Python long integers needs an exact-width
* 32-bit unsigned integer type to store those digits. (We could just use
* type 'unsigned long', but that would be wasteful on a system where longs
* are 64-bits.) On Unix systems, the autoconf macro AC_TYPE_UINT32_T defines
* uint32_t to be such a type unless stdint.h or inttypes.h defines uint32_t.
* However, it doesn't set HAVE_UINT32_T, so we do that here.
*/
#if (defined UINT32_MAX || defined uint32_t)
#ifndef PY_UINT32_T
#define HAVE_UINT32_T 1
#define PY_UINT32_T uint32_t
#endif
#endif
/* Macros for a 64-bit unsigned integer type; used for type 'twodigits' in the
* long integer implementation, when 30-bit digits are enabled.
*/
#if (defined UINT64_MAX || defined uint64_t)
#ifndef PY_UINT64_T
#define HAVE_UINT64_T 1
#define PY_UINT64_T uint64_t
#endif
#endif
/* Signed variants of the above */
#if (defined INT32_MAX || defined int32_t)
#ifndef PY_INT32_T
#define HAVE_INT32_T 1
#define PY_INT32_T int32_t
#endif
#endif
#if (defined INT64_MAX || defined int64_t)
#ifndef PY_INT64_T
#define HAVE_INT64_T 1
#define PY_INT64_T int64_t
#endif
#endif
/* If PYLONG_BITS_IN_DIGIT is not defined then we'll use 30-bit digits if all
the necessary integer types are available, and we're on a 64-bit platform
(as determined by SIZEOF_VOID_P); otherwise we use 15-bit digits. */
#ifndef PYLONG_BITS_IN_DIGIT
#if (defined HAVE_UINT64_T && defined HAVE_INT64_T && \
defined HAVE_UINT32_T && defined HAVE_INT32_T && SIZEOF_VOID_P >= 8)
#define PYLONG_BITS_IN_DIGIT 30
#else
#define PYLONG_BITS_IN_DIGIT 15
#endif
#endif
/* uintptr_t is the C9X name for an unsigned integral type such that a
* legitimate void* can be cast to uintptr_t and then back to void* again
* without loss of information. Similarly for intptr_t, wrt a signed