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bpo-45569: Change PYLONG_BITS_IN_DIGIT default to 30 (GH-30497)

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Mark Dickinson 2022-01-14 18:54:56 +00:00 • committed by GitHub
parent ee1a8b336d
commit 025cbe7a9b
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6 changed files with 22 additions and 16 deletions
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16
Include/pyport.h
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@ -85,20 +85,12 @@ Used in: Py_SAFE_DOWNCAST
#define PY_INT32_T int32_t
#define PY_INT64_T int64_t
/* 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.
From pyodide: WASM has 32 bit pointers but has native 64 bit arithmetic
so it is more efficient to use 30 bit digits.
/* PYLONG_BITS_IN_DIGIT describes the number of bits per "digit" (limb) in the
* PyLongObject implementation (longintrepr.h). It's currently either 30 or 15,
* defaulting to 30. The 15-bit digit option may be removed in the future.
*/
#ifndef PYLONG_BITS_IN_DIGIT
#if SIZEOF_VOID_P >= 8 || defined(__wasm__)
# define PYLONG_BITS_IN_DIGIT 30
#else
# define PYLONG_BITS_IN_DIGIT 15
#endif
#define PYLONG_BITS_IN_DIGIT 30
#endif
/* uintptr_t is the C9X name for an unsigned integral type such that a