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gh-127119: Faster check for small ints in long_dealloc (GH-127620)

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Pieter Eendebak 2025-01-29 16:22:18 +01:00 • committed by GitHub
parent 3a974e39d5
commit a29221675e
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6 changed files with 48 additions and 45 deletions
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7
Include/internal/pycore_long.h
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@ -159,13 +159,14 @@ PyAPI_FUNC(int) _PyLong_Size_t_Converter(PyObject *, void *);
/* Long value tag bits:
* 0-1: Sign bits value = (1-sign), ie. negative=2, positive=0, zero=1.
* 2: Reserved for immortality bit
* 2: Set to 1 for the small ints
* 3+ Unsigned digit count
*/
#define SIGN_MASK 3
#define SIGN_ZERO 1
#define SIGN_NEGATIVE 2
#define NON_SIZE_BITS 3
#define IMMORTALITY_BIT_MASK (1 << 2)
/* The functions _PyLong_IsCompact and _PyLong_CompactValue are defined
* in Include/cpython/longobject.h, since they need to be inline.
@ -196,7 +197,7 @@ PyAPI_FUNC(int) _PyLong_Size_t_Converter(PyObject *, void *);
static inline int
_PyLong_IsNonNegativeCompact(const PyLongObject* op) {
assert(PyLong_Check(op));
return op->long_value.lv_tag <= (1 << NON_SIZE_BITS);
return ((op->long_value.lv_tag & ~IMMORTALITY_BIT_MASK) <= (1 << NON_SIZE_BITS));
}
@ -298,7 +299,7 @@ _PyLong_FlipSign(PyLongObject *op) {
.long_value = { \
.lv_tag = TAG_FROM_SIGN_AND_SIZE( \
(val) == 0 ? 0 : ((val) < 0 ? -1 : 1), \
(val) == 0 ? 0 : 1), \
(val) == 0 ? 0 : 1) | IMMORTALITY_BIT_MASK, \
{ ((val) >= 0 ? (val) : -(val)) }, \
} \
}