8000 gh-129149: Add fast path for medium-size integers in `PyLong_FromSsize_t()` by chris-eibl · Pull Request #129301 · python/cpython · GitHub
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gh-129149: Add fast path for medium-size integers in PyLong_FromSsize_t() #129301

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Merged
merged 13 commits into from
Mar 13, 2025
Merged

gh-129149: Add fast path for medium-size integers in PyLong_FromSsize_t() #129301

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37bddee
gh-129149: add macro PYLONG_FROM_INT
chris-eibl Jan 25, 2025
b4ee2af
Add UINT_TYPE to the macro PYLONG_FROM_INT.
chris-eibl Jan 25, 2025
cf9244c
blurb it
chris-eibl Jan 25, 2025
ed04f4a
Address Sergey's review
chris-eibl Jan 26, 2025
c59bef0
Address Sergey's review
chris-eibl Jan 26, 2025
98b3668
Address Sergey's review
chris-eibl Jan 26, 2025
ff57cf7
More stylistic syncs with PYLONG_FROM_UINT
chris-eibl Jan 26, 2025
3a5152f
Merge branch 'main' into gh-129149
skirpichev Jan 26, 2025
8331f8b
Merge branch 'main' into gh-129149
chris-eibl Jan 29, 2025
f0691c5
address PEP-7 by vertically aligning \
chris-eibl Mar 1, 2025
261dcc5
test more medium-size integers in all test_long_as*
chris-eibl Mar 1, 2025
fda2844
Merge branch 'main' into gh-129149
chris-eibl Mar 1, 2025
89ee42b
Merge branch 'main' into gh-129149
chris-eibl Mar 12, 2025
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address PEP-7 by vertically aligning \ 
(on a multiple of 4 spaces)
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@chris-eibl
chris-eibl committed Mar 1, 2025
commit f0691c5c9358fe9926d86d814507fc0ed221d9e3
60 changes: 30 additions & 30 deletions Objects/longobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -332,37 +332,37 @@ _PyLong_Negate(PyLongObject **x_p)
Py_DECREF(x);
}

#define PYLONG_FROM_INT(UINT_TYPE, INT_TYPE, ival) \
do { \
/* Handle small and medium cases. */ \
if (IS_SMALL_INT(ival)) { \
return get_small_int((sdigit)(ival)); \
} \
if (-(INT_TYPE)PyLong_MASK <= (ival) && (ival) <= (INT_TYPE)PyLong_MASK) { \
return _PyLong_FromMedium((sdigit)(ival)); \
} \
#define PYLONG_FROM_INT(UINT_TYPE, INT_TYPE, ival) \
do { \
/* Handle small and medium cases. */ \
if (IS_SMALL_INT(ival)) { \
return get_small_int((sdigit)(ival)); \
} \
if (-(INT_TYPE)PyLong_MASK <= (ival) && (ival) <= (INT_TYPE)PyLong_MASK) { \
return _PyLong_FromMedium((sdigit)(ival)); \
} \
UINT_TYPE abs_ival = (ival) < 0 ? 0U-(UINT_TYPE)(ival) : (UINT_TYPE)(ival); \
/* Do shift in two steps to avoid possible undefined behavior. */ \
UINT_TYPE t = abs_ival >> PyLong_SHIFT >> PyLong_SHIFT; \
/* Count digits (at least two - smaller cases were handled above). */ \
Py_ssize_t ndigits = 2; \
while (t) { \
++ndigits; \
t >>= PyLong_SHIFT; \
} \
/* Construct output value. */ \
PyLongObject *v = long_alloc(ndigits); \
if (v == NULL) { \
return NULL; \
} \
digit *p = v->long_value.ob_digit; \
_PyLong_SetSignAndDigitCount(v, (ival) < 0 ? -1 : 1, ndigits); \
t = abs_ival; \
while (t) { \
*p++ = (digit)(t & PyLong_MASK); \
t >>= PyLong_SHIFT; \
} \
return (PyObject *)v; \
/* Do shift in two steps to avoid possible undefined behavior. */ \
UINT_TYPE t = abs_ival >> PyLong_SHIFT >> PyLong_SHIFT; \
/* Count digits (at least two - smaller cases were handled above). */ \
Py_ssize_t ndigits = 2; \
while (t) { \
++ndigits; \
t >>= PyLong_SHIFT; \
} \
/* Construct output value. */ \
PyLongObject *v = long_alloc(ndigits); \
if (v == NULL) { \
return NULL; \
} \
digit *p = v->long_value.ob_digit; \
_PyLong_SetSignAndDigitCount(v, (ival) < 0 ? -1 : 1, ndigits); \
t = abs_ival; \
while (t) { \
*p++ = (digit)(t & PyLong_MASK); \
t >>= PyLong_SHIFT; \
} \
return (PyObject *)v; \
} while(0)


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