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gh-94155: Reduce hash collisions for code objects by sweeneyde · Pull Request #100183 · python/cpython · GitHub
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gh-94155: Reduce hash collisions for code objects #100183

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Merged
sweeneyde merged 7 commits into from
Dec 23, 2022
Merged

gh-94155: Reduce hash collisions for code objects #100183

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9942ce6
Reduce hash collisions for code objects
sweeneyde Dec 12, 2022
d54249c
📜🤖 Added by blurb_it.
blurb-it[bot] Dec 12, 2022
3c38f5a
don't compare unsigned to signed
sweeneyde Dec 12, 2022
dbb5c77
Disregard byte order
sweeneyde Dec 12, 2022
b2975bc
Merge remote-tracking branch 'upstream/main' into code_hash
sweeneyde Dec 17, 2022
2014fb1
SCRAMBLE_IN_HASH macro
sweeneyde Dec 19, 2022
cffe844
Merge branch 'main' into code_hash
sweeneyde Dec 23, 2022
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don't compare unsigned to signed
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@sweeneyde
sweeneyde committed Dec 12, 2022
commit 3c38f5a0efb2b4dce2f406229cd4a1b7ba2b7c65
12 changes: 6 additions & 6 deletions Objects/codeobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1834,10 +1834,10 @@ code_richcompare(PyObject *self, PyObject *other, int op)
static Py_hash_t
code_hash(PyCodeObject *co)
{
Py_uhash_t res = 20221211;
#define SCRAMBLE_IN(H) do { \
res ^= (Py_uhash_t)(H); \
res *= _PyHASH_MULTIPLIER; \
Py_uhash_t uhash = 20221211;
#define SCRAMBLE_IN(H) do { \
uhash ^= (Py_uhash_t)(H); \
uhash *= _PyHASH_MULTIPLIER; \
} while (0)
#define SCRAMBLE_IN_OR_ERR(EXPR) do { \
Py_hash_t h = (EXPR); \
Expand Down Expand Up @@ -1865,10 +1865,10 @@ code_hash(PyCodeObject *co)
SCRAMBLE_IN(co_instr);
i += _PyOpcode_Caches[_Py_OPCODE(co_instr)];
}
if (res == -1) {
if ((Py_hash_t)uhash == -1) {
return -2;
}
return res;
return (Py_hash_t)uhash;
}


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