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gh-131525: Cache the result of tuple_hash #131529

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Merged
mdboom merged 18 commits into from
Mar 27, 2025
Merged

gh-131525: Cache the result of tuple_hash #131529

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b3c3977
gh-131525: Cache the result of tuple_hash
mdboom Mar 20, 2025
8a1f93e
Fix debug builds
mdboom Mar 20, 2025
1442437
Add blurb
mdboom Mar 20, 2025
9d1c089
Fix formatting
mdboom Mar 20, 2025
40ad9fc
Pre-compute empty tuple singleton
mdboom Mar 21, 2025
9a392ed
Mostly set the cache within tuple_alloc
mdboom Mar 21, 2025
c4fb543
Fixes for TSAN
mdboom Mar 21, 2025
814db9a
Merge remote-tracking branch 'upstream/main' into tuple_hash_cache2
mdboom Mar 21, 2025
c24b33d
Pre-compute empty tuple singleton
mdboom Mar 21, 2025
edcc03d
Merge remote-tracking branch 'origin/tuple_hash_cache2' into tuple_ha…
mdboom Mar 21, 2025
224bef2
Fix for 32-bit platforms
mdboom Mar 21, 2025
23f9f66
Assert that op != NULL in _PyTuple_RESET_HASH_CACHE
mdboom Mar 24, 2025
9ee12f9
Use FT_ATOMIC_STORE_SSIZE_RELAXED macro
mdboom Mar 24, 2025
d2c521a
Merge remote-tracking branch 'upstream/main' into tuple_hash_cache2
mdboom Mar 24, 2025
2c8f077
Update Include/internal/pycore_tuple.h
mdboom Mar 24, 2025
a6edcea
Fix alignment
mdboom Mar 24, 2025
5faa68d
atomic load
mdboom Mar 25, 2025
da6fa30
Update Objects/tupleobject.c
mdboom Mar 26, 2025
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atomic load
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@mdboom
mdboom committed Mar 25, 2025
commit 5faa68d6c8a33feb2e656fe787e769952c65e1e7
7 changes: 4 additions & 3 deletions Objects/tupleobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -309,13 +309,14 @@ tuple_hash(PyObject *op)
{
PyTupleObject *v = _PyTuple_CAST(op);

if (v->ob_hash != -1) {
return v->ob_hash;
Py_uhash_t acc = FT_ATOMIC_LOAD_SSIZE_RELAXED(v->ob_hash);
if (acc != (Py_uhash_t)-1) {
return acc;
}

Py_ssize_t len = Py_SIZE(v);
PyObject **item = v->ob_item;
Py_uhash_t acc = _PyTuple_HASH_XXPRIME_5;
acc = _PyTuple_HASH_XXPRIME_5;
for (Py_ssize_t i = 0; i < len; i++) {
Py_uhash_t lane = PyObject_Hash(item[i]);
if (lane == (Py_uhash_t)-1) {
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