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gh-134584: Eliminate redundant refcounting from _BINARY_OP_ADD_UNICODE #135817

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gh-134584: Eliminate redundant refcounting from _BINARY_OP_ADD_UNICODE #135817

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d5afe15
gh-134584: Elimiate redundant refcounting from _BINARY_OP_X_UNICODE
corona10 Jun 22, 2025
46b423f
WIP
corona10 Jun 22, 2025
c901079
Address code review
corona10 Jun 22, 2025
ea112a5
Address code review
corona10 Jun 22, 2025
d95aee9
Merge remote-tracking branch 'upstream/main' into gh-134584-unicode
corona10 Jun 23, 2025
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Address code review
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@corona10
corona10 committed Jun 22, 2025
commit ea112a555b885f6ab84bd73232adb210b9c65419
17 changes: 9 additions & 8 deletions Lib/test/test_capi/test_opt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2367,19 +2367,20 @@ def testfunc(n):
def test_store_fast_pop_top_specialize_unicode(self):
def random_str(n):
return ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(n))
def testfunc(n):
y = random_str(32)
def testfunc(args):
a, b, n = args
c = ''
for _ in range(n):
x = y + y # _POP_TOP
x = None # _POP_TOP_NOP

testfunc(TIER2_THRESHOLD)
c += a + b
return c

ex = get_first_executor(testfunc)
r0, r1 = random_str(32), random_str(32)
res, ex = self._run_with_optimizer(testfunc, (r0, r1, TIER2_THRESHOLD))
self.assertAlmostEqual(res, TIER2_THRESHOLD * (r0 + r1))
self.assertIsNotNone(ex)
uops = get_opnames(ex)

self.assertIn("_POP_TOP_NOP", uops)
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@tomasr8 tomasr8 Jun 22, 2025

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Maybe also add

self.assertIn("_BINARY_OP_ADD_UNICODE", uops)

to make sure this is the op that's actually generated?

Should we also test for _POP_TOP_UNICODE?

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@corona10 corona10 Jun 22, 2025

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In this code, It will be replaced to _POP_TOP_NOP because _POP_TOP_UNICODE will be optimized to _POP_TOP_NOP .

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@tomasr8 tomasr8 Jun 23, 2025

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Yup, do you think it makes sense to test _POP_TOP_UNICODE separately? That is, the case when it is not optimized to _POP_TOP_NOP? (not sure how difficult it'll be to come up with a test case though)

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@Fidget-Spinner Fidget-Spinner Jun 23, 2025

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I have a test for that in my original PR already.

self.assertNotIn("_POP_TOP_UNICODE", uops)

def test_attr_promotion_failure(self):
# We're not testing for any specific uops here, just
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