8000 gh-106581: Fix two bugs in the code generator's copy optimization by gvanrossum · Pull Request #108380 · python/cpython · GitHub
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gh-106581: Fix two bugs in the code generator's copy optimization #108380

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Merged
merged 5 commits into from
Aug 24, 2023
Merged

gh-106581: Fix two bugs in the code generator's copy optimization #108380

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87eed12
Fix bug in copy detection
gvanrossum Aug 22, 2023
de494fc
Fix problem with copying from 'unused'
gvanrossum Aug 23, 2023
848822f
Do more clever things with copies
gvanrossum Aug 24, 2023
1ca845a
Fix mypy
gvanrossum Aug 24, 2023
652f9a1
Reduce complexity
gvanrossum Aug 24, 2023
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Fix mypy
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@gvanrossum
gvanrossum committed Aug 24, 2023
commit 1ca845aae0057b138b8928d75d1afed8a4aa0ea3
5 changes: 3 additions & 2 deletions Tools/cases_generator/stacking.py
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Original file line number Diff line number Diff line change
Expand Up @@ -228,14 +228,15 @@ def __init__(
# Fix up patterns of copies through UNUSED,
# e.g. cp(a, UNUSED) + cp(UNUSED, b) -> cp(a, b).
if any(copy.src.effect.name == UNUSED for copy in self.copies):
pred = self
while pred := pred.pred:
pred = self.pred
while pred is not None:
for copy in self.copies:
if copy.src.effect.name == UNUSED:
for pred_copy in pred.copies:
if pred_copy.dst == copy.src:
copy.src = pred_copy.src
break
pred = pred.pred

def adjust_deeper(self, eff: StackEffect) -> None:
for peek in self.peeks:
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