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LOAD_FAST_BORROW; POP_TOP pairs should be removed #152600
Description
Feature or enhancement
Proposal:
I noticed that
def f(x):
xproduces these instructions:
3 RESUME 0
4 LOAD_FAST_BORROW 0 (x)
POP_TOP
LOAD_COMMON_CONSTANT 7 (None)
RETURN_VALUE
Full reproducer
from dis import dis
def f(x):
x
dis(f)The compiler should get rid of any LOAD_FAST_BORROW; POP_TOP pairs.
I will work on this.
Has this already been discussed elsewhere?
This is a minor feature, which does not need previous discussion elsewhere
Links to previous discussion of this feature:
No response
Activity
picnixz commentedon Jun 29, 2026
cc @markshannon
markshannon commentedon Jun 29, 2026
Not a common pattern, but we might as well fix it.
LOAD_FASTandLOAD_CONSTANTas well.brijkapadia commentedon Jun 29, 2026
I think that constants are already removed.
Also I think this will help #145749.