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Compile calls to NewType types into no-ops #958
Description
Calling a NewType type is currently slow. Consider this code:
from typing import NewType, cast
class C: pass
N = NewType("N", C)
def f(c: C) -> N:
return N(c) # Slow!The IR for the call N(c) looks like this:
L0:
r0 = tt.globals :: static
r1 = 'N'
r2 = CPyDict_GetItem(r0, r1)
if is_error(r2) goto L3 (error at f:10) else goto L1
L1:
r3 = [c]
r4 = load_address r3
r5 = _PyObject_Vectorcall(r2, r4, 1, 0)
dec_ref r2
if is_error(r5) goto L3 (error at f:10) else goto L2
Since calling a NewType type is a no-op at runtime, we can simply compile the call away.
Activity
[mypyc] Compile away NewType type calls (#14398)