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Simplify the read_i08() bool result cast. #162
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The cython-generated code for `bool(read_i08(buf))` includes a call to the
Python `bool` type function. That extra call is unnecessary in this case.
Instead, we can cast to cython's `bint` type, which generates code that
directly returns `Py_True` or `Py_False` (via `__Pyx_PyBool_FromLong`).
This appears to be the most efficient code generation for this expression.
For completeness, I also investigated these variants:
- <bool>read_i08(buf)
- read_i08(buf) != 0
- <bool>(read_i08(buf) != 0)
- return False if read_i08(buf) == 0 else True
lxyu
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Oct 12, 2015
Simplify the read_i08() bool result cast.
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The cython-generated code for
bool(read_i08(buf))includes a call to thePython
booltype function. That extra call is unnecessary in this case.Instead, we can cast to cython's
binttype, which generates code thatdirectly returns
Py_TrueorPy_False(via__Pyx_PyBool_FromLong).This appears to be the most efficient code generation for this expression.
For completeness, I also investigated these variants:
<bool>read_i08(buf)read_i08(buf) != 0<bool>(read_i08(buf) != 0)return False if read_i08(buf) == 0 else True