On 2016-06-02 21:12, Robert Bradshaw wrote:
"if isinstance(x, (int,long))", which is parsed as "if PyInt_Check(x) or
PyLong_Check(x)" is slightly slower than "if PyInt_Check(x) ||
PyLong_Check(x)".
That is very surprising. How much slower?
With GCC 4.9.3, roughly 4% for a simple loop like
for x in L:
if isinstance(x, (int, long)):
return True
I wonder if
this is due to gcc's expectations about the likelyhood of truth values
of the subexpressions in a logical or vs. an if...
I doubt it. It's just the optimizer which optimizes arithmetic better
than if/goto.
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