[issue9980] str(float) failure
Stefan Krah
report at bugs.python.org
Thu Sep 30 13:07:12 CEST 2010
Stefan Krah <stefan-usenet at bytereef.org> added the comment:
I benchmarked _PyOS_ascii_strtod without the macros, with the macros
and with always calling both fnstcw/fldcw. There is no real difference:
import timeit
s = "str(38210.0)"
t = timeit.Timer(stmt=s)
t.timeit(number=10000000)
t.timeit(number=10000000)
t.timeit(number=10000000)
# None
>>> t.timeit(number=10000000)
3.7519991397857666
>>> t.timeit(number=10000000)
3.759944200515747
>>> t.timeit(number=10000000)
3.7730538845062256
>>>
# Macros
>>> t.timeit(number=10000000)
3.780745029449463
>>> t.timeit(number=10000000)
3.777444839477539
>>> t.timeit(number=10000000)
3.7622230052948
# fnstcw/fldcw
>>> t.timeit(number=10000000)
3.765655994415283
>>> t.timeit(number=10000000)
3.7517099380493164
>>> t.timeit(number=10000000)
3.749257802963257
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<http://bugs.python.org/issue9980>
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