[issue846388] Check for signals during regular expression matches

[Ralf Schmitt]

Ralf Schmitt added the comment:

./python Lib/timeit.py -n 1000000 -s "import
re;r=re.compile('a?a?a?a?a?aaaaa')" "r.match('aaaaa')" gives me for

Trunk:
1000000 loops, best of 3: 3.02 usec per loop
1000000 loops, best of 3: 2.99 usec per loop
1000000 loops, best of 3: 3.01 usec per loop

Patched:
1000000 loops, best of 3: 3.04 usec per loop
1000000 loops, best of 3: 3.04 usec per loop
1000000 loops, best of 3: 3.14 usec per loop

which would be ok, I guess.

(This is on a 64bit debian testing with gcc 4.2.3).

Can you test with the following:

if ((0 == (sigcount & 0xffffffff)) && PyErr_CheckSignals())

(i.e. the code will (nearly) not even call PyErr_CheckSignals).

I guess this is some c compiler optimization issue (seems like mine does
a better job at optimizing :)

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