[Python-Dev] Possible optimization for LOAD_FAST ? (original) (raw)
Victor Stinner victor.stinner at haypocalc.com
Sun Jan 2 14:17:27 CET 2011
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Le mercredi 29 décembre 2010 à 14:20 +0100, "Martin v. Löwis" a écrit :
Am 28.12.2010 18:08, schrieb Lukas Lueg: > Also, the > loadfast in lne 22 to reference x could be taken out of the loop as x > will always point to the same object....
That's not true; a debugger may change the value of x.
That's why Python has the following option:
-O : optimize generated bytecode slightly; also PYTHONOPTIMIZE=x
I regulary recompile programs with gcc -O0 -g to debug them. It is very difficult to debug (with gdb) a program compiled with gcc -O2: many variables are stored in registers, and gdb doesn't support that correctly.
Victor
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