On 1/2/2011 8:17 AM, Victor Stinner wrote:
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
load_fast 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, you seem to be equating the gcc -O flag with the Python -O
flag. They are described similarly, but can't be used the same way. In
particular, there is no Python equivalent to gcc's -O0: there is no way
to disable the Python peephole optimizer.
--Ned.
Victor
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