[Python-Dev] Accessing globals without dict lookup
Tim Peters
tim.one@comcast.net
Tue, 12 Feb 2002 15:17:50 -0500
[Tim]
> Speaking of which, why does LOAD_FAST waste time checking against NULL
> twice?!
[Neil Schemenauer]
> If you would have approved my patch it would be fixed already.
Heh. If you had entered the patch at priority 9, I might have gotten to it
by this summer. At priority 3, we're talking years <wink/sigh>. I boosted
it to 6. Note that the tiny patch I checked in also rearranged the code so
that the mormal case became the fall-through case:
if (normal)
do normal stuff
else do exceptional stuff
Most dumb compilers on platforms that care use a "forward branches probably
aren't taken, backward branches probably are" heuristic for setting
branch-prediction hints in the machine code; and on platforms that don't
care it's usually faster to fall through than to change the program counter
anyway.
> one-small-banana-left-ly y'rs Neil
is-that-an-american-or-canadian-banana?-ly y'rs - tim