[Python-Dev] opcode dispatch optimization (original) (raw)
Jason Orendorff jason.orendorff at gmail.com
Wed Dec 31 19:51:28 CET 2008
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On Wed, Dec 31, 2008 at 11:44 AM, Christian Heimes <lists at cheimes.de> wrote:
The patch makes use of a GCC feature where labels can be used as values: http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html . I didn't know about the feature and got confused by the unary && operator.
Right. SpiderMonkey (Mozilla's JavaScript interpreter) does this, and it was good for a similar win on platforms that use GCC. (It took me a while to figure out why it was so much faster, so I think this patch would be better with a few very specific comments!)
SpiderMonkey calls this optimization "threaded code" too, but this isn't the standard meaning of that term. See: http://en.wikipedia.org/wiki/Threaded_code
-j
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