On 01/21/2015 11:16 PM, Neil Girdhar wrote:
Why not have BUILD_MAP work like BUILD_LIST? I.e., STORE_MAP takes a parameter n and adds the last n pairs of stack elements into the n-1 stack element (the dictionary).
It probably wouldn't make much difference. Building a list is substantially cheaper if you have all the items on hand and can copy them in en masse. But adding an item to a dict entails quite a lot of overhead, since you need to hash the key, look for a free slot, etc. and this would likely swamp any gain from executing less bytecodes. And on the other side of the equation, evaluating the items one at a time requires less stack space, so the stack frame can be smaller. But as always, you can't be sure without measuring it, and this would be a good thing for someone interested to try out. -- Greg _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
