Guido van Rossum <gu...@python.org> added the comment:
I've skimmed several papers by Stefan Brunthaler about something called Quickening that I first found via the Pyston blog, which linked to an ancient bpo issue with a patch created by Stefan (https://bugs.python.org/issue14757). The gist seems to be to have extra opcodes that only work for certain situations (e.g. INT_BINARY_ADD). In a hot function we can rewrite opcodes with their specialized counterpart. The new opcode contains a guard that rewrites itself back if the guard fails (and then it stays unoptimized). I think the idea is that it's pretty cheap to keep an extra pointer to a "alternate bytecode" array. ---------- nosy: +gvanrossum _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue42115> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
