New submission from Demur Rumed: This is a small change to comprehensions pass in their iterable rather than calling GET_ITER before CALL_FUNCTION. This makes it so that the compiler never generates GET_ITER without following it with FOR_ITER, nor does it generate FOR_ITER without preceding it by GET_ITER
This is the standalone portion of a more constructive patch I'm wanting to submit: Replace GET_ITER with a FOR_BEGIN which effectively acts as GET_ITER/FOR_ITER. Then modify FOR_ITER to replace the JUMP_ABSOLUTE by changing it to a JABS instruction which jumps if the iterator does not return null. This reduces the bytecode of by 2 bytes for every for loop & reduces the dispatch count per loop by 1 (As we merge GET_ITER/FOR_ITER & JUMP_ABSOLUTE/FOR_ITER) ---------- components: Interpreter Core files: gitfit.patch keywords: patch messages: 266400 nosy: Demur Rumed priority: normal severity: normal status: open title: Never have GET_ITER not followed by FOR_ITER type: performance versions: Python 3.6 Added file: http://bugs.python.org/file43006/gitfit.patch _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue27127> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
