On Thu, 2014-02-20 at 19:38 +0100, Armin Rigo wrote: > > Maybe you missed the point I made in the paragraph you quote? Without > a JIT, "a <op> b <op> c" cannot reasonably be done in a single > iteration over the three arrays. The pull request you quote improves > the memory and cache pressure by doing some assignments in-place, but > "a + b + c" still works in two passes: in pass one it writes > intermediate data that will be re-read in pass two.
Oh yes, you are right; I saw this pull request a couple of days ago, and now interpreted the quote thinking only in terms of removing extra memory allocations, which is, of course, only part of the problem. Still, I hope you found it interesting that they are at least trying to get rid of extra temporaries :-) Otherwise, sorry for the noise. -- Sincerely yours, Yury V. Zaytsev _______________________________________________ pypy-dev mailing list pypy-dev@python.org https://mail.python.org/mailman/listinfo/pypy-dev
