Em dom., 19 de abr. de 2020 às 19:00, David Rowley <dgrowleyml@gmail.com> escreveu:
On Mon, 20 Apr 2020 at 09:38, Tom Lane <tgl@sss.pgh.pa.us> wrote: > The cases where Ranier proposes to replace strlen(foo) == 0 > with a test on foo[0] do seem like wins, though. Asking for > the full string length to be computed is more computation than > necessary, and it's less clear that the compiler could be > expected to save you from that. Anyway there's a coding style > proposition that we should be doing this consistently, and > certainly lots of places do do this without using strlen().
Looking at https://godbolt.org/z/6XsjbA it seems like GCC is pretty good at getting rid of the strlen call even at -O0. It takes -O1 for clang to use it and -O2 for icc.
