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.
David