Paul Eggert <address@hidden> writes:
Konstantin Kharlamov wrote:
I was told that e.g. "cold" attribute can sometimes produce
unbearably slow
code https://gcc.gnu.org/ml/gcc-help/2019-01/msg00035.html
Although cold functions can be slow, it appears that overall it's a
win for
Emacs to mark _Noreturn error function declarations as cold: on my
platform,
'make compile-always' ran about 1.3% faster. So I installed the
attached patch
into master.
Thanks. What do you think about marking a few bytecode cases as
cold/unused? I've attached a diff below that does that. Does it make a
difference for you on your setup? It seems to slow Emacs down a slight
bit for me, but I was hoping you might know why it would do so. Since
the newly cold attributes should be unused, is this perhaps a GCC bug?