Enrico Weigelt wrote:
many specific cases of standard library function calls, eg.
snprintf (buf, sizeof(buf), "%s%s", a, b)
could be optimized to a few assembler lines, since in those
cases the compiler knows exactly whats happening here.
Does gcc yet support such optimizations ?
Yes. For example, have a look at expand_builtin_fprintf() and
expand_builtin_strcpy() in
http://gcc.gnu.org/viewcvs/trunk/gcc/builtins.c?view=markup
You could do something similar by parsing a snprintf string and
converting it to expand_builtin_strcpy().
Andrew.
