https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99693
--- Comment #4 from rafal at bursig dot org ---
but using -O2 -funswitch-loops will bring me those problems why this flag is
not in default -O2. Which is not a solution.
Maybe -O2 may have weaken version of this optimization and will work only if
one of if brock is empty. And -O3 will have full version.
Example:
form:
for(...)
{
if (local_value)
{
logic;
}
}
To:
if (local_value)
for(...)
{
logic;
}
I know that such code could be fixed by developer but gcc don't generate any
diagnostic message about such constructions and for a large project it's
difficult to find all of such places
