------- Comment #2 from jacob at math dot jussieu dot fr 2006-12-13 18:54
-------
Not understanding much in compiler stuff, I tried what you said, namely replace
the loop with
for( int i = 0; i < 3; i++ )
for( int j = 0; j < 3; j++ )
{
bool a = (i == j);
(*this)(i, j) = a * factor;
}
and compile with -O3 -funroll-loops, and toto ran in 1.1 seconds. That's better
than the original 1.9 seconds, but still far from the 0.3 seconds I get
manually unrolling the loop.
Do you think there is a chance to have this bug fixed in 4.2.x or 4.3.x ?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30201
