------- Comment #1 from pinskia at gcc dot gnu dot org 2006-12-13 16:33 -------
Actually there are two issues with this bug, one issue is that we change
(float)(CMP) into CMP?1.0:0.0 early on which in the end causes us to produce
three different versions of the inner loop. If we write the inner loop as:
for( int i = 0; i < 3; i++ )
for( int j = 0; j < 3; j++ )
{
bool a = (i == j);
(*this)(i, j) = a * factor;
}
And use -O3 -funroll-loops, we get the correct unrolled looped (though the
multiply is still there because of signed zeros).
And the second issue is unrolling the outer loop does not happen on the tree
level.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2006-12-13 16:33:34
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30201
