In this simple testcase (file will be attached)
1) GCC 4.1 with -O2 produces code which runs two time slower than with -O3 thus
some optimizations are missing at -O2 because GCC 4.0.2 -O2 works OK and
produces results on par with -O3.
2) GCC 4.1 produces slightly slower code with -O3 than GCC 4.0.2 (with -O3).
P.S. -fregmove was used as an extra compiler flag.
--
Summary: [4.1 Regression]: some loop optimizations no longer run
at -O2
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: regression
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: t dot artem at mailcity dot com
GCC build triplet: i686-pc-linux-gnu-gcc
GCC host triplet: i686-pc-linux-gnu-gcc
GCC target triplet: i686-pc-linux-gnu-gcc
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26290
