------- Comment #18 from Joey dot ye at intel dot com 2008-10-24 08:36 ------- Created an attachment (id=16536) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=16536&action=view) Reduced performance case from cpu2006/454.calculix
50% regression with IRA core2 on trunk revsion 140514 and 141335 $ gcc -v Using built-in specs. Target: x86_64-unknown-linux-gnu Configured with: ../src/configure --disable-bootstrap --enable-languages=c,c++,fortran --enable-checking=assert Thread model: posix gcc version 4.4.0 20081024 (experimental) [trunk revision 141335] (GCC) $ gcc -m32 -O2 -mssse3 -mfpmath=sse 36.c $ time -p ./a.out real 7.97 $ gcc -m32 -O2 -mssse3 -mfpmath=sse -mtune=core2 -o core2.exe 36.c $ time -p ./core2.exe real 12.27 $ gcc -m32 -O2 -mssse3 -mfpmath=sse -mtune=core2 -fno-ira -o no-ira.exe 36.c $ time -p ./no-ira.exe real 8.03 -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37364
