[Bug tree-optimization/31090] Revision 121302 causes 30% performance regression

["hjl at lucon dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #1 from hjl at lucon dot org  2007-03-08 20:04 -------
Created an attachment (id=13173)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13173&action=view)
A testcase

/usr/gcc-next/bin/gfortran -c -O2 -o 301.o test597.f90
/usr/gcc-next/bin/gfortran -o 301 301.o -Wl,-rpath,/usr/gcc-4.3/lib64
/usr/gcc-last/bin/gfortran -c -O2 -o 302.o test597.f90
/usr/gcc-next/bin/gfortran -o 302 302.o -Wl,-rpath,/usr/gcc-4.3/lib64
time ./301
0.92user 0.00system 0:00.93elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+2325minor)pagefaults 0swaps
time ./302
1.24user 0.00system 0:01.24elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+2325minor)pagefaults 0swaps
[hjl@gnu-25 597]$ /usr/gcc-next/bin/gfortran -v
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: /net/gnu-13/export/gnu/src/gcc-next/gcc/configure
--enable-clocale=gnu --with-system-zlib --enable-decimal-float=yes
--with-demangler-in-ld --enable-languages=c,fortran --enable-shared
--enable-threads=posix --enable-haifa --enable-checking=assert
--prefix=/usr/gcc-next --with-local-prefix=/usr/local
Thread model: posix
gcc version 4.3.0 20070129 (experimental) [trunk revision 121301]
[hjl@gnu-25 597]$ /usr/gcc-last/bin/gfortran -v
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: /net/gnu-13/export/gnu/src/gcc-last/gcc/configure
--enable-clocale=gnu --with-system-zlib --enable-decimal-float=yes
--with-demangler-in-ld --enable-languages=c,fortran --enable-shared
--enable-threads=posix --enable-haifa --enable-checking=assert
--prefix=/usr/gcc-last --with-local-prefix=/usr/local
Thread model: posix
gcc version 4.3.0 20070129 (experimental) [trunk revision 121302]


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31090