------- Additional Comments From yx at cs dot ucla dot edu 2005-06-01 20:47 ------- When we ran 'openssh speed md2', we did see that gcc-4.0 was slower than earlier versions, so we created a minimal test case, which we will attach. Here is how long it took to run a 34 megabyte file through the test program when compiled with various compilers and options:
gcc-2.95.3 -fPIC -O1 4.940s gcc-4.0.0 -fPIC -O1 3.510s gcc-3.4.3 -fPIC -O1 5.190s gcc-2.95.3 -fPIC -O2 3.470s gcc-3.4.3 -fPIC -O2 3.460s gcc-4.0.0 -fPIC -O2 4.050s gcc-2.95.3 -fPIC -O3 3.400s gcc-3.4.3 -fPIC -O3 3.740s gcc-4.0.0 -fPIC -O3 4.010s This test was done on a pentium 4 workstation, and no smoothing was done on the resulting times, but they seemed to be repeatable. We also tried without -fPIC, but did not see as large a regression there. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19923
