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[Bug target/19923] [4.0/4.1 Regression] openssl is slower when compiled with gcc 4.0 than 3.3


------- Additional Comments From dank at kegel dot com  2005-06-18 06:38 -------
To be clear, here are the two most worrying rows from the above table,
expanded a bit.  These are the runtimes of foo4.i in seconds.
The cpu family, model, and name are as shown by /proc/cpuinfo.

cpu family 15, model 2, Intel(R) Xeon(TM) CPU 2.60GHz:
-fPIC -mtune=pentium4 -O3 
gcc-2.95.3: 1.91 seconds
gcc-3.4.3:  3.89
gcc-4.0.0:  3.27

cpu family 6, model 8, Pentium III (Coppermine)
-fPIC -mtune=pentium3 -O3
gcc-2.95.3: 9.15
gcc-3.4.3: 10.10
gcc-4.0.0: 13.20

gcc-4.0.0 produces code that runs 1.7 and 1.4 times slower than gcc-2.95.3
on these (fairly common!) cpus, even when the proper -mtune is used.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19923


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