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

[dank at kegel dot com]

------- Additional Comments From dank at kegel dot com  2005-06-17 00:59 -------
We're learning more about this bug.
Anthony Danalis has boiled down the testcase much further;
I'll attach the reduced testcase as foo4.i.

It looks like it shows up if your /proc/cpuinfo says

vendor_id       : GenuineIntel
cpu family      : 15
model           : 2
model name      : Intel(R) Pentium(R) 4 CPU 2.80GHz
stepping        : 9
cpu MHz         : 2793.051
cache size      : 512 KB

but not if your /proc/cpuinfo says
vendor_id       : GenuineIntel
cpu family      : 15
model           : 4
model name      : Intel(R) Pentium(R) 4 CPU 3.20GHz
stepping        : 1
cpu MHz         : 3200.255
cache size      : 1024 KB

But here's the fun part: on the newer CPU with the bigger
cache, gcc-2.95.3 was just as slow as gcc-3.4.3/gcc-4.0.0.
Go figure.

We'll add more details once we've got more info.



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