[Bug rtl-optimization/8361] [3.3/3.4/4.0 regression] C++ compile-time performance regression

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

------- Additional Comments From steven at gcc dot gnu dot org  2005-02-06 16:04 -------
All compilers were bootstrapped, with the following flags: 
 
"--disable-{nls,checking} --enable-languages=c,c++" 
 
Below, gcc40 is CVS HEAD.  This was on a 1.6GHz Opteron, with -m32. 
The machine has 4GB of memory so garbage collection times are zero, 
which may account for some of the rather unexpected results. 
For gcc34 and gcc40 I used generate-3.4.ii.bz2 (attachment 3) and 
for the other two I used the latest generate.ii.bz2 (attachment 4). 
 
        gcc32   gcc33   gcc34   gcc40 
-O0     16.439s 16.172s 15.223s 6.674s 
-O1     30.265s 25.115s 20.678s 20.305s 
-O2     42.678s 34.908s 34.526s 27.418s 
-O3     47.469s 47.538s 35.706s 27.896s 
 
I'll try to get numbers on a 32bits machine (i686) as well. 
 

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=8361