This is the mail archive of the
gcc@gcc.gnu.org
mailing list for the GCC project.
Re: Compilation performance comparison of gcc3.4.1 and gcc3.5.0 2004-08-30on MICO sources
3.4.1:
expand : 0.79 ( 6%) usr 0.03 ( 1%) sys 0.78 ( 5%)
3.5.0-HEAD:
expand : 2.08 ( 9%) usr 0.07 ( 4%) sys 2.51 (10%) wall
Also:
3.4.1:
integration : 0.65 ( 5%) usr 0.00 ( 0%) sys 0.67 ( 4%) wall
global alloc : 0.91 ( 6%) usr 0.02 ( 1%) sys 0.83 ( 5%) wall
3.5.0-HEAD:
integration : 1.01 ( 4%) usr 0.06 ( 3%) sys 0.88 ( 3%) wall
global alloc : 1.16 ( 5%) usr 0.01 ( 1%) sys 1.34 ( 5%) wall
This is overall +0.5 seconds, which another 4%. And then:
DOM: 1.48 ( 6%) usr 0.02 ( 1%) sys 1.50 ( 6%) wall
There are quite high times for "tree SSA other", "tree conservative
DCE", "tree SSA rewrite" too.
Note that the parser and name lookup have indeed become faster which is
the result of Mark's work and part of the reason why -O0 is faster.
The -O2 times for 3.5 would help as well, I suspect -funit-at-a-time is
helping a lot.
Paolo