GCC 3.3 compile speed regression - THE GRAPH

[Fergus Henderson]

On 10-Feb-2003, Fergus Henderson <fjh@cs.mu.oz.au> wrote:
> gcc 		2.95.4		-c -O2 ...      		5.53
> gcc		2.95.4		-c -O1 ...      		3.19
> gcc		2.95.4		-c -O0 ...      		2.65
> gcc		2.95.4		-c -O0 -fsyntax-only ...      	1.16
> 
> gcc		3.4 20030209 	-c -O2 ...      	       10.16
> gcc		3.4 20030209 	-c -O1 ...      		5.10
> gcc		3.4 20030209 	-c -O0 ...      		4.03
> gcc		3.4 20030209 	-c -O0 -fsyntax-only ...      	0.87

Sorry, I screwed up.  Those results that I posted earlier were bogus,
because I forgot to configure with --disable-checking.
My apologies for the misinformation!

Here are the correct figures.  For `-O0', we've only slowed down to 9.7 times
slower than tcc, not 11.8 times slower as I wrongly said in my earlier post,
and the net slowdown since 0.95 is only 1.4 times the time it takes tcc,
not four times.

I also have figures for gcc 3.2 now.

tcc             0.9.16          -c                              0.34
lcc             4.1             -c                              1.04
gcc		2.95.4		-c -O0 ...      		2.65	base
gcc		3.2 		-c -O0 ...      		2.92	+10%
gcc		3.4  		-c -O0 ...      		3.30    +25%

gcc		2.95.4		-c -O1 ...      		3.00	base
gcc		3.2 		-c -O1 ...      		3.62	+21%
gcc		3.4  		-c -O1 ...      		4.10	+37%

gcc		2.95.4		-c -Os ...      		5.57	base
gcc		3.2 		-c -Os ...      		6.66	+20%
gcc		3.4  		-c -Os ...      		7.35    +32%

gcc		2.95.4		-c -O2 -fomit-frame-pointer ... 5.53	base
gcc		3.2 		-c -O2 -fomit-frame-pointer ... 7.08	+28%
gcc		3.4  		-c -O2 -fomit-frame-pointer ... 8.45	+53%

gcc		2.95.4		-c -O0 -fsyntax-only ...      	1.16	base
gcc		3.2		-c -O0 -fsyntax-only ...      	0.67	-42%
gcc		3.4 20030209 	-c -O0 -fsyntax-only ...      	0.67	-42%

The results are not very consistent from run to run (it was an unloaded
machine, but I didn't switch to single-user mode).  I took the best of
five runs.  But some of these figures might be off by 5% or thereabouts.

-- 
Fergus Henderson <fjh@cs.mu.oz.au>  |  "I have always known that the pursuit
The University of Melbourne         |  of excellence is a lethal habit"
WWW: <http://www.cs.mu.oz.au/~fjh>  |     -- the last words of T. S. Garp.