Some numbers on gcc compiling itself

[Steven Bosscher]

Hi,

These numbers are user times in seconds of GCC compiling its own
preprocessed sources of gcc mainline 20040914) on i686.
The numbers are averages of three runs, and I have only picked those
files for which the compile time is relatively large.  Here is the top
10 slowdowns and the 2 largest speedups:

file		3.3.3 (hammer)	cvs-20041030	slowdown %
insn-recog.i	28.62		41.57		45.25
insn-attrtab.i	27.58		37.69		36.66
parse.i		10.94		12.55		14.72
combine.i	6.81		8.02		17.77
gcc.i		4.2		6.46		53.81
reload.i	5.38		6.88		27.88
reload1.i	4.74		6.38		34.6
loop.i		4.99		5.76		15.43
genautomata.i	4.06		5.23		28.82
cse.i		3.92		4.77		21.68
insn-emit.i	6.9		5.92		-14.2
c-common.i	8.56		5.73		-33.06


The total compile time for all 643 .i files:

                3.3.3 (hammer)  cvs-20041030    slowdown %
TOTAL		417.38		484.75		16.14


The total compile time for all 643 .i files, *excluding* the top 10
slowdowns shown above:

                3.3.3 (hammer)  cvs-20041030    slowdown %
TOTAL		316.14		349.44		10.53																																																																																																																																																																																																																																																												

The "3.3.3 (hammer)" compiler is the SLES9 system compiler, which is
build with a profiledbootstrap, so part of the slowdown can probably
be explained with that.  But it's still pretty depressing to see all
these slowdowns :-/

Gr.
Steven