C compile time

[Andrew Pinski]

Dara,
For some reason (University of Cincinnati's network sucks), I cannot 
reply to the original message,
I also have to use list archives, :(.

Can you see how my patch in 10962 will help compile time (mostly it 
will help at -O0 but it could
help other places) on the mainline?
I have several patches which I will be submitting (after I get my 
copyright forms submitted, still
waiting for them to arrive), most of them removes invariant loads in 
loops (Shikari [shameless plug]
from the CHUD tools on Mac OS X are good to find these) and some which 
will cause sib calling to
happen more in some places.

Also did you compile the mainline and 3.5-tree-ssa with 
--disable-checking because it looks like you
did not from looking at the numbers?


Also for the mainline (and maybe 3.5-tree-ssa) could you run with 
-ftime-report, yes I know this will
report a lot of information but you could use a spread-sheet to look at 
the data and maybe give an idea
of where the problem is?

Thanks,
Andrew Pinski

> Hello,
>
> after Wolfgang's post about C++ compile times, my
> curiosity was piqued to check how C compile times have
> been going. I used compiling gcc 3.2.3's cc1 as the
> test.
>
> Hopefully this table gives some sense of where thing
> are at.
>
> gcc version     -O0     -O1     -O2     -O3
> 2.7.2.3         128.04  131.02  163.51  176.01
> 2.8.1           128.86  140.79  182.35  194.63
> 2.90.29         130.60  140.57  186.29  199.32
> 2.91.66         132.44  148.48  203.71  219.21
> 2.95.3          143.38  180.97  250.94  276.85
> 3.0.4           169.79  210.73  320.24  365.15
> 3.2.3           193.48  269.43  424.74  519.85
> 3.3             184.15  282.57  442.64  529.93
> 3.3-branch      184.15  283.89  443.66  535.10
> 3.4-mainline    203.58  326.35  514.49  783.59
> 3.5-tree-ssa    223.33  327.91  503.58  702.11
>
> icc* version    -O0     -O1*    -O2     -O3*
> 5.01*           158.47  ~       293.47  293.11
> 6.0             142.81  ~       227.25  227.88
> 7.1             153.95  ~       243.35  243.78
>
> *icc is Intel's C++ Compiler for Linux (unsupported
> noncommerical version)
> *icc sets -O1 and -O2 to be the same
> *icc claims -O2 and -O3 are different, but I'm not
> sure how, as compile time indicates
> *icc 5.0 would not compile df.c, so df.c was compiled
> with gcc for this test
>
> Test conducted was compiling cc1 from gcc 3.2.3 on
> i686-pc-linux-gnu with different versions of gcc. cvs
> snapshots for 3.3-branch, 3.4-mainline and
> 3.5-tree-ssa were from 20030614.
>
> Cheers,
>
> Dara