Re: [ooc-compiler] Language Shootout and GCC 3.3.4

[Stewart G. <sgr...@ii...>]

Hi Isaac,

> There are now a number of naive Oberon-2 implementations on "The Great
> Computer Language Shootout"
>
>    http://shootout.alioth.debian.org/lang/oberon2/
>
> It's using GCC 2.1.3 - are there plans to move to GCC 3.3.4?

I think you'll find that "2.1.3" is the OOC version, not the GCC 
version. oo2c should work fine with any recent version of gcc. 
Obviously, any improvements in gcc's optimisation will also benefit 
oo2c.

> Note: the Shootout is in the process of being updated, the remaining
> tests waiting for an implementor are: Echo Client/Server, Regular
> Expression Matching, Exceptions, Producer/Consumer Threads.
>
> New and improved implementations are welcome ;-)

Did you run the shootout benchmarks with or without run-time tests? 
Oberon-2 is a type-safe language, so there is extensive run-time 
testing in the generated code. If you want to compare performance 
against a language like "C" that is not type-safe, it is probably fair 
to disable all run-time tests. This is true particularly if your code 
includes pointers or arrays.

Note that the oo2c source base includes some simple benchmark tests, in 
which we compare the performance of oo2c-generated code to the 
"optimal" C equivalent. At least in these tests we find that the 
performance of the oo2c code is similar to that of optimised C. 
Occasionally, oo2c will spot an optimisation that gcc cannot find and 
we in fact get better performance from the oo2c-optimised code C code. 
For example, in the tests listed below the FFT benchmark exceeds the 
performance of the equivalent C code on all platforms that we tested.

Cheers,
   Stewart

------8<------

Summary of results for:

   Benchmark --all --normalise

All tests are based on oo2c-2.0.6.

--------

gcc-3.2.2, -march=pentium2 -O2, Mobile Pentium II, 400MHz (mva)

   Test             tests/sec % optimal
   -------------------------- -------
   ZeroArray1         16664.2  100.0%
   ZeroArray2         16661.0   99.9%
   ZeroArray4         16659.9  100.0%
   CopyArray1         11948.2   98.1%
   CopyArray2         11457.3  104.3%
   CopyArray4         10005.5   94.4%
   CopyArrayMove      13090.2  100.0%
   AddArray1           8788.5   97.0%
   AddArray2           9148.0   90.4%
   AddArray4          10929.0  100.6%
   ZeroArray1C        16671.6
   ZeroArray2C        16670.5
   ZeroArray4C        16662.0
   ZeroArrayBlockC    19696.7
   CopyArray1C        12182.5
   CopyArray2C        10983.1
   CopyArray4C        10603.7
   CopyArrayBlockC    13083.6
   AddArray1C          9058.8
   AddArray2C         10123.7
   AddArray4C         10864.7
   QSORT                369.9   99.3%
   QSORTC               372.6
   BSORT                157.6  100.0%
   BSORTC               157.6
   FFT                 4850.2  120.3%
   FFTC                4031.0
   FFT2                3661.4   87.5%
   FFT2C               4185.2
   -------------------------- -------

gcc-3.2.2, -march=athlon-xp -O2, Athlon XP 1800, 1.5GHz (mva)

   Test             tests/sec % optimal
   -------------------------- -------
   ZeroArray1         76099.6  100.0%
   ZeroArray2        101429.3  100.0%
   ZeroArray4        151342.4   99.7%
   CopyArray1         47038.2   77.5%
   CopyArray2         64995.7   99.5%
   CopyArray4         69222.1   99.9%
   CopyArrayMove      67671.9   99.8%
   AddArray1          34155.6   99.5%
   AddArray2          40611.0  102.8%
   AddArray4          40311.2  103.0%
   ZeroArray1C        76132.7
   ZeroArray2C       101439.1
   ZeroArray4C       151758.6
   ZeroArrayBlockC   150538.5
   CopyArray1C        60667.4
   CopyArray2C        65299.3
   CopyArray4C        69281.5
   CopyArrayBlockC    67807.6
   AddArray1C         34330.0
   AddArray2C         39521.2
   AddArray4C         39137.7
   QSORT               1168.4   89.9%
   QSORTC              1299.7
   BSORT                758.9  100.0%
   BSORTC               758.9
   FFT                22834.8  142.7%
   FFTC               16003.9
   FFT2               16659.9   90.2%
   FFT2C              18472.6
   -------------------------- -------

gcc-3.1, -O2, PPC G3, 700MHz (sg)

   Test             tests/sec % optimal
   -------------------------- -------
   ZeroArray1         23005.2   81.8%
   ZeroArray2         29637.5   94.6%
   ZeroArray4         37743.0  106.8%
   CopyArray1         15963.9   87.7%
   CopyArray2         18818.7   99.9%
   CopyArray4         19490.3  103.6%
   CopyArrayMove      24621.4   99.8%
   AddArray1           9139.0  114.9%
   AddArray2          10338.5  100.0%
   AddArray4          10965.6  102.0%
   ZeroArray1C        28136.1
   ZeroArray2C        31313.9
   ZeroArray4C        35324.6
   ZeroArrayBlockC    45881.5
   CopyArray1C        18200.7
   CopyArray2C        18829.5
   CopyArray4C        18818.7
   CopyArrayBlockC    24658.5
   AddArray1C          7955.8
   AddArray2C         10340.2
   AddArray4C         10750.7
   QSORT                268.5   60.7%
   QSORTC               442.7
   BSORT                153.4   99.9%
   BSORTC               153.5
   FFT                 6702.4  102.9%
   FFTC                6516.5
   FFT2                5580.4   98.5%
   FFT2C               5667.2
   -------------------------- -------