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Re: EuroForth 2025 preliminary proceedings

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On 16-01-2026 18:38, Anton Ertl wrote:

On 17-01-2026 16:58, Hans Bezemer wrote:

I've done my thing, compiled 4tH with optimizations -O3 till -O0.
I thought, let's make this simple and execute ALL benchmarks I got. Some 
of them have become useless, though for the simple reason hardware has 
become that much better.

But still, here it is. Overall, the performance consistently 
deteriorates, aka -O3 gives the best performance. There are a few minor 
glitches, some due to random benchmark data.

For those curious, this is a European CSV with all the data. BTW, you 
can find all benchmarks here: 
https://sourceforge.net/p/forth-4th/code/HEAD/tree/trunk/4th.src/bench/

Hans Bezemer

---8<---
Benchmark;-O3;-O2;-O1;-O0
bench.4th;6.79;6.36;6.68;6.33
benchm.4th;1.21;1.66;1.86;2.8
benchxls.4th;0.06;0.08;0.08;0.12
bubble.4th;0.69;0.95;0.96;1.72
bytesiev.4th;0.01;0.01;0.01;0.02
countbit.4th;3.52;4.76;5.02;8.01
cowell.4th;15.15;20.2;18.91;31.29
fib.4th;0.79;1.02;1.02;1.72
isortest.4th;0.23;0.33;0.31;0.56
matrix.4th;0.22;0.31;0.3;0.51
misty.4th;0.58;0.84;1.01;1.59
pforth.4th;10.47;13.55;14.42;22.68
prims.4th;5.96;8;8.59;14.28
simple.4th;0.5;0.7;0.82;1.21
sortest.4th;140.96;163.68;150.17;270.87
thread.4th;0.35;0.41;0.49;0.7
---8<---

> Hans Bezemer <the.beez.speaks@gmail.com> writes:
>> On 15-01-2026 13:04, Anton Ertl wrote:
>>
>> A few observations concerning the IMHO most interesting paper,
>> "Code-Copying Compilation in Production":
> ...
>> 3. Commercial compilers (partly) using conventional compilers (see TF,
>> fig. 4.7) - that was new to me;
> 
> All Forth compilers I know work at the text interpretation level as
> the "Forth compiler" of Thinking Forth, Figure 4.7.
> 
>> 4. GCC -O1 outperforming GCC -O3 on some benchmarks. That's new to me
>> too. I might experiment with that one;
> 
> I have analyzed it for bubblesort.  There the problem is that gcc -O3
> auto-vectorizes the pair of loads and the pair of stores (when the two
> elements are swapped).  As a result, if a pair is stored in one
> iteration, the next iteration loads a pair that overlaps the
> previously stored pair.  This means that the hardware cannot use its
> fast path in store-to-load forwarding, and leads to a huge slowdown.
> For a benchmark that has been around for over 40 years.
> 
> In addition, the code generated by gcc -O3 also executes several
> additonal instructions per iteration, so I doubt that it would be
> faster even if the store-to-load forwarding problem did not exist.
> 
> For fib, I have also looked at the generated code, but have not
> understood it well enough to see why the code generated by gcc -O3 is
> slower.
> 
> - anton

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EuroForth 2025 preliminary proceedings dxf <dxforth@gmail.com> - 2026-01-15 17:41 +1100
  Re: EuroForth 2025 preliminary proceedings anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-01-15 12:04 +0000
    Re: EuroForth 2025 preliminary proceedings Hans Bezemer <the.beez.speaks@gmail.com> - 2026-01-16 15:25 +0100
      Re: EuroForth 2025 preliminary proceedings anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-01-16 17:38 +0000
        Re: EuroForth 2025 preliminary proceedings Hans Bezemer <the.beez.speaks@gmail.com> - 2026-01-22 16:51 +0100
          C compiler optimization and Forth engines (was: EuroForth 2025 ...) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-01-24 11:28 +0000
            Re: C compiler optimization and Forth engines (was: EuroForth 2025 ...) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-01-24 16:47 +0000
              Re: C compiler optimization and Forth engines (was: EuroForth 2025 ...) peter <peter.noreply@tin.it> - 2026-01-25 23:31 +0100
                Re: C compiler optimization and Forth engines (was: EuroForth 2025 ...) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-01-26 19:24 +0000
                Re: C compiler optimization and Forth engines (was: EuroForth 2025 ...) peter <peter.noreply@tin.it> - 2026-01-27 15:44 +0100
                Re: C compiler optimization and Forth engines (was: EuroForth 2025 ...) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-01-29 18:27 +0000
                Re: C compiler optimization and Forth engines (was: EuroForth 2025 ...) albert@spenarnc.xs4all.nl - 2026-01-30 13:20 +0100
                Re: C compiler optimization and Forth engines (was: EuroForth 2025 ...) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-01-30 18:00 +0000
      Re: EuroForth 2025 preliminary proceedings Paul Rubin <no.email@nospam.invalid> - 2026-01-16 23:10 -0800
        Re: EuroForth 2025 preliminary proceedings Hans Bezemer <the.beez.speaks@gmail.com> - 2026-01-17 16:58 +0100
          Re: EuroForth 2025 preliminary proceedings Paul Rubin <no.email@nospam.invalid> - 2026-01-17 20:21 -0800
            Re: EuroForth 2025 preliminary proceedings Hans Bezemer <the.beez.speaks@gmail.com> - 2026-01-18 15:26 +0100
          Re: EuroForth 2025 preliminary proceedings anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-01-18 22:17 +0000
        Re: EuroForth 2025 preliminary proceedings albert@spenarnc.xs4all.nl - 2026-01-18 16:34 +0100
          Re: EuroForth 2025 preliminary proceedings Paul Rubin <no.email@nospam.invalid> - 2026-01-20 00:35 -0800
            Re: EuroForth 2025 preliminary proceedings albert@spenarnc.xs4all.nl - 2026-01-20 12:12 +0100
            Coroutines in Forth Gerry Jackson <do-not-use@swldwa.uk> - 2026-04-02 20:59 +0100
              Re: Coroutines in Forth Paul Rubin <no.email@nospam.invalid> - 2026-04-04 18:02 -0700
                Re: Coroutines in Forth Paul Rubin <no.email@nospam.invalid> - 2026-04-04 21:21 -0700
        Re: EuroForth 2025 preliminary proceedings peter <peter.noreply@tin.it> - 2026-01-19 23:26 +0100
          Re: EuroForth 2025 preliminary proceedings Paul Rubin <no.email@nospam.invalid> - 2026-01-19 15:22 -0800
            Re: EuroForth 2025 preliminary proceedings peter <peter.noreply@tin.it> - 2026-01-20 10:44 +0100
            Re: EuroForth 2025 preliminary proceedings anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-01-20 22:36 +0000
          Re: EuroForth 2025 preliminary proceedings Paul Rubin <no.email@nospam.invalid> - 2026-01-20 00:33 -0800
          Re: EuroForth 2025 preliminary proceedings anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-01-20 22:17 +0000

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