@Spectre660

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Oops! I'm so sorry ... I really did not remember. So I did not keep my promise ... I was too far too long ... but after an house, my third child and several job changes, I start again to have some free time

@kas1e

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Hieronymus is not as advanced as I would like but don't consider it dead yet

I have unreleased improvements that I would have to publish in a new version, to make it working in an alternative mode without machine restriction. And other things.
I was not aware about problems with Sam460.

@kas1e Great! Thank you for that. And I am sorry for not having answered to you and sent the diff. So you did it. I was not sure at all they will accept the patch, as any systems emulate the alignment exception on float accesses.

A comment above the structures could have been added to explain the reason for padding but that good enough.

I hope this engine will allow to provide new software.

@kas1e

Thank you for the links on models. I've sent you a modified loader by email, that could fix alignment problems in an easier way, padding the beginning of structures (still packed) in order to get the float fields aligned on 4 bytes. I dynamically allocate structures and copy the data to the address of the field Flags (just after the 3-byte padding).

I hope that will work!

@kas1e

I will be busy in the coming days but on the week-end, I will attend the Alchimie show here in France so I will be 2 days programming on Amiga with my friends (hey thellier!)

That could be nice to try to make it working there.

Could you provide a ms3d model? All files I find are corrupted archives or they failed to be extracted ...

@kas1e

Ok, you're right about the management of this kind of exception by Linux.

About speed: no difference, that's a matter of few instructions at load time.

What I proposer could certainly be cleaner but how you can avoid a copy in a structure that add an abstraction level, as the initial structure is badly aligned and playing with fields and padding won't give the expected result.

I will have to look at your example as I'm not so familiar with C++ and so I'm not sure to understand what you want to do there.

Glad to see that allowed you to go to the next steps ...

As you said, you will have to fix the part with MS3DTriangle, MS3DJoint, ...

Do you know if a working Linux PPC port exists?

@kas1e

I'm sorry again but I wrote the code being at work earlier today ... The compiler is right about uninitialized vertices, I omitted to allocate them!

MS3DVertex *vertices;
...
vertices = new MS3DVertex[numVertices];

And don't forget to free them at the end of the function:

delete [] vertices;

I hope that will work ... In any case, don't modify the organization of structures that match a binary chunk loaded from data file.

@kas1e

Oops, I am really sorry, I mixed 2 variants ...

You can comment the line:


Note that you certainly will also see a crash at:


Again, you can convert it replacing the line by this block:

@kas1e

I don't recommend to hack playing with optimization level: even if it stops crashing, that would be due to a side effect.

The problem is that the structure is directly loaded from the binary file. As salass0 said, the loader have to be modified.

I thought about this solution: The idea is to access float values from the loaded binary only with byte access.

- Declare a union to manage access with float and bytes, rename the struct MS3DVertex into MS3DVertexPacked and define a struct MS3DVertex without the PACK_STRUCT keyword:



- Modify the code (lines 206 to 225) by something like that (sorry, not able to compile and test here):



Additionally, about gcc options, avoid optimization options except -OX ones. And about -fexpensive-optimizations, the doc says it is activated with -O2 and stronger levels.

@broadblues

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This is why it was obvious that almost no apps would be written supporting this feature (reserved for motivated and skilled developers) and also because almost all apps don't need large amounts of memory.
I am glad to see that helped with SketchBlock but this feature should be entirely managed by the OS. Maybe one day ...

@Raziel

I recently looked for memory sticks for my X1000 but I didn't find 4 GB ones. So I thought that we could have 2 GB in each of the 4 slots, that is to say 8 GB max.
Anyway, that's not necessary to buy 16 GB betting they will be addressed by OS4 soon.

@thellier Using asm is not always (and even rarely) the solution. Before focusing no optimization, that's better to measure performance and then identify problems.

@thellier

Did you notice low performance on memcpy or CopyMem? Does it concern a specific board? If so, which one?

In the past, I realized benchmarks on memory operations and functions written by hand are rarely optimal (or better on some models but worst on some others).

@Raziel

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This gcc 5.4 is intended to become the official version but it is necessary to check that there are all features we need and that they work.
That's maybe not comfortable but joining our efforts, we will have a solid compiler (and tools ready for more recent version like 6.1).

Don't hesitate to create issues in the project on github.

@Raziel

Native compiler for OS4 and OS4 cross-compiler for Debian based Linux are available here:
https://github.com/sba1/adtools

That's well explained in the readme, that gives a link for direct download.

I use the latest:
https://dl.bintray.com/sba1/adtools-na ... ools-os4-20170623-404.lha

It seems there was at least one problem in the code:

try {
tf = bin ? luaU_undump1(z) : luaY_parser(z);
status = 0;
} else {

I'm not a C++ expert but it seems that throwing a char string is not a good ideally, an exception type should be preferred.

About the error "exception handling disabled, use -fexceptions to enable", I don't know ... I tried a similar case in a short example here and it works with g++ 5.4.

By the way, if you still use 5.3, you should update to 5.4, so you will be able to report some problems about the version that is in development here:
https://github.com/sba1/adtools/issues

Are not exceptions working by default (even without -fexceptions)?

@Raziel Could you provide an example and the error you get?

@MickJT Thank you for the detailed answer. My following question would have been about filling an issue on the adtools github, but you already answered

@MickJT

That's not clear for me which build environment (cross-compiler?) you use.

You mentioned adtools on sourceforge but it moved to:
https://github.com/adtools

If you're not using the official SDK, I recommend to look at:
https://github.com/sba1/adtools

You can get gcc (and binutils) to install on OS4 or Linux (Debian).

It was really an amazing week-end, guys!

Much fun, a concert, but there was also several contests (music, gfx, demos, ... with incredible Amstrad demos) and conferences (OS4 status, PowerPC notebook, FriendUp, ...).