step 1. and 2. can be shortcut. We only took the long route because I didn't know you wanted a portable, not fully featured one (and to make sure that this works first before proceeding)
so it would be:
1. Install macports, in terminal run the commands

1sudo port install libsdl +universal +no_x11
2sudo port install libpng +universal
3sudo port install pkgconfig +universal

Step 2. is not necessary anymore (unless you installed libsdl_sound or libsdl_net before)

Have edited to make these corrections. Thanks again.

In step 1, remove the sudo install dosbox, otherwise you end up with all the stuff you don't want.

Urgh - I meant to do that and forgot. Next time I'll read my own post.

Dynrec core crashes because data is above 4GB (something that is not true for Windows and Linux). The first dosbox instruction (if I'm still doing this right 😀) is 0xcd which generates something like:

10x11e84c011:	mov    eax,DWORD PTR [rip-0x1e60f0f7]        # 0x10023cf20 <CPU_Cycles>
20x11e84c017:	cmp    eax,0x0
30x11e84c01a:	jle    0x11e84c06d
40x11e84c020:	sub    DWORD PTR ds:0x23cf20,0x1 

The first 3 instructions are the cycle check I think, the last one is the beginning from dyn_interrupt()->dyn_reduce_cycles()->gen_sub_direct_word()->gen_sub_direct_byte() and it's the one that crashes. Notice how it's trying to substract 1 from CPU_Cycles but the address is obviously wrong.
I don't remember exactly, but we had problems with x86_64 addressing. I do think that at the time the documentation said all data would be <2GB but this is obviously not the case anymore. It appears, x86_64 decoder would need to be rewritten to use RIP relative addressing to make it work on OS X.

I'll need to write this all up in the wiki, so we don't need to figure this all out again and again 😉
Thanks guli

Actually, something like gen_memaddr() should be used I guess...let's see how this works 😀

Are you actually testing this yourself or is there something I should test?

I'm testing it 😀

Dynrec core crashes because data is above 4GB (something that is not true for Windows and Linux).

I somewhen tried (shortly) to get it working on win64 but the problem was that
memory addressing would have been awkward as the malloc'd memory for the
generated code was at pretty high adresses whereas regular code was <4GB.
So the currently used 32bit-relative addressing did not work, and only [eax] was
additionally available iirc.

This seems to fix it...and hopefully not break anything else 😁

edit: Yeah, I guess the only problem remains when data>4GB and rip offset> +- 2GB. But at least dosbox will not segfault anymore but report the error.

cool, I try if I have time to try out later... and how it measures speedwise against 32bit dynamic

he he, had time right away to test it.
good news: it doesn't crash when I set core dynamic
bad news: it crashes when I start the PCPbench

When I set the core to dynamic before and then start the benchmark I get a sgmentation fault. When I leave it on auto, I get an "illegal instruction" crash.

There's a small typo in the patch...cache_addb(83) should actually read cache_addb(0x83). File updated 😁

still crashes pcpbench. This time I actually see the starting message of PCPbench before crashing. PCPBench can be downloaded from Benchmark Programs: Some suggestions please?

I have no idea this time why it crashes. Actually it works if you first run it with normal core and then repeat with dynrec 😀

true, but at less than half the speed the 32bit dyncore does 😀

Actually it works if you first run it with normal core and then repeat with dynrec

Maybe some strange caching effect, well...

but at less than half the speed the 32bit dyncore does

Of course, it's intended for 64bit only (or non-x86) systems.

For me it crashes in FPU_FCOS(), line fpu.regs[TOP].d = cos(fpu.regs[TOP].d);
Seems like something is wrong with math library, code generator correctly constructs the call to FPU_FCOS(), putting a printf at the top of the function works - it crashes at the cos() function.

Can you trace at that point? Can you check the real status and control word?