Usage question

[nelson2005]

in mptest.cpp, I saw something like

e1.create(ctx, "expression", mathpresso::kMPOptionNone)

and in mathpresso.cpp,

// Fallback to evaluation if JIT compiling failed or not enabled.

What might cause the JIT to fail? Is there some place in the interface where I can detect whether or not the JIT failed?

[kobalicek]

Well, the only reason to fail is if there is no memory (if heap or virtual allocation fails) or there is a bug in the JIT code generation. Normally, it shouldn't fail.

I think that this is historical, I wrote MathPresso initially for comparison between evaluated code and executed code. In MPSL there is no "evaluation" mode, for example.

[nelson2005]

Okay, thanks. I was intentionally sending in an expression with a syntax error to see how create() worked, and noticed that comment. My particular test was kicking out at the MPParser::parse() phase because I referenced an undefined variable.

[kobalicek]

I think you will be excited after you see MPSL, it's much more advanced than MathPresso, but also takes more time to develop :)

[nelson2005]

I am excited about it! Of course I realize that you have lots of other things that you're doing as well.

By the way, what's your sense about the speed of separate statements vs a single one? For example, would you expect "z = x + y; z+ 7" to be a different speed than "x + y + 7"?

[kobalicek]

It could be. MathPresso doesn't schedule the machine code generated, so if you reorder the expression a bit you can achieve better performance, but don't expect so much, it's unpredictable I think. Reordering is a task in asmjit I didn't finish yet, so this whole thing can be solved at a different layer without complicating MP itself.

BTW yeah, a lot of things I'm working on. I'm not that skilled in compiler construction so MPSL takes a lot of time, but I would like to release MPSL even before Blend2D.

[nelson2005]

Okay, thanks. Have you ever done any benchmarks comparing it to normally compiled code?

[nelson2005]

this is very nice, I'm having loads of fun with it. I can only imagine how good MPSL will be!