basically it is an optimized clone, but we have to consider the introduction of several (and heavy: llvm one for all) dependencies before include it in the pd release. 

 

i think that the introduction of a compiler could be usefull for the introduction of a scripting language in pd that can work at the three different time levels present in pd (control, audio and sample rate). for example, in pic1 taken from [1] we can see a gen~ patch.  so i think that jit_expr (and in general expr family) can read a text file, like the right one in picture, and interpret it. in this case, one can avoid to write externals and use jit_expr to compute the perform method. considering the case of a noise generator, one in principle can have this pseudocode:

static int val;

$y1 = ((float)((val & 0x7fffffff) - 0x40000000)) *

the pseudocode i wrote is just a mix of usual expr syntax and usual C syntax plus the problem of local variables where i use the static word.

the introduction of a jit compiler is usefull to faust-ize pd, in the sense that optimizing [fexpr~] several filters that usually are done in faust can be done in pd incrementing the possibility of using small block size.

honestly i do not like the namespace in pd, but i find this very usefull to switch from expr family to jit_expr. 

a final consideration about jit compilation: from my understanding of multithreading in computer music, not so much apart [pd~] can be done without breaking determinism. from one hand i see the possibility to introduce a steal working scheduler that breaks the dsp graph in sub-graphs and distribute them to threads (and divide some non-real time safe computation between threads, like soundfiler object and in general array operation); on other hand the possibility to jit-compile all the dsp graph is very interesting because it should leave all the black magic to the compiler and optimizing the patch reduces the need of parallelization. finally a combination of jit-compilation plus automatic parallelization would put this conversation on the heaven of computer music parallelization :)

best,

marco

[1]: https://docs.cycling74.com/max7/vignettes/gen_overview