What are the distinctive features of ISL and PPL for ClooG when using gcc?

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When building or using any given version of gcc, why I should prefer 1 of this 2 backends for ClooG over the other ?

I can't find a good documentation about it on the gcc website .

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wpoely86 On

You want to read this: https://gcc.gnu.org/wiki/Graphite-4.8

Basically, you cannot really choose. All newer version of GCC (>= 4.8) use CLooG with ISL. Older versions have a PPL backend.