Basic-block split — split

Increases CFG complexity by splitting each basic block into multiple sub-blocks connected by unconditional branches. A cheap structural multiplier — it inflates the block count that later CFG passes (bcf, flattening) then operate on.

Options

Key	Default	Range	Meaning
num / n	5	2–10	Split factor. Higher values create more blocks.

Example

__attribute__((annotate("obf: split(num=6)")))
int f(int x) { int a = x*3+7; for (int i=0;i<x;i++) a += (i^a); return a; }

On the shared 18-block sample function, split(num=6) expands the CFG from 18 to 54 blocks — more surface for downstream opaque predicates and dispatchers.

Feed the CFG passes

split on its own is weak (the extra edges are unconditional). Its value is as a pre-pass: run it before bcf/flattening so those passes have many more blocks to inject predicates and dispatcher cases into.