Class description Instruction that inserts a conditional branch to a basic-block that garbage collects the nursery. The compiler.cfg.gc-checks vocab goes through each block in the cfg and checks if it allocates memory. If it does, then this instruction is inserted in the cfg before that block and checks if there is enough available space in the nursery. If it isn't, then a basic block containing code for garbage collecting the nursery is executed.
It has the following slots:
Number of bytes the next block in the cfg will allocate.