fwdVars map[ir.Node]*ssa.Value

	// all defined variables at the end of each block. Indexed by block ID.
	defvars []map[ir.Node]*ssa.Value

	// addresses of PPARAM and PPARAMOUT variables on the stack.
	decladdrs map[*ir.Name]*ssa.Value

	// starting values. Memory, stack pointer, and globals pointer
	startmem *ssa.Value
	sp       *ssa.Value
	sb       *ssa.Value