構造体定義書

struct iv_class

No.	名称	属性	説明
1	iv_class
	regno	int	Pseudo reg which is the biv.
	biv_count	int	Number of insns setting this reg.
	biv	induction *	List of all insns that set this reg.
	giv_count	int	Number of DEST_REG givs computed from this
	giv	induction *	List of all insns that compute a giv
	total_benefit	int	Sum of BENEFITs of all those givs
	initial_value	rtx	Value of reg at loop start
	initial_test	rtx	Test performed on BIV before loop
	next	iv_class *	Links all class structures together
	init_insn	rtx	insn which initializes biv, 0 if none.
	init_set	rtx	SET of INIT_INSN, if any.
	incremented	unsigned	1 if somewhere incremented/decremented
	eliminable	unsigned	1 if plausible candidate for elimination.
	nonneg	unsigned	1 if we added a REG_NONNEG note for this.
	reversed	unsigned	1 if we reversed the loop that this

iv_class