qty_table_elem Struct Reference

Collaboration diagram for qty_table_elem:

Data Fields
rtx	const_rtx
rtx_insn *	const_insn
rtx	comparison_const
int	comparison_qty
unsigned int	first_reg
unsigned int	last_reg
enum machine_mode	mode: MACHINE_MODE_BITSIZE
enum rtx_code	comparison_code: RTX_CODE_BITSIZE

Detailed Description

Per-qty information tracking.

`first_reg' and `last_reg' track the head and tail of the
chain of registers which currently contain this quantity.

`mode' contains the machine mode of this quantity.

`const_rtx' holds the rtx of the constant value of this
quantity, if known.  A summations of the frame/arg pointer
and a constant can also be entered here.  When this holds
a known value, `const_insn' is the insn which stored the
constant value.

`comparison_{code,const,qty}' are used to track when a
comparison between a quantity and some constant or register has
been passed.  In such a case, we know the results of the comparison
in case we see it again.  These members record a comparison that
is known to be true.  `comparison_code' holds the rtx code of such
a comparison, else it is set to UNKNOWN and the other two
comparison members are undefined.  `comparison_const' holds
the constant being compared against, or zero if the comparison
is not against a constant.  `comparison_qty' holds the quantity
being compared against when the result is known.  If the comparison
is not with a register, `comparison_qty' is INT_MIN.   

Field Documentation

comparison_code

enum rtx_code qty_table_elem::comparison_code

Referenced by fold_rtx(), make_new_qty(), and record_jump_cond().

comparison_const

rtx qty_table_elem::comparison_const

Referenced by fold_rtx(), and record_jump_cond().

comparison_qty

int qty_table_elem::comparison_qty

Referenced by fold_rtx(), and record_jump_cond().

const_insn

rtx_insn* qty_table_elem::const_insn

Referenced by insert_with_costs(), and make_new_qty().

const_rtx

rtx qty_table_elem::const_rtx

Referenced by cse_process_note_1(), equiv_constant(), insert_with_costs(), and make_new_qty().

first_reg

unsigned int qty_table_elem::first_reg

Referenced by canon_reg(), cse_insn(), delete_reg_equiv(), make_new_qty(), make_regs_eqv(), and try_back_substitute_reg().

last_reg

unsigned int qty_table_elem::last_reg

Referenced by delete_reg_equiv(), make_new_qty(), and make_regs_eqv().

mode

enum machine_mode qty_table_elem::mode

Referenced by canon_reg(), cse_insn(), equiv_constant(), fold_rtx(), insert_regs(), insert_with_costs(), make_new_qty(), and record_jump_cond().

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The documentation for this struct was generated from the following file:

• cse.cc