op_by_pieces_d Class Reference

Inheritance diagram for op_by_pieces_d:

Collaboration diagram for op_by_pieces_d:

Public Member Functions
	op_by_pieces_d (unsigned int, rtx, bool, rtx, bool, by_pieces_constfn, void *, unsigned HOST_WIDE_INT, unsigned int, bool, by_pieces_operation)
void	run ()

Protected Member Functions
virtual void	generate (rtx, rtx, machine_mode)=0
virtual bool	prepare_mode (machine_mode, unsigned int)=0
virtual void	finish_mode (machine_mode)

Protected Attributes
pieces_addr	m_to
pieces_addr	m_from
const unsigned HOST_WIDE_INT	m_len
HOST_WIDE_INT	m_offset
unsigned int	m_align
unsigned int	m_max_size
bool	m_reverse
bool	m_push
bool	m_overlap_op_by_pieces
by_pieces_operation	m_op

Private Member Functions
fixed_size_mode	get_usable_mode (fixed_size_mode, unsigned int)
fixed_size_mode	smallest_fixed_size_mode_for_size (unsigned int)

Detailed Description

This structure is used by do_op_by_pieces to describe the operation
to be performed.   

Constructor & Destructor Documentation

op_by_pieces_d()

op_by_pieces_d::op_by_pieces_d	(	unsigned int	max_pieces,
		rtx	to,
		bool	to_load,
		rtx	from,
		bool	from_load,
		by_pieces_constfn	from_cfn,
		void *	from_cfn_data,
		unsigned HOST_WIDE_INT	len,
		unsigned int	align,
		bool	push,
		by_pieces_operation	op )

The constructor for an op_by_pieces_d structure.  We require two
objects named TO and FROM, which are identified as loads or stores
by TO_LOAD and FROM_LOAD.  If FROM is a load, the optional FROM_CFN
and its associated FROM_CFN_DATA can be used to replace loads with
constant values.  MAX_PIECES describes the maximum number of bytes
at a time which can be moved efficiently.  LEN describes the length
of the operation.   

References alignment_for_piecewise_move(), by_pieces_ninsns(), pieces_addr::decide_autoinc(), gcc_unreachable, pieces_addr::get_addr_inc(), m_align, m_from, m_max_size, m_offset, m_op, m_overlap_op_by_pieces, m_reverse, m_to, MEM_ALIGN, MIN, MOVE_BY_PIECES, MOVE_MAX_PIECES, targetm, and widest_fixed_size_mode_for_size().

Member Function Documentation

finish_mode()

virtual void op_by_pieces_d::finish_mode ( machine_mode )

inlineprotectedvirtual

Reimplemented in compare_by_pieces_d.

Referenced by run().

generate()

virtual void op_by_pieces_d::generate ( rtx , rtx , machine_mode  )

protectedpure virtual

Implemented in compare_by_pieces_d, move_by_pieces_d, and store_by_pieces_d.

get_usable_mode()

fixed_size_mode op_by_pieces_d::get_usable_mode ( fixed_size_mode mode, unsigned int len )

private

This function returns the largest usable integer mode for LEN bytes
whose size is no bigger than size of MODE.   

References GET_MODE_SIZE(), m_align, m_op, prepare_mode(), and widest_fixed_size_mode_for_size().

Referenced by run().

prepare_mode()

virtual bool op_by_pieces_d::prepare_mode ( machine_mode , unsigned int  )

protectedpure virtual

Implemented in compare_by_pieces_d, move_by_pieces_d, and store_by_pieces_d.

Referenced by get_usable_mode().

run()

void op_by_pieces_d::run

(

)

This function contains the main loop used for expanding a block
operation.  First move what we can in the largest integer mode,
then go to successively smaller modes.  For every access, call
GENFUN with the two operands and the EXTRA_DATA.   

References pieces_addr::adjust(), by_pieces_prev::data, finish_mode(), generate(), GET_MODE_SIZE(), get_usable_mode(), m_from, m_len, m_max_size, m_offset, m_op, m_overlap_op_by_pieces, m_push, m_reverse, m_to, pieces_addr::maybe_postinc(), pieces_addr::maybe_predec(), by_pieces_prev::mode, NULL_RTX, smallest_fixed_size_mode_for_size(), and widest_fixed_size_mode_for_size().

smallest_fixed_size_mode_for_size()

fixed_size_mode op_by_pieces_d::smallest_fixed_size_mode_for_size ( unsigned int size )

private

Return the smallest integer or QI vector mode that is not narrower
than SIZE bytes.   

References by_pieces_mode_supported_p(), can_use_qi_vectors(), candidate(), FOR_EACH_MODE_IN_CLASS, GET_MODE_INNER, GET_MODE_SIZE(), is_a(), m_len, m_op, opt_mode< T >::require(), and smallest_int_mode_for_size().

Referenced by run().

Field Documentation

m_align

unsigned int op_by_pieces_d::m_align

protected

Referenced by get_usable_mode(), and op_by_pieces_d().

m_from

pieces_addr op_by_pieces_d::m_from

protected

Referenced by op_by_pieces_d(), and run().

m_len

const unsigned HOST_WIDE_INT op_by_pieces_d::m_len

protected

Referenced by run(), and smallest_fixed_size_mode_for_size().

m_max_size

unsigned int op_by_pieces_d::m_max_size

protected

Referenced by op_by_pieces_d(), and run().

m_offset

HOST_WIDE_INT op_by_pieces_d::m_offset

protected

Referenced by move_by_pieces_d::finish_retmode(), store_by_pieces_d::finish_retmode(), op_by_pieces_d(), and run().

m_op

by_pieces_operation op_by_pieces_d::m_op

protected

Referenced by get_usable_mode(), op_by_pieces_d(), run(), and smallest_fixed_size_mode_for_size().

m_overlap_op_by_pieces

bool op_by_pieces_d::m_overlap_op_by_pieces

protected

Referenced by op_by_pieces_d(), and run().

m_push

bool op_by_pieces_d::m_push

protected

Referenced by run().

m_reverse

bool op_by_pieces_d::m_reverse

protected

Referenced by move_by_pieces_d::finish_retmode(), store_by_pieces_d::finish_retmode(), op_by_pieces_d(), and run().

m_to

pieces_addr op_by_pieces_d::m_to

protected

Referenced by move_by_pieces_d::finish_retmode(), store_by_pieces_d::finish_retmode(), op_by_pieces_d(), and run().

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

• expr.cc