Collaboration diagram for pieces_addr:

[legend]

Public Member Functions
	pieces_addr (rtx, bool, by_pieces_constfn, void *)

rtx	adjust (fixed_size_mode, HOST_WIDE_INT, by_pieces_prev *=nullptr)

void	increment_address (HOST_WIDE_INT)

void	maybe_predec (HOST_WIDE_INT)

void	maybe_postinc (HOST_WIDE_INT)

void	decide_autoinc (machine_mode, bool, HOST_WIDE_INT)

int	get_addr_inc ()

Private Attributes
rtx	m_obj

rtx	m_addr

signed char	m_addr_inc

signed char	m_explicit_inc

bool	m_auto

bool	m_is_load

by_pieces_constfn	m_constfn

void *	m_cfndata

Detailed Description

Used when performing piecewise block operations, holds information
about one of the memory objects involved.  The member functions
can be used to generate code for loading from the object and
updating the address when iterating.

Constructor & Destructor Documentation

◆ pieces_addr()

pieces_addr::pieces_addr	(	rtx	obj,
		bool	is_load,
		by_pieces_constfn	constfn,
		void *	cfndata )

Initialize a pieces_addr structure from an object OBJ.  IS_LOAD is
true if the operation to be performed on this object is a load
rather than a store.  For stores, OBJ can be NULL, in which case we
assume the operation is a stack push.  For loads, the optional
CONSTFN and its associated CFNDATA can be used in place of the
memory load.

References gcc_assert, GET_CODE, m_addr, m_addr_inc, m_auto, m_explicit_inc, NULL, NULL_RTX, STACK_GROWS_DOWNWARD, and XEXP.

Member Function Documentation

◆ adjust()

rtx pieces_addr::adjust	(	fixed_size_mode	mode,
		HOST_WIDE_INT	offset,
		by_pieces_prev *	prev = nullptr )

Adjust the address to refer to the data at OFFSET in MODE.  If we
are using autoincrement for this address, we don't add the offset,
but we still modify the MEM's properties.

References adjust_address, adjust_automodify_address, m_addr, m_auto, m_cfndata, m_constfn, m_obj, NULL_RTX, and offset.

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

◆ decide_autoinc()

void pieces_addr::decide_autoinc	(	machine_mode	,
		bool	,
		HOST_WIDE_INT	)

Decide whether to use autoinc for an address involved in a memory op.
MODE is the mode of the accesses, REVERSE is true if we've decided to
perform the operation starting from the end, and LEN is the length of
the operation.  Don't override an earlier decision to set m_auto.

References CONSTANT_P, copy_to_mode_reg(), get_address_mode(), m_addr, m_auto, m_explicit_inc, m_is_load, m_obj, NULL_RTX, plus_constant(), USE_LOAD_POST_INCREMENT, USE_LOAD_PRE_DECREMENT, USE_STORE_POST_INCREMENT, and USE_STORE_PRE_DECREMENT.

Referenced by op_by_pieces_d::op_by_pieces_d().

◆ get_addr_inc()

int pieces_addr::get_addr_inc ( )

inline

References m_addr_inc.

Referenced by op_by_pieces_d::op_by_pieces_d().

◆ increment_address()

void pieces_addr::increment_address ( HOST_WIDE_INT size )

Emit an add instruction to increment the address by SIZE.

References emit_insn(), gen_add2_insn(), gen_int_mode(), GET_MODE, and m_addr.

Referenced by maybe_postinc(), and maybe_predec().

◆ maybe_postinc()

void pieces_addr::maybe_postinc ( HOST_WIDE_INT size )

If we are supposed to decrement the address after each access, emit code
to do so now.  Increment by SIZE.

References gcc_assert, HAVE_POST_INCREMENT, increment_address(), and m_explicit_inc.

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

◆ maybe_predec()

void pieces_addr::maybe_predec ( HOST_WIDE_INT size )

If we are supposed to decrement the address after each access, emit code
to do so now.  Increment by SIZE (which has should have the correct sign
already).

References gcc_assert, HAVE_PRE_DECREMENT, increment_address(), and m_explicit_inc.

Referenced by op_by_pieces_d::run().