GCC Middle and Back End API Reference
move_by_pieces_d Class Reference
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Public Member Functions

 move_by_pieces_d (rtx to, rtx from, unsigned HOST_WIDE_INT len, unsigned int align)
rtx finish_retmode (memop_ret)
void run ()

Protected Member Functions

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

void generate (rtx, rtx, machine_mode) final override
bool prepare_mode (machine_mode, unsigned int) final override
fixed_size_mode get_usable_mode (fixed_size_mode, unsigned int)
fixed_size_mode smallest_fixed_size_mode_for_size (unsigned int)

Private Attributes

insn_gen_fn m_gen_fun

Constructor & Destructor Documentation

◆ move_by_pieces_d()

move_by_pieces_d::move_by_pieces_d ( rtx to,
rtx from,
unsigned HOST_WIDE_INT len,
unsigned int align )
inline

References false, MOVE_BY_PIECES, MOVE_MAX_PIECES, NULL, op_by_pieces_d::op_by_pieces_d(), PUSHG_P, and true.

Member Function Documentation

◆ finish_mode()

virtual void op_by_pieces_d::finish_mode ( machine_mode )
inlineprotectedvirtualinherited

Reimplemented in compare_by_pieces_d.

Referenced by run().

◆ finish_retmode()

rtx move_by_pieces_d::finish_retmode ( memop_ret retmode) 
Perform the final adjustment at the end of a string to obtain the
correct return value for the block operation.
Return value is based on RETMODE argument.

References gcc_assert, op_by_pieces_d::m_offset, op_by_pieces_d::m_reverse, op_by_pieces_d::m_to, and RETURN_END_MINUS_ONE.

◆ generate()

void move_by_pieces_d::generate ( rtx op0,
rtx op1,
machine_mode mode )
finaloverrideprivatevirtual 
A callback used when iterating for a compare_by_pieces_operation.
OP0 and OP1 are the values that have been loaded and should be
compared in MODE.  If OP0 is NULL, this means we should generate a
push; otherwise EXTRA_DATA holds a pointer to a pointer to the insn
gen function that should be used to generate the mode.

Implements op_by_pieces_d.

References emit_insn(), m_gen_fun, NULL, and NULL_RTX.

◆ get_usable_mode()

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

bool move_by_pieces_d::prepare_mode ( machine_mode mode,
unsigned int align )
finaloverrideprivatevirtual 
Return true if MODE can be used for a set of copies, given an
alignment ALIGN.  Prepare whatever data is necessary for later
calls to generate.

Implements op_by_pieces_d.

References GET_MODE_ALIGNMENT, m_gen_fun, and optab_handler().

◆ run()

void op_by_pieces_d::run ( )
inherited 
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 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, 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)
privateinherited 
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
protectedinherited

Referenced by get_usable_mode(), and op_by_pieces_d().

◆ m_from

pieces_addr op_by_pieces_d::m_from
protectedinherited

Referenced by op_by_pieces_d(), and run().

◆ m_gen_fun

insn_gen_fn move_by_pieces_d::m_gen_fun
private

Referenced by generate(), and prepare_mode().

◆ m_len

const unsigned HOST_WIDE_INT op_by_pieces_d::m_len
protectedinherited

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

◆ m_max_size

unsigned int op_by_pieces_d::m_max_size
protectedinherited

Referenced by op_by_pieces_d(), and run().

◆ m_offset

HOST_WIDE_INT op_by_pieces_d::m_offset
protectedinherited

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
protectedinherited

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
protectedinherited

Referenced by op_by_pieces_d(), and run().

◆ m_push

bool op_by_pieces_d::m_push
protectedinherited

Referenced by op_by_pieces_d(), and run().

◆ m_reverse

bool op_by_pieces_d::m_reverse
protectedinherited

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
protectedinherited

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

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