#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "backend.h"
#include "target.h"
#include "rtl.h"
#include "df.h"
#include "memmodel.h"
#include "tm_p.h"
#include "insn-config.h"
#include "regs.h"
#include "emit-rtl.h"
#include "recog.h"
#include "addresses.h"
#include "cfganal.h"
#include "tree-pass.h"
#include "function-abi.h"
#include "regrename.h"

Include dependency graph for regrename.cc:

Data Structures
struct	incoming_reg_info

class	bb_rename_info

Enumerations
enum	scan_actions { terminate_write , terminate_dead , mark_all_read , mark_read , mark_write , mark_access }

Functions
static void	scan_rtx (rtx_insn , rtx , enum reg_class, enum scan_actions, enum op_type)

static bool	build_def_use (basic_block)

du_head_p	regrename_chain_from_id (unsigned int id)

static void	dump_def_use_chain (int from)

static void	free_chain_data (void)

static void	mark_conflict (class du_head *chains, unsigned id)

static void	record_operand_use (class du_head head, struct du_chain this_du)

static du_head_p	create_new_chain (unsigned this_regno, unsigned this_nregs, rtx loc, rtx_insn insn, enum reg_class cl)

static void	merge_overlapping_regs (HARD_REG_SET pset, class du_head head)

static bool	call_clobbered_in_chain_p (du_head *this_head, machine_mode mode, unsigned int regno)

static bool	check_new_reg_p (int reg, int new_reg, class du_head *this_head, HARD_REG_SET this_unavailable)

int	find_rename_reg (du_head_p this_head, enum reg_class super_class, HARD_REG_SET *unavailable, int old_reg, bool best_rename)

reg_class	regrename_find_superclass (du_head_p head, int pn_uses, HARD_REG_SET punavailable)

static void	rename_chains (void)

static void	init_rename_info (class bb_rename_info *p, basic_block bb)

static void	set_incoming_from_chain (class bb_rename_info *ri, du_head_p chain)

static void	merge_chains (du_head_p c1, du_head_p c2)

void	regrename_analyze (bitmap bb_mask, bool include_all_block_p)

bool	regrename_do_replace (class du_head *head, int reg)

static bool	verify_reg_in_set (rtx op, HARD_REG_SET *pset)

static bool	verify_reg_tracked (rtx op)

static void	note_sets_clobbers (rtx x, const_rtx set, void *data)

static void	scan_rtx_reg (rtx_insn insn, rtx loc, enum reg_class cl, enum scan_actions action, enum op_type type)

static reg_class	base_reg_class_for_rename (rtx_insn *insn, machine_mode mode, addr_space_t as, rtx_code code, rtx_code index_code)

static void	scan_rtx_address (rtx_insn insn, rtx loc, enum reg_class cl, enum scan_actions action, machine_mode mode, addr_space_t as)

static void	hide_operands (int n_ops, rtx old_operands, rtx old_dups, unsigned HOST_WIDE_INT do_not_hide, bool inout_and_ec_only)

static void	restore_operands (rtx_insn insn, int n_ops, rtx old_operands, rtx *old_dups)

static void	record_out_operands (rtx_insn insn, bool earlyclobber, insn_rr_info insn_info)

void	regrename_init (bool insn_info)

void	regrename_finish (void)

static unsigned int	regrename_optimize (void)

rtl_opt_pass *	make_pass_regrename (gcc::context *ctxt)

Enumeration Type Documentation

◆ scan_actions

enum scan_actions

Register renaming for the GNU compiler.
Copyright (C) 2000-2024 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

GCC is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
License for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.

This file implements the RTL register renaming pass of the compiler.  It is
 a semi-local pass whose goal is to maximize the usage of the register file
 of the processor by substituting registers for others in the solution given
 by the register allocator.  The algorithm is as follows:

   1. Local def/use chains are built: within each basic block, chains are
      opened and closed; if a chain isn't closed at the end of the block,
      it is dropped.  We pre-open chains if we have already examined a
      predecessor block and found chains live at the end which match
      live registers at the start of the new block.

   2. We try to combine the local chains across basic block boundaries by
      comparing chains that were open at the start or end of a block to
      those in successor/predecessor blocks.

   3. For each chain, the set of possible renaming registers is computed.
      This takes into account the renaming of previously processed chains.
      Optionally, a preferred class is computed for the renaming register.

   4. The best renaming register is computed for the chain in the above set,
      using a round-robin allocation.  If a preferred class exists, then the
      round-robin allocation is done within the class first, if possible.
      The round-robin allocation of renaming registers itself is global.

   5. If a renaming register has been found, it is substituted in the chain.

Targets can parameterize the pass by specifying a preferred class for the
renaming register for a given (super)class of registers to be renamed.

DEBUG_INSNs are treated specially, in particular registers occurring inside
them are treated as requiring ALL_REGS as a class.

Enumerator
terminate_write
terminate_dead
mark_all_read
mark_read
mark_write
mark_access

Function Documentation

◆ base_reg_class_for_rename()

static reg_class base_reg_class_for_rename	(	rtx_insn *	insn,
		machine_mode	mode,
		addr_space_t	as,
		rtx_code	code,
		rtx_code	index_code )

static

A wrapper around base_reg_class which returns ALL_REGS if INSN is a
DEBUG_INSN.  The arguments MODE, AS, CODE and INDEX_CODE are as for
base_reg_class.

References base_reg_class(), DEBUG_INSN_P, ggc_alloc(), and du_chain::insn.

Referenced by scan_rtx(), and scan_rtx_address().

◆ build_def_use()

static bool build_def_use ( basic_block bb )

static

Build def/use chain.

References ADDR_SPACE_GENERIC, alternative_class(), asm_noperands(), BB_END, BB_HEAD, du_head::call_abis, du_head::call_clobber_mask, CALL_INSN_FUNCTION_USAGE, CALL_P, recog_data_d::constraints, create_new_chain(), cur_operand, DEBUG_BIND_INSN_P, recog_data_d::dup_loc, recog_data_d::dup_num, extract_constrain_insn(), fail_current_block, find_regno_note(), GET_CODE, GET_MODE, GET_MODE_SIZE(), ggc_alloc(), du_head::hard_conflicts, hide_operands(), i, IN_RANGE, insn_callee_abi(), insn_rr, INSN_UID(), INSN_VAR_LOCATION_LOC, live_hard_regs, live_in_chains, mark_access, mark_all_read, mark_read, recog_data_d::n_dups, recog_data_d::n_operands, du_head::next_chain, NEXT_INSN(), NONDEBUG_INSN_P, note_sets_clobbers(), note_stores(), NULL, OP_IN, insn_rr_info::op_info, OP_INOUT, OP_OUT, open_chains, recog_data_d::operand, recog_data_d::operand_loc, recog_data_d::operand_mode, recog_data_d::operand_type, ORIGINAL_REGNO, PATTERN(), preprocess_constraints(), recog_data, record_out_operands(), REG_NOTE_KIND, REG_NOTES, REG_NREGS, REG_P, REGNO, remove_from_hard_reg_set(), rename_obstack, restore_operands(), scan_rtx(), scan_rtx_address(), SET, SET_DEST, terminate_dead, terminate_write, terminated_this_insn, VAR_LOC_UNKNOWN_P, verify_reg_in_set(), verify_reg_tracked(), which_op_alt(), XEXP, and XVECEXP.

Referenced by regrename_analyze().

◆ call_clobbered_in_chain_p()

static bool call_clobbered_in_chain_p	(	du_head *	this_head,
		machine_mode	mode,
		unsigned int	regno )

static

Return true if (reg:MODE REGNO) would be clobbered by a call covered
by THIS_HEAD.

References call_clobbered_in_region_p(), and ggc_alloc().

Referenced by check_new_reg_p().

◆ check_new_reg_p()

static bool check_new_reg_p	(	int	reg,
		int	new_reg,
		class du_head *	this_head,
		HARD_REG_SET	this_unavailable )

static

Check if NEW_REG can be the candidate register to rename for
REG in THIS_HEAD chain.  THIS_UNAVAILABLE is a set of unavailable hard
registers.

References call_clobbered_in_chain_p(), crtl, DEBUG_INSN_P, df_regs_ever_live_p(), fixed_regs, GET_MODE, ggc_alloc(), global_regs, HARD_REGNO_RENAME_OK, i, targetm, and TEST_HARD_REG_BIT.

Referenced by find_rename_reg().

◆ create_new_chain()

static du_head_p create_new_chain	(	unsigned	this_regno,
		unsigned	this_nregs,
		rtx *	loc,
		rtx_insn *	insn,
		enum reg_class	cl )

static

Create a new chain for THIS_NREGS registers starting at THIS_REGNO,
and record its occurrence in *LOC, which is being written to in INSN.
This access requires a register of class CL.

References bitmap_copy(), bitmap_default_obstack, bitmap_initialize(), bitmap_set_bit, du_chain::cl, CLEAR_HARD_REG_BIT, current_id, dump_file, head::first, ggc_alloc(), id_to_chain, du_chain::insn, INSN_UID(), head::last, live_hard_regs, live_in_chains, du_chain::loc, mark_conflict(), NULL, NULL_RTX, open_chains, open_chains_set, record_operand_use(), reg_names, rename_obstack, and SET_HARD_REG_BIT.

Referenced by build_def_use(), init_rename_info(), and scan_rtx_reg().

◆ dump_def_use_chain()

static void dump_def_use_chain ( int from )

static

Dump all def/use chains, starting at id FROM.

References dump_file, head::first, FOR_EACH_VEC_ELT_FROM, ggc_alloc(), i, id_to_chain, INSN_UID(), reg_class_names, and reg_names.

Referenced by regrename_analyze().

◆ find_rename_reg()

int find_rename_reg	(	du_head_p	this_head,
		enum reg_class	super_class,
		HARD_REG_SET *	unavailable,
		int	old_reg,
		bool	best_rename )

For the chain THIS_HEAD, compute and return the best register to
rename to.  SUPER_CLASS is the superunion of register classes in
the chain.  UNAVAILABLE is a set of registers that cannot be used.
OLD_REG is the register currently used for the chain.  BEST_RENAME
controls whether the register chosen must be better than the
current one or just respect the given constraint.

References check_new_reg_p(), DEBUG_INSN_P, ggc_alloc(), merge_overlapping_regs(), noop_move_p(), reg_class_contents, targetm, TEST_HARD_REG_BIT, and tick.

Referenced by rename_chains().

◆ free_chain_data()

static void free_chain_data ( void )

static

References bitmap_clear(), i, and id_to_chain.

Referenced by regrename_finish().

◆ hide_operands()

static void hide_operands	(	int	n_ops,
		rtx *	old_operands,
		rtx *	old_dups,
		unsigned HOST_WIDE_INT	do_not_hide,
		bool	inout_and_ec_only )

static

Hide operands of the current insn (of which there are N_OPS) by
substituting pc for them.
Previous values are stored in the OLD_OPERANDS and OLD_DUPS.
For every bit set in DO_NOT_HIDE, we leave the operand alone.
If INOUT_AND_EC_ONLY is set, we only do this for OP_INOUT type operands
and earlyclobbers.

References recog_data_d::constraints, recog_data_d::dup_loc, recog_data_d::dup_num, ggc_alloc(), i, recog_data_d::n_dups, OP_INOUT, recog_data_d::operand, recog_data_d::operand_loc, recog_data_d::operand_type, pc_rtx, recog_data, and which_op_alt().

Referenced by build_def_use().

◆ init_rename_info()

static void init_rename_info	(	class bb_rename_info *	p,
		basic_block	bb )

static

Initialize a rename_info structure P for basic block BB, which starts a new
scan.

References bb_rename_info::bb, bitmap_clear(), bitmap_default_obstack, bitmap_initialize(), bitmap_set_bit, CLEAR_HARD_REG_SET, create_new_chain(), df_get_live_in(), DF_REF_AT_TOP, DF_REF_FLAGS, DF_REF_REGNO, dump_file, FOR_EACH_ARTIFICIAL_DEF, ggc_alloc(), i, bb_rename_info::incoming, bb_rename_info::incoming_open_chains_set, basic_block_def::index, live_hard_regs, live_in_chains, NULL, open_chains, open_chains_set, bb_rename_info::open_chains_set, range_in_hard_reg_set_p(), REG_SET_TO_HARD_REG_SET, remove_range_from_hard_reg_set(), SET_HARD_REG_BIT, and TEST_HARD_REG_BIT.

Referenced by regrename_analyze().

◆ make_pass_regrename()

rtl_opt_pass * make_pass_regrename ( gcc::context * ctxt )

References ggc_alloc().

◆ mark_conflict()

static void mark_conflict	(	class du_head *	chains,
		unsigned	id )

static

Walk all chains starting with CHAINS and record that they conflict with
another chain whose id is ID.

References bitmap_set_bit, du_head::conflicts, and du_head::next_chain.

Referenced by create_new_chain().

◆ merge_chains()

static void merge_chains	(	du_head_p	c1,
		du_head_p	c2 )

static

Merge the two chains C1 and C2 so that all conflict information is
recorded and C1, and the id of C2 is changed to that of C1.

References bitmap_ior_into(), ggc_alloc(), and NULL.

Referenced by regrename_analyze().

◆ merge_overlapping_regs()

static void merge_overlapping_regs	(	HARD_REG_SET *	pset,
		class du_head *	head )

static

For a def-use chain HEAD, find which registers overlap its lifetime and
set the corresponding bits in *PSET.

References EXECUTE_IF_SET_IN_BITMAP, gcc_assert, ggc_alloc(), i, regrename_chain_from_id(), and SET_HARD_REG_BIT.

Referenced by find_rename_reg().

◆ note_sets_clobbers()

static void note_sets_clobbers	(	rtx	x,
		const_rtx	set,
		void *	data )

static

Called through note_stores.  DATA points to a rtx_code, either SET or
CLOBBER, which tells us which kind of rtx to look at.  If we have a
match, record the set register in live_hard_regs and in the hard_conflicts
bitmap of open chains.

References add_to_hard_reg_set(), gcc_assert, GET_CODE, GET_MODE, ggc_alloc(), HARD_REGISTER_P, live_hard_regs, open_chains, REG_P, REGNO, and SUBREG_REG.

Referenced by build_def_use().

◆ record_operand_use()

static void record_operand_use	(	class du_head *	head,
		struct du_chain *	this_du )

static

Examine cur_operand, and if it is nonnull, record information about the
use THIS_DU which is part of the chain HEAD.

References operand_rr_info::chains, cur_operand, operand_rr_info::failed, gcc_assert, ggc_alloc(), operand_rr_info::heads, operand_rr_info::n_chains, and NULL.

Referenced by create_new_chain(), and scan_rtx_reg().

◆ record_out_operands()

static void record_out_operands	(	rtx_insn *	insn,
		bool	earlyclobber,
		insn_rr_info *	insn_info )

static

For each output operand of INSN, call scan_rtx to create a new
open chain.  Do this only for normal or earlyclobber outputs,
depending on EARLYCLOBBER.  If INSN_INFO is nonnull, use it to
record information about the operands in the insn.

References alternative_class(), asm_noperands(), CALL_P, du_head::cannot_rename, du_chain::cl, cur_operand, recog_data_d::dup_loc, recog_data_d::dup_num, ggc_alloc(), i, du_chain::loc, mark_write, recog_data_d::n_dups, recog_data_d::n_operands, NULL, insn_rr_info::op_info, OP_OUT, open_chains, recog_data_d::operand_loc, recog_data_d::operand_type, ORIGINAL_REGNO, PATTERN(), recog_data, REG_P, REGNO, scan_rtx(), terminate_write, and which_op_alt().

Referenced by build_def_use().

◆ regrename_analyze()

void regrename_analyze	(	bitmap	bb_mask,
		bool	include_all_block_p )

Analyze the current function and build chains for renaming.
If INCLUDE_ALL_BLOCKS_P is set to true, process all blocks,
ignoring BB_DISABLE_SCHEDULE.  The default value is true.

References basic_block_def::aux, BASIC_BLOCK_FOR_FN, bb_rename_info::bb, bitmap_bit_p, bitmap_clear(), bitmap_copy(), bitmap_default_obstack, bitmap_initialize(), build_def_use(), cfun, current_id, df_get_live_in(), df_get_live_out(), dump_def_use_chain(), dump_file, EXECUTE_IF_SET_IN_BITMAP, FOR_BB_INSNS, FOR_EACH_BB_FN, FOR_EACH_EDGE, free(), ggc_alloc(), i, id_to_chain, basic_block_def::index, init_rename_info(), insn_rr, INSN_UID(), last_basic_block_for_fn, merge_chains(), n_basic_blocks_for_fn, NULL, insn_rr_info::op_info, open_chains, open_chains_set, pre_and_rev_post_order_compute(), basic_block_def::preds, range_overlaps_hard_reg_set_p(), reg_names, REG_SET_TO_HARD_REG_SET, regrename_chain_from_id(), set_incoming_from_chain(), and basic_block_def::succs.

Referenced by regrename_optimize().

◆ regrename_chain_from_id()

du_head_p regrename_chain_from_id ( unsigned int id )

Return the chain corresponding to id number ID.  Take into account that
chains may have been merged.

References ggc_alloc(), du_head::id, and id_to_chain.

Referenced by merge_overlapping_regs(), and regrename_analyze().

◆ regrename_do_replace()

bool regrename_do_replace	(	class du_head *	head,
		int	reg )

Attempt to replace all uses of the register in the chain beginning with
HEAD with REG.  Returns true on success and false if the replacement is
rejected because the insns would not validate.  The latter can happen
e.g. if a match_parallel predicate enforces restrictions on register
numbering in its subpatterns.

References apply_change_group(), DEBUG_INSN_P, head::first, gen_raw_REG(), gen_rtx_UNKNOWN_VAR_LOC, GET_MODE, ggc_alloc(), hard_regno_nregs(), INSN_VAR_LOCATION_LOC, NULL_RTX, ORIGINAL_REGNO, REG_ATTRS, REG_POINTER, REGNO, and validate_change().

Referenced by rename_chains().

◆ regrename_find_superclass()

reg_class regrename_find_superclass	(	du_head_p	head,
		int *	pn_uses,
		HARD_REG_SET *	punavailable )

Iterate over elements in the chain HEAD in order to:
1. Count number of uses, storing it in *PN_USES.
2. Narrow the set of registers we can use for renaming, adding
   unavailable registers to *PUNAVAILABLE, which must be
   initialized by the caller.
3. Compute the superunion of register classes in this chain
   and return it.

References DEBUG_INSN_P, head::first, ggc_alloc(), and reg_class_superunion.

Referenced by rename_chains().

◆ regrename_finish()

void regrename_finish ( void )

Free all global data used by the register renamer.

References free_chain_data(), ggc_alloc(), insn_rr, NULL, and rename_obstack.

Referenced by regrename_optimize().

◆ regrename_init()

void regrename_init ( bool insn_info )

Initialize the register renamer.  If INSN_INFO is true, ensure that
insn_rr is nonnull.

References gcc_obstack_init, get_max_uid(), insn_rr, and rename_obstack.

Referenced by regrename_optimize().

◆ regrename_optimize()

static unsigned int regrename_optimize ( void )

static

Perform register renaming on the current function.

References df_analyze(), DF_DEFER_INSN_RESCAN, DF_LR_RUN_DCE, df_note_add_problem(), df_set_flags(), NULL, regrename_analyze(), regrename_finish(), regrename_init(), and rename_chains().

◆ rename_chains()

static void rename_chains ( void )

static

Perform register renaming on the current function.

References add_to_hard_reg_set(), CLEAR_HARD_REG_SET, df_set_regs_ever_live(), dump_file, find_rename_reg(), fixed_regs, FOR_EACH_VEC_ELT, frame_pointer_needed, ggc_alloc(), global_regs, HARD_FRAME_POINTER_IS_FRAME_POINTER, HARD_FRAME_POINTER_REGNUM, i, id_to_chain, INSN_UID(), reg_names, regrename_do_replace(), regrename_find_superclass(), this_tick, and tick.

Referenced by regrename_optimize().

◆ restore_operands()

static void restore_operands	(	rtx_insn *	insn,
		int	n_ops,
		rtx *	old_operands,
		rtx *	old_dups )

static

Undo the substitution performed by hide_operands.  INSN is the insn we
are processing; the arguments are the same as in hide_operands.

References df_insn_rescan(), recog_data_d::dup_loc, ggc_alloc(), i, du_chain::insn, recog_data_d::n_dups, recog_data_d::operand_loc, and recog_data.

Referenced by build_def_use().

◆ scan_rtx()

static void scan_rtx	(	rtx_insn *	insn,
		rtx *	loc,
		enum reg_class	cl,
		enum scan_actions	action,
		enum op_type	type )

static

References base_reg_class_for_rename(), CASE_CONST_ANY, du_chain::cl, gcc_unreachable, GET_CODE, GET_MODE, GET_RTX_FORMAT, GET_RTX_LENGTH, ggc_alloc(), i, du_chain::insn, du_chain::loc, MEM_ADDR_SPACE, OP_IN, OP_INOUT, OP_OUT, PATTERN(), scan_rtx(), scan_rtx_address(), scan_rtx_reg(), SET, SET_DEST, SET_SRC, verify_reg_tracked(), XEXP, XVECEXP, and XVECLEN.

Referenced by build_def_use(), record_out_operands(), and scan_rtx().

◆ scan_rtx_address()

static void scan_rtx_address	(	rtx_insn *	insn,
		rtx *	loc,
		enum reg_class	cl,
		enum scan_actions	action,
		machine_mode	mode,
		addr_space_t	as )

static

Adapted from find_reloads_address_1.  CL is INDEX_REG_CLASS or
BASE_REG_CLASS depending on how the register is being considered.

References AUTO_INC_DEC, base_reg_class_for_rename(), du_chain::cl, DEBUG_INSN_P, GET_CODE, GET_MODE, GET_RTX_FORMAT, GET_RTX_LENGTH, ggc_alloc(), i, du_chain::insn, du_chain::loc, mark_access, mark_all_read, mark_write, MEM_ADDR_SPACE, NULL, OP_IN, REGNO, regno_ok_for_base_p(), RTX_CODE, scan_rtx_address(), scan_rtx_reg(), SUBREG_REG, XEXP, XVECEXP, and XVECLEN.

Referenced by build_def_use(), scan_rtx(), and scan_rtx_address().

◆ scan_rtx_reg()

static void scan_rtx_reg	(	rtx_insn *	insn,
		rtx *	loc,
		enum reg_class	cl,
		enum scan_actions	action,
		enum op_type	type )

static

◆ set_incoming_from_chain()

static void set_incoming_from_chain	(	class bb_rename_info *	ri,
		du_head_p	chain )

static

Record in RI that the block corresponding to it has an incoming
live value, described by CHAIN.

References dump_file, ggc_alloc(), i, and incoming_reg_info::nregs.

Referenced by regrename_analyze().

◆ verify_reg_in_set()

static bool verify_reg_in_set	(	rtx	op,
		HARD_REG_SET *	pset )

static

Return true if OP is a reg for which all bits are set in PSET, false
if all bits are clear.
In other cases, set fail_current_block and return false.

References fail_current_block, ggc_alloc(), REG_NREGS, REG_P, REGNO, and TEST_HARD_REG_BIT.

Referenced by build_def_use(), and verify_reg_tracked().

◆ verify_reg_tracked()

static bool verify_reg_tracked ( rtx op )

static

Return true if OP is a reg that is being tracked already in some form.
May set fail_current_block if it sees an unhandled case of overlap.

References live_hard_regs, live_in_chains, and verify_reg_in_set().

Referenced by build_def_use(), and scan_rtx().

Variable Documentation

◆ cur_operand

operand_rr_info* cur_operand

static

Set while scanning RTL if INSN_RR is nonnull, i.e. if the current analysis
is for a caller that requires operand data.  Used in
record_operand_use.

Referenced by build_def_use(), record_operand_use(), and record_out_operands().

◆ current_id

unsigned current_id

static

The id to be given to the next opened chain.

Referenced by create_new_chain(), and regrename_analyze().

◆ fail_current_block

bool fail_current_block

static

True if we found a register with a size mismatch, which means that we
can't track its lifetime accurately.  If so, we abort the current block
without renaming.

Referenced by build_def_use(), scan_rtx_reg(), and verify_reg_in_set().

◆ id_to_chain

vec<du_head_p> id_to_chain

static

A mapping of unique id numbers to chains.

Referenced by create_new_chain(), dump_def_use_chain(), free_chain_data(), regrename_analyze(), regrename_chain_from_id(), and rename_chains().

◆ insn_rr

vec<insn_rr_info> insn_rr

If nonnull, the code calling into the register renamer requested
information about insn operands, and we store it here.

Referenced by build_def_use(), regrename_analyze(), regrename_finish(), and regrename_init().

◆ live_hard_regs

HARD_REG_SET live_hard_regs

static

Record the registers that are live but not tracked.  The intersection
between this and live_in_chains is empty.

Referenced by build_def_use(), create_new_chain(), do_remat(), inherit_in_ebb(), init_rename_info(), note_sets_clobbers(), scan_rtx_reg(), and verify_reg_tracked().

◆ live_in_chains

HARD_REG_SET live_in_chains

static

Record the registers being tracked in open_chains.

Referenced by build_def_use(), create_new_chain(), init_rename_info(), scan_rtx_reg(), and verify_reg_tracked().

◆ open_chains

class du_head* open_chains

static

List of currently open chains.

Referenced by build_def_use(), create_new_chain(), init_rename_info(), note_sets_clobbers(), record_out_operands(), regrename_analyze(), and scan_rtx_reg().

◆ open_chains_set

bitmap_head open_chains_set

static

Bitmap of open chains.  The bits set always match the list found in
open_chains.

Referenced by create_new_chain(), init_rename_info(), regrename_analyze(), and scan_rtx_reg().

◆ rename_obstack

struct obstack rename_obstack

static

Referenced by build_def_use(), create_new_chain(), regrename_finish(), regrename_init(), and scan_rtx_reg().

◆ scan_actions_name

const char* const scan_actions_name[]

static

Initial value:

=
{
  "terminate_write",
  "terminate_dead",
  "mark_all_read",
  "mark_read",
  "mark_write",
  "mark_access"
}

Referenced by scan_rtx_reg().

◆ terminated_this_insn

class du_head* terminated_this_insn

static

Set while scanning RTL if a register dies.  Used to tie chains.

Referenced by build_def_use(), and scan_rtx_reg().

◆ this_tick

int this_tick = 0

static

Referenced by rename_chains().

◆ tick

int tick[FIRST_PSEUDO_REGISTER]

static

TICK and THIS_TICK are used to record the last time we saw each
register.

Referenced by find_rename_reg(), get_last_value_validate(), graphds_dfs(), and rename_chains().

Variables
static const char *const	scan_actions_name []

static int	tick [FIRST_PSEUDO_REGISTER]

static int	this_tick = 0

static struct obstack	rename_obstack

vec< insn_rr_info >	insn_rr

static unsigned	current_id

static vec< du_head_p >	id_to_chain

static class du_head *	open_chains

static bitmap_head	open_chains_set

static HARD_REG_SET	live_in_chains

static HARD_REG_SET	live_hard_regs

static operand_rr_info *	cur_operand

static class du_head *	terminated_this_insn

static bool	fail_current_block

Data Structures

Enumerations

Functions

Variables

Enumeration Type Documentation

◆ scan_actions

Function Documentation

◆ base_reg_class_for_rename()

◆ build_def_use()

◆ call_clobbered_in_chain_p()

◆ check_new_reg_p()

◆ create_new_chain()

◆ dump_def_use_chain()

◆ find_rename_reg()

◆ free_chain_data()

◆ hide_operands()

◆ init_rename_info()

◆ make_pass_regrename()

◆ mark_conflict()

◆ merge_chains()

◆ merge_overlapping_regs()

◆ note_sets_clobbers()

◆ record_operand_use()

◆ record_out_operands()

◆ regrename_analyze()

◆ regrename_chain_from_id()

◆ regrename_do_replace()

◆ regrename_find_superclass()

◆ regrename_finish()

◆ regrename_init()

◆ regrename_optimize()

◆ rename_chains()

◆ restore_operands()

◆ scan_rtx()

◆ scan_rtx_address()

◆ scan_rtx_reg()

◆ set_incoming_from_chain()

◆ verify_reg_in_set()

◆ verify_reg_tracked()

Variable Documentation

◆ cur_operand

◆ current_id

◆ fail_current_block

◆ id_to_chain

◆ insn_rr

◆ live_hard_regs

◆ live_in_chains

◆ open_chains

◆ open_chains_set

◆ rename_obstack

◆ scan_actions_name

◆ terminated_this_insn

◆ this_tick

◆ tick