web.cc File Reference

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "backend.h"
#include "rtl.h"
#include "df.h"
#include "insn-config.h"
#include "recog.h"
#include "tree-pass.h"

Include dependency graph for web.cc:

Data Structures
struct	web_entry

Functions
bool	unionfind_union (web_entry_base *first, web_entry_base *second)
static void	union_match_dups (rtx_insn *insn, web_entry *def_entry, web_entry *use_entry, bool(*fun)(web_entry_base *, web_entry_base *))
void	union_defs (df_ref use, web_entry *def_entry, unsigned int *used, web_entry *use_entry, bool(*fun)(web_entry_base *, web_entry_base *))
static rtx	entry_register (web_entry *entry, df_ref ref, unsigned int *used)
static void	replace_ref (df_ref ref, rtx reg)
rtl_opt_pass *	make_pass_web (gcc::context *ctxt)

Function Documentation

entry_register()

rtx entry_register ( web_entry * entry, df_ref ref, unsigned int * used )

static

Find the corresponding register for the given entry.   

References DF_REF_REAL_REG, dump_file, gen_reg_rtx(), GET_MODE, df_link::ref, web_entry::reg(), REG_ATTRS, REG_POINTER, REG_USERVAR_P, REGNO, web_entry::set_reg(), and web_entry_base::unionfind_root().

make_pass_web()

rtl_opt_pass * make_pass_web

(

gcc::context *

ctxt

)

replace_ref()

void replace_ref ( df_ref ref, rtx reg )

static

Replace the reference by REG.   

References df_insn_rescan(), DF_REF_INSN, DF_REF_INSN_UID, DF_REF_REAL_LOC, DF_REF_REAL_REG, dump_file, df_link::ref, and REGNO.

union_defs()

void union_defs	(	df_ref	use,
		web_entry *	def_entry,
		unsigned int *	used,
		web_entry *	use_entry,
		bool(*	fun )(web_entry_base *, web_entry_base *) )

For each use, all possible defs reaching it must come in the same
register, union them.
FUN is the function that does the union.

In USED, we keep the DF_REF_ID of the first uninitialized uses of a
register, so that all uninitialized uses of the register can be
combined into a single web.  We actually offset it by 2, because
the values 0 and 1 are reserved for use by entry_register.   

References DF_REF_CHAIN, DF_REF_FLAGS, DF_REF_ID, DF_REF_INSN_INFO, DF_REF_READ_WRITE, DF_REF_REAL_REG, DF_REF_REG, FOR_EACH_INSN_INFO_DEF, FOR_EACH_INSN_INFO_EQ_USE, df_insn_info::insn, link::next, NULL, REGNO, SET_DEST, SET_SRC, and single_set().

union_match_dups()

void union_match_dups ( rtx_insn * insn, web_entry * def_entry, web_entry * use_entry, bool(* fun )(web_entry_base *, web_entry_base *) )

static

For INSN, union all defs and uses that are linked by match_dup.
FUN is the function that does the union.   

References DF_INSN_INFO_DEFS, DF_INSN_INFO_GET, DF_INSN_INFO_USES, DF_REF_ID, DF_REF_LOC, DF_REF_NEXT_LOC, DF_REF_REAL_LOC, DF_REF_REGNO, extract_insn(), gcc_assert, i, df_insn_info::insn, NULL, OP_IN, OP_INOUT, and recog_data.

unionfind_union()

bool unionfind_union	(	web_entry_base *	first,
		web_entry_base *	second )

Union sets.
Return true if FIRST and SECOND points to the same web entry structure and
nothing is done.  Otherwise, return false.