md.texi: Document define_subst.

        * doc/md.texi: Document define_subst.
        * gensupport.c (MAX_OPERANDS): New define.
        (operand_data): New.
        (match_operand_entries_in_pattern): New.
        (used_operands_numbers): New.
        (subst_true): New.
        (subst_false): New.
        (define_subst_queue): New.
        (define_subst_tail): New.
        (define_subst_attr_queue): New.
        (define_subst_attr_tail): New.
        (has_subst_attribute): New.
        (subst_pattern_match): New.
        (get_alternatives_number): New.
        (alter_output_for_subst_insn): New.
        (alter_attrs_for_subst_insn): New.
        (process_substs_on_one_elem): New.
        (subst_dup): New.
        (process_define_subst): New.
        (duplicate_alternatives): New.
        (duplicate_each_alternative): New.
        (constraints_handler_t): New typedef.
        (alter_constraints): New.
        (adjust_operands_numbers): New.
        (replace_duplicating_operands_in_pattern): New.
        (remove_from_queue): New.
        (process_rtx): Handle define_subst and define_subst_attr.
        (change_subst_attribute): New.
        (alter_predicate_for_insn): Fix formatting.
        (alter_attrs_for_insn): Likewise.
        (alter_output_for_insn): Likewise.
        (mark_operands_from_match_dup): New.
        (mark_operands_used_in_match_dup): New.
        (find_first_unused_number_of_operand): New.
        (renumerate_operands_in_pattern): New.
        (generate_match_dup): New.
        (check_define_attr_duplicates): New.
        (init_rtx_reader_args_cb): Add checking for duplicated attrs and
        processing of define_subst.
        (read_md_rtx): Handle define_subst.
        * read-rtl.c (struct subst_attr_to_iter_mapping): New.
        (substs): New global.
        (apply_subst_iterator): New.
        (bind_subst_iter_and_attr): New.
        (find_subst_iter_by_attr): New.
        (map_attr_string): Handle subst-iterators.
        (add_condition_to_rtx): Handle define_subst.
        (apply_iterators): Likewise.
        (initialize_iterators): Likewise.
        (add_define_attr_for_define_subst): New.
        (add_define_subst_attr): New.
        (read_subst_mapping): New.
        (read_rtx): Handle define_subst_attr.
        (read_rtx_code): Add subst-attributes recognition during reading of
        strings.
        * rtl.def (DEFINE_EXPAND): Add vector of attributes.
        (DEFINE_SUBST): New.
        (DEFINE_SUBST_ATTR): New.


Co-Authored-By: Kirill Yukhin <kirill.yukhin@intel.com>
Co-Authored-By: Michael Zolotukhin <michael.v.zolotukhin@intel.com>

From-SVN: r193618

gcc/ChangeLog

+2012-11-19  Maxim Kuznetsov  <maxim.kuznetsov@intel.com>
+	    Kirill Yukhin  <kirill.yukhin@intel.com>
+	    Michael Zolotukhin  <michael.v.zolotukhin@intel.com>
+
+	* doc/md.texi: Document define_subst.
+	* gensupport.c (MAX_OPERANDS): New define.
+	(operand_data): New.
+	(match_operand_entries_in_pattern): New.
+	(used_operands_numbers): New.
+	(subst_true): New.
+	(subst_false): New.
+	(define_subst_queue): New.
+	(define_subst_tail): New.
+	(define_subst_attr_queue): New.
+	(define_subst_attr_tail): New.
+	(has_subst_attribute): New.
+	(subst_pattern_match): New.
+	(get_alternatives_number): New.
+	(alter_output_for_subst_insn): New.
+	(alter_attrs_for_subst_insn): New.
+	(process_substs_on_one_elem): New.
+	(subst_dup): New.
+	(process_define_subst): New.
+	(duplicate_alternatives): New.
+	(duplicate_each_alternative): New.
+	(constraints_handler_t): New typedef.
+	(alter_constraints): New.
+	(adjust_operands_numbers): New.
+	(replace_duplicating_operands_in_pattern): New.
+	(remove_from_queue): New.
+	(process_rtx): Handle define_subst and define_subst_attr.
+	(change_subst_attribute): New.
+	(alter_predicate_for_insn): Fix formatting.
+	(alter_attrs_for_insn): Likewise.
+	(alter_output_for_insn): Likewise.
+	(mark_operands_from_match_dup): New.
+	(mark_operands_used_in_match_dup): New.
+	(find_first_unused_number_of_operand): New.
+	(renumerate_operands_in_pattern): New.
+	(generate_match_dup): New.
+	(check_define_attr_duplicates): New.
+	(init_rtx_reader_args_cb): Add checking for duplicated attrs and
+	processing of define_subst.
+	(read_md_rtx): Handle define_subst.
+	* read-rtl.c (struct subst_attr_to_iter_mapping): New.
+	(substs): New global.
+	(apply_subst_iterator): New.
+	(bind_subst_iter_and_attr): New.
+	(find_subst_iter_by_attr): New.
+	(map_attr_string): Handle subst-iterators.
+	(add_condition_to_rtx): Handle define_subst.
+	(apply_iterators): Likewise.
+	(initialize_iterators): Likewise.
+	(add_define_attr_for_define_subst): New.
+	(add_define_subst_attr): New.
+	(read_subst_mapping): New.
+	(read_rtx): Handle define_subst_attr.
+	(read_rtx_code): Add subst-attributes recognition during reading of
+	strings.
+	* rtl.def (DEFINE_EXPAND): Add vector of attributes.
+	(DEFINE_SUBST): New.
+	(DEFINE_SUBST_ATTR): New.
+
 2012-11-19  Tom de Vries  <tom@codesourcery.com>
 
 	PR rtl-optimization/55315

gcc/rtl.def

@@ -906,8 +906,9 @@ DEF_RTL_EXPR(DEFINE_PEEPHOLE2, "define_peephole2", "EsES", RTX_EXTRA)
 	This might, for example, create some RTX's and store them in
 	elements of `recog_data.operand' for use by the vector of
 	insn-patterns.
-	(`operands' is an alias here for `recog_data.operand').  */
-DEF_RTL_EXPR(DEFINE_EXPAND, "define_expand", "sEss", RTX_EXTRA)
+	(`operands' is an alias here for `recog_data.operand').
+   5th: optionally, a vector of attributes for this expand.  */
+DEF_RTL_EXPR(DEFINE_EXPAND, "define_expand", "sEssV", RTX_EXTRA)
 
 /* Define a requirement for delay slots.
    1st operand: Condition involving insn attributes that, if true,
@@ -1280,6 +1281,8 @@ DEF_RTL_EXPR (ATTR_FLAG, "attr_flag", "s", RTX_EXTRA)
    true, the second operand will be used as the value of the conditional.  */
 DEF_RTL_EXPR(COND, "cond", "Ee", RTX_EXTRA)
 
+DEF_RTL_EXPR(DEFINE_SUBST, "define_subst", "sEsE", RTX_EXTRA)
+DEF_RTL_EXPR(DEFINE_SUBST_ATTR, "define_subst_attr", "ssss", RTX_EXTRA)
 #endif /* GENERATOR_FILE */
 
 /*