gcc/gcc/combine.c

36    LOG_LINKS does not have links for use of the CC0.  They don't
1061 /* Fill in log links field for all insns.  */
1074      register and establishing log links when def is encountered.
1089 	  /* Log links are created only once.  */
1120 	      /* Don't add duplicate links between instructions.  */
1121 	      struct insn_link *links;
1122 	      FOR_EACH_LOG_LINK (links, use_insn)
1123 	        if (insn == links->insn && regno == links->regno)
1126 	      if (!links)
1150   struct insn_link *links;
1151   FOR_EACH_LOG_LINK (links, b)
1152     if (links->insn == a)
1174   struct insn_link *links, *nextlinks;
1239             rtx links;
1250 	    for (links = REG_NOTES (insn); links; links = XEXP (links, 1))
1251 	      if (REG_NOTE_KIND (links) == REG_INC)
1252 	        set_nonzero_bits_and_sign_copies (XEXP (links, 0), NULL_RTX,
1315 	  /* Try this insn with each insn it links back to.  */
1317 	  FOR_EACH_LOG_LINK (links, insn)
1318 	    if ((next = try_combine (insn, links->insn, NULL,
1329 	    FOR_EACH_LOG_LINK (links, insn)
1331 		rtx_insn *link = links->insn;
1393 	  /* Finally, see if any of the insns that this insn links to
1396 	  FOR_EACH_LOG_LINK (links, insn)
1397 	      if (NONJUMP_INSN_P (links->insn)
1398 		  && GET_CODE (PATTERN (links->insn)) == SET
1399 		  && reg_mentioned_p (cc0_rtx, SET_SRC (PATTERN (links->insn)))
1400 		  && (prev = prev_nonnote_insn (links->insn)) != 0
1403 		  && (next = try_combine (insn, links->insn,
1412 	    FOR_EACH_LOG_LINK (links, insn)
1413 	      for (nextlinks = links->next; nextlinks;
1415 		if ((next = try_combine (insn, links->insn,
1427 	    FOR_EACH_LOG_LINK (links, insn)
1430 		rtx_insn *link = links->insn;
1465 		for (next1 = links->next; next1; next1 = next1->next)
1493 	  /* Try this insn with each REG_EQUAL note it links back to.  */
1494 	  FOR_EACH_LOG_LINK (links, insn)
1497 	      rtx_insn *temp = links->insn;
4489 	   I3's links points to an insn that sets I2DEST.  If it does,
5208      will not have been seen as equal above.  However, the log links code
12779   struct insn_link *links;
12787   for (links = LOG_LINKS (insn); links;)
12791       insn = links->insn;
12798 	  links = links->next;
12812 	  links = LOG_LINKS (insn);
13911 			  /* Move the notes and links of TEM_INSN elsewhere.
13980 			  struct insn_link *links = LOG_LINKS (place);
13982 			  distribute_links (links);
14114 distribute_links (struct insn_link *links)
14118   for (link = links; link; link = next_link)
14175 	 since most links don't point very far away.  */