gcc/gcc/combine.c

37    LOG_LINKS does not have links for use of the CC0.  They don't
474   register rtx links, nextlinks;
555 	  for (links = REG_NOTES (insn); links; links = XEXP (links, 1))
556 	    if (REG_NOTE_KIND (links) == REG_INC)
557 	      set_nonzero_bits_and_sign_copies (XEXP (links, 0), NULL_RTX);
590 	  /* Try this insn with each insn it links back to.  */
592 	  for (links = LOG_LINKS (insn); links; links = XEXP (links, 1))
593 	    if ((next = try_combine (insn, XEXP (links, 0), NULL_RTX)) != 0)
598 	  for (links = LOG_LINKS (insn); links; links = XEXP (links, 1))
599 	    for (nextlinks = LOG_LINKS (XEXP (links, 0)); nextlinks;
601 	      if ((next = try_combine (insn, XEXP (links, 0),
646 	  /* Finally, see if any of the insns that this insn links to
649 	  for (links = LOG_LINKS (insn); links; links = XEXP (links, 1))
650 	    if (GET_CODE (XEXP (links, 0)) == INSN
651 		&& GET_CODE (PATTERN (XEXP (links, 0))) == SET
652 		&& reg_mentioned_p (cc0_rtx, SET_SRC (PATTERN (XEXP (links, 0))))
653 		&& (prev = prev_nonnote_insn (XEXP (links, 0))) != 0
656 		&& (next = try_combine (insn, XEXP (links, 0), prev)) != 0)
662 	  for (links = LOG_LINKS (insn); links; links = XEXP (links, 1))
663 	    for (nextlinks = XEXP (links, 1); nextlinks;
665 	      if ((next = try_combine (insn, XEXP (links, 0),
2529 	   I3's links points to an insn that sets I2DEST.  If it does,
11737 			  /* Move the notes and links of TEM elsewhere.
11813 			rtx links = LOG_LINKS (place);
11815 			distribute_links (links);
11990 distribute_links (links)
11991      rtx links;
11995   for (link = links; link; link = next_link)
12006 	 register it was for.  Such links wouldn't be used by combine
12031 	 since most links don't point very far away.  */