contrib/gcc/combine.c

32    We try to combine each pair of insns joined by a logical link.
34    C has a link back to B and B has a link back to A.
39    insn as having a logical link to the preceding insn.  The same is true
72    Therefore, every JUMP_INSN is taken to have an implicit logical link
842 		  rtx link = XEXP (links, 0);
846 		  if (NOTE_P (link))
849 		  for (nextlinks = LOG_LINKS (link);
852 		    if ((next = try_combine (insn, link,
1154   rtx link;
1415   for (link = REG_NOTES (insn); link; link = XEXP (link, 1))
1416     if (REG_NOTE_KIND (link) == REG_INC
1418 	    || reg_used_between_p (XEXP (link, 0), insn, i3)
1420 		&& reg_overlap_mentioned_p (XEXP (link, 0), PATTERN (pred)))
1422 		&& reg_overlap_mentioned_p (XEXP (link, 0), PATTERN (succ)))
1423 	    || reg_overlap_mentioned_p (XEXP (link, 0), PATTERN (i3))))
1857   rtx link;
2205     for (link = REG_NOTES (i3); link; link = XEXP (link, 1))
2206       if (REG_NOTE_KIND (link) == REG_INC
2207 	  && (reg_overlap_mentioned_p (XEXP (link, 0), PATTERN (i2))
2209 		  && reg_overlap_mentioned_p (XEXP (link, 0), PATTERN (i1)))))
3057       rtx link;
3069 	 a LOG_LINK pointing at I3.  We must remove this link.
3070 	 The simplest way to remove the link is to point it at I1,
3087 	      for (link = LOG_LINKS (insn); link;
3088 		   link = XEXP (link, 1))
3089 		if (XEXP (link, 0) == i3)
3090 		  XEXP (link, 0) = i1;
3186 		for (link = LOG_LINKS (temp); link; link = XEXP (link, 1))
3187 		  if (XEXP (link, 0) == i2)
3188 		    XEXP (link, 0) = i3;
3192 	    rtx link = i3notes;
3193 	    while (XEXP (link, 1))
3194 	      link = XEXP (link, 1);
3195 	    XEXP (link, 1) = i2notes;
3330 	rtx link;
3341 	for (link = LOG_LINKS (i3); link; link = XEXP (link, 1))
3342 	  if ((set = single_set (XEXP (link, 0))) != 0
3344 	    i2_insn = XEXP (link, 0), i2_val = SET_SRC (set);
3361 	rtx link;
3364 	for (link = LOG_LINKS (i3); link; link = XEXP (link, 1))
3365 	  if ((set = single_set (XEXP (link, 0))) != 0
3367 	    i1_insn = XEXP (link, 0), i1_val = SET_SRC (set);
11068   rtx link;
11071   for (link = REG_NOTES (insn); link; link = XEXP (link, 1))
11073       if (REG_NOTE_KIND (link) == REG_DEAD
11074 	  && REG_P (XEXP (link, 0)))
11076 	  unsigned int regno = REGNO (XEXP (link, 0));
11079 		       ? hard_regno_nregs[regno][GET_MODE (XEXP (link, 0))]
11085       else if (REG_NOTE_KIND (link) == REG_INC)
11086 	record_value_for_reg (XEXP (link, 0), insn, NULL_RTX);
12336 			 and i3, then we may need to move a link from place to
12508    I3, I2, and I1 to new locations.  This is also called to add a link
12514   rtx link, next_link;
12516   for (link = links; link; link = next_link)
12522       next_link = XEXP (link, 1);
12524       /* If the insn that this link points to is a NOTE or isn't a single
12526 	 can do other than ignore the link, since we can't tell which
12530 	 It is not possible for the destination of the target of the link to
12535       if (NOTE_P (XEXP (link, 0))
12536 	  || (set = single_set (XEXP (link, 0))) == 0)
12546 	 searching at the next insn after the target of the link and stop
12549 	 Note that this correctly handles the link that used to point from
12553       for (insn = NEXT_INSN (XEXP (link, 0));
12572       /* If we found a place to put the link, place it there unless there
12573 	 is already a link to the same insn as LINK at that point.  */
12580 	    if (XEXP (link2, 0) == XEXP (link, 0))
12585 	      XEXP (link, 1) = LOG_LINKS (place);
12586 	      LOG_LINKS (place) = link;
12589 		 link to.  */