dist/gcc/compare-elim.c

347   struct comparison *last_cmp = NULL;
361       last_cmp = (struct comparison *) single_pred (bb)->aux;
362       if (last_cmp)
363 	last_cmp_valid = last_cmp->inputs_valid;
383 	  if (last_cmp_valid && can_eliminate_compare (src, eh_note, last_cmp))
391 	  last_cmp = XCNEW (struct comparison);
392 	  last_cmp->insn = insn;
393 	  last_cmp->prev_clobber = last_clobber;
394 	  last_cmp->in_a = strip_not (XEXP (src, 0));
395 	  last_cmp->in_b = XEXP (src, 1);
396 	  last_cmp->not_in_a = is_not (XEXP (src, 0));
397 	  last_cmp->eh_note = eh_note;
398 	  last_cmp->orig_mode = GET_MODE (src);
399 	  if (last_cmp->in_b == const0_rtx
400 	      && last_setter[REGNO (last_cmp->in_a)])
402 	      rtx set = single_set (last_setter[REGNO (last_cmp->in_a)]);
403 	      if (set && rtx_equal_p (SET_DEST (set), last_cmp->in_a))
404 		last_cmp->in_a_setter = last_setter[REGNO (last_cmp->in_a)];
406 	  all_compares.safe_push (last_cmp);
417 	  if (last_cmp)
418 	    find_flags_uses_in_insn (last_cmp, insn);
431 		last_cmp = NULL;
443 	      && (DF_REF_REGNO (def) == REGNO (last_cmp->in_a)
444 		  || (REG_P (last_cmp->in_b)
445 		      && DF_REF_REGNO (def) == REGNO (last_cmp->in_b))))
453   if (last_cmp)
455       bb->aux = last_cmp;
456       last_cmp->inputs_valid = last_cmp_valid;
471 		  last_cmp->missing_uses = true;