contrib/gcc/regmove.c

401 optimize_reg_copy_1 (rtx insn, rtx dest, rtx src)
407   int dregno = REGNO (dest);
428       if (reg_set_p (src, p) || reg_set_p (dest, p)
476 		      && reg_mentioned_p (dest, PATTERN (q)))
481 		  else if (validate_replace_rtx (src, dest, q)
488 		      validate_replace_rtx (dest, src, q);
517 		  if (GET_MODE (XEXP (dest_death, 0)) != GET_MODE (dest))
601 optimize_reg_copy_2 (rtx insn, rtx dest, rtx src)
606   int dregno = REGNO (dest);
618       if (set && SET_SRC (set) == dest && SET_DEST (set) == src
619 	  && find_reg_note (p, REG_DEAD, dest))
628 		if (reg_mentioned_p (dest, PATTERN (q)))
629 		  PATTERN (q) = replace_rtx (PATTERN (q), dest, src);
639 	  remove_note (p, find_reg_note (p, REG_DEAD, dest));
647 	  || find_reg_note (p, REG_DEAD, dest)
659 optimize_reg_copy_3 (rtx insn, rtx dest, rtx src)
663   int dst_no = REGNO (dest);
742 /* If we were not able to update the users of src to use dest directly, try
743    instead moving the value to dest directly before the operation.  */
746 copy_src_to_dest (rtx insn, rtx src, rtx dest, int old_max_uid)
768       && REG_P (dest)
769       && REG_LIVE_LENGTH (REGNO (dest)) > 0
771       && !reg_mentioned_p (dest, SET_SRC (set))
772       && GET_MODE (src) == GET_MODE (dest))
776       /* Generate the src->dest move.  */
778       emit_move_insn (dest, src);
783 	  || ! validate_replace_rtx (src, dest, insn))
829       dest_regno = REGNO (dest);
921    another add immediate instruction with the same source and dest registers,
1148 	     Then scan forward for an instruction which uses the dest
1150 	     If it dies there, then replace the dest in both operands with
1257 	     dest operand in both instructions.  */
1891       /* The lifetime of src and dest overlap,
2340 	  rtx dest = SET_DEST (set);
2344 	  if (dest == stack_pointer_rtx
2430 	      && MEM_P (dest)
2431 	      && ((GET_CODE (XEXP (dest, 0)) == PRE_DEC
2433 		       == (HOST_WIDE_INT) GET_MODE_SIZE (GET_MODE (dest))))
2434 		  || (GET_CODE (XEXP (dest, 0)) == PRE_MODIFY
2435 		      && GET_CODE (XEXP (XEXP (dest, 0), 1)) == PLUS
2436 		      && XEXP (XEXP (XEXP (dest, 0), 1), 0) == stack_pointer_rtx
2437 		      && (GET_CODE (XEXP (XEXP (XEXP (dest, 0), 1), 1))
2439 		      && (INTVAL (XEXP (XEXP (XEXP (dest, 0), 1), 1))
2441 	      && XEXP (XEXP (dest, 0), 0) == stack_pointer_rtx
2443 	      && memory_address_p (GET_MODE (dest), stack_pointer_rtx)
2445 				  replace_equiv_address (dest,