cris.md ("reload_out<mode>"): Mark operand 2 as earlyclobber.

	* config/cris/cris.md ("reload_out<mode>"): Mark operand 2 as
	earlyclobber.
	* targhooks.c (default_secondary_reload): Don't require operand 2
	for an input reload to be earlyclobber.

From-SVN: r107517

gcc/ChangeLog

+2005-11-25  Hans-Peter Nilsson  <hp@axis.com>
+
+	* config/cris/cris.md ("reload_out<mode>"): Mark operand 2 as
+	earlyclobber.
+	* targhooks.c (default_secondary_reload): Don't require operand 2
+	for an input reload to be earlyclobber.
+
 2005-11-25  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
 
 	* fold-const.c (negate_mathfn_p): Fix comment and add support

gcc/config/cris/cris.md

@@ -1151,7 +1151,7 @@
   "")
 
 (define_expand "reload_out<mode>"
-  [(set (match_operand:BW 2 "register_operand" "=r")
+  [(set (match_operand:BW 2 "register_operand" "=&r")
 	(match_operand:BW 1 "register_operand" "x"))
    (set (match_operand:BW 0 "memory_operand" "=m")
 	(match_dup 2))]

gcc/targhooks.c

@@ -514,10 +514,15 @@ default_secondary_reload (bool in_p ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
 	    }
 
 	  scratch_constraint = insn_data[(int) icode].operand[2].constraint;
-	  /* The scratch register's constraint must start with "=&".  */
+	  /* The scratch register's constraint must start with "=&",
+	     except for an input reload, where only "=" is necessary,
+	     and where it might be beneficial to re-use registers from
+	     the input.  */
 	  gcc_assert (scratch_constraint[0] == '='
-		      && scratch_constraint[1] == '&');
-	  scratch_constraint += 2;
+		      && (in_p || scratch_constraint[1] == '&'));
+	  scratch_constraint++;
+	  if (*scratch_constraint == '&')
+	    scratch_constraint++;
 	  scratch_letter = *scratch_constraint;
 	  scratch_class
 	    = (scratch_letter == 'r' ? GENERAL_REGS