Never set reload_override_in for optional reloads.

From-SVN: r37103

gcc/ChangeLog

@@ -3,6 +3,8 @@
 	* reload.c (find_reloads): Distinguish "wins" so that we know whether
 	a given operand won because of a matching constraint or not; then use
 	that information to compute goal_alternative_matched properly.
+	* reload1.c (choose_reload_regs): Never set reload_override_in for an
+	optional reload.
 
 2000-10-28  Neil Booth  <neilb@earthling.net>
 

gcc/reload1.c

@@ -5417,10 +5417,13 @@ choose_reload_regs (chain)
 			      || (rld[r].out && rld[r].reg_rtx
 				  && rtx_equal_p (rld[r].out, rld[r].reg_rtx)))
 			    {
+			      if (! rld[r].optional)
+				{
 				  reload_override_in[r] = last_reg;
 				  reload_inheritance_insn[r]
 				    = reg_reloaded_insn[i];
 				}
+			    }
 			  else
 			    {
 			      int k;
@@ -5518,6 +5521,7 @@ choose_reload_regs (chain)
 		  if (reg_overlap_mentioned_for_reload_p (equiv,
 							  reload_earlyclobbers[i]))
 		    {
+		      if (! rld[r].optional)
 			reload_override_in[r] = equiv;
 		      equiv = 0;
 		      break;
@@ -5541,6 +5545,7 @@ choose_reload_regs (chain)
 		    case RELOAD_OTHER:
 		    case RELOAD_FOR_INPUT:
 		    case RELOAD_FOR_OPERAND_ADDRESS:
+		      if (! rld[r].optional)
 			reload_override_in[r] = equiv;
 		      /* Fall through.  */
 		    default: