recog.c (constrain_operands): Initialize which_alternative before no alternatives early exit.

        * recog.c (constrain_operands): Initialize which_alternative
        before no alternatives early exit.

From-SVN: r37065

gcc/ChangeLog

 2000-10-25  Richard Henderson  <rth@redhat.com>
 
+	* recog.c (constrain_operands): Initialize which_alternative
+	before no alternatives early exit.
+
 	* cse.c (find_comparison_args): Check that we can reverse a
 	comparison if needed before accepting the substitution.
 
-2000-10-25  Richard Henderson  <rth@redhat.com>
-
 	* reload.c (find_reloads_address_part): Kill rtx obstack hackery.
 
-2000-10-25  Richard Henderson  <rth@redhat.com>
-
 	* simplify-rtx.c (simplify_relational_operation): Sign extend
 	low words before sign extending to high words.
 

gcc/recog.c

@@ -2332,6 +2332,7 @@ constrain_operands (strict)
   struct funny_match funny_match[MAX_RECOG_OPERANDS];
   int funny_match_index;
 
+  which_alternative = 0;
   if (recog_data.n_operands == 0 || recog_data.n_alternatives == 0)
     return 1;
 
@@ -2341,9 +2342,7 @@ constrain_operands (strict)
       matching_operands[c] = -1;
     }
 
-  which_alternative = 0;
-
-  while (which_alternative < recog_data.n_alternatives)
+  do
     {
       register int opno;
       int lose = 0;
@@ -2646,6 +2645,7 @@ constrain_operands (strict)
 
       which_alternative++;
     }
+  while (which_alternative < recog_data.n_alternatives);
 
   which_alternative = -1;
   /* If we are about to reject this, but we are not to test strictly,