do not propagate constants into jump_insn's for machines with CC0, more than once

From-SVN: r37039

gcc/ChangeLog

+2000-10-24  Aldy Hernandez  <aldyh@redhat.com>
+
+        * gcse.c (cprop_insn): do not propagate constants into jump_insn
+        for machines with CC0 more than once.
+
 2000-10-24  Richard Henderson <rth@cygnus.com>, Aldy <aldyh@cygnus.com>
 
         * config/mn10300/mn10300.h (PREFERRED_RELOAD_CLASS): Treat

gcc/gcse.c

@@ -3948,7 +3948,13 @@ cprop_insn (insn, alter_jumps)
 		   && GET_CODE (NEXT_INSN (insn)) == JUMP_INSN
 		   && condjump_p (NEXT_INSN (insn))
 		   && ! simplejump_p (NEXT_INSN (insn)))
-	    changed |= cprop_cc0_jump (insn, reg_used, src);
+            {
+	      if (cprop_cc0_jump (insn, reg_used, src))
+		{
+		  changed = 1;
+		  break;
+		}
+	    }
 #endif
 	}
       else if (GET_CODE (src) == REG