diff --git a/tcg/optimize.c b/tcg/optimize.c
index 220f4601d5..9952c28bdc 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -1484,29 +1484,30 @@ void tcg_optimize(TCGContext *s)
                     }
                 }
             }
-            goto do_reset_output;
+            /* fall through */
 
         default:
         do_default:
-            /* Default case: we know nothing about operation (or were unable
-               to compute the operation result) so no propagation is done.
-               We trash everything if the operation is the end of a basic
-               block, otherwise we only trash the output args.  "mask" is
-               the non-zero bits mask for the first output arg.  */
-            if (def->flags & TCG_OPF_BB_END) {
-                bitmap_zero(temps_used.l, nb_temps);
-            } else {
-        do_reset_output:
-                for (i = 0; i < nb_oargs; i++) {
-                    reset_temp(op->args[i]);
-                    /* Save the corresponding known-zero bits mask for the
-                       first output argument (only one supported so far). */
-                    if (i == 0) {
-                        arg_info(op->args[i])->mask = mask;
-                    }
+            /*
+             * Default case: we know nothing about operation (or were unable
+             * to compute the operation result) so no propagation is done.
+             */
+            for (i = 0; i < nb_oargs; i++) {
+                reset_temp(op->args[i]);
+                /*
+                 * Save the corresponding known-zero bits mask for the
+                 * first output argument (only one supported so far).
+                 */
+                if (i == 0) {
+                    arg_info(op->args[i])->mask = mask;
                 }
             }
             break;
+
+        case INDEX_op_set_label:
+            /* Trash everything at the start of a new extended bb. */
+            bitmap_zero(temps_used.l, nb_temps);
+            break;
         }
 
         /* Eliminate duplicate and redundant fence instructions.  */