Repair some opt that need some digging for constant

theano/tensor/opt.py

@@ -3206,17 +3206,14 @@ def local_incsubtensor_of_zeros(node):
         y = node.inputs[1]
         replace = False
         try:
-            if get_scalar_constant_value(y, only_process_constants=True) == 0:
-                replace = True
-        except NotScalarConstantError:
-            pass
-
-        if replace:
-            # No need to copy over the stacktrace,
-            # because x should already have a stacktrace
-            return [x]
-        else:
-            return False
+            # Don't use only_process_constants=True. We need to
+            # investigate Alloc of 0s but with non constant shape.
+            if get_scalar_constant_value(y, elemwise=False) == 0:
+                # No need to copy over the stacktrace,
+                # because x should already have a stacktrace
+                return [x]
+        except NotScalarConstantError, e:
+            return
 
 
 @register_canonicalize('local_setsubtensor_of_allocs')
@@ -3232,22 +3229,20 @@ def local_setsubtensor_of_constants(node):
     if isinstance(node.op, IncSubtensor) and node.op.set_instead_of_inc:
         x = node.inputs[0]
         y = node.inputs[1]
-        replace_x = None
-        replace_y = None
 
+        # Don't use only_process_constants=True. We need to
+        # investigate Alloc of 0s but with non constant shape.
         try:
-            replace_x = get_scalar_constant_value(x, only_process_constants=True)
+            replace_x = get_scalar_constant_value(x, elemwise=False)
         except NotScalarConstantError:
-            pass
+            return
 
         try:
-            replace_y = get_scalar_constant_value(y, only_process_constants=True)
+            replace_y = get_scalar_constant_value(y, elemwise=False)
         except NotScalarConstantError:
-            pass
+            return
 
-        if (replace_x is not None and
-                replace_y is not None and
-                replace_x == replace_y):
+        if replace_x == replace_y:
 
             # No need to copy over the stacktrace,
             # because x should already have a stacktrace
@@ -3285,7 +3280,9 @@ def local_adv_sub1_adv_inc_sub1(node):
     if idx is not idx2:
         return
     if (not inp.owner.op.set_instead_of_inc and
-            T.extract_constant(x, only_process_constants=True) != 0):
+            # Don't use only_process_constants=True. We need to
+            # investigate Alloc of 0s but with non constant shape.
+            T.extract_constant(x, elemwise=False) != 0):
         return
     cond = [T.all(T.and_(T.lt(idx, x.shape[0]), T.ge(idx, -x.shape[0])))]
     if not node.fgraph.shape_feature.same_shape(idx, y, 0, 0):