From 6f7ba19a8b9ab0a494df9e56661e0aa13e950e23 Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Fri, 11 Nov 2011 04:34:19 -0500
Subject: [PATCH] Many more fixes to subst-precompute.

---
 MEMO                        |   5 +-
 loopy/__init__.py           |   9 +-
 loopy/cse.py                | 151 ++++++++++++++++++++---------
 loopy/isl_helpers.py        |  38 +++++---
 loopy/kernel.py             |  23 ++---
 loopy/subst.py              |   2 +-
 loopy/symbolic.py           |   6 +-
 test/test_advect_dealias.py | 142 ---------------------------
 test/test_fem_assembly.py   |  38 ++++----
 test/test_interp_diff.py    |  87 -----------------
 test/test_linalg.py         |  20 ++--
 test/test_sem.py            | 188 ++++++++++++++++++++++++++++++++++++
 12 files changed, 370 insertions(+), 339 deletions(-)
 delete mode 100644 test/test_advect_dealias.py
 delete mode 100644 test/test_interp_diff.py

diff --git a/MEMO b/MEMO
index cd9014742..d6300e1dc 100644
--- a/MEMO
+++ b/MEMO
@@ -39,7 +39,8 @@ Things to consider
 To-do
 ^^^^^
 
-- CSE should be more like variable assignment
+- What if no universally valid precompute base index expression is found?
+  (test_intel_matrix_mul with n = 6*16, e.g.?)
 
 - Fix all tests
 
@@ -83,6 +84,8 @@ Future ideas
 Dealt with
 ^^^^^^^^^^
 
+- CSE should be more like variable assignment
+
 - Deal with equality constraints.
   (These arise, e.g., when partitioning a loop of length 16 into 16s.)
 
diff --git a/loopy/__init__.py b/loopy/__init__.py
index c899824dc..67b1b2d21 100644
--- a/loopy/__init__.py
+++ b/loopy/__init__.py
@@ -421,14 +421,15 @@ def add_prefetch(kernel, var_name, sweep_dims, dim_args=None,
         new_inames=None, default_tag="l.auto", rule_name=None):
 
     if rule_name is None:
-        rule_name = kernel.make_unique_subst_rule_name("%s_fetch" % var_name)
+        rule_name = kernel.make_unique_var_name("%s_fetch" % var_name)
+
+    newly_created_vars = set([rule_name])
 
     arg = kernel.arg_dict[var_name]
 
-    newly_created_vars = set()
     parameters = []
-    for i in range(len(arg.shape)):
-        based_on = "%s_fetch_%d" % (var_name, i)
+    for i in range(arg.dimensions):
+        based_on = "%s_dim_%d" % (var_name, i)
         if dim_args is not None and i < len(dim_args):
             based_on = dim_args[i]
 
diff --git a/loopy/cse.py b/loopy/cse.py
index 9f184edda..1db1ac2d5 100644
--- a/loopy/cse.py
+++ b/loopy/cse.py
@@ -40,38 +40,69 @@ def get_footprint(kernel, subst_name, old_arg_names, arg_names,
         sweep_inames, invocation_descriptors):
     global_footprint_map = None
 
+    # {{{  find sweep inames referenced by arguments
+
     processed_sweep_inames = set()
 
     for invdesc in invocation_descriptors:
-
         for iname in sweep_inames:
             if iname in old_arg_names:
                 arg_idx = old_arg_names.index(iname)
-                processed_sweep_inames.add(
+                processed_sweep_inames.update(
                         get_dependencies(invdesc.args[arg_idx]))
             else:
                 processed_sweep_inames.add(iname)
 
-        # {{{ construct, check mapping
+    sweep_inames = list(processed_sweep_inames)
+    del processed_sweep_inames
+
+    # }}}
+
+    # {{{ duplicate sweep inames
+
+    primed_sweep_inames = [psin+"'" for psin in sweep_inames]
+    from loopy.isl_helpers import duplicate_axes
+    dup_sweep_index = kernel.space.dim(dim_type.out)
+    domain_dup_sweep = duplicate_axes(
+            kernel.domain, sweep_inames,
+            primed_sweep_inames)
+
+    prime_sweep_inames = SubstitutionMapper(make_subst_func(
+        dict((sin, var(psin)) for sin, psin in zip(sweep_inames, primed_sweep_inames))))
+
+    # }}}
+
+    # {{{ construct arg mapping
 
-        map_space = kernel.space
+    # map goes from substitution arguments to domain_dup_sweep
+
+    for invdesc in invocation_descriptors:
+        map_space = domain_dup_sweep.get_space()
         ln = len(arg_names)
-        rn = kernel.space.dim(dim_type.out)
+        rn = map_space.dim(dim_type.out)
 
         map_space = map_space.add_dims(dim_type.in_, ln)
         for i, iname in enumerate(arg_names):
+            # arg names are initially primed, to be replaced with unprimed
+            # base-0 versions below
+
             map_space = map_space.set_dim_name(dim_type.in_, i, iname+"'")
 
+        # map_space: [arg_names] -> [domain](dup_sweep_index)[dup_sweep]
+
         set_space = map_space.move_dims(
                 dim_type.out, rn,
                 dim_type.in_, 0, ln).range()
 
+        # set_space: <domain>(dup_sweep_index)<dup_sweep><arg_names>
+
         footprint_map = None
 
         from loopy.symbolic import aff_from_expr
         for uarg_name, arg_val in zip(arg_names, invdesc.args):
             cns = isl.Constraint.equality_from_aff(
-                    aff_from_expr(set_space, var(uarg_name+"'") - arg_val))
+                    aff_from_expr(set_space, 
+                        var(uarg_name+"'") - prime_sweep_inames(arg_val)))
 
             cns_map = isl.BasicMap.from_constraint(cns)
             if footprint_map is None:
@@ -83,23 +114,26 @@ def get_footprint(kernel, subst_name, old_arg_names, arg_names,
                 dim_type.in_, 0,
                 dim_type.out, rn, ln)
 
+        # footprint_map is back in map_space
+
         if global_footprint_map is None:
             global_footprint_map = footprint_map
         else:
             global_footprint_map = global_footprint_map.union(footprint_map)
 
-        # }}}
+    # }}}
 
-    processed_sweep_inames = list(processed_sweep_inames)
+    if isinstance(global_footprint_map, isl.BasicMap):
+        global_footprint_map = isl.Map.from_basic_map(global_footprint_map)
+    global_footprint_map = global_footprint_map.intersect_range(domain_dup_sweep)
 
-    global_footprint_map = (isl.Map.from_basic_map(global_footprint_map)
-            .intersect_range(kernel.domain))
+    # {{{ compute bounds indices
 
     # move non-sweep-dimensions into parameter space
-    sweep_footprint_map = global_footprint_map.coalesce()
+    sweep_footprint_map = global_footprint_map
 
     for iname in kernel.all_inames():
-        if iname not in processed_sweep_inames:
+        if iname not in sweep_inames:
             sp = sweep_footprint_map.get_space()
             dt, idx = sp.get_var_dict()[iname]
             sweep_footprint_map = sweep_footprint_map.move_dims(
@@ -107,7 +141,7 @@ def get_footprint(kernel, subst_name, old_arg_names, arg_names,
                     dt, idx, 1)
 
     # compute bounding boxes to each set of parameters
-    sfm_dom = sweep_footprint_map.domain().coalesce()
+    sfm_dom = sweep_footprint_map.domain()
 
     if not sfm_dom.is_bounded():
         raise RuntimeError("In precomputation of substitution '%s': "
@@ -117,8 +151,9 @@ def get_footprint(kernel, subst_name, old_arg_names, arg_names,
     from loopy.kernel import find_var_base_indices_and_shape_from_inames
     arg_base_indices, shape = find_var_base_indices_and_shape_from_inames(
             sfm_dom, [uarg+"'" for uarg in arg_names],
-            kernel.cache_manager)
-    print arg_names, shape
+            kernel.cache_manager, context=kernel.assumptions)
+
+    # }}}
 
     # compute augmented domain
 
@@ -129,7 +164,7 @@ def get_footprint(kernel, subst_name, old_arg_names, arg_names,
     non1_shape = []
 
     for arg_name, bi, l in zip(arg_names, arg_base_indices, shape):
-        if l > 1:
+        if l != 1:
             non1_arg_names.append(arg_name)
             non1_arg_base_indices.append(bi)
             non1_shape.append(l)
@@ -140,26 +175,28 @@ def get_footprint(kernel, subst_name, old_arg_names, arg_names,
     # add the new, base-0 as new in dimensions
 
     sp = global_footprint_map.get_space()
-    tgt_idx = sp.dim(dim_type.out)
+    arg_idx = sp.dim(dim_type.out)
 
     n_args = len(arg_names)
     nn1_args = len(non1_arg_names)
 
     aug_domain = global_footprint_map.move_dims(
-            dim_type.out, tgt_idx,
+            dim_type.out, arg_idx,
             dim_type.in_, 0,
             n_args).range().coalesce()
 
-    aug_domain = aug_domain.insert_dims(dim_type.set, tgt_idx, nn1_args)
+    aug_domain = aug_domain.insert_dims(dim_type.set, arg_idx, nn1_args)
     for i, name in enumerate(non1_arg_names):
-        aug_domain = aug_domain.set_dim_name(dim_type.set, tgt_idx+i, name)
+        aug_domain = aug_domain.set_dim_name(dim_type.set, arg_idx+i, name)
 
     # index layout now:
-    # <....out.....> (tgt_idx) <base-0 non-1-length args> <args>
+    #
+    # <domain> (dup_sweep_index) <dup_sweep> (arg_index) ...
+    # ... <base-0 non-1-length args> <all args>
 
     from loopy.symbolic import aff_from_expr
     for arg_name, bi, s in zip(arg_names, arg_base_indices, shape):
-        if s > 1:
+        if s != 1:
             cns = isl.Constraint.equality_from_aff(
                     aff_from_expr(aug_domain.get_space(),
                         var(arg_name) - (var(arg_name+"'") - bi)))
@@ -170,15 +207,24 @@ def get_footprint(kernel, subst_name, old_arg_names, arg_names,
 
     # eliminate inames with non-zero base indices
 
-    aug_domain = aug_domain.eliminate(dim_type.set, tgt_idx+nn1_args, n_args)
-    aug_domain = aug_domain.remove_dims(dim_type.set, tgt_idx+nn1_args, n_args)
+    aug_domain = aug_domain.eliminate(dim_type.set, arg_idx+nn1_args, n_args)
+    aug_domain = aug_domain.remove_dims(dim_type.set, arg_idx+nn1_args, n_args)
 
     base_indices_2, shape_2 = find_var_base_indices_and_shape_from_inames(
-            aug_domain, non1_arg_names, kernel.cache_manager)
+            aug_domain, non1_arg_names, kernel.cache_manager,
+            context=kernel.assumptions)
 
     assert base_indices_2 == [0] * nn1_args
     assert shape_2 == non1_shape
 
+    # {{{ eliminate duplicated sweep_inames
+
+    nsweep = len(sweep_inames)
+    aug_domain = aug_domain.eliminate(dim_type.set, dup_sweep_index, nsweep)
+    aug_domain = aug_domain.remove_dims(dim_type.set, dup_sweep_index, nsweep)
+
+    # }}}
+
     return (non1_arg_names, aug_domain,
             arg_base_indices, non1_arg_base_indices, non1_shape)
 
@@ -186,9 +232,12 @@ def get_footprint(kernel, subst_name, old_arg_names, arg_names,
 
 
 
-def simplify_via_aff(space, expr):
+def simplify_via_aff(expr):
     from loopy.symbolic import aff_from_expr, aff_to_expr
-    return aff_to_expr(aff_from_expr(space, expr))
+    deps = get_dependencies(expr)
+    return aff_to_expr(aff_from_expr(
+        isl.Space.create_from_names(isl.Context(), list(deps)),
+        expr))
 
 
 
@@ -206,6 +255,10 @@ def precompute(kernel, subst_name, dtype, sweep_inames=[],
     invocation_arg_deps = set()
 
     def gather_substs(expr, name, args, rec):
+        if len(args) != len(subst.arguments):
+            raise RuntimeError("Rule '%s' invoked with %d arguments (needs %d)"
+                    % (subst_name, len(args), len(subst.arguments), ))
+
         arg_deps = get_dependencies(args)
         if not arg_deps <= kernel.all_inames():
             raise RuntimeError("CSE arguments in '%s' do not consist "
@@ -219,11 +272,18 @@ def precompute(kernel, subst_name, dtype, sweep_inames=[],
 
     from loopy.symbolic import SubstitutionCallbackMapper
     scm = SubstitutionCallbackMapper([subst_name], gather_substs)
+
+    from loopy.symbolic import ParametrizedSubstitutor
+    rules_except_mine = kernel.substitutions.copy()
+    del rules_except_mine[subst_name]
+    subst_expander = ParametrizedSubstitutor(rules_except_mine)
+
     for insn in kernel.instructions:
-        scm(insn.expression)
-    for s in kernel.substitutions.itervalues():
-        if s is not subst:
-            scm(s.expression)
+        # We can't deal with invocations that involve other substitution's
+        # arguments. Therefore, fully expand each instruction and look at
+        # the invocations in subst_name occurring there.
+
+        scm(subst_expander(insn.expression))
 
     allowable_sweep_inames = invocation_arg_deps | set(arg_names)
     if not set(sweep_inames) <= allowable_sweep_inames:
@@ -356,19 +416,14 @@ def precompute(kernel, subst_name, dtype, sweep_inames=[],
 
     # }}}
 
-    # {{{ substitute rule into instructions
+    # {{{ substitute rule into expressions in kernel
 
     def do_substs(expr, name, args, rec):
-        found = False
-        for invdesc in invocation_descriptors:
-            if expr is invdesc.expr:
-                found = True
-                break
-
-        if not found:
-            return
+        if len(args) != len(subst.arguments):
+            raise ValueError("invocation of '%s' with too few arguments"
+                    % name)
 
-        args = [simplify_via_aff(new_domain.get_space(), arg-bi)
+        args = [simplify_via_aff(arg-bi)
                 for arg, bi in zip(args, non1_arg_base_indices)]
 
         new_outer_expr = var(target_var_name)
@@ -384,16 +439,16 @@ def precompute(kernel, subst_name, dtype, sweep_inames=[],
     for insn in kernel.instructions:
         new_insns.append(insn.copy(expression=sub_map(insn.expression)))
 
+    new_substs = dict(
+            (s.name, s.copy(expression=sub_map(s.expression)))
+            for s in kernel.substitutions.itervalues()
+            if s.name != subst_name)
+
     # }}}
 
     new_iname_to_tag = kernel.iname_to_tag.copy()
-    if sweep_inames:
-        new_iname_to_tag.update(arg_name_to_tag)
-
-    new_substs = dict(
-            (s.name, s.copy(expression=sub_map(subst.expression)))
-            for s in kernel.substitutions.itervalues())
-    del new_substs[subst_name]
+    for arg_name in non1_arg_names:
+        new_iname_to_tag[arg_name] = arg_name_to_tag[arg_name]
 
     return kernel.copy(
             domain=new_domain,
diff --git a/loopy/isl_helpers.py b/loopy/isl_helpers.py
index 2e68cc1d5..a509b8a30 100644
--- a/loopy/isl_helpers.py
+++ b/loopy/isl_helpers.py
@@ -153,19 +153,30 @@ def iname_rel_aff(space, iname, rel, aff):
 
 
 
-def static_extremum_of_pw_aff(pw_aff, constants_only, set_method, what):
+def static_extremum_of_pw_aff(pw_aff, constants_only, set_method, what, context):
     pieces = pw_aff.get_pieces()
     if len(pieces) == 1:
         return pieces[0][1]
 
-    agg_domain = pw_aff.get_aggregate_domain()
+    reference = pw_aff.get_aggregate_domain()
+
+    if context is not None:
+        context = isl.align_spaces(context, pw_aff.get_domain_space())
+        reference = reference.intersect(context)
 
     for set, candidate_aff in pieces:
-        if constants_only and not candidate_aff.is_cst():
-            continue
+        for use_gist in [False, True]:
+            if use_gist:
+                if context is not None:
+                    candidate_aff = pw_aff.gist(set & context)
+                else:
+                    candidate_aff = pw_aff.gist(set)
+
+            if constants_only and not candidate_aff.is_cst():
+                continue
 
-        if set_method(pw_aff, candidate_aff) == agg_domain:
-            return candidate_aff
+            if reference <= set_method(pw_aff, candidate_aff):
+                return candidate_aff
 
     raise ValueError("a static %s was not found for PwAff '%s'"
             % (what, pw_aff))
@@ -173,22 +184,25 @@ def static_extremum_of_pw_aff(pw_aff, constants_only, set_method, what):
 
 
 
-def static_min_of_pw_aff(pw_aff, constants_only):
+def static_min_of_pw_aff(pw_aff, constants_only, context=None):
     return static_extremum_of_pw_aff(pw_aff, constants_only, isl.PwAff.ge_set,
-            "minimum")
+            "minimum", context)
 
-def static_max_of_pw_aff(pw_aff, constants_only):
+def static_max_of_pw_aff(pw_aff, constants_only, context=None):
     return static_extremum_of_pw_aff(pw_aff, constants_only, isl.PwAff.le_set,
-            "maximum")
+            "maximum", context)
 
-def static_value_of_pw_aff(pw_aff, constants_only):
+def static_value_of_pw_aff(pw_aff, constants_only, context=None):
     return static_extremum_of_pw_aff(pw_aff, constants_only, isl.PwAff.eq_set,
-            "value")
+            "value", context)
 
 
 
 
 def duplicate_axes(isl_obj, duplicate_inames, new_inames):
+    if not duplicate_inames:
+        return isl_obj
+
     # {{{ add dims
 
     start_idx = isl_obj.dim(dim_type.set)
diff --git a/loopy/kernel.py b/loopy/kernel.py
index bcd09f820..1c5651a0c 100644
--- a/loopy/kernel.py
+++ b/loopy/kernel.py
@@ -153,6 +153,10 @@ class ArrayArg:
 
         self.constant_mem = constant_mem
 
+    @property
+    def dimensions(self):
+        return len(self.shape)
+
     def __repr__(self):
         return "<ArrayArg '%s' of type %s>" % (self.name, self.dtype)
 
@@ -516,11 +520,11 @@ class LoopKernel(Record):
                     "(?:\|(?P<duplicate_inames_and_tags>[\s\w,:.]*))?"
                 "\])?"
                 "\s*(?:\<(?P<temp_var_type>.+)\>)?"
-                "\s*(?P<lhs>.+)\s*=\s*(?P<rhs>.+?)"
+                "\s*(?P<lhs>.+)\s*(?<!\:)=\s*(?P<rhs>.+?)"
                 "\s*?(?:\:\s*(?P<insn_deps>[\s\w,]+))?$"
                 )
         SUBST_RE = re.compile(
-                r"^\s*(?P<lhs>.+)\s*:=\s*(?P<rhs>.+?)\s*$"
+                r"^\s*(?P<lhs>.+)\s*:=\s*(?P<rhs>.+)\s*$"
                 )
 
         def parse_iname_and_tag_list(s):
@@ -692,12 +696,6 @@ class LoopKernel(Record):
             if id_str not in used_ids:
                 return id_str
 
-    def make_unique_subst_rule_name(self, based_on="subst"):
-        from loopy.tools import generate_unique_possibilities
-        for id_str in generate_unique_possibilities(based_on):
-            if id_str not in self.substitutions:
-                return id_str
-
     @memoize_method
     def all_inames(self):
         from islpy import dim_type
@@ -1103,7 +1101,8 @@ class LoopKernel(Record):
 
 
 
-def find_var_base_indices_and_shape_from_inames(domain, inames, cache_manager):
+def find_var_base_indices_and_shape_from_inames(
+        domain, inames, cache_manager, context=None):
     base_indices = []
     shape = []
 
@@ -1116,9 +1115,11 @@ def find_var_base_indices_and_shape_from_inames(domain, inames, cache_manager):
         from loopy.symbolic import pw_aff_to_expr
 
         shape.append(pw_aff_to_expr(static_max_of_pw_aff(
-                upper_bound_pw_aff - lower_bound_pw_aff + 1, constants_only=True)))
+                upper_bound_pw_aff - lower_bound_pw_aff + 1, constants_only=True,
+                context=context)))
         base_indices.append(pw_aff_to_expr(
-            static_value_of_pw_aff(lower_bound_pw_aff, constants_only=False)))
+            static_value_of_pw_aff(lower_bound_pw_aff, constants_only=False,
+                context=context)))
 
     return base_indices, shape
 
diff --git a/loopy/subst.py b/loopy/subst.py
index 1d44ed29d..c89bc5869 100644
--- a/loopy/subst.py
+++ b/loopy/subst.py
@@ -165,7 +165,7 @@ def extract_subst(kernel, subst_name, template, parameters):
 
     for subst in kernel.substitutions.itervalues():
         new_substs[subst.name] = subst.copy(
-                expression=cbmapper(insn.expression))
+                expression=cbmapper(subst.expression))
 
     # }}}
 
diff --git a/loopy/symbolic.py b/loopy/symbolic.py
index 7804c1cdc..e1be27965 100644
--- a/loopy/symbolic.py
+++ b/loopy/symbolic.py
@@ -601,11 +601,11 @@ class ParametrizedSubstitutor(IdentityMapper):
                 or expr.function.name not in self.rules):
             return IdentityMapper.map_variable(self, expr)
 
-        cse_name = expr.function.name
-        rule = self.rules[cse_name]
+        rule_name = expr.function.name
+        rule = self.rules[rule_name]
         if len(rule.arguments) != len(expr.parameters):
             raise RuntimeError("Rule '%s' invoked with %d arguments (needs %d)"
-                    % (cse_name, len(expr.parameters), len(rule.arguments), ))
+                    % (rule_name, len(expr.parameters), len(rule.arguments), ))
 
         from pymbolic.mapper.substitutor import make_subst_func
         subst_map = SubstitutionMapper(make_subst_func(
diff --git a/test/test_advect_dealias.py b/test/test_advect_dealias.py
deleted file mode 100644
index cd0df0da7..000000000
--- a/test/test_advect_dealias.py
+++ /dev/null
@@ -1,142 +0,0 @@
-
-def test_advect(ctx_factory):
-
-    dtype = np.float32
-    ctx = ctx_factory()
-    order = "C"
-    queue = cl.CommandQueue(ctx,
-            properties=cl.command_queue_properties.PROFILING_ENABLE)
-
-    N = 8
-    M = 8
-
-    from pymbolic import var
-    K_sym = var("K")
-
-    field_shape = (N, N, N, K_sym)
-    interim_field_shape = (M, M, M, K_sym)
-
-    # 1. direction-by-direction similarity transform on u
-    # 2. invert diagonal 
-    # 3. transform back (direction-by-direction)
-
-    # K - run-time symbolic
-    knl = lp.make_kernel(ctx.devices[0],
-            "[K] -> {[i,ip,j,jp,k,kp,m,e]: 0<=i,j,k,m<%d AND 0<=o,ip,jp,kp<%d 0<=e<K}" %M %N
-            [
-
-                # interpolate u to integration nodes
-                "CSE:  u0[i,jp,kp,e] = sum_float32(@o, I[i,o]*u[o,jp,kp,e])",
-                "CSE:  u1[i,j,kp,e]  = sum_float32(@o, I[j,o]*u0[i,o,kp,e])",
-                "CSE:  Iu[i,j,k,e]   = sum_float32(@o, I[k,o]*u1[i,j,o,e])",
-
-                # differentiate u on integration nodes
-                "CSE:  Iur[i,j,k,e]  = sum_float32(@m, D[i,m]*Iu[m,j,k,e])",
-                "CSE:  Ius[i,j,k,e]  = sum_float32(@m, D[j,m]*Iu[i,m,k,e])",
-                "CSE:  Iut[i,j,k,e]  = sum_float32(@m, D[k,m]*Iu[i,j,m,e])",
-
-                # interpolate v to integration nodes
-                "CSE:  v0[i,jp,kp,e] = sum_float32(@o, I[i,o]*v[o,jp,kp,e])",
-                "CSE:  v1[i,j,kp,e]  = sum_float32(@o, I[j,o]*v0[i,o,kp,e])",
-                "CSE:  Iv[i,j,k,e]   = sum_float32(@o, I[k,o]*v1[i,j,o,e])",
-
-                # differentiate v on integration nodes
-                "CSE:  Ivr[i,j,k,e]  = sum_float32(@m, D[i,m]*Iv[m,j,k,e])",
-                "CSE:  Ivs[i,j,k,e]  = sum_float32(@m, D[j,m]*Iv[i,m,k,e])",
-                "CSE:  Ivt[i,j,k,e]  = sum_float32(@m, D[k,m]*Iv[i,j,m,e])",
-
-                # interpolate w to integration nodes
-                "CSE:  w0[i,jp,kp,e] = sum_float32(@o, I[i,o]*w[o,jp,kp,e])",
-                "CSE:  w1[i,j,kp,e]  = sum_float32(@o, I[j,o]*w0[i,o,kp,e])",
-                "CSE:  Iw[i,j,k,e]   = sum_float32(@o, I[k,o]*w1[i,j,o,e])",
-
-                # differentiate v on integration nodes
-                "CSE:  Iwr[i,j,k,e]  = sum_float32(@m, D[i,m]*Iw[m,j,k,e])",
-                "CSE:  Iws[i,j,k,e]  = sum_float32(@m, D[j,m]*Iw[i,m,k,e])",
-                "CSE:  Iwt[i,j,k,e]  = sum_float32(@m, D[k,m]*Iw[i,j,m,e])",
-
-                # find velocity in (r,s,t) coordinates
-                # QUESTION: should I use CSE here ?
-                "CSE: Vr[i,j,k,e] = G[i,j,k,0,e]*Iu[i,j,k,e] + G[i,j,k,1,e]*Iv[i,j,k,e] + G[i,j,k,2,e]*Iw[i,j,k,e]",
-                "CSE: Vs[i,j,k,e] = G[i,j,k,3,e]*Iu[i,j,k,e] + G[i,j,k,4,e]*Iv[i,j,k,e] + G[i,j,k,5,e]*Iw[i,j,k,e]",
-                "CSE: Vt[i,j,k,e] = G[i,j,k,6,e]*Iu[i,j,k,e] + G[i,j,k,7,e]*Iv[i,j,k,e] + G[i,j,k,8,e]*Iw[i,j,k,e]",
-
-                # form nonlinear term on integration nodes
-                # QUESTION: should I use CSE here ?
-                "<SE: Nu[i,j,k,e] = Vr[i,j,k,e]*Iur[i,j,k,e]+Vs[i,j,k,e]*Ius[i,j,k,e]+Vt[i,j,k,e]*Iut[i,j,k,e]",
-                "<SE: Nv[i,j,k,e] = Vr[i,j,k,e]*Ivr[i,j,k,e]+Vs[i,j,k,e]*Ivs[i,j,k,e]+Vt[i,j,k,e]*Ivt[i,j,k,e]",
-                "<SE: Nw[i,j,k,e] = Vr[i,j,k,e]*Iwr[i,j,k,e]+Vs[i,j,k,e]*Iws[i,j,k,e]+Vt[i,j,k,e]*Iwt[i,j,k,e]",
-
-                # L2 project Nu back to Lagrange basis
-                "CSE: Nu2[ip,j,k,e]   = sum_float32(@m, V[ip,m]*Nu[m,j,k,e])",
-                "CSE: Nu1[ip,jp,k,e]  = sum_float32(@m, V[jp,m]*Nu2[ip,m,k,e])",
-                "INu[ip,jp,kp,e] = sum_float32(@m, V[kp,m]*Nu1[ip,jp,m,e])",
-
-                # L2 project Nv back to Lagrange basis
-                "CSE: Nv2[ip,j,k,e]   = sum_float32(@m, V[ip,m]*Nv[m,j,k,e])",
-                "CSE: Nv1[ip,jp,k,e]  = sum_float32(@m, V[jp,m]*Nv2[ip,m,k,e])",
-                "INv[ip,jp,kp,e] = sum_float32(@m, V[kp,m]*Nv1[ip,jp,m,e])",
-
-                # L2 project Nw back to Lagrange basis
-                "CSE: Nw2[ip,j,k,e]   = sum_float32(@m, V[ip,m]*Nw[m,j,k,e])",
-                "CSE: Nw1[ip,jp,k,e]  = sum_float32(@m, V[jp,m]*Nw2[ip,m,k,e])",
-                "INw[ip,jp,kp,e] = sum_float32(@m, V[kp,m]*Nw1[ip,jp,m,e])",
-
-                ],
-            [
-            lp.ArrayArg("u",   dtype, shape=field_shape, order=order),
-            lp.ArrayArg("v",   dtype, shape=field_shape, order=order),
-            lp.ArrayArg("w",   dtype, shape=field_shape, order=order),
-            lp.ArrayArg("INu",   dtype, shape=field_shape, order=order),
-            lp.ArrayArg("INv",   dtype, shape=field_shape, order=order),
-            lp.ArrayArg("INw",   dtype, shape=field_shape, order=order),
-            lp.ArrayArg("D",   dtype, shape=(M,M),  order=order),
-            lp.ArrayArg("I",   dtype, shape=(M, N), order=order),
-            lp.ArrayArg("V",   dtype, shape=(N, M), order=order),
-            lp.ScalarArg("K",  np.int32, approximately=1000),
-            ],
-            name="sem_advect", assumptions="K>=1")
-
-    print knl
-    1/0
-
-    knl = lp.split_dimension(knl, "e", 16, outer_tag="g.0")#, slabs=(0, 1))
-
-    knl = lp.tag_dimensions(knl, dict(i="l.0", j="l.1"))
-
-    print knl
-    #1/0
-
-    kernel_gen = lp.generate_loop_schedules(knl)
-    kernel_gen = lp.check_kernels(kernel_gen, dict(K=1000), kill_level_min=5)
-
-    a = make_well_conditioned_dev_matrix(queue, n, dtype=dtype, order=order)
-    b = make_well_conditioned_dev_matrix(queue, n, dtype=dtype, order=order)
-    c = cl_array.empty_like(a)
-    refsol = np.dot(a.get(), b.get())
-
-    def launcher(kernel, gsize, lsize, check):
-        evt = kernel(queue, gsize(), lsize(), a.data, b.data, c.data,
-                g_times_l=True)
-
-        if check:
-            check_error(refsol, c.get())
-
-        return evt
-
-    lp.drive_timing_run(kernel_gen, queue, launcher, 2*n**3)
-
-
-
-
-if __name__ == "__main__":
-    # make sure that import failures get reported, instead of skipping the
-    # tests.
-    import pyopencl as cl
-
-    import sys
-    if len(sys.argv) > 1:
-        exec(sys.argv[1])
-    else:
-        from py.test.cmdline import main
-        main([__file__])
diff --git a/test/test_fem_assembly.py b/test/test_fem_assembly.py
index 7e57d1508..4502fd13b 100644
--- a/test/test_fem_assembly.py
+++ b/test/test_fem_assembly.py
@@ -31,58 +31,60 @@ def test_laplacian_stiffness(ctx_factory):
     Nc_sym = var("Nc")
 
     knl = lp.make_kernel(ctx.devices[0],
-            "[Nc] -> {[K,i,j,q]: 0<=K<Nc and 0<=i,j<%(Nb)d and 0<=q<%(Nq)d}" 
-            % dict(Nb=Nb, Nq=Nq),
+            "[Nc] -> {[K,i,j,q, ax_a, ax_b, ax_c]: 0<=K<Nc and 0<=i,j<%(Nb)d and 0<=q<%(Nq)d "
+            "and 0<= ax_a, ax_b, ax_c < %(dim)d}" 
+            % dict(Nb=Nb, Nq=Nq, dim=dim),
             [
-                "CSE: dPsi(a,dxi) = jacInv[K,q,0,dxi] * DPsi[a,q,0] "
-                    "+ jacInv[K,q,1,dxi] * DPsi[a,q,1]",
+                "dPsi(a, dxi) := sum_float32(ax_c,"
+                    "  jacInv[ax_c,dxi,K,q] * DPsi[ax_c,a,q])",
                 "A[K, i, j] = sum_float32(q, w[q] * jacDet[K,q] * ("
                     "dPsi(0,0)*dPsi(1,0) + dPsi(0,1)*dPsi(1,1)))"
 
                 ],
             [
-            lp.ArrayArg("jacInv", dtype, shape=(Nc_sym, Nq, dim, dim), order=order),
-            lp.ConstantArrayArg("DPsi", dtype, shape=(Nb, Nq, dim), order=order),
+            lp.ArrayArg("jacInv", dtype, shape=(dim, dim, Nc_sym, Nq), order=order),
+            lp.ConstantArrayArg("DPsi", dtype, shape=(dim, Nb, Nq), order=order),
             lp.ArrayArg("jacDet", dtype, shape=(Nc_sym, Nq), order=order),
             lp.ConstantArrayArg("w", dtype, shape=(Nq, dim), order=order),
             lp.ArrayArg("A", dtype, shape=(Nc_sym, Nb, Nb), order=order),
             lp.ScalarArg("Nc",  np.int32, approximately=1000),
             ],
-            name="semlap", assumptions="Nc>=1")
+            name="lapquad", assumptions="Nc>=1")
 
+    #knl = lp.tag_dimensions(knl, dict(ax_c="unr"))
     seq_knl = knl
 
     def variant_1(knl):
         # no ILP across elements
-        knl= lp.remove_cse_by_tag(knl, "dPsi")
         knl = lp.split_dimension(knl, "K", 16, outer_tag="g.0", slabs=(0,1))
         knl = lp.tag_dimensions(knl, {"i": "l.0", "j": "l.1"})
-        knl = lp.add_prefetch(knl, 'jacInv', ["Kii", "Kio", "q", "x", "y"],
-                uni_template="jacInv[Kii +16*Ko,q,x,y]")
+        knl = lp.add_prefetch(knl, 'jacInv', 
+                ["jacInv_dim_0", "jacInv_dim_1", "K_inner", "q"])
         return knl
 
     def variant_2(knl):
         # with ILP across elements
-        knl= lp.remove_cse_by_tag(knl, "dPsi")
         knl = lp.split_dimension(knl, "K", 16, outer_tag="g.0", slabs=(0,1))
         knl = lp.split_dimension(knl, "K_inner", 4, inner_tag="ilp")
         knl = lp.tag_dimensions(knl, {"i": "l.0", "j": "l.1"})
-        knl = lp.add_prefetch(knl, 'jacInv', ["Kii", "Kio", "q", "x", "y"],
-                uni_template="jacInv[Kii + 4*Kio +16*Ko,q,x,y]")
+        knl = lp.add_prefetch(knl, "jacInv", 
+                ["jacInv_dim_0", "jacInv_dim_1", "K_inner_inner", "K_inner_outer", "q"])
         return knl
 
-    def variant_1(knl):
+    def variant_3(knl):
         # no ILP across elements, precompute dPsiTransf
-        knl= lp.realize_cse(knl, "dPsi", ["a", "dxi", ""])
         knl = lp.split_dimension(knl, "K", 16, outer_tag="g.0", slabs=(0,1))
         knl = lp.tag_dimensions(knl, {"i": "l.0", "j": "l.1"})
-        knl = lp.add_prefetch(knl, 'jacInv', ["Kii", "Kio", "q", "x", "y"],
-                uni_template="jacInv[Kii +16*Ko,q,x,y]")
+        knl = lp.precompute(knl, "dPsi",
+                ["a", "dxi"])
+        knl = lp.add_prefetch(knl, "jacInv", 
+                ["jacInv_dim_0", "jacInv_dim_1", "K_inner", "q"])
         return knl
 
     for variant in [variant_1, variant_2]:
+    #for variant in [variant_3]:
         kernel_gen = lp.generate_loop_schedules(variant(knl),
-                loop_priority=["K", "i", "j"])
+                loop_priority=["jacInv_dim_0", "jacInv_dim_1"])
         kernel_gen = lp.check_kernels(kernel_gen, dict(Nc=Nc))
 
         lp.auto_test_vs_seq(seq_knl, ctx, kernel_gen,
diff --git a/test/test_interp_diff.py b/test/test_interp_diff.py
deleted file mode 100644
index eeed86646..000000000
--- a/test/test_interp_diff.py
+++ /dev/null
@@ -1,87 +0,0 @@
-
-def test_interp_diff(ctx_factory):
-
-    dtype = np.float32
-    ctx = ctx_factory()
-    order = "C"
-    queue = cl.CommandQueue(ctx,
-            properties=cl.command_queue_properties.PROFILING_ENABLE)
-
-    N = 8
-    M = 8
-
-    from pymbolic import var
-    K_sym = var("K")
-
-    field_shape = (N, N, N, K_sym)
-    interim_field_shape = (M, M, M, K_sym)
-
-    # 1. direction-by-direction similarity transform on u
-    # 2. invert diagonal 
-    # 3. transform back (direction-by-direction)
-
-    # K - run-time symbolic
-    knl = lp.make_kernel(ctx.devices[0],
-            "[K] -> {[i,ip,j,jp,k,kp,e]: 0<=i,j,k<%d AND 0<=ip,jp,kp<%d 0<=e<K}" %M %N
-            [
-                "[|i,jp,kp] <float32>  u1[i ,jp,kp,e] = sum_float32(ip, I[i,ip]*u [ip,jp,kp,e])",
-                "[|i,j ,kp] <float32>  u2[i ,j ,kp,e] = sum_float32(jp, I[j,jp]*u1[i ,jp,kp,e])",
-                "[|i,j ,k ] <float32>  u3[i ,j ,k ,e] = sum_float32(kp, I[k,kp]*u2[i ,j ,kp,e])",
-                "[|i,j ,k ] <float32>  Pu[i ,j ,k ,e] = P[i,j,k,e]*u3[i,j,k,e]",
-                "[|i,j ,kp] <float32> Pu3[i ,j ,kp,e] = sum_float32(k, V[kp,k]*Pu[i ,j , k,e])",
-                "[|i,jp,kp] <float32> Pu2[i ,jp,kp,e] = sum_float32(j, V[jp,j]*Pu[i ,j ,kp,e])",
-                "Pu[ip,jp,kp,e] = sum_float32(i, V[ip,i]*Pu[i ,jp,kp,e])",
-                ],
-            [
-            lp.ArrayArg("u",   dtype, shape=field_shape, order=order),
-            lp.ArrayArg("P",   dtype, shape=interim_field_shape, order=order),
-            lp.ArrayArg("I",   dtype, shape=(M, N), order=order),
-            lp.ArrayArg("V",   dtype, shape=(N, M), order=order),
-            lp.ArrayArg("Pu",  dtype, shape=field_shape, order=order),
-            lp.ScalarArg("K",  np.int32, approximately=1000),
-            ],
-            name="sem_lap_precon", assumptions="K>=1")
-
-    print knl
-    1/0
-
-    knl = lp.split_dimension(knl, "e", 16, outer_tag="g.0")#, slabs=(0, 1))
-
-    knl = lp.tag_dimensions(knl, dict(i="l.0", j="l.1"))
-
-    print knl
-    #1/0
-
-    kernel_gen = lp.generate_loop_schedules(knl)
-    kernel_gen = lp.check_kernels(kernel_gen, dict(K=1000), kill_level_min=5)
-
-    a = make_well_conditioned_dev_matrix(queue, n, dtype=dtype, order=order)
-    b = make_well_conditioned_dev_matrix(queue, n, dtype=dtype, order=order)
-    c = cl_array.empty_like(a)
-    refsol = np.dot(a.get(), b.get())
-
-    def launcher(kernel, gsize, lsize, check):
-        evt = kernel(queue, gsize(), lsize(), a.data, b.data, c.data,
-                g_times_l=True)
-
-        if check:
-            check_error(refsol, c.get())
-
-        return evt
-
-    lp.drive_timing_run(kernel_gen, queue, launcher, 2*n**3)
-
-
-
-
-if __name__ == "__main__":
-    # make sure that import failures get reported, instead of skipping the
-    # tests.
-    import pyopencl as cl
-
-    import sys
-    if len(sys.argv) > 1:
-        exec(sys.argv[1])
-    else:
-        from py.test.cmdline import main
-        main([__file__])
diff --git a/test/test_linalg.py b/test/test_linalg.py
index 55f21cf24..48040d2aa 100644
--- a/test/test_linalg.py
+++ b/test/test_linalg.py
@@ -222,8 +222,6 @@ def test_plain_matrix_mul(ctx_factory):
     knl = lp.add_prefetch(knl, "a", ["k_inner", "i_inner"])
     knl = lp.add_prefetch(knl, "b", ["j_inner", "k_inner", ])
 
-    print lp.preprocess_kernel(knl)
-
     kernel_gen = lp.generate_loop_schedules(knl)
     kernel_gen = lp.check_kernels(kernel_gen, {})
 
@@ -259,7 +257,7 @@ def test_variable_size_matrix_mul(ctx_factory):
     knl = lp.make_kernel(ctx.devices[0],
             "[n] -> {[i,j,k]: 0<=i,j,k<n}",
             [
-                "label: c[i, j] = sum_float32(k, cse(a[i, k], lhsmat)*cse(b[k, j], rhsmat))"
+                "label: c[i, j] = sum_float32(k, a[i, k]*b[k, j])"
                 ],
             [
                 lp.ArrayArg("a", dtype, shape=(n, n), order=order),
@@ -275,8 +273,8 @@ def test_variable_size_matrix_mul(ctx_factory):
             outer_tag="g.1", inner_tag="l.0")
     knl = lp.split_dimension(knl, "k", 32)
 
-    knl = lp.realize_cse(knl, "lhsmat", dtype, ["k_inner", "i_inner"])
-    knl = lp.realize_cse(knl, "rhsmat", dtype, ["j_inner", "k_inner"])
+    knl = lp.add_prefetch(knl, "a", ["k_inner", "i_inner"])
+    knl = lp.add_prefetch(knl, "b", ["j_inner", "k_inner"])
 
     kernel_gen = lp.generate_loop_schedules(knl)
     kernel_gen = lp.check_kernels(kernel_gen, dict(n=n))
@@ -362,9 +360,9 @@ def test_rank_one(ctx_factory):
         knl = lp.split_dimension(knl, "j_inner", 16,
                 inner_tag="l.1")
 
-        knl = lp.split_dimension(knl, "a_fetch_0", 16,
+        knl = lp.split_dimension(knl, "a_dim_0", 16,
                 outer_tag="l.1", inner_tag="l.0")
-        knl = lp.split_dimension(knl, "b_fetch_0", 16,
+        knl = lp.split_dimension(knl, "b_dim_0", 16,
                 outer_tag="l.1", inner_tag="l.0")
         return knl
 
@@ -443,7 +441,7 @@ def test_intel_matrix_mul(ctx_factory):
     queue = cl.CommandQueue(ctx,
             properties=cl.command_queue_properties.PROFILING_ENABLE)
 
-    n = 6*16
+    n = 128+32
 
     knl = lp.make_kernel(ctx.devices[0],
             "{[i,j,k]: 0<=i,j,k<%d}" % n,
@@ -640,11 +638,9 @@ def test_image_matrix_mul_ilp(ctx_factory):
     knl = lp.split_dimension(knl, "j", ilp*j_inner_split, outer_tag="g.1")
     knl = lp.split_dimension(knl, "j_inner", j_inner_split, outer_tag="ilp", inner_tag="l.0")
     knl = lp.split_dimension(knl, "k", 2)
-    # conflict-free
+    # conflict-free?
     knl = lp.add_prefetch(knl, 'a', ["i_inner", "k_inner"])
-    knl = lp.add_prefetch(knl, 'b', ["j_inner_outer", "j_inner_inner", "k_inner"],
-            new_inames=["b_j_io", "b_j_ii", "b_k_i"])
-    knl = lp.join_dimensions(knl, ["b_j_io", "b_j_ii"])
+    knl = lp.add_prefetch(knl, 'b', ["j_inner_outer", "j_inner_inner", "k_inner"])
 
     kernel_gen = lp.generate_loop_schedules(knl)
     kernel_gen = lp.check_kernels(kernel_gen, dict(n=n))
diff --git a/test/test_sem.py b/test/test_sem.py
index a5970e24b..d42e030ec 100644
--- a/test/test_sem.py
+++ b/test/test_sem.py
@@ -11,6 +11,8 @@ from pyopencl.tools import pytest_generate_tests_for_pyopencl \
 
 
 def test_laplacian(ctx_factory):
+    1/0 # not adapted to new language
+
     dtype = np.float32
     ctx = ctx_factory()
     order = "C"
@@ -109,6 +111,8 @@ def test_laplacian(ctx_factory):
 
 
 def test_laplacian_lmem(ctx_factory):
+    1/0 # not adapted to new language
+
     dtype = np.float32
     ctx = ctx_factory()
     order = "C"
@@ -181,6 +185,8 @@ def test_laplacian_lmem(ctx_factory):
 
 
 def test_advect(ctx_factory):
+    1/0 # not ready
+
     dtype = np.float32
     ctx = ctx_factory()
 
@@ -272,6 +278,188 @@ def test_advect(ctx_factory):
 
 
 
+def test_advect_dealias(ctx_factory):
+    1/0 # not ready
+
+    dtype = np.float32
+    ctx = ctx_factory()
+    order = "C"
+
+    N = 8
+    M = 8
+
+    from pymbolic import var
+    K_sym = var("K")
+
+    field_shape = (N, N, N, K_sym)
+    interim_field_shape = (M, M, M, K_sym)
+
+    # 1. direction-by-direction similarity transform on u
+    # 2. invert diagonal 
+    # 3. transform back (direction-by-direction)
+
+    # K - run-time symbolic
+    knl = lp.make_kernel(ctx.devices[0],
+            "[K] -> {[i,ip,j,jp,k,kp,m,e]: 0<=i,j,k,m<%d AND 0<=o,ip,jp,kp<%d 0<=e<K}" %M %N
+            [
+
+                # interpolate u to integration nodes
+                "CSE:  u0[i,jp,kp,e] = sum_float32(@o, I[i,o]*u[o,jp,kp,e])",
+                "CSE:  u1[i,j,kp,e]  = sum_float32(@o, I[j,o]*u0[i,o,kp,e])",
+                "CSE:  Iu[i,j,k,e]   = sum_float32(@o, I[k,o]*u1[i,j,o,e])",
+
+                # differentiate u on integration nodes
+                "CSE:  Iur[i,j,k,e]  = sum_float32(@m, D[i,m]*Iu[m,j,k,e])",
+                "CSE:  Ius[i,j,k,e]  = sum_float32(@m, D[j,m]*Iu[i,m,k,e])",
+                "CSE:  Iut[i,j,k,e]  = sum_float32(@m, D[k,m]*Iu[i,j,m,e])",
+
+                # interpolate v to integration nodes
+                "CSE:  v0[i,jp,kp,e] = sum_float32(@o, I[i,o]*v[o,jp,kp,e])",
+                "CSE:  v1[i,j,kp,e]  = sum_float32(@o, I[j,o]*v0[i,o,kp,e])",
+                "CSE:  Iv[i,j,k,e]   = sum_float32(@o, I[k,o]*v1[i,j,o,e])",
+
+                # differentiate v on integration nodes
+                "CSE:  Ivr[i,j,k,e]  = sum_float32(@m, D[i,m]*Iv[m,j,k,e])",
+                "CSE:  Ivs[i,j,k,e]  = sum_float32(@m, D[j,m]*Iv[i,m,k,e])",
+                "CSE:  Ivt[i,j,k,e]  = sum_float32(@m, D[k,m]*Iv[i,j,m,e])",
+
+                # interpolate w to integration nodes
+                "CSE:  w0[i,jp,kp,e] = sum_float32(@o, I[i,o]*w[o,jp,kp,e])",
+                "CSE:  w1[i,j,kp,e]  = sum_float32(@o, I[j,o]*w0[i,o,kp,e])",
+                "CSE:  Iw[i,j,k,e]   = sum_float32(@o, I[k,o]*w1[i,j,o,e])",
+
+                # differentiate v on integration nodes
+                "CSE:  Iwr[i,j,k,e]  = sum_float32(@m, D[i,m]*Iw[m,j,k,e])",
+                "CSE:  Iws[i,j,k,e]  = sum_float32(@m, D[j,m]*Iw[i,m,k,e])",
+                "CSE:  Iwt[i,j,k,e]  = sum_float32(@m, D[k,m]*Iw[i,j,m,e])",
+
+                # find velocity in (r,s,t) coordinates
+                # QUESTION: should I use CSE here ?
+                "CSE: Vr[i,j,k,e] = G[i,j,k,0,e]*Iu[i,j,k,e] + G[i,j,k,1,e]*Iv[i,j,k,e] + G[i,j,k,2,e]*Iw[i,j,k,e]",
+                "CSE: Vs[i,j,k,e] = G[i,j,k,3,e]*Iu[i,j,k,e] + G[i,j,k,4,e]*Iv[i,j,k,e] + G[i,j,k,5,e]*Iw[i,j,k,e]",
+                "CSE: Vt[i,j,k,e] = G[i,j,k,6,e]*Iu[i,j,k,e] + G[i,j,k,7,e]*Iv[i,j,k,e] + G[i,j,k,8,e]*Iw[i,j,k,e]",
+
+                # form nonlinear term on integration nodes
+                # QUESTION: should I use CSE here ?
+                "<SE: Nu[i,j,k,e] = Vr[i,j,k,e]*Iur[i,j,k,e]+Vs[i,j,k,e]*Ius[i,j,k,e]+Vt[i,j,k,e]*Iut[i,j,k,e]",
+                "<SE: Nv[i,j,k,e] = Vr[i,j,k,e]*Ivr[i,j,k,e]+Vs[i,j,k,e]*Ivs[i,j,k,e]+Vt[i,j,k,e]*Ivt[i,j,k,e]",
+                "<SE: Nw[i,j,k,e] = Vr[i,j,k,e]*Iwr[i,j,k,e]+Vs[i,j,k,e]*Iws[i,j,k,e]+Vt[i,j,k,e]*Iwt[i,j,k,e]",
+
+                # L2 project Nu back to Lagrange basis
+                "CSE: Nu2[ip,j,k,e]   = sum_float32(@m, V[ip,m]*Nu[m,j,k,e])",
+                "CSE: Nu1[ip,jp,k,e]  = sum_float32(@m, V[jp,m]*Nu2[ip,m,k,e])",
+                "INu[ip,jp,kp,e] = sum_float32(@m, V[kp,m]*Nu1[ip,jp,m,e])",
+
+                # L2 project Nv back to Lagrange basis
+                "CSE: Nv2[ip,j,k,e]   = sum_float32(@m, V[ip,m]*Nv[m,j,k,e])",
+                "CSE: Nv1[ip,jp,k,e]  = sum_float32(@m, V[jp,m]*Nv2[ip,m,k,e])",
+                "INv[ip,jp,kp,e] = sum_float32(@m, V[kp,m]*Nv1[ip,jp,m,e])",
+
+                # L2 project Nw back to Lagrange basis
+                "CSE: Nw2[ip,j,k,e]   = sum_float32(@m, V[ip,m]*Nw[m,j,k,e])",
+                "CSE: Nw1[ip,jp,k,e]  = sum_float32(@m, V[jp,m]*Nw2[ip,m,k,e])",
+                "INw[ip,jp,kp,e] = sum_float32(@m, V[kp,m]*Nw1[ip,jp,m,e])",
+
+                ],
+            [
+            lp.ArrayArg("u",   dtype, shape=field_shape, order=order),
+            lp.ArrayArg("v",   dtype, shape=field_shape, order=order),
+            lp.ArrayArg("w",   dtype, shape=field_shape, order=order),
+            lp.ArrayArg("INu",   dtype, shape=field_shape, order=order),
+            lp.ArrayArg("INv",   dtype, shape=field_shape, order=order),
+            lp.ArrayArg("INw",   dtype, shape=field_shape, order=order),
+            lp.ArrayArg("D",   dtype, shape=(M,M),  order=order),
+            lp.ArrayArg("I",   dtype, shape=(M, N), order=order),
+            lp.ArrayArg("V",   dtype, shape=(N, M), order=order),
+            lp.ScalarArg("K",  np.int32, approximately=1000),
+            ],
+            name="sem_advect", assumptions="K>=1")
+
+    print knl
+    1/0
+
+    knl = lp.split_dimension(knl, "e", 16, outer_tag="g.0")#, slabs=(0, 1))
+
+    knl = lp.tag_dimensions(knl, dict(i="l.0", j="l.1"))
+
+    print knl
+    #1/0
+
+    kernel_gen = lp.generate_loop_schedules(knl)
+    kernel_gen = lp.check_kernels(kernel_gen, dict(K=1000), kill_level_min=5)
+
+
+    K = 1000
+    lp.auto_test_vs_seq(seq_knl, ctx, kernel_gen,
+            op_count=0,
+            op_label="GFlops",
+            parameters={"K": K}, print_seq_code=True,)
+
+
+
+
+def test_interp_diff(ctx_factory):
+    1/0 # not ready
+    dtype = np.float32
+    ctx = ctx_factory()
+    order = "C"
+
+    N = 8
+    M = 8
+
+    from pymbolic import var
+    K_sym = var("K")
+
+    field_shape = (N, N, N, K_sym)
+    interim_field_shape = (M, M, M, K_sym)
+
+    # 1. direction-by-direction similarity transform on u
+    # 2. invert diagonal 
+    # 3. transform back (direction-by-direction)
+
+    # K - run-time symbolic
+    knl = lp.make_kernel(ctx.devices[0],
+            "[K] -> {[i,ip,j,jp,k,kp,e]: 0<=i,j,k<%d AND 0<=ip,jp,kp<%d 0<=e<K}" %M %N
+            [
+                "[|i,jp,kp] <float32>  u1[i ,jp,kp,e] = sum_float32(ip, I[i,ip]*u [ip,jp,kp,e])",
+                "[|i,j ,kp] <float32>  u2[i ,j ,kp,e] = sum_float32(jp, I[j,jp]*u1[i ,jp,kp,e])",
+                "[|i,j ,k ] <float32>  u3[i ,j ,k ,e] = sum_float32(kp, I[k,kp]*u2[i ,j ,kp,e])",
+                "[|i,j ,k ] <float32>  Pu[i ,j ,k ,e] = P[i,j,k,e]*u3[i,j,k,e]",
+                "[|i,j ,kp] <float32> Pu3[i ,j ,kp,e] = sum_float32(k, V[kp,k]*Pu[i ,j , k,e])",
+                "[|i,jp,kp] <float32> Pu2[i ,jp,kp,e] = sum_float32(j, V[jp,j]*Pu[i ,j ,kp,e])",
+                "Pu[ip,jp,kp,e] = sum_float32(i, V[ip,i]*Pu[i ,jp,kp,e])",
+                ],
+            [
+            lp.ArrayArg("u",   dtype, shape=field_shape, order=order),
+            lp.ArrayArg("P",   dtype, shape=interim_field_shape, order=order),
+            lp.ArrayArg("I",   dtype, shape=(M, N), order=order),
+            lp.ArrayArg("V",   dtype, shape=(N, M), order=order),
+            lp.ArrayArg("Pu",  dtype, shape=field_shape, order=order),
+            lp.ScalarArg("K",  np.int32, approximately=1000),
+            ],
+            name="sem_lap_precon", assumptions="K>=1")
+
+    print knl
+    1/0
+
+    knl = lp.split_dimension(knl, "e", 16, outer_tag="g.0")#, slabs=(0, 1))
+
+    knl = lp.tag_dimensions(knl, dict(i="l.0", j="l.1"))
+
+    print knl
+    #1/0
+
+    kernel_gen = lp.generate_loop_schedules(knl)
+    kernel_gen = lp.check_kernels(kernel_gen, dict(K=1000), kill_level_min=5)
+
+    lp.auto_test_vs_seq(seq_knl, ctx, kernel_gen,
+            op_count=0,
+            op_label="GFlops",
+            parameters={"K": K}, print_seq_code=True,)
+
+
+
+
 if __name__ == "__main__":
     import sys
     if len(sys.argv) > 1:
-- 
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