[MetaSchedule][M4a] PostProcessor: Disallow-Dynamic-Loop

python/tvm/meta_schedule/postproc/__init__.py

@@ -16,5 +16,6 @@
 # under the License.
 """The tvm.meta_schedule.postproc package."""
 from .postproc import Postproc, PyPostproc
+from .disallow_dynamic_loop import DisallowDynamicLoop
 from .rewrite_reduction_block import RewriteReductionBlock
 from .verify_gpu_code import VerifyGPUCode

python/tvm/meta_schedule/postproc/disallow_dynamic_loop.py

@@ -0,0 +1,31 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+"""A postprocessor that checks if the IRModule has any loop with non-constant extent"""
+
+from tvm._ffi.registry import register_object
+from .. import _ffi_api
+from .postproc import Postproc
+
+
+@register_object("meta_schedule.DisallowDynamicLoop")
+class DisallowDynamicLoop(Postproc):
+    """A postprocessor that checks if the IRModule has any loop with non-constant extent"""
+
+    def __init__(self) -> None:
+        self.__init_handle_by_constructor__(
+            _ffi_api.PostprocDisallowDynamicLoop,  # type: ignore # pylint: disable=no-member
+        )

src/meta_schedule/postproc/disallow_dynamic_loop.cc

@@ -0,0 +1,85 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+#include "../utils.h"
+
+namespace tvm {
+namespace tir {
+
+/*! \brief Check if an IRModule has any dynamic loop. */
+struct DynamicExtentFinder : private StmtVisitor {
+ public:
+  static bool Find(const IRModule& mod) {
+    DynamicExtentFinder finder;
+    for (const auto& kv : mod->functions) {
+      const BaseFunc& func = kv.second;
+      if (const auto* prim_func = func.as<PrimFuncNode>()) {
+        finder(prim_func->body);
+        if (finder.found_) {
+          return true;
+        }
+      }
+    }
+    return false;
+  }
+
+ private:
+  void VisitStmt_(const ForNode* loop) final {
+    if (!loop->extent->IsInstance<IntImmNode>()) {
+      found_ = true;
+    } else {
+      StmtVisitor::VisitStmt_(loop);
+    }
+  }
+
+  void VisitStmt(const Stmt& stmt) final {
+    if (!found_) {
+      StmtVisitor::VisitStmt(stmt);
+    }
+  }
+
+  bool found_ = false;
+};
+
+}  // namespace tir
+
+namespace meta_schedule {
+
+/*! \brief Check if the IRModule has any loop with non-constant extent. */
+class DisallowDynamicLoopNode : public PostprocNode {
+ public:
+  // Inherited from PostprocNode
+  void InitializeWithTuneContext(const TuneContext& context) final {}
+  // Inherited from PostprocNode
+  bool Apply(const tir::Schedule& sch) final { return !tir::DynamicExtentFinder::Find(sch->mod()); }
+
+  static constexpr const char* _type_key = "meta_schedule.DisallowDynamicLoop";
+  TVM_DECLARE_FINAL_OBJECT_INFO(DisallowDynamicLoopNode, PostprocNode);
+};
+
+Postproc Postproc::DisallowDynamicLoop() {
+  ObjectPtr<DisallowDynamicLoopNode> n = make_object<DisallowDynamicLoopNode>();
+  return Postproc(n);
+}
+
+TVM_REGISTER_NODE_TYPE(DisallowDynamicLoopNode);
+TVM_REGISTER_GLOBAL("meta_schedule.PostprocDisallowDynamicLoop")
+    .set_body_typed(Postproc::DisallowDynamicLoop);
+
+}  // namespace meta_schedule
+}  // namespace tvm

tests/python/unittest/test_meta_schedule_postproc_disallow_dynamic_loop.py

@@ -0,0 +1,100 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# pylint: disable=missing-module-docstring,missing-function-docstring,missing-class-docstring
+
+import tvm
+from tvm import tir
+from tvm.meta_schedule import TuneContext
+from tvm.meta_schedule.postproc import DisallowDynamicLoop
+from tvm.script import tir as T
+from tvm.target import Target
+
+
+def _target() -> Target:
+    return Target("cuda", host="llvm")
+
+
+def _create_context(mod, target) -> TuneContext:
+    ctx = TuneContext(
+        mod=mod,
+        target=target,
+        postprocs=[
+            DisallowDynamicLoop(),
+        ],
+        task_name="test",
+    )
+    for rule in ctx.postprocs:
+        rule.initialize_with_tune_context(ctx)
+    return ctx
+
+
+# pylint: disable=invalid-name,no-member,line-too-long,too-many-nested-blocks,no-self-argument
+# fmt: off
+
+@tvm.script.ir_module
+class Matmul:
+    @T.prim_func
+    def main(a: T.handle, b: T.handle, c: T.handle) -> None:
+        T.func_attr({"global_symbol": "main"})
+        A = T.match_buffer(a, (1024, 1024), "float32")
+        B = T.match_buffer(b, (1024, 1024), "float32")
+        C = T.match_buffer(c, (1024, 1024), "float32")
+        for i, j, k in T.grid(1024, 1024, 1024):
+            with T.block("matmul"):
+                vi, vj, vk = T.axis.remap("SSR", [i, j, k])
+                with T.init():
+                    C[vi, vj] = 0.0
+                C[vi, vj] = C[vi, vj] + A[vi, vk] * B[vk, vj]
+
+
+@tvm.script.ir_module
+class DynamicLoop:
+    @T.prim_func
+    def main(a: T.handle, b: T.handle, c: T.handle) -> None:
+        T.func_attr({"global_symbol": "main"})
+        A = T.match_buffer(a, (1024, 1024), "float32")
+        B = T.match_buffer(b, (1024, 1024), "float32")
+        C = T.match_buffer(c, (1024, 1024), "float32")
+        for i, j in T.grid(1024, 1024):
+            for k in T.serial(0, i):
+                with T.block("matmul"):
+                    vi, vj, vk = T.axis.remap("SSR", [i, j, k])
+                    with T.init():
+                        C[vi, vj] = 0.0
+                    C[vi, vj] = C[vi, vj] + A[vi, vk] * B[vk, vj]
+
+# fmt: on
+# pylint: enable=invalid-name,no-member,line-too-long,too-many-nested-blocks,no-self-argument
+
+
+def test_postproc_disallow_dynamic_loops():
+    mod = Matmul
+    ctx = _create_context(mod, target=_target())
+    sch = tir.Schedule(mod, debug_mask="all")
+    assert ctx.postprocs[0].apply(sch)
+
+
+def test_postproc_disallow_dynamic_loops_fail():
+    mod = DynamicLoop
+    ctx = _create_context(mod, target=_target())
+    sch = tir.Schedule(mod, debug_mask="all")
+    assert not ctx.postprocs[0].apply(sch)
+
+
+if __name__ == "__main__":
+    test_postproc_disallow_dynamic_loops()
+    test_postproc_disallow_dynamic_loops_fail()