[TIR][REFACTOR] Remove ir_pass in favor of analysis/transform. (#5415)

This PR removes ir_pass(old style pass functions) in favor
of analysis/transform(new style pass manager).

include/tvm/te/schedule_pass.h

@@ -59,6 +59,15 @@ TVM_DLL void AutoInlineInjective(Schedule sch);
  */
 Map<IterVar, Range> InferBound(const Schedule& sch);
 
+/*!
+ * \brief Verify if there is any argument bound to compact buffer.
+ *
+ * \param stmt The stmt to be verified.
+ * \return true if there is any buffer_bind_scope attribute found,
+ *        otherwise, false.
+ */
+bool VerifyCompactBuffer(const Stmt& stmt);
+
 /*!
  * \brief Schedule s' dependent operations.
  *
@@ -72,7 +81,6 @@ Map<IterVar, Range> InferBound(const Schedule& sch);
  */
 Stmt ScheduleOps(Schedule s, Map<IterVar, Range> dom_map, bool debug_keep_trivial_loop);
 
-
 /*!
  * \brief Try to modify the AST generated by ScheduleOps to support TensorCore.
  *

include/tvm/tir/analysis.h

@@ -25,10 +25,11 @@
 #define TVM_TIR_ANALYSIS_H_
 
 #include <tvm/ir/module.h>
+#include <tvm/ir/transform.h>
 #include <tvm/tir/expr.h>
 #include <tvm/tir/function.h>
 #include <tvm/tir/stmt.h>
-
+#include <string>
 
 namespace tvm {
 namespace tir {
@@ -59,7 +60,47 @@ struct ExprDeepEqual {
  * \param defs The vars that is defined.
  * \return Array of undefined vars.
  */
-Array<Var> UndefinedVars(const Stmt& stmt, const Array<Var>& defs);
+TVM_DLL Array<Var> UndefinedVars(const Stmt& stmt, const Array<Var>& defs);
+
+/*!
+ * \brief Whether the expression have side effect.
+ * \param expr The expression to be checked.
+ * \return whether expression have side effect
+ */
+TVM_DLL bool HasSideEffect(const PrimExpr& expr);
+
+/*!
+ * \brief Whether e expression used any var in variable set..
+ * \param expr The expression to be checked.
+ * \param vset_contains The check function to see if var is in the vset.
+ * \return Whether e uses vset.
+ */
+TVM_DLL bool ExprUseVar(const PrimExpr& expr,
+                        std::function<bool(const VarNode*)> vset_contains);
+
+/*!
+ * \brief Whether e expression used var.
+ * \param expr The expression to be checked.
+ * \param var The variable.
+ * \return Whether e uses v.
+ */
+inline bool ExprUseVar(const PrimExpr& expr, const Var& var) {
+  return ExprUseVar(expr, [&](const VarNode* node) {
+    return var.get() == node;
+  });
+}
+
+
+/*!
+ * \brief Verifies whether the IR stmt or Expr is in SSA form.
+ *  That is: each Var is defined and assigned once(in Let/For)
+ *
+ * \param func The function to be verified.
+ * \return Whether IR is in SSA form.
+ *
+ * \note All passes in TIR consume and produce SSA form.
+ */
+TVM_DLL bool VerifySSA(const PrimFunc& func);
 
 /*!
  * \brief Verify if memory accesses are legal for a specific target device type.
@@ -68,11 +109,67 @@ Array<Var> UndefinedVars(const Stmt& stmt, const Array<Var>& defs);
  *  threads, CPU code is generated that tries to access GPU memory,
  *  which is illegal. This pass performs verification for this case.
  *
- * \param mod The module to be verified.
+ * \param func The function to be verified.
  * \return Success of memory verification.
  */
-void VerifyMemory(const IRModule& mod);
+TVM_DLL bool VerifyMemory(const PrimFunc& func);
+
+/*!
+ * \brief Verify the correctness of a GPU code
+ *        It will check the whether the amount of memory usage or the number of threads
+ *        in a block exceeds the limit
+ * \param func The function to be checked
+ * \param constraints The dict to specify constraints to check.
+ *        Possible keys are
+ *
+ *        "max_local_memory_per_block": Total amount of local memory per block (in bytes).
+ *        "max_shared_memory_per_block": Total amount of shared memory per block (in bytes).
+ *        "max_threads_per_block": Maximum number of threads per block.
+ *        "max_thread_x": Maximum length of threadIdx.x.
+ *        "max_thread_y": Maximum length of threadIdx.y.
+ *        "max_thread_z": Maximum length of threadIdx.z.
+ *
+ *        If one key is missing in this argument, the pass won't check for that item.
+ * \return valid Whether it is a valid GPU code
+ *
+ */
+TVM_DLL bool VerifyGPUCode(const PrimFunc& func,
+                           Map<std::string, PrimExpr> constraints);
+
+// Pass variants of verification analysis
+// directly throws RuntimeError when verification fails.
+namespace transform {
+
+using tvm::transform::Pass;
+using tvm::transform::PassContext;
+
+/*!
+ * \brief Pass variant of VerifySSA.
+ *
+ * \returns The pass.
+ * \sa tvm::tir::VerifySSA
+ */
+TVM_DLL Pass VerifySSA();
+
+/*!
+ * \brief Pass variant of VerifyMemory.
+ *
+ * \returns The pass.
+ * \sa tvm::tir::VerifyMemory
+ */
+TVM_DLL Pass VerifyMemory();
+
+/*!
+ * \brief Pass variant of VerifyGPUCode.
+ *
+ * \param constraints The dict to specify constraints to check.
+ *
+ * \returns The pass.
+ * \sa tvm::tir::VerifyGPUCode
+ */
+TVM_DLL Pass VerifyGPUCode(Map<std::string, PrimExpr> constraints);
 
+}  // namespace transform
 }  // namespace tir
 }  // namespace tvm
 #endif  // TVM_TIR_ANALYSIS_H_

include/tvm/tir/transform.h

@@ -228,7 +228,6 @@ TVM_DLL Pass InstrumentBoundCheckers();
  */
 TVM_DLL Pass MakePackedAPI(int num_unpacked_args);
 
-
 /*!
  * \brief Remap the thread axis
  *
@@ -241,7 +240,6 @@ TVM_DLL Pass MakePackedAPI(int num_unpacked_args);
  */
 TVM_DLL Pass RemapThreadAxis(Map<runtime::String, IterVar> axis_map);
 
-
 /*!
  * \brief Lower custom datatypes.
  *
@@ -251,6 +249,13 @@ TVM_DLL Pass RemapThreadAxis(Map<runtime::String, IterVar> axis_map);
  */
 TVM_DLL Pass LowerCustomDatatypes();
 
+/*!
+ * \brief Decorate all the function's body as device function.
+ *
+ * \return The pass.
+ */
+TVM_DLL Pass DecorateDeviceScope();
+
 /*!
  * \brief Split the function into a host function and device functions.
  *
@@ -334,6 +339,16 @@ TVM_DLL Pass CombineContextCall();
  */
 TVM_DLL Pass NarrowDataType(int target_bits);
 
+/*!
+ * \brief Rewrite the pointer content type of arguments,
+ *  as well as Alloc internal to the function to use
+ *  the most frequently accessed type for load/store
+ *  to avoid pointer casting in backend when possible.
+ *
+ * \return The pass.
+ */
+TVM_DLL Pass PointerValueTypeRewrite();
+
 }  // namespace transform
 }  // namespace tir
 }  // namespace tvm

python/tvm/autotvm/measure/measure_methods.py

@@ -35,7 +35,6 @@
 
 import tvm._ffi
 from tvm import nd, rpc as _rpc, target as _target
-from tvm.tir import ir_pass
 from tvm.error import TVMError
 from tvm.target import build_config
 from tvm.driver import build
@@ -616,7 +615,7 @@ def gpu_verify_pass(**kwargs):
     This pass will check memory usage and number of threads per block.
     """
     def verify_pass(f, *_):
-        valid = ir_pass.VerifyGPUCode(f.body, kwargs)
+        valid = tvm.analysis.verify_gpu_code(f, kwargs)
         if not valid:
             raise InstantiationError("Skipped because of invalid gpu kernel")
         return f

python/tvm/driver/build_module.py

@@ -26,7 +26,6 @@
 from tvm.ir import container
 from tvm.ir import CallingConv
 from tvm.target import codegen, BuildConfig
-from tvm.tir import ir_pass
 from tvm.te import tensor
 from tvm.te import schedule
 from tvm import target as _target
@@ -111,7 +110,7 @@ def form_irmodule(sch, args, name, binds):
     bounds = schedule.InferBound(sch)
     stmt = schedule.ScheduleOps(sch, bounds)
 
-    compact = ir_pass.VerifyCompactBuffer(stmt)
+    compact = schedule.VerifyCompactBuffer(stmt)
     binds, arg_list = get_binds(args, compact, binds)
 
     stmt = schedule.SchedulePostProcRewriteForTensorCore(stmt, sch, binds)
@@ -246,9 +245,8 @@ def _build_for_device(input_mod, target, target_host):
 
     mod_mixed = input_mod
     mod_mixed = tvm.tir.transform.Apply(lambda f: f.with_attr("target", target))(mod_mixed)
-    tvm.tir.analysis.verify_memory(mod_mixed)
 
-    opt_mixed = []
+    opt_mixed = [tvm.tir.transform.VerifyMemory()]
     if len(mod_mixed.functions) == 1:
         opt_mixed += [tvm.tir.transform.Apply(lambda f: f.with_attr("tir.is_entry_func", True))]
     if BuildConfig.current().detect_global_barrier: