[Mlir-commits] [mlir] [mlir][Vector] Add utility for computing scalable value bounds (PR #83876)

[Benjamin Maxwell]

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@@ -0,0 +1,101 @@
+//===- ScalableValueBoundsConstraintSet.h - Scalable Value Bounds ---------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef MLIR_DIALECT_VECTOR_IR_SCALABLEVALUEBOUNDSCONSTRAINTSET_H
+#define MLIR_DIALECT_VECTOR_IR_SCALABLEVALUEBOUNDSCONSTRAINTSET_H
+
+#include "mlir/Analysis/Presburger/IntegerRelation.h"
+#include "mlir/Dialect/Vector/IR/VectorOps.h"
+#include "mlir/Interfaces/ValueBoundsOpInterface.h"
+
+namespace mlir::vector {
+
+namespace detail {
+
+// Parent class for the value bounds RTTIExtends. Uses protected inheritance to
+// hide all ValueBoundsConstraintSet methods by default (as some do not use the
+// ScalableValueBoundsConstraintSet, so may produce unexpected results).
+struct ValueBoundsConstraintSet : protected ::mlir::ValueBoundsConstraintSet {
+  using ::mlir::ValueBoundsConstraintSet::ValueBoundsConstraintSet;
+};
+} // namespace detail
+
+/// A version of `ValueBoundsConstraintSet` that can solve for scalable bounds.
+struct ScalableValueBoundsConstraintSet
+    : public llvm::RTTIExtends<ScalableValueBoundsConstraintSet,
+                               detail::ValueBoundsConstraintSet> {
+  ScalableValueBoundsConstraintSet(MLIRContext *context, unsigned vscaleMin,
+                                   unsigned vscaleMax)
+      : RTTIExtends(context), vscaleMin(vscaleMin), vscaleMax(vscaleMax){};
+
+  using RTTIExtends::bound;
+  using RTTIExtends::StopConditionFn;
+
+  /// A thin wrapper over an `AffineMap` which can represent a constant bound,
+  /// or a scalable bound (in terms of vscale). The `AffineMap` will always
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MacDue wrote:

Here I'm referring to the concept of `vscale`, not the vector dialect operation. 

https://github.com/llvm/llvm-project/pull/83876