[llvm-branch-commits] [mlir] [MLIR][ArmSVE] Add initial lowering of vector.contract to SVE `*MMLA` instructions (PR #135636)

[Momchil Velikov via llvm-branch-commits]

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@@ -0,0 +1,304 @@
+//===- LowerContractionToSMMLAPattern.cpp - Contract to SMMLA ---*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements lowering patterns from vector.contract to
+// SVE I8MM operations.
+//
+//===---
+
+#include "mlir/Dialect/Arith/IR/Arith.h"
+#include "mlir/Dialect/ArmSVE/IR/ArmSVEDialect.h"
+#include "mlir/Dialect/ArmSVE/Transforms/Transforms.h"
+#include "mlir/Dialect/Func/IR/FuncOps.h"
+#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
+#include "mlir/Dialect/Utils/IndexingUtils.h"
+#include "mlir/Dialect/Vector/IR/VectorOps.h"
+#include "mlir/IR/AffineMap.h"
+#include "mlir/IR/PatternMatch.h"
+#include "mlir/Transforms/GreedyPatternRewriteDriver.h"
+
+#include "mlir/Dialect/UB/IR/UBOps.h"
+
+#define DEBUG_TYPE "lower-contract-to-arm-sve-i8mm"
+
+using namespace mlir;
+using namespace mlir::arm_sve;
+
+namespace {
+// Check if the given value is a result of the operation `T` (which must be
+// sign- or zero- extend) from i8 to i32. Return the value before the extension.
+template <typename T>
+inline std::enable_if_t<(std::is_base_of_v<arith::ExtSIOp, T> ||
+                         std::is_base_of_v<arith::ExtUIOp, T>),
+                        std::optional<Value>>
----------------
momchil-velikov wrote:

Because it does not need to be checked at runtime. But fair enough, it should be a `static_assert`, as there's no ambiguity to resolve, and such use is quite common across the code base, e.g.
```
  static_assert(llvm::is_one_of<OpTy, PackOp, UnPackOp>::value,
                "applies to only pack or unpack operations");
```

https://github.com/llvm/llvm-project/pull/135636