[flang] [llvm] [mlir] [MLIR][OpenMP] Lowering nontemporal clause to LLVM IR for SIMD directive (PR #118751)

[Kaviya Rajendiran via llvm-commits]

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@@ -0,0 +1,76 @@
+//===- LowerNontemporal.cpp -------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Add nontemporal attributes to load and stores of variables marked as
+// nontemporal.
+//
+//===----------------------------------------------------------------------===//
+
+#include "flang/Optimizer/Dialect/FIROpsSupport.h"
+#include "flang/Optimizer/OpenMP/Passes.h"
+#include "mlir/Dialect/OpenMP/OpenMPDialect.h"
+
+using namespace mlir;
+
+namespace flangomp {
+#define GEN_PASS_DEF_LOWERNONTEMPORALPASS
+#include "flang/Optimizer/OpenMP/Passes.h.inc"
+} // namespace flangomp
+
+namespace {
+class LowerNontemporalPass
+    : public flangomp::impl::LowerNontemporalPassBase<LowerNontemporalPass> {
+  void addNonTemporalAttr(omp::SimdOp simdOp) {
+    if (simdOp.getNontemporalVars().empty())
+      return;
+
+    std::function<mlir::Value(mlir::Value)> getBaseOperand =
+        [&](mlir::Value operand) -> mlir::Value {
+      if (mlir::isa<mlir::BlockArgument>(operand) ||
+          (mlir::isa<fir::AllocaOp>(operand.getDefiningOp())) ||
+          (mlir::isa<fir::DeclareOp>(operand.getDefiningOp())))
+        return operand;
+
+      Operation *definingOp = operand.getDefiningOp();
+      if (definingOp) {
+        for (Value srcOp : definingOp->getOperands()) {
+          return getBaseOperand(srcOp);
+        }
+      }
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kaviya2510 wrote:

I modified the implementation of getBaseOperand() function as suggested. Could you please take a look at it?



https://github.com/llvm/llvm-project/pull/118751