[mlir] [llvm] [clang] [compiler-rt] [flang] [clang-tools-extra] [mlir][tosa] Add dialect version. (PR #79514)

[Jacques Pienaar via llvm-commits]

https://github.com/jpienaar updated https://github.com/llvm/llvm-project/pull/79514

>From 06386cb0d21bb8e210e5ee3eef26df39680fc1d1 Mon Sep 17 00:00:00 2001
From: Jacques Pienaar <jpienaar at google.com>
Date: Sat, 21 Oct 2023 17:06:33 -0700
Subject: [PATCH] [mlir][tosa] Add dialect version.

This adds a singular number for the bytecode version. Considered adding
spec related version, but decided that against that as

1) I think one may want to capture the minimum spec to execute
   separately (and it may be function of the ops in the module);
2) Its unrelated to reading the bytecode or upgrade/downgrade. So
   linking these together felt like linking error domains.
---
 mlir/include/mlir/Dialect/Tosa/IR/TosaOps.h |  7 +++++++
 mlir/lib/Dialect/Tosa/IR/TosaOps.cpp        | 22 ++++++++++++++++-----
 2 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/mlir/include/mlir/Dialect/Tosa/IR/TosaOps.h b/mlir/include/mlir/Dialect/Tosa/IR/TosaOps.h
index a9bc3351f4cff..062fb28f5ebe3 100644
--- a/mlir/include/mlir/Dialect/Tosa/IR/TosaOps.h
+++ b/mlir/include/mlir/Dialect/Tosa/IR/TosaOps.h
@@ -34,6 +34,13 @@ class PatternRewriter;
 
 namespace tosa {
 
+struct TosaDialectVersion : public mlir::DialectVersion {
+  TosaDialectVersion() = default;
+  TosaDialectVersion(uint32_t dialectVersion)
+      : dialectVersion(dialectVersion){};
+  uint32_t dialectVersion = 0;
+};
+
 ParseResult parseTypeOrAttr(OpAsmParser &parser, TypeAttr &typeAttr,
                             Attribute &attr);
 void printTypeOrAttr(OpAsmPrinter &p, Operation *op, TypeAttr type,
diff --git a/mlir/lib/Dialect/Tosa/IR/TosaOps.cpp b/mlir/lib/Dialect/Tosa/IR/TosaOps.cpp
index 729116da45e47..b4035cadce331 100644
--- a/mlir/lib/Dialect/Tosa/IR/TosaOps.cpp
+++ b/mlir/lib/Dialect/Tosa/IR/TosaOps.cpp
@@ -97,18 +97,30 @@ struct TosaDialectBytecodeInterface : public BytecodeDialectInterface {
   }
 
   void writeVersion(DialectBytecodeWriter &writer) const final {
-    // TODO: Populate.
+    // This is currently not being written currently to allow readers to update
+    // first.
+#if 0
+    // TODO: This could be refined to not just pick current version.
+    auto version = TosaDialectVersion();
+    writer.writeVarInt(version.dialectVersion);
+#endif
   }
 
   std::unique_ptr<DialectVersion>
   readVersion(DialectBytecodeReader &reader) const final {
-    // TODO: Populate
-    reader.emitError("Dialect does not support versioning");
-    return nullptr;
+    uint64_t dialectVersion;
+    if (failed(reader.readVarInt(dialectVersion)))
+      return nullptr;
+    auto version = std::make_unique<TosaDialectVersion>();
+    version->dialectVersion = dialectVersion;
+    return version;
   }
 
   LogicalResult upgradeFromVersion(Operation *topLevelOp,
-                                   const DialectVersion &version_) const final {
+                                   const DialectVersion &version) const final {
+    const auto &tosaVersion = static_cast<const TosaDialectVersion &>(version);
+    // No upgrades currently defined.
+    (void)tosaVersion;
     return success();
   }
 };