[flang-commits] [flang] Enabling Intel GPU Integration. (PR #65539)

[Mehdi Amini via flang-commits]

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@@ -0,0 +1,70 @@
+//===- SerializeToSPIRV.cpp - Convert GPU kernel to SPIRV blob -------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This pass iterates all the SPIR-V modules in the top module and serializes
+/// each SPIR-V module to SPIR-V binary and then attachs the binary blob as a
+/// string attribute to the corresponding gpu module.
+///
+//===----------------------------------------------------------------------===//
+
+#include "mlir/Dialect/GPU/Transforms/Passes.h"
+
+#include "mlir/Dialect/GPU/IR/GPUDialect.h"
+#include "mlir/Dialect/GPU/Transforms/Passes.h"
+#include "mlir/Dialect/SPIRV/IR/SPIRVDialect.h"
+#include "mlir/Dialect/SPIRV/IR/SPIRVOps.h"
+#include "mlir/Target/SPIRV/Serialization.h"
+
+namespace mlir {
+#define GEN_PASS_DEF_GPUSERIALIZETOSPIRVPASS
+#include "mlir/Dialect/GPU/Transforms/Passes.h.inc"
+} // namespace mlir
+
+using namespace mlir;
+
+struct GpuSerializeToSPIRVPass : public mlir::impl::GpuSerializeToSPIRVPassBase<GpuSerializeToSPIRVPass> {
+public:
+  void runOnOperation() override {
+    auto mod = getOperation();
+    llvm::SmallVector<uint32_t, 0> spvBinary;
+    for (mlir::gpu::GPUModuleOp gpuMod : mod.getOps<gpu::GPUModuleOp>()) {
+      auto name = gpuMod.getName();
+      // check that the spv module has the same name with gpu module except the
+      // prefix "__spv__"
+      auto isSameMod = [&](spirv::ModuleOp spvMod) -> bool {
+        auto spvModName = spvMod.getName();
+        return spvModName->consume_front("__spv__") && spvModName == name;
+      };
+      auto spvMods = mod.getOps<spirv::ModuleOp>();
+      auto it = llvm::find_if(spvMods, isSameMod);
+      if (it == spvMods.end()) {
+        gpuMod.emitError() << "Unable to find corresponding SPIR-V module";
+        signalPassFailure();
+        return;
+      }
+      auto spvMod = *it;
+
+      spvBinary.clear();
+      // serialize the spv module to spv binary
+      if (mlir::failed(spirv::serialize(spvMod, spvBinary))) {
+        spvMod.emitError() << "Failed to serialize SPIR-V module";
+        signalPassFailure();
+        return;
+      }
+
+      // attach the spv binary to the gpu module
+      auto spvData =
+          llvm::StringRef(reinterpret_cast<const char *>(spvBinary.data()),
+                          spvBinary.size() * sizeof(uint32_t));
+      auto spvAttr = mlir::StringAttr::get(&getContext(), spvData);
+      gpuMod->setAttr(gpu::getDefaultGpuBinaryAnnotation(), spvAttr);
+      spvMod->erase();
+    }
+  }
+};
----------------
joker-eph wrote:

@fabianmcg : how would that fit in the new serialization flow?

https://github.com/llvm/llvm-project/pull/65539