1//===- NVVMAttachTarget.cpp - Attach an NVVM target -----------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements the `GpuNVVMAttachTarget` pass, attaching `#nvvm.target`
10// attributes to GPU modules.
11//
12//===----------------------------------------------------------------------===//
13
14#include "mlir/Dialect/GPU/Transforms/Passes.h"
15
16#include "mlir/Dialect/GPU/IR/GPUDialect.h"
17#include "mlir/Dialect/LLVMIR/NVVMDialect.h"
18#include "mlir/IR/Builders.h"
19#include "mlir/Pass/Pass.h"
20#include "mlir/Target/LLVM/NVVM/Target.h"
21#include "llvm/Support/Regex.h"
22
23namespace mlir {
24#define GEN_PASS_DEF_GPUNVVMATTACHTARGET
25#include "mlir/Dialect/GPU/Transforms/Passes.h.inc"
26} // namespace mlir
27
28using namespace mlir;
29using namespace mlir::NVVM;
30
31namespace {
32struct NVVMAttachTarget
33 : public impl::GpuNVVMAttachTargetBase<NVVMAttachTarget> {
34 using Base::Base;
35
36 DictionaryAttr getFlags(OpBuilder &builder) const;
37
38 void runOnOperation() override;
39
40 void getDependentDialects(DialectRegistry &registry) const override {
41 registry.insert<NVVM::NVVMDialect>();
42 }
43};
44} // namespace
45
46DictionaryAttr NVVMAttachTarget::getFlags(OpBuilder &builder) const {
47 UnitAttr unitAttr = builder.getUnitAttr();
48 SmallVector<NamedAttribute, 2> flags;
49 auto addFlag = [&](StringRef flag) {
50 flags.push_back(Elt: builder.getNamedAttr(name: flag, val: unitAttr));
51 };
52 if (fastFlag)
53 addFlag("fast");
54 if (ftzFlag)
55 addFlag("ftz");
56 if (!flags.empty())
57 return builder.getDictionaryAttr(flags);
58 return nullptr;
59}
60
61void NVVMAttachTarget::runOnOperation() {
62 OpBuilder builder(&getContext());
63 ArrayRef<std::string> libs(linkLibs);
64 SmallVector<StringRef> filesToLink(libs.begin(), libs.end());
65 auto target = builder.getAttr<NVVMTargetAttr>(
66 optLevel, triple, chip, features, getFlags(builder),
67 filesToLink.empty() ? nullptr : builder.getStrArrayAttr(filesToLink));
68 llvm::Regex matcher(moduleMatcher);
69 for (Region &region : getOperation()->getRegions())
70 for (Block &block : region.getBlocks())
71 for (auto module : block.getOps<gpu::GPUModuleOp>()) {
72 // Check if the name of the module matches.
73 if (!moduleMatcher.empty() && !matcher.match(module.getName()))
74 continue;
75 // Create the target array.
76 SmallVector<Attribute> targets;
77 if (std::optional<ArrayAttr> attrs = module.getTargets())
78 targets.append(attrs->getValue().begin(), attrs->getValue().end());
79 targets.push_back(target);
80 // Remove any duplicate targets.
81 targets.erase(std::unique(targets.begin(), targets.end()),
82 targets.end());
83 // Update the target attribute array.
84 module.setTargetsAttr(builder.getArrayAttr(targets));
85 }
86}
87

source code of mlir/lib/Dialect/GPU/Transforms/NVVMAttachTarget.cpp