xref: /freebsd/contrib/llvm-project/llvm/lib/Transforms/Utils/DXILUpgrade.cpp (revision f5f40dd63bc7acbb5312b26ac1ea1103c12352a6)
1 //===- DXILUpgrade.cpp - Upgrade DXIL metadata to LLVM constructs ---------===//
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 #include "llvm/Transforms/Utils/DXILUpgrade.h"
10 #include "llvm/IR/Constants.h"
11 #include "llvm/IR/Metadata.h"
12 #include "llvm/IR/Module.h"
13 #include "llvm/Support/Debug.h"
14 
15 using namespace llvm;
16 
17 #define DEBUG_TYPE "dxil-upgrade"
18 
19 static bool handleValVerMetadata(Module &M) {
20   NamedMDNode *ValVer = M.getNamedMetadata("dx.valver");
21   if (!ValVer)
22     return false;
23 
24   LLVM_DEBUG({
25     MDNode *N = ValVer->getOperand(0);
26     auto X = mdconst::extract<ConstantInt>(N->getOperand(0))->getZExtValue();
27     auto Y = mdconst::extract<ConstantInt>(N->getOperand(1))->getZExtValue();
28     dbgs() << "DXIL: validation version: " << X << "." << Y << "\n";
29   });
30   // We don't need the validation version internally, so we drop it.
31   ValVer->dropAllReferences();
32   ValVer->eraseFromParent();
33   return true;
34 }
35 
36 PreservedAnalyses DXILUpgradePass::run(Module &M, ModuleAnalysisManager &AM) {
37   PreservedAnalyses PA;
38   // We never add, remove, or change functions here.
39   PA.preserve<FunctionAnalysisManagerModuleProxy>();
40   PA.preserveSet<AllAnalysesOn<Function>>();
41 
42   bool Changed = false;
43   Changed |= handleValVerMetadata(M);
44 
45   if (!Changed)
46     return PreservedAnalyses::all();
47   return PA;
48 }
49