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//===- DXILUpgrade.cpp - Upgrade DXIL metadata to LLVM constructs ---------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Utils/DXILUpgrade.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/Debug.h"
using namespace llvm;
#define DEBUG_TYPE "dxil-upgrade"
static bool handleValVerMetadata(Module &M) {
NamedMDNode *ValVer = M.getNamedMetadata("dx.valver");
if (!ValVer)
return false;
LLVM_DEBUG({
MDNode *N = ValVer->getOperand(0);
auto X = mdconst::extract<ConstantInt>(N->getOperand(0))->getZExtValue();
auto Y = mdconst::extract<ConstantInt>(N->getOperand(1))->getZExtValue();
dbgs() << "DXIL: validation version: " << X << "." << Y << "\n";
});
// We don't need the validation version internally, so we drop it.
ValVer->dropAllReferences();
ValVer->eraseFromParent();
return true;
}
PreservedAnalyses DXILUpgradePass::run(Module &M, ModuleAnalysisManager &AM) {
PreservedAnalyses PA;
// We never add, remove, or change functions here.
PA.preserve<FunctionAnalysisManagerModuleProxy>();
PA.preserveSet<AllAnalysesOn<Function>>();
bool Changed = false;
Changed |= handleValVerMetadata(M);
if (!Changed)
return PreservedAnalyses::all();
return PA;
}
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