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//===- ReduceVirtualRegisters.cpp - Specialized Delta Pass ----------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file implements a function which calls the Generic Delta pass in order
// to simplify virtual registers in MIR.
//
//===----------------------------------------------------------------------===//
#include "ReduceVirtualRegisters.h"
#include "Delta.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
using namespace llvm;
static void dropRegisterHintsFromFunction(Oracle &O, MachineFunction &MF) {
MachineRegisterInfo &MRI = MF.getRegInfo();
for (unsigned I = 0, E = MRI.getNumVirtRegs(); I != E; ++I) {
Register Reg = Register::index2VirtReg(I);
const std::pair<Register, SmallVector<Register, 4>> &Hints =
MRI.getRegAllocationHints(Reg);
if (Hints.second.empty())
continue;
if (!O.shouldKeep())
MRI.clearSimpleHint(Reg);
}
}
static void dropRegisterHintsFromFunctions(Oracle &O,
ReducerWorkItem &WorkItem) {
for (const Function &F : WorkItem.getModule()) {
if (auto *MF = WorkItem.MMI->getMachineFunction(F))
dropRegisterHintsFromFunction(O, *MF);
}
}
void llvm::reduceVirtualRegisterHintsDeltaPass(TestRunner &Test) {
runDeltaPass(Test, dropRegisterHintsFromFunctions,
"Reducing virtual register hints from functions");
}
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