mirror of
https://github.com/llvm/llvm-project.git
synced 2025-05-03 08:36:07 +00:00
52 lines
2.0 KiB
C++
52 lines
2.0 KiB
C++
//===-- llvm/CodeGen/AllocationOrder.cpp - Allocation Order ---------------===//
|
|
//
|
|
// 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 an allocation order for virtual registers.
|
|
//
|
|
// The preferred allocation order for a virtual register depends on allocation
|
|
// hints and target hooks. The AllocationOrder class encapsulates all of that.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "AllocationOrder.h"
|
|
#include "llvm/CodeGen/MachineFunction.h"
|
|
#include "llvm/CodeGen/MachineRegisterInfo.h"
|
|
#include "llvm/CodeGen/RegisterClassInfo.h"
|
|
#include "llvm/CodeGen/VirtRegMap.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
|
|
using namespace llvm;
|
|
|
|
#define DEBUG_TYPE "regalloc"
|
|
|
|
// Compare VirtRegMap::getRegAllocPref().
|
|
AllocationOrder AllocationOrder::create(unsigned VirtReg, const VirtRegMap &VRM,
|
|
const RegisterClassInfo &RegClassInfo,
|
|
const LiveRegMatrix *Matrix) {
|
|
const MachineFunction &MF = VRM.getMachineFunction();
|
|
const TargetRegisterInfo *TRI = &VRM.getTargetRegInfo();
|
|
auto Order = RegClassInfo.getOrder(MF.getRegInfo().getRegClass(VirtReg));
|
|
SmallVector<MCPhysReg, 16> Hints;
|
|
bool HardHints =
|
|
TRI->getRegAllocationHints(VirtReg, Order, Hints, MF, &VRM, Matrix);
|
|
|
|
LLVM_DEBUG({
|
|
if (!Hints.empty()) {
|
|
dbgs() << "hints:";
|
|
for (MCPhysReg Hint : Hints)
|
|
dbgs() << ' ' << printReg(Hint, TRI);
|
|
dbgs() << '\n';
|
|
}
|
|
});
|
|
assert(all_of(Hints,
|
|
[&](MCPhysReg Hint) { return is_contained(Order, Hint); }) &&
|
|
"Target hint is outside allocation order.");
|
|
return AllocationOrder(std::move(Hints), Order, HardHints);
|
|
}
|