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//===- llvm/CodeGen/GlobalISel/RegisterBank.cpp - Register Bank --*- C++ -*-==//
//
// 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
//
//===----------------------------------------------------------------------===//
/// \file
/// This file implements the RegisterBank class.
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/GlobalISel/RegisterBank.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/Support/Debug.h"
#define DEBUG_TYPE "registerbank"
using namespace llvm;
const unsigned RegisterBank::InvalidID = UINT_MAX;
RegisterBank::RegisterBank(
unsigned ID, const char *Name, unsigned Size,
const uint32_t *CoveredClasses, unsigned NumRegClasses)
: ID(ID), Name(Name), Size(Size) {
ContainedRegClasses.resize(NumRegClasses);
ContainedRegClasses.setBitsInMask(CoveredClasses);
}
bool RegisterBank::verify(const TargetRegisterInfo &TRI) const {
assert(isValid() && "Invalid register bank");
for (unsigned RCId = 0, End = TRI.getNumRegClasses(); RCId != End; ++RCId) {
const TargetRegisterClass &RC = *TRI.getRegClass(RCId);
if (!covers(RC))
continue;
// Verify that the register bank covers all the sub classes of the
// classes it covers.
// Use a different (slow in that case) method than
// RegisterBankInfo to find the subclasses of RC, to make sure
// both agree on the covers.
for (unsigned SubRCId = 0; SubRCId != End; ++SubRCId) {
const TargetRegisterClass &SubRC = *TRI.getRegClass(RCId);
if (!RC.hasSubClassEq(&SubRC))
continue;
// Verify that the Size of the register bank is big enough to cover
// all the register classes it covers.
assert(getSize() >= TRI.getRegSizeInBits(SubRC) &&
"Size is not big enough for all the subclasses!");
assert(covers(SubRC) && "Not all subclasses are covered");
}
}
return true;
}
bool RegisterBank::covers(const TargetRegisterClass &RC) const {
assert(isValid() && "RB hasn't been initialized yet");
return ContainedRegClasses.test(RC.getID());
}
bool RegisterBank::isValid() const {
return ID != InvalidID && Name != nullptr && Size != 0 &&
// A register bank that does not cover anything is useless.
!ContainedRegClasses.empty();
}
bool RegisterBank::operator==(const RegisterBank &OtherRB) const {
// There must be only one instance of a given register bank alive
// for the whole compilation.
// The RegisterBankInfo is supposed to enforce that.
assert((OtherRB.getID() != getID() || &OtherRB == this) &&
"ID does not uniquely identify a RegisterBank");
return &OtherRB == this;
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void RegisterBank::dump(const TargetRegisterInfo *TRI) const {
print(dbgs(), /* IsForDebug */ true, TRI);
}
#endif
void RegisterBank::print(raw_ostream &OS, bool IsForDebug,
const TargetRegisterInfo *TRI) const {
OS << getName();
if (!IsForDebug)
return;
OS << "(ID:" << getID() << ", Size:" << getSize() << ")\n"
<< "isValid:" << isValid() << '\n'
<< "Number of Covered register classes: " << ContainedRegClasses.count()
<< '\n';
// Print all the subclasses if we can.
// This register classes may not be properly initialized yet.
if (!TRI || ContainedRegClasses.empty())
return;
assert(ContainedRegClasses.size() == TRI->getNumRegClasses() &&
"TRI does not match the initialization process?");
bool IsFirst = true;
OS << "Covered register classes:\n";
for (unsigned RCId = 0, End = TRI->getNumRegClasses(); RCId != End; ++RCId) {
const TargetRegisterClass &RC = *TRI->getRegClass(RCId);
if (!covers(RC))
continue;
if (!IsFirst)
OS << ", ";
OS << TRI->getRegClassName(&RC);
IsFirst = false;
}
}
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