forked from OSchip/llvm-project
530 lines
17 KiB
C++
530 lines
17 KiB
C++
//===--------------------- PredicateExpander.cpp --------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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/// \file
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/// Functionalities used by the Tablegen backends to expand machine predicates.
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//
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//===----------------------------------------------------------------------===//
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#include "PredicateExpander.h"
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#include "CodeGenSchedule.h" // Definition of STIPredicateFunction.
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namespace llvm {
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void PredicateExpander::expandTrue(raw_ostream &OS) { OS << "true"; }
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void PredicateExpander::expandFalse(raw_ostream &OS) { OS << "false"; }
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void PredicateExpander::expandCheckImmOperand(raw_ostream &OS, int OpIndex,
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int ImmVal,
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StringRef FunctionMapper) {
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if (!FunctionMapper.empty())
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OS << FunctionMapper << "(";
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OS << "MI" << (isByRef() ? "." : "->") << "getOperand(" << OpIndex
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<< ").getImm()";
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if (!FunctionMapper.empty())
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OS << ")";
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OS << (shouldNegate() ? " != " : " == ") << ImmVal;
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}
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void PredicateExpander::expandCheckImmOperand(raw_ostream &OS, int OpIndex,
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StringRef ImmVal,
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StringRef FunctionMapper) {
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if (ImmVal.empty())
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expandCheckImmOperandSimple(OS, OpIndex, FunctionMapper);
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if (!FunctionMapper.empty())
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OS << FunctionMapper << "(";
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OS << "MI" << (isByRef() ? "." : "->") << "getOperand(" << OpIndex
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<< ").getImm()";
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if (!FunctionMapper.empty())
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OS << ")";
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OS << (shouldNegate() ? " != " : " == ") << ImmVal;
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}
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void PredicateExpander::expandCheckImmOperandSimple(raw_ostream &OS,
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int OpIndex,
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StringRef FunctionMapper) {
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if (shouldNegate())
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OS << "!";
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if (!FunctionMapper.empty())
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OS << FunctionMapper << "(";
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OS << "MI" << (isByRef() ? "." : "->") << "getOperand(" << OpIndex
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<< ").getImm()";
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if (!FunctionMapper.empty())
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OS << ")";
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}
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void PredicateExpander::expandCheckRegOperand(raw_ostream &OS, int OpIndex,
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const Record *Reg,
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StringRef FunctionMapper) {
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assert(Reg->isSubClassOf("Register") && "Expected a register Record!");
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if (!FunctionMapper.empty())
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OS << FunctionMapper << "(";
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OS << "MI" << (isByRef() ? "." : "->") << "getOperand(" << OpIndex
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<< ").getReg()";
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if (!FunctionMapper.empty())
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OS << ")";
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OS << (shouldNegate() ? " != " : " == ");
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const StringRef Str = Reg->getValueAsString("Namespace");
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if (!Str.empty())
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OS << Str << "::";
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OS << Reg->getName();
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}
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void PredicateExpander::expandCheckRegOperandSimple(raw_ostream &OS,
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int OpIndex,
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StringRef FunctionMapper) {
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if (shouldNegate())
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OS << "!";
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if (!FunctionMapper.empty())
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OS << FunctionMapper << "(";
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OS << "MI" << (isByRef() ? "." : "->") << "getOperand(" << OpIndex
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<< ").getReg()";
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if (!FunctionMapper.empty())
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OS << ")";
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}
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void PredicateExpander::expandCheckInvalidRegOperand(raw_ostream &OS,
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int OpIndex) {
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OS << "MI" << (isByRef() ? "." : "->") << "getOperand(" << OpIndex
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<< ").getReg() " << (shouldNegate() ? "!= " : "== ") << "0";
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}
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void PredicateExpander::expandCheckSameRegOperand(raw_ostream &OS, int First,
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int Second) {
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OS << "MI" << (isByRef() ? "." : "->") << "getOperand(" << First
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<< ").getReg() " << (shouldNegate() ? "!=" : "==") << " MI"
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<< (isByRef() ? "." : "->") << "getOperand(" << Second << ").getReg()";
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}
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void PredicateExpander::expandCheckNumOperands(raw_ostream &OS, int NumOps) {
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OS << "MI" << (isByRef() ? "." : "->") << "getNumOperands() "
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<< (shouldNegate() ? "!= " : "== ") << NumOps;
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}
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void PredicateExpander::expandCheckOpcode(raw_ostream &OS, const Record *Inst) {
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OS << "MI" << (isByRef() ? "." : "->") << "getOpcode() "
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<< (shouldNegate() ? "!= " : "== ") << Inst->getValueAsString("Namespace")
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<< "::" << Inst->getName();
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}
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void PredicateExpander::expandCheckOpcode(raw_ostream &OS,
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const RecVec &Opcodes) {
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assert(!Opcodes.empty() && "Expected at least one opcode to check!");
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bool First = true;
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if (Opcodes.size() == 1) {
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OS << "( ";
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expandCheckOpcode(OS, Opcodes[0]);
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OS << " )";
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return;
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}
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OS << '(';
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increaseIndentLevel();
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for (const Record *Rec : Opcodes) {
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OS << '\n';
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OS.indent(getIndentLevel() * 2);
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if (!First)
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OS << (shouldNegate() ? "&& " : "|| ");
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expandCheckOpcode(OS, Rec);
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First = false;
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}
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OS << '\n';
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decreaseIndentLevel();
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OS.indent(getIndentLevel() * 2);
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OS << ')';
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}
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void PredicateExpander::expandCheckPseudo(raw_ostream &OS,
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const RecVec &Opcodes) {
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if (shouldExpandForMC())
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expandFalse(OS);
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else
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expandCheckOpcode(OS, Opcodes);
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}
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void PredicateExpander::expandPredicateSequence(raw_ostream &OS,
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const RecVec &Sequence,
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bool IsCheckAll) {
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assert(!Sequence.empty() && "Found an invalid empty predicate set!");
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if (Sequence.size() == 1)
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return expandPredicate(OS, Sequence[0]);
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// Okay, there is more than one predicate in the set.
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bool First = true;
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OS << (shouldNegate() ? "!(" : "(");
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increaseIndentLevel();
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bool OldValue = shouldNegate();
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setNegatePredicate(false);
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for (const Record *Rec : Sequence) {
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OS << '\n';
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OS.indent(getIndentLevel() * 2);
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if (!First)
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OS << (IsCheckAll ? "&& " : "|| ");
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expandPredicate(OS, Rec);
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First = false;
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}
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OS << '\n';
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decreaseIndentLevel();
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OS.indent(getIndentLevel() * 2);
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OS << ')';
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setNegatePredicate(OldValue);
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}
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void PredicateExpander::expandTIIFunctionCall(raw_ostream &OS,
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StringRef MethodName) {
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OS << (shouldNegate() ? "!" : "");
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OS << TargetName << (shouldExpandForMC() ? "_MC::" : "InstrInfo::");
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OS << MethodName << (isByRef() ? "(MI)" : "(*MI)");
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}
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void PredicateExpander::expandCheckIsRegOperand(raw_ostream &OS, int OpIndex) {
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OS << (shouldNegate() ? "!" : "") << "MI" << (isByRef() ? "." : "->")
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<< "getOperand(" << OpIndex << ").isReg() ";
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}
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void PredicateExpander::expandCheckIsImmOperand(raw_ostream &OS, int OpIndex) {
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OS << (shouldNegate() ? "!" : "") << "MI" << (isByRef() ? "." : "->")
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<< "getOperand(" << OpIndex << ").isImm() ";
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}
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void PredicateExpander::expandCheckFunctionPredicate(raw_ostream &OS,
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StringRef MCInstFn,
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StringRef MachineInstrFn) {
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OS << (shouldExpandForMC() ? MCInstFn : MachineInstrFn)
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<< (isByRef() ? "(MI)" : "(*MI)");
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}
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void PredicateExpander::expandCheckNonPortable(raw_ostream &OS,
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StringRef Code) {
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if (shouldExpandForMC())
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return expandFalse(OS);
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OS << '(' << Code << ')';
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}
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void PredicateExpander::expandReturnStatement(raw_ostream &OS,
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const Record *Rec) {
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std::string Buffer;
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raw_string_ostream SS(Buffer);
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SS << "return ";
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expandPredicate(SS, Rec);
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SS << ";";
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SS.flush();
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OS << Buffer;
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}
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void PredicateExpander::expandOpcodeSwitchCase(raw_ostream &OS,
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const Record *Rec) {
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const RecVec &Opcodes = Rec->getValueAsListOfDefs("Opcodes");
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for (const Record *Opcode : Opcodes) {
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OS.indent(getIndentLevel() * 2);
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OS << "case " << Opcode->getValueAsString("Namespace")
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<< "::" << Opcode->getName() << ":\n";
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}
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increaseIndentLevel();
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OS.indent(getIndentLevel() * 2);
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expandStatement(OS, Rec->getValueAsDef("CaseStmt"));
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decreaseIndentLevel();
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}
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void PredicateExpander::expandOpcodeSwitchStatement(raw_ostream &OS,
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const RecVec &Cases,
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const Record *Default) {
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std::string Buffer;
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raw_string_ostream SS(Buffer);
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SS << "switch(MI" << (isByRef() ? "." : "->") << "getOpcode()) {\n";
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for (const Record *Rec : Cases) {
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expandOpcodeSwitchCase(SS, Rec);
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SS << '\n';
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}
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// Expand the default case.
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SS.indent(getIndentLevel() * 2);
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SS << "default:\n";
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increaseIndentLevel();
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SS.indent(getIndentLevel() * 2);
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expandStatement(SS, Default);
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decreaseIndentLevel();
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SS << '\n';
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SS.indent(getIndentLevel() * 2);
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SS << "} // end of switch-stmt";
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SS.flush();
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OS << Buffer;
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}
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void PredicateExpander::expandStatement(raw_ostream &OS, const Record *Rec) {
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// Assume that padding has been added by the caller.
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if (Rec->isSubClassOf("MCOpcodeSwitchStatement")) {
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expandOpcodeSwitchStatement(OS, Rec->getValueAsListOfDefs("Cases"),
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Rec->getValueAsDef("DefaultCase"));
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return;
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}
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if (Rec->isSubClassOf("MCReturnStatement")) {
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expandReturnStatement(OS, Rec->getValueAsDef("Pred"));
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return;
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}
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llvm_unreachable("No known rules to expand this MCStatement");
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}
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void PredicateExpander::expandPredicate(raw_ostream &OS, const Record *Rec) {
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// Assume that padding has been added by the caller.
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if (Rec->isSubClassOf("MCTrue")) {
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if (shouldNegate())
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return expandFalse(OS);
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return expandTrue(OS);
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}
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if (Rec->isSubClassOf("MCFalse")) {
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if (shouldNegate())
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return expandTrue(OS);
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return expandFalse(OS);
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}
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if (Rec->isSubClassOf("CheckNot")) {
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flipNegatePredicate();
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expandPredicate(OS, Rec->getValueAsDef("Pred"));
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flipNegatePredicate();
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return;
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}
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if (Rec->isSubClassOf("CheckIsRegOperand"))
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return expandCheckIsRegOperand(OS, Rec->getValueAsInt("OpIndex"));
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if (Rec->isSubClassOf("CheckIsImmOperand"))
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return expandCheckIsImmOperand(OS, Rec->getValueAsInt("OpIndex"));
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if (Rec->isSubClassOf("CheckRegOperand"))
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return expandCheckRegOperand(OS, Rec->getValueAsInt("OpIndex"),
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Rec->getValueAsDef("Reg"),
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Rec->getValueAsString("FunctionMapper"));
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if (Rec->isSubClassOf("CheckRegOperandSimple"))
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return expandCheckRegOperandSimple(OS, Rec->getValueAsInt("OpIndex"),
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Rec->getValueAsString("FunctionMapper"));
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if (Rec->isSubClassOf("CheckInvalidRegOperand"))
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return expandCheckInvalidRegOperand(OS, Rec->getValueAsInt("OpIndex"));
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if (Rec->isSubClassOf("CheckImmOperand"))
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return expandCheckImmOperand(OS, Rec->getValueAsInt("OpIndex"),
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Rec->getValueAsInt("ImmVal"),
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Rec->getValueAsString("FunctionMapper"));
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if (Rec->isSubClassOf("CheckImmOperand_s"))
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return expandCheckImmOperand(OS, Rec->getValueAsInt("OpIndex"),
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Rec->getValueAsString("ImmVal"),
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Rec->getValueAsString("FunctionMapper"));
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if (Rec->isSubClassOf("CheckImmOperandSimple"))
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return expandCheckImmOperandSimple(OS, Rec->getValueAsInt("OpIndex"),
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Rec->getValueAsString("FunctionMapper"));
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if (Rec->isSubClassOf("CheckSameRegOperand"))
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return expandCheckSameRegOperand(OS, Rec->getValueAsInt("FirstIndex"),
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Rec->getValueAsInt("SecondIndex"));
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if (Rec->isSubClassOf("CheckNumOperands"))
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return expandCheckNumOperands(OS, Rec->getValueAsInt("NumOps"));
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if (Rec->isSubClassOf("CheckPseudo"))
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return expandCheckPseudo(OS, Rec->getValueAsListOfDefs("ValidOpcodes"));
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if (Rec->isSubClassOf("CheckOpcode"))
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return expandCheckOpcode(OS, Rec->getValueAsListOfDefs("ValidOpcodes"));
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if (Rec->isSubClassOf("CheckAll"))
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return expandPredicateSequence(OS, Rec->getValueAsListOfDefs("Predicates"),
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/* AllOf */ true);
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if (Rec->isSubClassOf("CheckAny"))
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return expandPredicateSequence(OS, Rec->getValueAsListOfDefs("Predicates"),
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/* AllOf */ false);
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if (Rec->isSubClassOf("CheckFunctionPredicate"))
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return expandCheckFunctionPredicate(
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OS, Rec->getValueAsString("MCInstFnName"),
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Rec->getValueAsString("MachineInstrFnName"));
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if (Rec->isSubClassOf("CheckNonPortable"))
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return expandCheckNonPortable(OS, Rec->getValueAsString("CodeBlock"));
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if (Rec->isSubClassOf("TIIPredicate"))
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return expandTIIFunctionCall(OS, Rec->getValueAsString("FunctionName"));
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llvm_unreachable("No known rules to expand this MCInstPredicate");
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}
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void STIPredicateExpander::expandHeader(raw_ostream &OS,
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const STIPredicateFunction &Fn) {
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const Record *Rec = Fn.getDeclaration();
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StringRef FunctionName = Rec->getValueAsString("Name");
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OS.indent(getIndentLevel() * 2);
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OS << "bool ";
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if (shouldExpandDefinition())
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OS << getClassPrefix() << "::";
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OS << FunctionName << "(";
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if (shouldExpandForMC())
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OS << "const MCInst " << (isByRef() ? "&" : "*") << "MI";
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else
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OS << "const MachineInstr " << (isByRef() ? "&" : "*") << "MI";
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if (Rec->getValueAsBit("UpdatesOpcodeMask"))
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OS << ", APInt &Mask";
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OS << (shouldExpandForMC() ? ", unsigned ProcessorID) const " : ") const ");
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if (shouldExpandDefinition()) {
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OS << "{\n";
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return;
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}
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if (Rec->getValueAsBit("OverridesBaseClassMember"))
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OS << "override";
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OS << ";\n";
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}
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void STIPredicateExpander::expandPrologue(raw_ostream &OS,
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const STIPredicateFunction &Fn) {
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RecVec Delegates = Fn.getDeclaration()->getValueAsListOfDefs("Delegates");
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bool UpdatesOpcodeMask =
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Fn.getDeclaration()->getValueAsBit("UpdatesOpcodeMask");
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increaseIndentLevel();
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unsigned IndentLevel = getIndentLevel();
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for (const Record *Delegate : Delegates) {
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OS.indent(IndentLevel * 2);
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OS << "if (" << Delegate->getValueAsString("Name") << "(MI";
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if (UpdatesOpcodeMask)
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OS << ", Mask";
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if (shouldExpandForMC())
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OS << ", ProcessorID";
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OS << "))\n";
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OS.indent((1 + IndentLevel) * 2);
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OS << "return true;\n\n";
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}
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if (shouldExpandForMC())
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return;
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OS.indent(IndentLevel * 2);
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OS << "unsigned ProcessorID = getSchedModel().getProcessorID();\n";
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}
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void STIPredicateExpander::expandOpcodeGroup(raw_ostream &OS, const OpcodeGroup &Group,
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bool ShouldUpdateOpcodeMask) {
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const OpcodeInfo &OI = Group.getOpcodeInfo();
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for (const PredicateInfo &PI : OI.getPredicates()) {
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const APInt &ProcModelMask = PI.ProcModelMask;
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bool FirstProcID = true;
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for (unsigned I = 0, E = ProcModelMask.getActiveBits(); I < E; ++I) {
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if (!ProcModelMask[I])
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continue;
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if (FirstProcID) {
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OS.indent(getIndentLevel() * 2);
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OS << "if (ProcessorID == " << I;
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} else {
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OS << " || ProcessorID == " << I;
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}
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FirstProcID = false;
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}
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OS << ") {\n";
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increaseIndentLevel();
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OS.indent(getIndentLevel() * 2);
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if (ShouldUpdateOpcodeMask) {
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if (PI.OperandMask.isNullValue())
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OS << "Mask.clearAllBits();\n";
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else
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OS << "Mask = " << PI.OperandMask << ";\n";
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OS.indent(getIndentLevel() * 2);
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}
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OS << "return ";
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expandPredicate(OS, PI.Predicate);
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OS << ";\n";
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decreaseIndentLevel();
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OS.indent(getIndentLevel() * 2);
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OS << "}\n";
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}
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}
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void STIPredicateExpander::expandBody(raw_ostream &OS,
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const STIPredicateFunction &Fn) {
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bool UpdatesOpcodeMask =
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Fn.getDeclaration()->getValueAsBit("UpdatesOpcodeMask");
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unsigned IndentLevel = getIndentLevel();
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OS.indent(IndentLevel * 2);
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OS << "switch(MI" << (isByRef() ? "." : "->") << "getOpcode()) {\n";
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OS.indent(IndentLevel * 2);
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OS << "default:\n";
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OS.indent(IndentLevel * 2);
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OS << " break;";
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for (const OpcodeGroup &Group : Fn.getGroups()) {
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for (const Record *Opcode : Group.getOpcodes()) {
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OS << '\n';
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OS.indent(IndentLevel * 2);
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OS << "case " << getTargetName() << "::" << Opcode->getName() << ":";
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}
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OS << '\n';
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increaseIndentLevel();
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expandOpcodeGroup(OS, Group, UpdatesOpcodeMask);
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OS.indent(getIndentLevel() * 2);
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OS << "break;\n";
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decreaseIndentLevel();
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}
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OS.indent(IndentLevel * 2);
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OS << "}\n";
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}
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void STIPredicateExpander::expandEpilogue(raw_ostream &OS,
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const STIPredicateFunction &Fn) {
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OS << '\n';
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OS.indent(getIndentLevel() * 2);
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OS << "return ";
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expandPredicate(OS, Fn.getDefaultReturnPredicate());
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OS << ";\n";
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decreaseIndentLevel();
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OS.indent(getIndentLevel() * 2);
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StringRef FunctionName = Fn.getDeclaration()->getValueAsString("Name");
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OS << "} // " << ClassPrefix << "::" << FunctionName << "\n\n";
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}
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void STIPredicateExpander::expandSTIPredicate(raw_ostream &OS,
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const STIPredicateFunction &Fn) {
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const Record *Rec = Fn.getDeclaration();
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if (shouldExpandForMC() && !Rec->getValueAsBit("ExpandForMC"))
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return;
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expandHeader(OS, Fn);
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if (shouldExpandDefinition()) {
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expandPrologue(OS, Fn);
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expandBody(OS, Fn);
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expandEpilogue(OS, Fn);
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}
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}
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} // namespace llvm
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