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Replace the old algorithm that emitted the "print the alias for an instruction"

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with the newer, cleaner model. It uses the IAPrinter class to hold the
information that is needed to match an instruction with its alias. This also
takes into account the available features of the platform.

There is one bit of ugliness. The way the logic determines if a pattern is
unique is O(N**2), which is gross. But in reality, the number of items it's
checking against isn't large. So while it's N**2, it shouldn't be a massive time
sink.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129110 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2011-04-07 21:20:06 +00:00
parent e578252c27
commit 44dcfd3625
6 changed files with 94 additions and 158 deletions
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8
include/llvm/MC/MCInstPrinter.h
View File

@ -25,9 +25,12 @@ protected:
/// assembly emission is disable.
raw_ostream *CommentStream;
const MCAsmInfo &MAI;
/// The current set of available features.
unsigned AvailableFeatures;
public:
MCInstPrinter(const MCAsmInfo &mai)
: CommentStream(0), MAI(mai) {}
: CommentStream(0), MAI(mai), AvailableFeatures(0) {}
virtual ~MCInstPrinter();
@ -44,6 +47,9 @@ public:
/// getRegName - Return the assembler register name.
virtual StringRef getRegName(unsigned RegNo) const;
unsigned getAvailableFeatures() const { return AvailableFeatures; }
void setAvailableFeatures(unsigned Value) { AvailableFeatures = Value; }
};
} // namespace llvm

15
lib/Target/X86/InstPrinter/X86ATTInstPrinter.cpp
View File

@ -15,6 +15,7 @@
#define DEBUG_TYPE "asm-printer"
#include "X86ATTInstPrinter.h"
#include "X86InstComments.h"
#include "X86Subtarget.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCExpr.h"
@ -22,11 +23,23 @@
#include "llvm/Support/Format.h"
#include "llvm/Support/FormattedStream.h"
#include "X86GenInstrNames.inc"
#include <map>
using namespace llvm;
// Include the auto-generated portion of the assembly writer.
#define GET_INSTRUCTION_NAME
#define PRINT_ALIAS_INSTR
#include "X86GenRegisterNames.inc"
#include "X86GenAsmWriter.inc"
#undef PRINT_ALIAS_INSTR
#undef GET_INSTRUCTION_NAME
X86ATTInstPrinter::X86ATTInstPrinter(TargetMachine &TM, const MCAsmInfo &MAI)
: MCInstPrinter(MAI) {
// Initialize the set of available features.
setAvailableFeatures(ComputeAvailableFeatures(
&TM.getSubtarget<X86Subtarget>()));
}
void X86ATTInstPrinter::printInst(const MCInst *MI, raw_ostream &OS) {
printInstruction(MI, OS);
@ -35,11 +48,11 @@ void X86ATTInstPrinter::printInst(const MCInst *MI, raw_ostream &OS) {
if (CommentStream)
EmitAnyX86InstComments(MI, *CommentStream, getRegisterName);
}
StringRef X86ATTInstPrinter::getOpcodeName(unsigned Opcode) const {
return getInstructionName(Opcode);
}
void X86ATTInstPrinter::printSSECC(const MCInst *MI, unsigned Op,
raw_ostream &O) {
switch (MI->getOperand(Op).getImm()) {

8
lib/Target/X86/InstPrinter/X86ATTInstPrinter.h
View File

@ -19,16 +19,20 @@
namespace llvm {
class MCOperand;
class X86Subtarget;
class TargetMachine;
class X86ATTInstPrinter : public MCInstPrinter {
public:
X86ATTInstPrinter(TargetMachine &TM, const MCAsmInfo &MAI)
: MCInstPrinter(MAI) {}
X86ATTInstPrinter(TargetMachine &TM, const MCAsmInfo &MAI);
virtual void printInst(const MCInst *MI, raw_ostream &OS);
virtual StringRef getOpcodeName(unsigned Opcode) const;
// Methods used to print the alias of an instruction.
unsigned ComputeAvailableFeatures(const X86Subtarget *Subtarget) const;
bool printAliasInstr(const MCInst *MI, raw_ostream &OS);
// Autogenerated by tblgen.
void printInstruction(const MCInst *MI, raw_ostream &OS);
static const char *getRegisterName(unsigned RegNo);

1
lib/Target/X86/InstPrinter/X86IntelInstPrinter.cpp
View File

@ -15,6 +15,7 @@
#define DEBUG_TYPE "asm-printer"
#include "X86IntelInstPrinter.h"
#include "X86InstComments.h"
#include "X86Subtarget.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCExpr.h"

1
lib/Target/X86/InstPrinter/X86IntelInstPrinter.h
View File

@ -35,7 +35,6 @@ public:
static const char *getRegisterName(unsigned RegNo);
static const char *getInstructionName(unsigned Opcode);
void printOperand(const MCInst *MI, unsigned OpNo, raw_ostream &O);
void printMemReference(const MCInst *MI, unsigned Op, raw_ostream &O);
void printSSECC(const MCInst *MI, unsigned Op, raw_ostream &O);

209
utils/TableGen/AsmWriterEmitter.cpp
View File

@ -626,26 +626,30 @@ public:
bool isOpMapped(StringRef Op) { return OpMap.find(Op) != OpMap.end(); }
void print(raw_ostream &O) {
unsigned Indent = 8;
if (Conds.empty() && ReqFeatures.empty()) {
O.indent(6) << "return true;\n";
return;
}
if (!Conds.empty())
O << "if (";
for (std::vector<std::string>::iterator
I = Conds.begin(), E = Conds.end(); I != E; ++I) {
if (I != Conds.begin()) {
O << " &&\n";
O.indent(Indent);
O.indent(8);
}
O << *I;
}
if (!ReqFeatures.empty()) {
if (Conds.begin() != Conds.end())
if (Conds.begin() != Conds.end()) {
O << " &&\n";
else
O.indent(8);
} else {
O << "if (";
}
std::string Req;
raw_string_ostream ReqO(Req);
@ -656,27 +660,20 @@ public:
ReqO << AWI.getFeatureInfo(*I)->getEnumName();
}
if (Conds.begin() != Conds.end()) O.indent(Indent);
O << "(AvailableFeatures & (" << ReqO.str() << ")) == ("
<< ReqO.str() << ')';
}
if (!Conds.empty() || !ReqFeatures.empty()) {
O << ") {\n";
Indent = 6;
} else {
Indent = 4;
}
O.indent(Indent) << "// " << Result << "\n";
O.indent(Indent) << "AsmString = \"" << AsmString << "\";\n";
O.indent(6) << "// " << Result << "\n";
O.indent(6) << "AsmString = \"" << AsmString << "\";\n";
for (std::map<StringRef, unsigned>::iterator
I = OpMap.begin(), E = OpMap.end(); I != E; ++I)
O.indent(Indent) << "OpMap[\"" << I->first << "\"] = "
O.indent(6) << "OpMap[\"" << I->first << "\"] = "
<< I->second << ";\n";
if (!Conds.empty() || !ReqFeatures.empty())
O.indent(6) << "break;\n";
O.indent(4) << '}';
}
@ -727,7 +724,7 @@ static void EmitSubtargetFeatureFlagEnumeration(AsmWriterInfo &Info,
O << " Feature_None = 0\n";
O << "};\n\n";
O << "} // end anonymous namespace\n";
O << "} // end anonymous namespace\n\n";
}
/// EmitComputeAvailableFeatures - Emit the function to compute the list of
@ -928,156 +925,72 @@ void AsmWriterEmitter::EmitPrintAliasInstruction(raw_ostream &O) {
if (CantHandle) continue;
IAPrinterMap[I->first].push_back(IAP);
#if 0
O.indent(4) << "// " << I->first << '\n';
O.indent(4);
IAP->print(O);
#endif
}
}
O << "#if 0\n";
EmitSubtargetFeatureFlagEnumeration(AWI, O);
EmitComputeAvailableFeatures(AWI, AsmWriter, Target, O);
O << "#endif\n\n";
O << "bool " << Target.getName() << ClassName
<< "::printAliasInstr(const " << MachineInstrClassName
<< " *MI, raw_ostream &OS) {\n";
if (AliasMap.empty() || !isMC) {
// FIXME: Support MachineInstr InstAliases?
std::string Cases;
raw_string_ostream CasesO(Cases);
for (std::map<std::string, std::vector<IAPrinter*> >::iterator
I = IAPrinterMap.begin(), E = IAPrinterMap.end(); I != E; ++I) {
std::vector<IAPrinter*> &IAPs = I->second;
std::vector<IAPrinter*> UniqueIAPs;
for (std::vector<IAPrinter*>::iterator
II = IAPs.begin(), IE = IAPs.end(); II != IE; ++II) {
IAPrinter *LHS = *II;
bool IsDup = false;
for (std::vector<IAPrinter*>::iterator
III = IAPs.begin(), IIE = IAPs.end(); III != IIE; ++III) {
IAPrinter *RHS = *III;
if (LHS != RHS && *LHS == *RHS) {
IsDup = true;
break;
}
}
if (!IsDup) UniqueIAPs.push_back(LHS);
}
if (UniqueIAPs.empty()) continue;
CasesO.indent(2) << "case " << I->first << ":\n";
for (std::vector<IAPrinter*>::iterator
II = UniqueIAPs.begin(), IE = UniqueIAPs.end(); II != IE; ++II) {
IAPrinter *IAP = *II;
CasesO.indent(4);
IAP->print(CasesO);
CasesO << '\n';
}
CasesO.indent(4) << "return true;\n";
}
if (CasesO.str().empty() || !isMC) {
O << " return true;\n";
O << "}\n\n";
O << "#endif // PRINT_ALIAS_INSTR\n";
return;
}
O << " StringRef AsmString;\n";
O << " std::map<StringRef, unsigned> OpMap;\n";
O << " switch (MI->getOpcode()) {\n";
O << " default: return true;\n";
for (std::map<std::string, std::vector<CodeGenInstAlias*> >::iterator
I = AliasMap.begin(), E = AliasMap.end(); I != E; ++I) {
std::vector<CodeGenInstAlias*> &Aliases = I->second;
std::map<std::string, unsigned> CondCount;
std::map<std::string, std::string> BodyMap;
std::string AsmString = "";
for (std::vector<CodeGenInstAlias*>::iterator
II = Aliases.begin(), IE = Aliases.end(); II != IE; ++II) {
const CodeGenInstAlias *CGA = *II;
AsmString = CGA->AsmString;
unsigned Indent = 8;
unsigned LastOpNo = CGA->ResultInstOperandIndex.size();
std::string Cond;
raw_string_ostream CondO(Cond);
CondO << "if (MI->getNumOperands() == " << LastOpNo;
std::map<StringRef, unsigned> OpMap;
bool CantHandle = false;
for (unsigned i = 0, e = LastOpNo; i != e; ++i) {
const CodeGenInstAlias::ResultOperand &RO = CGA->ResultOperands[i];
switch (RO.Kind) {
default: assert(0 && "unexpected InstAlias operand kind");
case CodeGenInstAlias::ResultOperand::K_Record: {
const Record *Rec = RO.getRecord();
StringRef ROName = RO.getName();
if (Rec->isSubClassOf("RegisterClass")) {
CondO << " &&\n";
CondO.indent(Indent) << "MI->getOperand(" << i << ").isReg() &&\n";
if (OpMap.find(ROName) == OpMap.end()) {
OpMap[ROName] = i;
CondO.indent(Indent)
<< "regIsInRegisterClass(RC_"
<< CGA->ResultOperands[i].getRecord()->getName()
<< ", MI->getOperand(" << i << ").getReg())";
} else {
CondO.indent(Indent)
<< "MI->getOperand(" << i
<< ").getReg() == MI->getOperand("
<< OpMap[ROName] << ").getReg()";
}
} else {
assert(Rec->isSubClassOf("Operand") && "Unexpected operand!");
// FIXME: We need to handle these situations.
CantHandle = true;
break;
}
break;
}
case CodeGenInstAlias::ResultOperand::K_Imm:
CondO << " &&\n";
CondO.indent(Indent) << "MI->getOperand(" << i << ").getImm() == ";
CondO << CGA->ResultOperands[i].getImm();
break;
case CodeGenInstAlias::ResultOperand::K_Reg:
CondO << " &&\n";
CondO.indent(Indent) << "MI->getOperand(" << i << ").getReg() == ";
CondO << Target.getName() << "::"
<< CGA->ResultOperands[i].getRegister()->getName();
break;
}
if (CantHandle) break;
}
if (CantHandle) continue;
CondO << ")";
std::string Body;
raw_string_ostream BodyO(Body);
BodyO << " // " << CGA->Result->getAsString() << "\n";
BodyO << " AsmString = \"" << AsmString << "\";\n";
for (std::map<StringRef, unsigned>::iterator
III = OpMap.begin(), IIE = OpMap.end(); III != IIE; ++III)
BodyO << " OpMap[\"" << III->first << "\"] = "
<< III->second << ";\n";
++CondCount[CondO.str()];
BodyMap[CondO.str()] = BodyO.str();
}
std::string Code;
raw_string_ostream CodeO(Code);
bool EmitElse = false;
for (std::map<std::string, unsigned>::iterator
II = CondCount.begin(), IE = CondCount.end(); II != IE; ++II) {
if (II->second != 1) continue;
CodeO << " ";
if (EmitElse) CodeO << "} else ";
CodeO << II->first << " {\n";
CodeO << BodyMap[II->first];
EmitElse = true;
}
if (CodeO.str().empty()) continue;
O << " case " << I->first << ":\n";
O << CodeO.str();
O << " }\n";
O << " break;\n";
}
O << " }\n\n";
O.indent(2) << "StringRef AsmString;\n";
O.indent(2) << "std::map<StringRef, unsigned> OpMap;\n";
O.indent(2) << "unsigned AvailableFeatures = getAvailableFeatures();\n\n";
O.indent(2) << "switch (MI->getOpcode()) {\n";
O.indent(2) << "default: return true;\n";
O << CasesO.str();
O.indent(2) << "}\n\n";
// Code that prints the alias, replacing the operands with the ones from the
// MCInst.
O << " if (AsmString.empty()) return true;\n";
O << " std::pair<StringRef, StringRef> ASM = AsmString.split(' ');\n";
O << " OS << '\\t' << ASM.first;\n";