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//===-- AutoUpgrade.cpp - Implement auto-upgrade helper functions ---------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Reid Spencer and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the auto-upgrade helper functions
//
//===----------------------------------------------------------------------===//
#include "llvm/Assembly/AutoUpgrade.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/Module.h"
#include "llvm/Instructions.h"
#include "llvm/Intrinsics.h"
#include "llvm/SymbolTable.h"
#include <iostream>
using namespace llvm;
// Utility function for getting the correct suffix given a type
static inline const char* get_suffix(const Type* Ty) {
switch (Ty->getTypeID()) {
case Type::UIntTyID: return ".i32";
case Type::UShortTyID: return ".i16";
case Type::UByteTyID: return ".i8";
case Type::ULongTyID: return ".i64";
case Type::FloatTyID: return ".f32";
case Type::DoubleTyID: return ".f64";
default: break;
}
return 0;
}
static inline const Type* getTypeFromFunctionName(Function* F) {
// If there's no function, we can't get the argument type.
if (!F)
return 0;
// Get the Function's name.
const std::string& Name = F->getName();
// Quickly eliminate it, if it's not a candidate.
if (Name.length() <= 8 || Name[0] != 'l' || Name[1] != 'l' || Name[2] !=
'v' || Name[3] != 'm' || Name[4] != '.')
return 0;
switch (Name[5]) {
case 'b':
if (Name == "llvm.bswap")
return F->getReturnType();
break;
case 'c':
if (Name == "llvm.ctpop" || Name == "llvm.ctlz" || Name == "llvm.cttz")
return F->getReturnType();
break;
case 'i':
if (Name == "llvm.isunordered") {
Function::const_arg_iterator ArgIt = F->arg_begin();
if (ArgIt != F->arg_end())
return ArgIt->getType();
}
break;
case 's':
if (Name == "llvm.sqrt")
return F->getReturnType();
break;
default:
break;
}
return 0;
}
bool llvm::IsUpgradeableIntrinsicName(const std::string& Name) {
// Quickly eliminate it, if it's not a candidate.
if (Name.length() <= 5 || Name[0] != 'l' || Name[1] != 'l' || Name[2] !=
'v' || Name[3] != 'm' || Name[4] != '.')
return false;
switch (Name[5]) {
case 'b':
if (Name == "llvm.bswap")
return true;
break;
case 'c':
if (Name == "llvm.ctpop" || Name == "llvm.ctlz" || Name == "llvm.cttz")
return true;
break;
case 'i':
if (Name == "llvm.isunordered")
return true;
break;
case 's':
if (Name == "llvm.sqrt")
return true;
break;
default:
break;
}
return false;
}
// UpgradeIntrinsicFunction - Convert overloaded intrinsic function names to
// their non-overloaded variants by appending the appropriate suffix based on
// the argument types.
Function* llvm::UpgradeIntrinsicFunction(Function* F) {
// See if its one of the name's we're interested in.
if (const Type* Ty = getTypeFromFunctionName(F)) {
const char* suffix =
get_suffix((Ty->isSigned() ? Ty->getUnsignedVersion() : Ty));
assert(suffix && "Intrinsic parameter type not recognized");
const std::string& Name = F->getName();
std::string new_name = Name + suffix;
std::cerr << "WARNING: change " << Name << " to " << new_name << "\n";
SymbolTable& SymTab = F->getParent()->getSymbolTable();
if (Value* V = SymTab.lookup(F->getType(),new_name))
if (Function* OtherF = dyn_cast<Function>(V))
return OtherF;
// There wasn't an existing function for the intrinsic, so now make sure the
// signedness of the arguments is correct.
if (Ty->isSigned()) {
const Type* newTy = Ty->getUnsignedVersion();
std::vector<const Type*> Params;
Params.push_back(newTy);
FunctionType* FT = FunctionType::get(newTy, Params,false);
return new Function(FT, GlobalValue::ExternalLinkage, new_name,
F->getParent());
}
// The argument was the correct type (unsigned or floating), so just
// rename the function to its correct name and return it.
F->setName(new_name);
return F;
}
return 0;
}
Instruction* llvm::UpgradeIntrinsicCall(CallInst *CI) {
Function *F = CI->getCalledFunction();
if (const Type* Ty = getTypeFromFunctionName(F)) {
Function* newF = UpgradeIntrinsicFunction(F);
std::vector<Value*> Oprnds;
for (User::op_iterator OI = CI->op_begin(), OE = CI->op_end();
OI != OE; ++OI)
Oprnds.push_back(CI);
CallInst* newCI = new CallInst(newF,Oprnds,"autoupgrade_call",CI);
if (Ty->isSigned()) {
const Type* newTy = Ty->getUnsignedVersion();
newCI->setOperand(1,new CastInst(newCI->getOperand(1), newTy,
"autoupgrade_cast", newCI));
CastInst* final = new CastInst(newCI, Ty, "autoupgrade_uncast",newCI);
newCI->moveBefore(final);
return final;
}
return newCI;
}
return 0;
}
bool llvm::UpgradeCallsToIntrinsic(Function* F) {
if (Function* newF = UpgradeIntrinsicFunction(F)) {
for (Value::use_iterator UI = F->use_begin(), UE = F->use_end();
UI != UE; ) {
if (CallInst* CI = dyn_cast<CallInst>(*UI++)) {
std::vector<Value*> Oprnds;
User::op_iterator OI = CI->op_begin();
++OI;
for (User::op_iterator OE = CI->op_end(); OI != OE; ++OI)
Oprnds.push_back(*OI);
CallInst* newCI = new CallInst(newF,Oprnds,"autoupgrade_call",CI);
const Type* Ty = Oprnds[0]->getType();
if (Ty->isSigned()) {
const Type* newTy = Ty->getUnsignedVersion();
newCI->setOperand(1,new CastInst(newCI->getOperand(1), newTy,
"autoupgrade_cast", newCI));
CastInst* final = new CastInst(newCI, Ty, "autoupgrade_uncast",newCI);
newCI->moveBefore(final);
CI->replaceAllUsesWith(final);
} else {
CI->replaceAllUsesWith(newCI);
}
CI->eraseFromParent();
}
}
if (newF != F)
F->eraseFromParent();
return true;
}
return false;
}
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