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-rw-r--r--contrib/llvm/lib/IR/AutoUpgrade.cpp588
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diff --git a/contrib/llvm/lib/IR/AutoUpgrade.cpp b/contrib/llvm/lib/IR/AutoUpgrade.cpp
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+//===-- AutoUpgrade.cpp - Implement auto-upgrade helper functions ---------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file 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/IR/AutoUpgrade.h"
+#include "llvm/IR/CFG.h"
+#include "llvm/IR/CallSite.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/DebugInfo.h"
+#include "llvm/IR/DiagnosticInfo.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/IRBuilder.h"
+#include "llvm/IR/Instruction.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Support/ErrorHandling.h"
+#include <cstring>
+using namespace llvm;
+
+// Upgrade the declarations of the SSE4.1 functions whose arguments have
+// changed their type from v4f32 to v2i64.
+static bool UpgradeSSE41Function(Function* F, Intrinsic::ID IID,
+ Function *&NewFn) {
+ // Check whether this is an old version of the function, which received
+ // v4f32 arguments.
+ Type *Arg0Type = F->getFunctionType()->getParamType(0);
+ if (Arg0Type != VectorType::get(Type::getFloatTy(F->getContext()), 4))
+ return false;
+
+ // Yes, it's old, replace it with new version.
+ F->setName(F->getName() + ".old");
+ NewFn = Intrinsic::getDeclaration(F->getParent(), IID);
+ return true;
+}
+
+static bool UpgradeIntrinsicFunction1(Function *F, Function *&NewFn) {
+ assert(F && "Illegal to upgrade a non-existent Function.");
+
+ // Quickly eliminate it, if it's not a candidate.
+ StringRef Name = F->getName();
+ if (Name.size() <= 8 || !Name.startswith("llvm."))
+ return false;
+ Name = Name.substr(5); // Strip off "llvm."
+
+ switch (Name[0]) {
+ default: break;
+ case 'a': {
+ if (Name.startswith("arm.neon.vclz")) {
+ Type* args[2] = {
+ F->arg_begin()->getType(),
+ Type::getInt1Ty(F->getContext())
+ };
+ // Can't use Intrinsic::getDeclaration here as it adds a ".i1" to
+ // the end of the name. Change name from llvm.arm.neon.vclz.* to
+ // llvm.ctlz.*
+ FunctionType* fType = FunctionType::get(F->getReturnType(), args, false);
+ NewFn = Function::Create(fType, F->getLinkage(),
+ "llvm.ctlz." + Name.substr(14), F->getParent());
+ return true;
+ }
+ if (Name.startswith("arm.neon.vcnt")) {
+ NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::ctpop,
+ F->arg_begin()->getType());
+ return true;
+ }
+ break;
+ }
+ case 'c': {
+ if (Name.startswith("ctlz.") && F->arg_size() == 1) {
+ F->setName(Name + ".old");
+ NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::ctlz,
+ F->arg_begin()->getType());
+ return true;
+ }
+ if (Name.startswith("cttz.") && F->arg_size() == 1) {
+ F->setName(Name + ".old");
+ NewFn = Intrinsic::getDeclaration(F->getParent(), Intrinsic::cttz,
+ F->arg_begin()->getType());
+ return true;
+ }
+ break;
+ }
+ case 'o':
+ // We only need to change the name to match the mangling including the
+ // address space.
+ if (F->arg_size() == 2 && Name.startswith("objectsize.")) {
+ Type *Tys[2] = { F->getReturnType(), F->arg_begin()->getType() };
+ if (F->getName() != Intrinsic::getName(Intrinsic::objectsize, Tys)) {
+ F->setName(Name + ".old");
+ NewFn = Intrinsic::getDeclaration(F->getParent(),
+ Intrinsic::objectsize, Tys);
+ return true;
+ }
+ }
+ break;
+
+ case 'x': {
+ if (Name.startswith("x86.sse2.pcmpeq.") ||
+ Name.startswith("x86.sse2.pcmpgt.") ||
+ Name.startswith("x86.avx2.pcmpeq.") ||
+ Name.startswith("x86.avx2.pcmpgt.") ||
+ Name.startswith("x86.avx.vpermil.") ||
+ Name == "x86.avx.movnt.dq.256" ||
+ Name == "x86.avx.movnt.pd.256" ||
+ Name == "x86.avx.movnt.ps.256" ||
+ Name == "x86.sse42.crc32.64.8" ||
+ Name == "x86.avx.vbroadcast.ss" ||
+ Name == "x86.avx.vbroadcast.ss.256" ||
+ Name == "x86.avx.vbroadcast.sd.256" ||
+ (Name.startswith("x86.xop.vpcom") && F->arg_size() == 2)) {
+ NewFn = nullptr;
+ return true;
+ }
+ // SSE4.1 ptest functions may have an old signature.
+ if (Name.startswith("x86.sse41.ptest")) {
+ if (Name == "x86.sse41.ptestc")
+ return UpgradeSSE41Function(F, Intrinsic::x86_sse41_ptestc, NewFn);
+ if (Name == "x86.sse41.ptestz")
+ return UpgradeSSE41Function(F, Intrinsic::x86_sse41_ptestz, NewFn);
+ if (Name == "x86.sse41.ptestnzc")
+ return UpgradeSSE41Function(F, Intrinsic::x86_sse41_ptestnzc, NewFn);
+ }
+ // frcz.ss/sd may need to have an argument dropped
+ if (Name.startswith("x86.xop.vfrcz.ss") && F->arg_size() == 2) {
+ F->setName(Name + ".old");
+ NewFn = Intrinsic::getDeclaration(F->getParent(),
+ Intrinsic::x86_xop_vfrcz_ss);
+ return true;
+ }
+ if (Name.startswith("x86.xop.vfrcz.sd") && F->arg_size() == 2) {
+ F->setName(Name + ".old");
+ NewFn = Intrinsic::getDeclaration(F->getParent(),
+ Intrinsic::x86_xop_vfrcz_sd);
+ return true;
+ }
+ // Fix the FMA4 intrinsics to remove the 4
+ if (Name.startswith("x86.fma4.")) {
+ F->setName("llvm.x86.fma" + Name.substr(8));
+ NewFn = F;
+ return true;
+ }
+ break;
+ }
+ }
+
+ // This may not belong here. This function is effectively being overloaded
+ // to both detect an intrinsic which needs upgrading, and to provide the
+ // upgraded form of the intrinsic. We should perhaps have two separate
+ // functions for this.
+ return false;
+}
+
+bool llvm::UpgradeIntrinsicFunction(Function *F, Function *&NewFn) {
+ NewFn = nullptr;
+ bool Upgraded = UpgradeIntrinsicFunction1(F, NewFn);
+
+ // Upgrade intrinsic attributes. This does not change the function.
+ if (NewFn)
+ F = NewFn;
+ if (unsigned id = F->getIntrinsicID())
+ F->setAttributes(Intrinsic::getAttributes(F->getContext(),
+ (Intrinsic::ID)id));
+ return Upgraded;
+}
+
+static bool UpgradeGlobalStructors(GlobalVariable *GV) {
+ ArrayType *ATy = dyn_cast<ArrayType>(GV->getType()->getElementType());
+ StructType *OldTy =
+ ATy ? dyn_cast<StructType>(ATy->getElementType()) : nullptr;
+
+ // Only upgrade an array of a two field struct with the appropriate field
+ // types.
+ if (!OldTy || OldTy->getNumElements() != 2)
+ return false;
+
+ // Get the upgraded 3 element type.
+ PointerType *VoidPtrTy = Type::getInt8Ty(GV->getContext())->getPointerTo();
+ Type *Tys[3] = {
+ OldTy->getElementType(0),
+ OldTy->getElementType(1),
+ VoidPtrTy
+ };
+ StructType *NewTy =
+ StructType::get(GV->getContext(), Tys, /*isPacked=*/false);
+
+ // Build new constants with a null third field filled in.
+ Constant *OldInitC = GV->getInitializer();
+ ConstantArray *OldInit = dyn_cast<ConstantArray>(OldInitC);
+ if (!OldInit && !isa<ConstantAggregateZero>(OldInitC))
+ return false;
+ std::vector<Constant *> Initializers;
+ if (OldInit) {
+ for (Use &U : OldInit->operands()) {
+ ConstantStruct *Init = cast<ConstantStruct>(&U);
+ Constant *NewInit =
+ ConstantStruct::get(NewTy, Init->getOperand(0), Init->getOperand(1),
+ Constant::getNullValue(VoidPtrTy), nullptr);
+ Initializers.push_back(NewInit);
+ }
+ }
+ assert(Initializers.size() == ATy->getNumElements());
+
+ // Replace the old GV with a new one.
+ ATy = ArrayType::get(NewTy, Initializers.size());
+ Constant *NewInit = ConstantArray::get(ATy, Initializers);
+ GlobalVariable *NewGV = new GlobalVariable(
+ *GV->getParent(), ATy, GV->isConstant(), GV->getLinkage(), NewInit, "",
+ GV, GV->getThreadLocalMode(), GV->getType()->getAddressSpace(),
+ GV->isExternallyInitialized());
+ NewGV->copyAttributesFrom(GV);
+ NewGV->takeName(GV);
+ assert(GV->use_empty() && "program cannot use initializer list");
+ GV->eraseFromParent();
+ return true;
+}
+
+bool llvm::UpgradeGlobalVariable(GlobalVariable *GV) {
+ if (GV->getName() == "llvm.global_ctors" ||
+ GV->getName() == "llvm.global_dtors")
+ return UpgradeGlobalStructors(GV);
+
+ // Nothing to do yet.
+ return false;
+}
+
+// UpgradeIntrinsicCall - Upgrade a call to an old intrinsic to be a call the
+// upgraded intrinsic. All argument and return casting must be provided in
+// order to seamlessly integrate with existing context.
+void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
+ Function *F = CI->getCalledFunction();
+ LLVMContext &C = CI->getContext();
+ IRBuilder<> Builder(C);
+ Builder.SetInsertPoint(CI->getParent(), CI);
+
+ assert(F && "Intrinsic call is not direct?");
+
+ if (!NewFn) {
+ // Get the Function's name.
+ StringRef Name = F->getName();
+
+ Value *Rep;
+ // Upgrade packed integer vector compares intrinsics to compare instructions
+ if (Name.startswith("llvm.x86.sse2.pcmpeq.") ||
+ Name.startswith("llvm.x86.avx2.pcmpeq.")) {
+ Rep = Builder.CreateICmpEQ(CI->getArgOperand(0), CI->getArgOperand(1),
+ "pcmpeq");
+ // need to sign extend since icmp returns vector of i1
+ Rep = Builder.CreateSExt(Rep, CI->getType(), "");
+ } else if (Name.startswith("llvm.x86.sse2.pcmpgt.") ||
+ Name.startswith("llvm.x86.avx2.pcmpgt.")) {
+ Rep = Builder.CreateICmpSGT(CI->getArgOperand(0), CI->getArgOperand(1),
+ "pcmpgt");
+ // need to sign extend since icmp returns vector of i1
+ Rep = Builder.CreateSExt(Rep, CI->getType(), "");
+ } else if (Name == "llvm.x86.avx.movnt.dq.256" ||
+ Name == "llvm.x86.avx.movnt.ps.256" ||
+ Name == "llvm.x86.avx.movnt.pd.256") {
+ IRBuilder<> Builder(C);
+ Builder.SetInsertPoint(CI->getParent(), CI);
+
+ Module *M = F->getParent();
+ SmallVector<Value *, 1> Elts;
+ Elts.push_back(ConstantInt::get(Type::getInt32Ty(C), 1));
+ MDNode *Node = MDNode::get(C, Elts);
+
+ Value *Arg0 = CI->getArgOperand(0);
+ Value *Arg1 = CI->getArgOperand(1);
+
+ // Convert the type of the pointer to a pointer to the stored type.
+ Value *BC = Builder.CreateBitCast(Arg0,
+ PointerType::getUnqual(Arg1->getType()),
+ "cast");
+ StoreInst *SI = Builder.CreateStore(Arg1, BC);
+ SI->setMetadata(M->getMDKindID("nontemporal"), Node);
+ SI->setAlignment(16);
+
+ // Remove intrinsic.
+ CI->eraseFromParent();
+ return;
+ } else if (Name.startswith("llvm.x86.xop.vpcom")) {
+ Intrinsic::ID intID;
+ if (Name.endswith("ub"))
+ intID = Intrinsic::x86_xop_vpcomub;
+ else if (Name.endswith("uw"))
+ intID = Intrinsic::x86_xop_vpcomuw;
+ else if (Name.endswith("ud"))
+ intID = Intrinsic::x86_xop_vpcomud;
+ else if (Name.endswith("uq"))
+ intID = Intrinsic::x86_xop_vpcomuq;
+ else if (Name.endswith("b"))
+ intID = Intrinsic::x86_xop_vpcomb;
+ else if (Name.endswith("w"))
+ intID = Intrinsic::x86_xop_vpcomw;
+ else if (Name.endswith("d"))
+ intID = Intrinsic::x86_xop_vpcomd;
+ else if (Name.endswith("q"))
+ intID = Intrinsic::x86_xop_vpcomq;
+ else
+ llvm_unreachable("Unknown suffix");
+
+ Name = Name.substr(18); // strip off "llvm.x86.xop.vpcom"
+ unsigned Imm;
+ if (Name.startswith("lt"))
+ Imm = 0;
+ else if (Name.startswith("le"))
+ Imm = 1;
+ else if (Name.startswith("gt"))
+ Imm = 2;
+ else if (Name.startswith("ge"))
+ Imm = 3;
+ else if (Name.startswith("eq"))
+ Imm = 4;
+ else if (Name.startswith("ne"))
+ Imm = 5;
+ else if (Name.startswith("true"))
+ Imm = 6;
+ else if (Name.startswith("false"))
+ Imm = 7;
+ else
+ llvm_unreachable("Unknown condition");
+
+ Function *VPCOM = Intrinsic::getDeclaration(F->getParent(), intID);
+ Rep = Builder.CreateCall3(VPCOM, CI->getArgOperand(0),
+ CI->getArgOperand(1), Builder.getInt8(Imm));
+ } else if (Name == "llvm.x86.sse42.crc32.64.8") {
+ Function *CRC32 = Intrinsic::getDeclaration(F->getParent(),
+ Intrinsic::x86_sse42_crc32_32_8);
+ Value *Trunc0 = Builder.CreateTrunc(CI->getArgOperand(0), Type::getInt32Ty(C));
+ Rep = Builder.CreateCall2(CRC32, Trunc0, CI->getArgOperand(1));
+ Rep = Builder.CreateZExt(Rep, CI->getType(), "");
+ } else if (Name.startswith("llvm.x86.avx.vbroadcast")) {
+ // Replace broadcasts with a series of insertelements.
+ Type *VecTy = CI->getType();
+ Type *EltTy = VecTy->getVectorElementType();
+ unsigned EltNum = VecTy->getVectorNumElements();
+ Value *Cast = Builder.CreateBitCast(CI->getArgOperand(0),
+ EltTy->getPointerTo());
+ Value *Load = Builder.CreateLoad(Cast);
+ Type *I32Ty = Type::getInt32Ty(C);
+ Rep = UndefValue::get(VecTy);
+ for (unsigned I = 0; I < EltNum; ++I)
+ Rep = Builder.CreateInsertElement(Rep, Load,
+ ConstantInt::get(I32Ty, I));
+ } else {
+ bool PD128 = false, PD256 = false, PS128 = false, PS256 = false;
+ if (Name == "llvm.x86.avx.vpermil.pd.256")
+ PD256 = true;
+ else if (Name == "llvm.x86.avx.vpermil.pd")
+ PD128 = true;
+ else if (Name == "llvm.x86.avx.vpermil.ps.256")
+ PS256 = true;
+ else if (Name == "llvm.x86.avx.vpermil.ps")
+ PS128 = true;
+
+ if (PD256 || PD128 || PS256 || PS128) {
+ Value *Op0 = CI->getArgOperand(0);
+ unsigned Imm = cast<ConstantInt>(CI->getArgOperand(1))->getZExtValue();
+ SmallVector<Constant*, 8> Idxs;
+
+ if (PD128)
+ for (unsigned i = 0; i != 2; ++i)
+ Idxs.push_back(Builder.getInt32((Imm >> i) & 0x1));
+ else if (PD256)
+ for (unsigned l = 0; l != 4; l+=2)
+ for (unsigned i = 0; i != 2; ++i)
+ Idxs.push_back(Builder.getInt32(((Imm >> (l+i)) & 0x1) + l));
+ else if (PS128)
+ for (unsigned i = 0; i != 4; ++i)
+ Idxs.push_back(Builder.getInt32((Imm >> (2 * i)) & 0x3));
+ else if (PS256)
+ for (unsigned l = 0; l != 8; l+=4)
+ for (unsigned i = 0; i != 4; ++i)
+ Idxs.push_back(Builder.getInt32(((Imm >> (2 * i)) & 0x3) + l));
+ else
+ llvm_unreachable("Unexpected function");
+
+ Rep = Builder.CreateShuffleVector(Op0, Op0, ConstantVector::get(Idxs));
+ } else {
+ llvm_unreachable("Unknown function for CallInst upgrade.");
+ }
+ }
+
+ CI->replaceAllUsesWith(Rep);
+ CI->eraseFromParent();
+ return;
+ }
+
+ std::string Name = CI->getName().str();
+ CI->setName(Name + ".old");
+
+ switch (NewFn->getIntrinsicID()) {
+ default:
+ llvm_unreachable("Unknown function for CallInst upgrade.");
+
+ case Intrinsic::ctlz:
+ case Intrinsic::cttz:
+ assert(CI->getNumArgOperands() == 1 &&
+ "Mismatch between function args and call args");
+ CI->replaceAllUsesWith(Builder.CreateCall2(NewFn, CI->getArgOperand(0),
+ Builder.getFalse(), Name));
+ CI->eraseFromParent();
+ return;
+
+ case Intrinsic::objectsize:
+ CI->replaceAllUsesWith(Builder.CreateCall2(NewFn,
+ CI->getArgOperand(0),
+ CI->getArgOperand(1),
+ Name));
+ CI->eraseFromParent();
+ return;
+
+ case Intrinsic::arm_neon_vclz: {
+ // Change name from llvm.arm.neon.vclz.* to llvm.ctlz.*
+ CI->replaceAllUsesWith(Builder.CreateCall2(NewFn, CI->getArgOperand(0),
+ Builder.getFalse(),
+ "llvm.ctlz." + Name.substr(14)));
+ CI->eraseFromParent();
+ return;
+ }
+ case Intrinsic::ctpop: {
+ CI->replaceAllUsesWith(Builder.CreateCall(NewFn, CI->getArgOperand(0)));
+ CI->eraseFromParent();
+ return;
+ }
+
+ case Intrinsic::x86_xop_vfrcz_ss:
+ case Intrinsic::x86_xop_vfrcz_sd:
+ CI->replaceAllUsesWith(Builder.CreateCall(NewFn, CI->getArgOperand(1),
+ Name));
+ CI->eraseFromParent();
+ return;
+
+ case Intrinsic::x86_sse41_ptestc:
+ case Intrinsic::x86_sse41_ptestz:
+ case Intrinsic::x86_sse41_ptestnzc: {
+ // The arguments for these intrinsics used to be v4f32, and changed
+ // to v2i64. This is purely a nop, since those are bitwise intrinsics.
+ // So, the only thing required is a bitcast for both arguments.
+ // First, check the arguments have the old type.
+ Value *Arg0 = CI->getArgOperand(0);
+ if (Arg0->getType() != VectorType::get(Type::getFloatTy(C), 4))
+ return;
+
+ // Old intrinsic, add bitcasts
+ Value *Arg1 = CI->getArgOperand(1);
+
+ Value *BC0 =
+ Builder.CreateBitCast(Arg0,
+ VectorType::get(Type::getInt64Ty(C), 2),
+ "cast");
+ Value *BC1 =
+ Builder.CreateBitCast(Arg1,
+ VectorType::get(Type::getInt64Ty(C), 2),
+ "cast");
+
+ CallInst* NewCall = Builder.CreateCall2(NewFn, BC0, BC1, Name);
+ CI->replaceAllUsesWith(NewCall);
+ CI->eraseFromParent();
+ return;
+ }
+ }
+}
+
+// This tests each Function to determine if it needs upgrading. When we find
+// one we are interested in, we then upgrade all calls to reflect the new
+// function.
+void llvm::UpgradeCallsToIntrinsic(Function* F) {
+ assert(F && "Illegal attempt to upgrade a non-existent intrinsic.");
+
+ // Upgrade the function and check if it is a totaly new function.
+ Function *NewFn;
+ if (UpgradeIntrinsicFunction(F, NewFn)) {
+ if (NewFn != F) {
+ // Replace all uses to the old function with the new one if necessary.
+ for (Value::user_iterator UI = F->user_begin(), UE = F->user_end();
+ UI != UE; ) {
+ if (CallInst *CI = dyn_cast<CallInst>(*UI++))
+ UpgradeIntrinsicCall(CI, NewFn);
+ }
+ // Remove old function, no longer used, from the module.
+ F->eraseFromParent();
+ }
+ }
+}
+
+void llvm::UpgradeInstWithTBAATag(Instruction *I) {
+ MDNode *MD = I->getMetadata(LLVMContext::MD_tbaa);
+ assert(MD && "UpgradeInstWithTBAATag should have a TBAA tag");
+ // Check if the tag uses struct-path aware TBAA format.
+ if (isa<MDNode>(MD->getOperand(0)) && MD->getNumOperands() >= 3)
+ return;
+
+ if (MD->getNumOperands() == 3) {
+ Value *Elts[] = {
+ MD->getOperand(0),
+ MD->getOperand(1)
+ };
+ MDNode *ScalarType = MDNode::get(I->getContext(), Elts);
+ // Create a MDNode <ScalarType, ScalarType, offset 0, const>
+ Value *Elts2[] = {
+ ScalarType, ScalarType,
+ Constant::getNullValue(Type::getInt64Ty(I->getContext())),
+ MD->getOperand(2)
+ };
+ I->setMetadata(LLVMContext::MD_tbaa, MDNode::get(I->getContext(), Elts2));
+ } else {
+ // Create a MDNode <MD, MD, offset 0>
+ Value *Elts[] = {MD, MD,
+ Constant::getNullValue(Type::getInt64Ty(I->getContext()))};
+ I->setMetadata(LLVMContext::MD_tbaa, MDNode::get(I->getContext(), Elts));
+ }
+}
+
+Instruction *llvm::UpgradeBitCastInst(unsigned Opc, Value *V, Type *DestTy,
+ Instruction *&Temp) {
+ if (Opc != Instruction::BitCast)
+ return nullptr;
+
+ Temp = nullptr;
+ Type *SrcTy = V->getType();
+ if (SrcTy->isPtrOrPtrVectorTy() && DestTy->isPtrOrPtrVectorTy() &&
+ SrcTy->getPointerAddressSpace() != DestTy->getPointerAddressSpace()) {
+ LLVMContext &Context = V->getContext();
+
+ // We have no information about target data layout, so we assume that
+ // the maximum pointer size is 64bit.
+ Type *MidTy = Type::getInt64Ty(Context);
+ Temp = CastInst::Create(Instruction::PtrToInt, V, MidTy);
+
+ return CastInst::Create(Instruction::IntToPtr, Temp, DestTy);
+ }
+
+ return nullptr;
+}
+
+Value *llvm::UpgradeBitCastExpr(unsigned Opc, Constant *C, Type *DestTy) {
+ if (Opc != Instruction::BitCast)
+ return nullptr;
+
+ Type *SrcTy = C->getType();
+ if (SrcTy->isPtrOrPtrVectorTy() && DestTy->isPtrOrPtrVectorTy() &&
+ SrcTy->getPointerAddressSpace() != DestTy->getPointerAddressSpace()) {
+ LLVMContext &Context = C->getContext();
+
+ // We have no information about target data layout, so we assume that
+ // the maximum pointer size is 64bit.
+ Type *MidTy = Type::getInt64Ty(Context);
+
+ return ConstantExpr::getIntToPtr(ConstantExpr::getPtrToInt(C, MidTy),
+ DestTy);
+ }
+
+ return nullptr;
+}
+
+/// Check the debug info version number, if it is out-dated, drop the debug
+/// info. Return true if module is modified.
+bool llvm::UpgradeDebugInfo(Module &M) {
+ unsigned Version = getDebugMetadataVersionFromModule(M);
+ if (Version == DEBUG_METADATA_VERSION)
+ return false;
+
+ bool RetCode = StripDebugInfo(M);
+ if (RetCode) {
+ DiagnosticInfoDebugMetadataVersion DiagVersion(M, Version);
+ M.getContext().diagnose(DiagVersion);
+ }
+ return RetCode;
+}
+
+void llvm::UpgradeMDStringConstant(std::string &String) {
+ const std::string OldPrefix = "llvm.vectorizer.";
+ if (String == "llvm.vectorizer.unroll") {
+ String = "llvm.loop.interleave.count";
+ } else if (String.find(OldPrefix) == 0) {
+ String.replace(0, OldPrefix.size(), "llvm.loop.vectorize.");
+ }
+}
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