| //===-- AutoUpgrade.cpp - Implement auto-upgrade helper functions ---------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file was developed by Chandler Carruth 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/AutoUpgrade.h" |
| #include "llvm/Constants.h" |
| #include "llvm/Function.h" |
| #include "llvm/Module.h" |
| #include "llvm/Instructions.h" |
| #include "llvm/ParameterAttributes.h" |
| #include "llvm/Intrinsics.h" |
| using namespace llvm; |
| |
| |
| static bool UpgradeIntrinsicFunction1(Function *F, Function *&NewFn) { |
| assert(F && "Illegal to upgrade a non-existent Function."); |
| |
| // Get the Function's name. |
| const std::string& Name = F->getName(); |
| |
| // Convenience |
| const FunctionType *FTy = F->getFunctionType(); |
| |
| // 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 false; |
| |
| Module *M = F->getParent(); |
| switch (Name[5]) { |
| default: break; |
| case 'b': |
| // This upgrades the name of the llvm.bswap intrinsic function to only use |
| // a single type name for overloading. We only care about the old format |
| // 'llvm.bswap.i*.i*', so check for 'bswap.' and then for there being |
| // a '.' after 'bswap.' |
| if (Name.compare(5,6,"bswap.",6) == 0) { |
| std::string::size_type delim = Name.find('.',11); |
| |
| if (delim != std::string::npos) { |
| // Construct the new name as 'llvm.bswap' + '.i*' |
| F->setName(Name.substr(0,10)+Name.substr(delim)); |
| NewFn = F; |
| return true; |
| } |
| } |
| break; |
| |
| case 'c': |
| // We only want to fix the 'llvm.ct*' intrinsics which do not have the |
| // correct return type, so we check for the name, and then check if the |
| // return type does not match the parameter type. |
| if ( (Name.compare(5,5,"ctpop",5) == 0 || |
| Name.compare(5,4,"ctlz",4) == 0 || |
| Name.compare(5,4,"cttz",4) == 0) && |
| FTy->getReturnType() != FTy->getParamType(0)) { |
| // We first need to change the name of the old (bad) intrinsic, because |
| // its type is incorrect, but we cannot overload that name. We |
| // arbitrarily unique it here allowing us to construct a correctly named |
| // and typed function below. |
| F->setName(""); |
| |
| // Now construct the new intrinsic with the correct name and type. We |
| // leave the old function around in order to query its type, whatever it |
| // may be, and correctly convert up to the new type. |
| NewFn = cast<Function>(M->getOrInsertFunction(Name, |
| FTy->getParamType(0), |
| FTy->getParamType(0), |
| (Type *)0)); |
| return true; |
| } |
| break; |
| |
| case 'p': |
| // This upgrades the llvm.part.select overloaded intrinsic names to only |
| // use one type specifier in the name. We only care about the old format |
| // 'llvm.part.select.i*.i*', and solve as above with bswap. |
| if (Name.compare(5,12,"part.select.",12) == 0) { |
| std::string::size_type delim = Name.find('.',17); |
| |
| if (delim != std::string::npos) { |
| // Construct a new name as 'llvm.part.select' + '.i*' |
| F->setName(Name.substr(0,16)+Name.substr(delim)); |
| NewFn = F; |
| return true; |
| } |
| break; |
| } |
| |
| // This upgrades the llvm.part.set intrinsics similarly as above, however |
| // we care about 'llvm.part.set.i*.i*.i*', but only the first two types |
| // must match. There is an additional type specifier after these two |
| // matching types that we must retain when upgrading. Thus, we require |
| // finding 2 periods, not just one, after the intrinsic name. |
| if (Name.compare(5,9,"part.set.",9) == 0) { |
| std::string::size_type delim = Name.find('.',14); |
| |
| if (delim != std::string::npos && |
| Name.find('.',delim+1) != std::string::npos) { |
| // Construct a new name as 'llvm.part.select' + '.i*.i*' |
| F->setName(Name.substr(0,13)+Name.substr(delim)); |
| NewFn = F; |
| return true; |
| } |
| break; |
| } |
| |
| break; |
| case 'x': |
| // This fixes all MMX shift intrinsic instructions to take a |
| // v1i64 instead of a v2i32 as the second parameter. |
| if (Name.compare(5,10,"x86.mmx.ps",10) == 0 && |
| (Name.compare(13,4,"psll", 4) == 0 || |
| Name.compare(13,4,"psra", 4) == 0 || |
| Name.compare(13,4,"psrl", 4) == 0)) { |
| |
| const llvm::Type *VT = VectorType::get(IntegerType::get(64), 1); |
| |
| // We don't have to do anything if the parameter already has |
| // the correct type. |
| if (FTy->getParamType(1) == VT) |
| break; |
| |
| // We first need to change the name of the old (bad) intrinsic, because |
| // its type is incorrect, but we cannot overload that name. We |
| // arbitrarily unique it here allowing us to construct a correctly named |
| // and typed function below. |
| F->setName(""); |
| |
| assert(FTy->getNumParams() == 2 && "MMX shift intrinsics take 2 args!"); |
| |
| // Now construct the new intrinsic with the correct name and type. We |
| // leave the old function around in order to query its type, whatever it |
| // may be, and correctly convert up to the new type. |
| NewFn = cast<Function>(M->getOrInsertFunction(Name, |
| FTy->getReturnType(), |
| FTy->getParamType(0), |
| VT, |
| (Type *)0)); |
| return true; |
| } else if (Name.compare(5,16,"x86.sse2.movl.dq",16) == 0) { |
| // Calls to this intrinsic are transformed into ShuffleVector's. |
| NewFn = 0; |
| 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 = 0; |
| bool Upgraded = UpgradeIntrinsicFunction1(F, NewFn); |
| |
| // Upgrade intrinsic attributes. This does not change the function. |
| if (NewFn) |
| F = NewFn; |
| if (unsigned id = F->getIntrinsicID(true)) |
| F->setParamAttrs(Intrinsic::getParamAttrs((Intrinsic::ID)id)); |
| return Upgraded; |
| } |
| |
| // 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(); |
| assert(F && "CallInst has no function associated with it."); |
| |
| if (!NewFn) { |
| if (strcmp(F->getNameStart(), "llvm.x86.sse2.movl.dq") == 0) { |
| std::vector<Constant*> Idxs; |
| Constant *Zero = ConstantInt::get(Type::Int32Ty, 0); |
| Idxs.push_back(Zero); |
| Idxs.push_back(Zero); |
| Idxs.push_back(Zero); |
| Idxs.push_back(Zero); |
| Value *ZeroV = ConstantVector::get(Idxs); |
| |
| Idxs.clear(); |
| Idxs.push_back(ConstantInt::get(Type::Int32Ty, 4)); |
| Idxs.push_back(ConstantInt::get(Type::Int32Ty, 5)); |
| Idxs.push_back(ConstantInt::get(Type::Int32Ty, 2)); |
| Idxs.push_back(ConstantInt::get(Type::Int32Ty, 3)); |
| Value *Mask = ConstantVector::get(Idxs); |
| ShuffleVectorInst *SI = new ShuffleVectorInst(ZeroV, CI->getOperand(1), |
| Mask, "upgraded", CI); |
| |
| // Handle any uses of the old CallInst. |
| if (!CI->use_empty()) |
| // Replace all uses of the old call with the new cast which has the |
| // correct type. |
| CI->replaceAllUsesWith(SI); |
| |
| // Clean up the old call now that it has been completely upgraded. |
| CI->eraseFromParent(); |
| } else { |
| assert(0 && "Unknown function for CallInst upgrade."); |
| } |
| return; |
| } |
| |
| switch(NewFn->getIntrinsicID()) { |
| default: assert(0 && "Unknown function for CallInst upgrade."); |
| case Intrinsic::x86_mmx_psll_d: |
| case Intrinsic::x86_mmx_psll_q: |
| case Intrinsic::x86_mmx_psll_w: |
| case Intrinsic::x86_mmx_psra_d: |
| case Intrinsic::x86_mmx_psra_w: |
| case Intrinsic::x86_mmx_psrl_d: |
| case Intrinsic::x86_mmx_psrl_q: |
| case Intrinsic::x86_mmx_psrl_w: { |
| SmallVector<Value*, 2> Operands; |
| |
| Operands.push_back(CI->getOperand(1)); |
| |
| // Cast the second parameter to the correct type. |
| BitCastInst *BC = new BitCastInst(CI->getOperand(2), |
| NewFn->getFunctionType()->getParamType(1), |
| "upgraded", CI); |
| Operands.push_back(BC); |
| |
| // Construct a new CallInst |
| CallInst *NewCI = new CallInst(NewFn, Operands.begin(), Operands.end(), |
| "upgraded."+CI->getName(), CI); |
| NewCI->setTailCall(CI->isTailCall()); |
| NewCI->setCallingConv(CI->getCallingConv()); |
| |
| // Handle any uses of the old CallInst. |
| if (!CI->use_empty()) |
| // Replace all uses of the old call with the new cast which has the |
| // correct type. |
| CI->replaceAllUsesWith(NewCI); |
| |
| // Clean up the old call now that it has been completely upgraded. |
| CI->eraseFromParent(); |
| break; |
| } |
| case Intrinsic::ctlz: |
| case Intrinsic::ctpop: |
| case Intrinsic::cttz: |
| // Build a small vector of the 1..(N-1) operands, which are the |
| // parameters. |
| SmallVector<Value*, 8> Operands(CI->op_begin()+1, CI->op_end()); |
| |
| // Construct a new CallInst |
| CallInst *NewCI = new CallInst(NewFn, Operands.begin(), Operands.end(), |
| "upgraded."+CI->getName(), CI); |
| NewCI->setTailCall(CI->isTailCall()); |
| NewCI->setCallingConv(CI->getCallingConv()); |
| |
| // Handle any uses of the old CallInst. |
| if (!CI->use_empty()) { |
| // Check for sign extend parameter attributes on the return values. |
| bool SrcSExt = NewFn->getParamAttrs() && |
| NewFn->getParamAttrs()->paramHasAttr(0,ParamAttr::SExt); |
| bool DestSExt = F->getParamAttrs() && |
| F->getParamAttrs()->paramHasAttr(0,ParamAttr::SExt); |
| |
| // Construct an appropriate cast from the new return type to the old. |
| CastInst *RetCast = CastInst::create( |
| CastInst::getCastOpcode(NewCI, SrcSExt, |
| F->getReturnType(), |
| DestSExt), |
| NewCI, F->getReturnType(), |
| NewCI->getName(), CI); |
| NewCI->moveBefore(RetCast); |
| |
| // Replace all uses of the old call with the new cast which has the |
| // correct type. |
| CI->replaceAllUsesWith(RetCast); |
| } |
| |
| // Clean up the old call now that it has been completely upgraded. |
| CI->eraseFromParent(); |
| break; |
| } |
| } |
| |
| // 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::use_iterator UI = F->use_begin(), UE = F->use_end(); |
| UI != UE; ) { |
| if (CallInst* CI = dyn_cast<CallInst>(*UI++)) |
| UpgradeIntrinsicCall(CI, NewFn); |
| } |
| // Remove old function, no longer used, from the module. |
| F->eraseFromParent(); |
| } |
| } |
| } |
| |
