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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51200 91177308-0d34-0410-b5e6-96231b3b80d8
317 lines
12 KiB
C++
317 lines
12 KiB
C++
//===-- AutoUpgrade.cpp - Implement auto-upgrade helper functions ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the auto-upgrade helper functions
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/AutoUpgrade.h"
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#include "llvm/Constants.h"
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#include "llvm/Function.h"
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#include "llvm/Module.h"
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#include "llvm/Instructions.h"
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#include "llvm/Intrinsics.h"
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#include "llvm/ADT/SmallVector.h"
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#include <cstring>
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using namespace llvm;
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static bool UpgradeIntrinsicFunction1(Function *F, Function *&NewFn) {
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assert(F && "Illegal to upgrade a non-existent Function.");
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// Get the Function's name.
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const std::string& Name = F->getName();
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// Convenience
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const FunctionType *FTy = F->getFunctionType();
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// Quickly eliminate it, if it's not a candidate.
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if (Name.length() <= 8 || Name[0] != 'l' || Name[1] != 'l' ||
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Name[2] != 'v' || Name[3] != 'm' || Name[4] != '.')
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return false;
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Module *M = F->getParent();
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switch (Name[5]) {
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default: break;
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case 'b':
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// This upgrades the name of the llvm.bswap intrinsic function to only use
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// a single type name for overloading. We only care about the old format
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// 'llvm.bswap.i*.i*', so check for 'bswap.' and then for there being
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// a '.' after 'bswap.'
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if (Name.compare(5,6,"bswap.",6) == 0) {
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std::string::size_type delim = Name.find('.',11);
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if (delim != std::string::npos) {
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// Construct the new name as 'llvm.bswap' + '.i*'
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F->setName(Name.substr(0,10)+Name.substr(delim));
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NewFn = F;
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return true;
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}
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}
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break;
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case 'c':
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// We only want to fix the 'llvm.ct*' intrinsics which do not have the
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// correct return type, so we check for the name, and then check if the
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// return type does not match the parameter type.
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if ( (Name.compare(5,5,"ctpop",5) == 0 ||
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Name.compare(5,4,"ctlz",4) == 0 ||
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Name.compare(5,4,"cttz",4) == 0) &&
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FTy->getReturnType() != FTy->getParamType(0)) {
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// We first need to change the name of the old (bad) intrinsic, because
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// its type is incorrect, but we cannot overload that name. We
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// arbitrarily unique it here allowing us to construct a correctly named
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// and typed function below.
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F->setName("");
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// Now construct the new intrinsic with the correct name and type. We
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// leave the old function around in order to query its type, whatever it
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// may be, and correctly convert up to the new type.
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NewFn = cast<Function>(M->getOrInsertFunction(Name,
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FTy->getParamType(0),
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FTy->getParamType(0),
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(Type *)0));
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return true;
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}
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break;
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case 'p':
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// This upgrades the llvm.part.select overloaded intrinsic names to only
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// use one type specifier in the name. We only care about the old format
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// 'llvm.part.select.i*.i*', and solve as above with bswap.
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if (Name.compare(5,12,"part.select.",12) == 0) {
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std::string::size_type delim = Name.find('.',17);
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if (delim != std::string::npos) {
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// Construct a new name as 'llvm.part.select' + '.i*'
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F->setName(Name.substr(0,16)+Name.substr(delim));
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NewFn = F;
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return true;
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}
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break;
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}
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// This upgrades the llvm.part.set intrinsics similarly as above, however
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// we care about 'llvm.part.set.i*.i*.i*', but only the first two types
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// must match. There is an additional type specifier after these two
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// matching types that we must retain when upgrading. Thus, we require
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// finding 2 periods, not just one, after the intrinsic name.
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if (Name.compare(5,9,"part.set.",9) == 0) {
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std::string::size_type delim = Name.find('.',14);
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if (delim != std::string::npos &&
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Name.find('.',delim+1) != std::string::npos) {
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// Construct a new name as 'llvm.part.select' + '.i*.i*'
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F->setName(Name.substr(0,13)+Name.substr(delim));
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NewFn = F;
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return true;
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}
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break;
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}
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break;
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case 'x':
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// This fixes all MMX shift intrinsic instructions to take a
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// v1i64 instead of a v2i32 as the second parameter.
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if (Name.compare(5,10,"x86.mmx.ps",10) == 0 &&
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(Name.compare(13,4,"psll", 4) == 0 ||
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Name.compare(13,4,"psra", 4) == 0 ||
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Name.compare(13,4,"psrl", 4) == 0) && Name[17] != 'i') {
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const llvm::Type *VT = VectorType::get(IntegerType::get(64), 1);
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// We don't have to do anything if the parameter already has
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// the correct type.
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if (FTy->getParamType(1) == VT)
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break;
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// We first need to change the name of the old (bad) intrinsic, because
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// its type is incorrect, but we cannot overload that name. We
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// arbitrarily unique it here allowing us to construct a correctly named
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// and typed function below.
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F->setName("");
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assert(FTy->getNumParams() == 2 && "MMX shift intrinsics take 2 args!");
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// Now construct the new intrinsic with the correct name and type. We
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// leave the old function around in order to query its type, whatever it
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// may be, and correctly convert up to the new type.
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NewFn = cast<Function>(M->getOrInsertFunction(Name,
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FTy->getReturnType(),
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FTy->getParamType(0),
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VT,
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(Type *)0));
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return true;
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} else if (Name.compare(5,16,"x86.sse2.movl.dq",16) == 0) {
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// Calls to this intrinsic are transformed into ShuffleVector's.
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NewFn = 0;
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return true;
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}
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break;
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}
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// This may not belong here. This function is effectively being overloaded
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// to both detect an intrinsic which needs upgrading, and to provide the
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// upgraded form of the intrinsic. We should perhaps have two separate
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// functions for this.
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return false;
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}
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bool llvm::UpgradeIntrinsicFunction(Function *F, Function *&NewFn) {
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NewFn = 0;
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bool Upgraded = UpgradeIntrinsicFunction1(F, NewFn);
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// Upgrade intrinsic attributes. This does not change the function.
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if (NewFn)
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F = NewFn;
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if (unsigned id = F->getIntrinsicID(true))
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F->setParamAttrs(Intrinsic::getParamAttrs((Intrinsic::ID)id));
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return Upgraded;
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}
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// UpgradeIntrinsicCall - Upgrade a call to an old intrinsic to be a call the
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// upgraded intrinsic. All argument and return casting must be provided in
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// order to seamlessly integrate with existing context.
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void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
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Function *F = CI->getCalledFunction();
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assert(F && "CallInst has no function associated with it.");
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if (!NewFn) {
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if (strcmp(F->getNameStart(), "llvm.x86.sse2.movl.dq") == 0) {
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std::vector<Constant*> Idxs;
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Constant *Zero = ConstantInt::get(Type::Int32Ty, 0);
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Idxs.push_back(Zero);
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Idxs.push_back(Zero);
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Idxs.push_back(Zero);
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Idxs.push_back(Zero);
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Value *ZeroV = ConstantVector::get(Idxs);
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Idxs.clear();
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Idxs.push_back(ConstantInt::get(Type::Int32Ty, 4));
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Idxs.push_back(ConstantInt::get(Type::Int32Ty, 5));
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Idxs.push_back(ConstantInt::get(Type::Int32Ty, 2));
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Idxs.push_back(ConstantInt::get(Type::Int32Ty, 3));
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Value *Mask = ConstantVector::get(Idxs);
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ShuffleVectorInst *SI = new ShuffleVectorInst(ZeroV, CI->getOperand(1),
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Mask, "upgraded", CI);
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// Handle any uses of the old CallInst.
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if (!CI->use_empty())
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// Replace all uses of the old call with the new cast which has the
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// correct type.
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CI->replaceAllUsesWith(SI);
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// Clean up the old call now that it has been completely upgraded.
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CI->eraseFromParent();
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} else {
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assert(0 && "Unknown function for CallInst upgrade.");
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}
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return;
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}
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switch (NewFn->getIntrinsicID()) {
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default: assert(0 && "Unknown function for CallInst upgrade.");
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case Intrinsic::x86_mmx_psll_d:
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case Intrinsic::x86_mmx_psll_q:
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case Intrinsic::x86_mmx_psll_w:
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case Intrinsic::x86_mmx_psra_d:
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case Intrinsic::x86_mmx_psra_w:
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case Intrinsic::x86_mmx_psrl_d:
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case Intrinsic::x86_mmx_psrl_q:
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case Intrinsic::x86_mmx_psrl_w: {
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Value *Operands[2];
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Operands[0] = CI->getOperand(1);
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// Cast the second parameter to the correct type.
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BitCastInst *BC = new BitCastInst(CI->getOperand(2),
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NewFn->getFunctionType()->getParamType(1),
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"upgraded", CI);
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Operands[1] = BC;
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// Construct a new CallInst
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CallInst *NewCI = CallInst::Create(NewFn, Operands, Operands+2,
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"upgraded."+CI->getName(), CI);
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NewCI->setTailCall(CI->isTailCall());
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NewCI->setCallingConv(CI->getCallingConv());
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// Handle any uses of the old CallInst.
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if (!CI->use_empty())
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// Replace all uses of the old call with the new cast which has the
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// correct type.
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CI->replaceAllUsesWith(NewCI);
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// Clean up the old call now that it has been completely upgraded.
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CI->eraseFromParent();
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break;
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}
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case Intrinsic::ctlz:
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case Intrinsic::ctpop:
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case Intrinsic::cttz: {
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// Build a small vector of the 1..(N-1) operands, which are the
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// parameters.
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SmallVector<Value*, 8> Operands(CI->op_begin()+1, CI->op_end());
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// Construct a new CallInst
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CallInst *NewCI = CallInst::Create(NewFn, Operands.begin(), Operands.end(),
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"upgraded."+CI->getName(), CI);
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NewCI->setTailCall(CI->isTailCall());
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NewCI->setCallingConv(CI->getCallingConv());
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// Handle any uses of the old CallInst.
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if (!CI->use_empty()) {
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// Check for sign extend parameter attributes on the return values.
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bool SrcSExt = NewFn->getParamAttrs().paramHasAttr(0, ParamAttr::SExt);
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bool DestSExt = F->getParamAttrs().paramHasAttr(0, ParamAttr::SExt);
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// Construct an appropriate cast from the new return type to the old.
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CastInst *RetCast = CastInst::Create(
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CastInst::getCastOpcode(NewCI, SrcSExt,
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F->getReturnType(),
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DestSExt),
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NewCI, F->getReturnType(),
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NewCI->getName(), CI);
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NewCI->moveBefore(RetCast);
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// Replace all uses of the old call with the new cast which has the
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// correct type.
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CI->replaceAllUsesWith(RetCast);
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}
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// Clean up the old call now that it has been completely upgraded.
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CI->eraseFromParent();
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}
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break;
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}
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}
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// This tests each Function to determine if it needs upgrading. When we find
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// one we are interested in, we then upgrade all calls to reflect the new
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// function.
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void llvm::UpgradeCallsToIntrinsic(Function* F) {
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assert(F && "Illegal attempt to upgrade a non-existent intrinsic.");
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// Upgrade the function and check if it is a totaly new function.
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Function* NewFn;
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if (UpgradeIntrinsicFunction(F, NewFn)) {
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if (NewFn != F) {
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// Replace all uses to the old function with the new one if necessary.
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for (Value::use_iterator UI = F->use_begin(), UE = F->use_end();
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UI != UE; ) {
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if (CallInst* CI = dyn_cast<CallInst>(*UI++))
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UpgradeIntrinsicCall(CI, NewFn);
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}
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// Remove old function, no longer used, from the module.
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F->eraseFromParent();
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}
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}
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}
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