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llvm/lib/VMCore/AutoUpgrade.cpp
Duncan Sands b01bbdcc1a I don't see any point in having both eh.selector.i32 and eh.selector.i64, 
so get rid of eh.selector.i64 and rename eh.selector.i32 to eh.selector.
Likewise for eh.typeid.for.  This aligns us with gcc, which always uses a
32 bit value for the selector on all platforms.  My understanding is that
the register allocator used to assert if the selector intrinsic size didn't
match the pointer size, and this was the reason for introducing the two
variants.  However my testing shows that this is no longer the case (I
fixed some bugs in selector lowering yesterday, and some more today in the
fastisel path; these might have caused the original problems).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84106 91177308-0d34-0410-b5e6-96231b3b80d8
2009-10-14 16:11:37 +00:00

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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/AutoUpgrade.h"
#include "llvm/Constants.h"
#include "llvm/Function.h"
#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/ErrorHandling.h"
#include <cstring>
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 'a':
// This upgrades the llvm.atomic.lcs, llvm.atomic.las, llvm.atomic.lss,
// and atomics with default address spaces to their new names to their new
// function name (e.g. llvm.atomic.add.i32 => llvm.atomic.add.i32.p0i32)
if (Name.compare(5,7,"atomic.",7) == 0) {
if (Name.compare(12,3,"lcs",3) == 0) {
std::string::size_type delim = Name.find('.',12);
F->setName("llvm.atomic.cmp.swap" + Name.substr(delim) +
".p0" + Name.substr(delim+1));
NewFn = F;
return true;
}
else if (Name.compare(12,3,"las",3) == 0) {
std::string::size_type delim = Name.find('.',12);
F->setName("llvm.atomic.load.add"+Name.substr(delim)
+ ".p0" + Name.substr(delim+1));
NewFn = F;
return true;
}
else if (Name.compare(12,3,"lss",3) == 0) {
std::string::size_type delim = Name.find('.',12);
F->setName("llvm.atomic.load.sub"+Name.substr(delim)
+ ".p0" + Name.substr(delim+1));
NewFn = F;
return true;
}
else if (Name.rfind(".p") == std::string::npos) {
// We don't have an address space qualifier so this has be upgraded
// to the new name. Copy the type name at the end of the intrinsic
// and add to it
std::string::size_type delim = Name.find_last_of('.');
assert(delim != std::string::npos && "can not find type");
F->setName(Name + ".p0" + Name.substr(delim+1));
NewFn = F;
return true;
}
}
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 'e':
// The old llvm.eh.selector.i32 is equivalent to the new llvm.eh.selector.
if (Name.compare("llvm.eh.selector.i32") == 0) {
F->setName("llvm.eh.selector");
NewFn = F;
return true;
}
// The old llvm.eh.typeid.for.i32 is equivalent to llvm.eh.typeid.for.
if (Name.compare("llvm.eh.typeid.for.i32") == 0) {
F->setName("llvm.eh.typeid.for");
NewFn = F;
return true;
}
// Convert the old llvm.eh.selector.i64 to a call to llvm.eh.selector.
if (Name.compare("llvm.eh.selector.i64") == 0) {
NewFn = Intrinsic::getDeclaration(M, Intrinsic::eh_selector);
return true;
}
// Convert the old llvm.eh.typeid.for.i64 to a call to llvm.eh.typeid.for.
if (Name.compare("llvm.eh.typeid.for.i64") == 0) {
NewFn = Intrinsic::getDeclaration(M, Intrinsic::eh_typeid_for);
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) && Name[17] != 'i') {
const llvm::Type *VT =
VectorType::get(IntegerType::get(FTy->getContext(), 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(5,17,"x86.sse2.loadh.pd",17) == 0 ||
Name.compare(5,17,"x86.sse2.loadl.pd",17) == 0 ||
Name.compare(5,16,"x86.sse2.movl.dq",16) == 0 ||
Name.compare(5,15,"x86.sse2.movs.d",15) == 0 ||
Name.compare(5,16,"x86.sse2.shuf.pd",16) == 0 ||
Name.compare(5,18,"x86.sse2.unpckh.pd",18) == 0 ||
Name.compare(5,18,"x86.sse2.unpckl.pd",18) == 0 ||
Name.compare(5,20,"x86.sse2.punpckh.qdq",20) == 0 ||
Name.compare(5,20,"x86.sse2.punpckl.qdq",20) == 0) {
// Calls to these intrinsics 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())
F->setAttributes(Intrinsic::getAttributes((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();
LLVMContext &C = CI->getContext();
assert(F && "CallInst has no function associated with it.");
if (!NewFn) {
bool isLoadH = false, isLoadL = false, isMovL = false;
bool isMovSD = false, isShufPD = false;
bool isUnpckhPD = false, isUnpcklPD = false;
bool isPunpckhQPD = false, isPunpcklQPD = false;
if (F->getName() == "llvm.x86.sse2.loadh.pd")
isLoadH = true;
else if (F->getName() == "llvm.x86.sse2.loadl.pd")
isLoadL = true;
else if (F->getName() == "llvm.x86.sse2.movl.dq")
isMovL = true;
else if (F->getName() == "llvm.x86.sse2.movs.d")
isMovSD = true;
else if (F->getName() == "llvm.x86.sse2.shuf.pd")
isShufPD = true;
else if (F->getName() == "llvm.x86.sse2.unpckh.pd")
isUnpckhPD = true;
else if (F->getName() == "llvm.x86.sse2.unpckl.pd")
isUnpcklPD = true;
else if (F->getName() == "llvm.x86.sse2.punpckh.qdq")
isPunpckhQPD = true;
else if (F->getName() == "llvm.x86.sse2.punpckl.qdq")
isPunpcklQPD = true;
if (isLoadH || isLoadL || isMovL || isMovSD || isShufPD ||
isUnpckhPD || isUnpcklPD || isPunpckhQPD || isPunpcklQPD) {
std::vector<Constant*> Idxs;
Value *Op0 = CI->getOperand(1);
ShuffleVectorInst *SI = NULL;
if (isLoadH || isLoadL) {
Value *Op1 = UndefValue::get(Op0->getType());
Value *Addr = new BitCastInst(CI->getOperand(2),
Type::getDoublePtrTy(C),
"upgraded.", CI);
Value *Load = new LoadInst(Addr, "upgraded.", false, 8, CI);
Value *Idx = ConstantInt::get(Type::getInt32Ty(C), 0);
Op1 = InsertElementInst::Create(Op1, Load, Idx, "upgraded.", CI);
if (isLoadH) {
Idxs.push_back(ConstantInt::get(Type::getInt32Ty(C), 0));
Idxs.push_back(ConstantInt::get(Type::getInt32Ty(C), 2));
} else {
Idxs.push_back(ConstantInt::get(Type::getInt32Ty(C), 2));
Idxs.push_back(ConstantInt::get(Type::getInt32Ty(C), 1));
}
Value *Mask = ConstantVector::get(Idxs);
SI = new ShuffleVectorInst(Op0, Op1, Mask, "upgraded.", CI);
} else if (isMovL) {
Constant *Zero = ConstantInt::get(Type::getInt32Ty(C), 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::getInt32Ty(C), 4));
Idxs.push_back(ConstantInt::get(Type::getInt32Ty(C), 5));
Idxs.push_back(ConstantInt::get(Type::getInt32Ty(C), 2));
Idxs.push_back(ConstantInt::get(Type::getInt32Ty(C), 3));
Value *Mask = ConstantVector::get(Idxs);
SI = new ShuffleVectorInst(ZeroV, Op0, Mask, "upgraded.", CI);
} else if (isMovSD ||
isUnpckhPD || isUnpcklPD || isPunpckhQPD || isPunpcklQPD) {
Value *Op1 = CI->getOperand(2);
if (isMovSD) {
Idxs.push_back(ConstantInt::get(Type::getInt32Ty(C), 2));
Idxs.push_back(ConstantInt::get(Type::getInt32Ty(C), 1));
} else if (isUnpckhPD || isPunpckhQPD) {
Idxs.push_back(ConstantInt::get(Type::getInt32Ty(C), 1));
Idxs.push_back(ConstantInt::get(Type::getInt32Ty(C), 3));
} else {
Idxs.push_back(ConstantInt::get(Type::getInt32Ty(C), 0));
Idxs.push_back(ConstantInt::get(Type::getInt32Ty(C), 2));
}
Value *Mask = ConstantVector::get(Idxs);
SI = new ShuffleVectorInst(Op0, Op1, Mask, "upgraded.", CI);
} else if (isShufPD) {
Value *Op1 = CI->getOperand(2);
unsigned MaskVal = cast<ConstantInt>(CI->getOperand(3))->getZExtValue();
Idxs.push_back(ConstantInt::get(Type::getInt32Ty(C), MaskVal & 1));
Idxs.push_back(ConstantInt::get(Type::getInt32Ty(C),
((MaskVal >> 1) & 1)+2));
Value *Mask = ConstantVector::get(Idxs);
SI = new ShuffleVectorInst(Op0, Op1, Mask, "upgraded.", CI);
}
assert(SI && "Unexpected!");
// 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 {
llvm_unreachable("Unknown function for CallInst upgrade.");
}
return;
}
switch (NewFn->getIntrinsicID()) {
default: llvm_unreachable("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: {
Value *Operands[2];
Operands[0] = 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[1] = BC;
// Construct a new CallInst
CallInst *NewCI = CallInst::Create(NewFn, Operands, Operands+2,
"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 = CallInst::Create(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->getAttributes().paramHasAttr(0, Attribute::SExt);
bool DestSExt = F->getAttributes().paramHasAttr(0, Attribute::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;
case Intrinsic::eh_selector:
case Intrinsic::eh_typeid_for: {
// Only the return type changed.
SmallVector<Value*, 8> Operands(CI->op_begin() + 1, CI->op_end());
CallInst *NewCI = CallInst::Create(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()) {
// Construct an appropriate cast from the new return type to the old.
CastInst *RetCast =
CastInst::Create(CastInst::getCastOpcode(NewCI, true,
F->getReturnType(), true),
NewCI, F->getReturnType(), NewCI->getName(), CI);
CI->replaceAllUsesWith(RetCast);
}
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();
}
}
}
/// This function checks debug info intrinsics. If an intrinsic is invalid
/// then this function simply removes the intrinsic.
void llvm::CheckDebugInfoIntrinsics(Module *M) {
if (Function *FuncStart = M->getFunction("llvm.dbg.func.start")) {
if (!FuncStart->use_empty()) {
DbgFuncStartInst *DFSI = cast<DbgFuncStartInst>(FuncStart->use_back());
if (!isa<MDNode>(DFSI->getOperand(1))) {
while (!FuncStart->use_empty()) {
CallInst *CI = cast<CallInst>(FuncStart->use_back());
CI->eraseFromParent();
}
FuncStart->eraseFromParent();
}
}
}
if (Function *StopPoint = M->getFunction("llvm.dbg.stoppoint")) {
if (!StopPoint->use_empty()) {
DbgStopPointInst *DSPI = cast<DbgStopPointInst>(StopPoint->use_back());
if (!isa<MDNode>(DSPI->getOperand(3))) {
while (!StopPoint->use_empty()) {
CallInst *CI = cast<CallInst>(StopPoint->use_back());
CI->eraseFromParent();
}
StopPoint->eraseFromParent();
}
}
}
if (Function *RegionStart = M->getFunction("llvm.dbg.region.start")) {
if (!RegionStart->use_empty()) {
DbgRegionStartInst *DRSI = cast<DbgRegionStartInst>(RegionStart->use_back());
if (!isa<MDNode>(DRSI->getOperand(1))) {
while (!RegionStart->use_empty()) {
CallInst *CI = cast<CallInst>(RegionStart->use_back());
CI->eraseFromParent();
}
RegionStart->eraseFromParent();
}
}
}
if (Function *RegionEnd = M->getFunction("llvm.dbg.region.end")) {
if (!RegionEnd->use_empty()) {
DbgRegionEndInst *DREI = cast<DbgRegionEndInst>(RegionEnd->use_back());
if (!isa<MDNode>(DREI->getOperand(1))) {
while (!RegionEnd->use_empty()) {
CallInst *CI = cast<CallInst>(RegionEnd->use_back());
CI->eraseFromParent();
}
RegionEnd->eraseFromParent();
}
}
}
if (Function *Declare = M->getFunction("llvm.dbg.declare")) {
if (!Declare->use_empty()) {
DbgDeclareInst *DDI = cast<DbgDeclareInst>(Declare->use_back());
if (!isa<MDNode>(DDI->getOperand(2))) {
while (!Declare->use_empty()) {
CallInst *CI = cast<CallInst>(Declare->use_back());
CI->eraseFromParent();
}
Declare->eraseFromParent();
}
}
}
}
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