#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
+#include "llvm/Support/MathExtras.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
bool OptimizeGlobalCtorsList(GlobalVariable *&GCL);
bool ProcessInternalGlobal(GlobalVariable *GV,Module::global_iterator &GVI);
};
-
- char GlobalOpt::ID = 0;
- RegisterPass<GlobalOpt> X("globalopt", "Global Variable Optimizer");
}
+char GlobalOpt::ID = 0;
+static RegisterPass<GlobalOpt> X("globalopt", "Global Variable Optimizer");
+
ModulePass *llvm::createGlobalOptimizerPass() { return new GlobalOpt(); }
+namespace {
+
/// GlobalStatus - As we analyze each global, keep track of some information
/// about it. If we find out that the address of the global is taken, none of
/// this info will be accurate.
HasNonInstructionUser(false), HasPHIUser(false) {}
};
-
+}
/// ConstantIsDead - Return true if the specified constant is (transitively)
/// dead. The constant may be used by other constants (e.g. constant arrays and
/// behavior of the program in a more fine-grained way. We have determined that
/// this transformation is safe already. We return the first global variable we
/// insert so that the caller can reprocess it.
-static GlobalVariable *SRAGlobal(GlobalVariable *GV) {
+static GlobalVariable *SRAGlobal(GlobalVariable *GV, const TargetData &TD) {
// Make sure this global only has simple uses that we can SRA.
if (!GlobalUsersSafeToSRA(GV))
return 0;
std::vector<GlobalVariable*> NewGlobals;
Module::GlobalListType &Globals = GV->getParent()->getGlobalList();
+ // Get the alignment of the global, either explicit or target-specific.
+ unsigned StartAlignment = GV->getAlignment();
+ if (StartAlignment == 0)
+ StartAlignment = TD.getABITypeAlignment(GV->getType());
+
if (const StructType *STy = dyn_cast<StructType>(Ty)) {
NewGlobals.reserve(STy->getNumElements());
+ const StructLayout &Layout = *TD.getStructLayout(STy);
for (unsigned i = 0, e = STy->getNumElements(); i != e; ++i) {
Constant *In = getAggregateConstantElement(Init,
ConstantInt::get(Type::Int32Ty, i));
GV->isThreadLocal());
Globals.insert(GV, NGV);
NewGlobals.push_back(NGV);
+
+ // Calculate the known alignment of the field. If the original aggregate
+ // had 256 byte alignment for example, something might depend on that:
+ // propagate info to each field.
+ uint64_t FieldOffset = Layout.getElementOffset(i);
+ unsigned NewAlign = (unsigned)MinAlign(StartAlignment, FieldOffset);
+ if (NewAlign > TD.getABITypeAlignment(STy->getElementType(i)))
+ NGV->setAlignment(NewAlign);
}
} else if (const SequentialType *STy = dyn_cast<SequentialType>(Ty)) {
unsigned NumElements = 0;
if (const ArrayType *ATy = dyn_cast<ArrayType>(STy))
NumElements = ATy->getNumElements();
- else if (const VectorType *PTy = dyn_cast<VectorType>(STy))
- NumElements = PTy->getNumElements();
else
- assert(0 && "Unknown aggregate sequential type!");
+ NumElements = cast<VectorType>(STy)->getNumElements();
if (NumElements > 16 && GV->hasNUsesOrMore(16))
return 0; // It's not worth it.
NewGlobals.reserve(NumElements);
+
+ uint64_t EltSize = TD.getABITypeSize(STy->getElementType());
+ unsigned EltAlign = TD.getABITypeAlignment(STy->getElementType());
for (unsigned i = 0, e = NumElements; i != e; ++i) {
Constant *In = getAggregateConstantElement(Init,
ConstantInt::get(Type::Int32Ty, i));
GV->isThreadLocal());
Globals.insert(GV, NGV);
NewGlobals.push_back(NGV);
+
+ // Calculate the known alignment of the field. If the original aggregate
+ // had 256 byte alignment for example, something might depend on that:
+ // propagate info to each field.
+ unsigned NewAlign = (unsigned)MinAlign(StartAlignment, EltSize*i);
+ if (NewAlign > EltAlign)
+ NGV->setAlignment(NewAlign);
}
}
// Should handle GEP here.
SmallVector<Constant*, 8> Idxs;
Idxs.reserve(GEPI->getNumOperands()-1);
- for (unsigned i = 1, e = GEPI->getNumOperands(); i != e; ++i)
- if (Constant *C = dyn_cast<Constant>(GEPI->getOperand(i)))
+ for (User::op_iterator i = GEPI->op_begin() + 1, e = GEPI->op_end();
+ i != e; ++i)
+ if (Constant *C = dyn_cast<Constant>(*i))
Idxs.push_back(C);
else
break;
GV->getName()+".body",
(Module *)NULL,
GV->isThreadLocal());
+ // FIXME: This new global should have the alignment returned by malloc. Code
+ // could depend on malloc returning large alignment (on the mac, 16 bytes) but
+ // this would only guarantee some lower alignment.
GV->getParent()->getGlobalList().insert(GV, NewGV);
// Anything that used the malloc now uses the global directly.
case ICmpInst::ICMP_ULE:
case ICmpInst::ICMP_SLE:
case ICmpInst::ICMP_EQ:
- LV = BinaryOperator::createNot(LV, "notinit", CI);
+ LV = BinaryOperator::CreateNot(LV, "notinit", CI);
break;
case ICmpInst::ICMP_NE:
case ICmpInst::ICMP_UGE:
if (LoadInst *LI = dyn_cast<LoadInst>(*UI)) {
// We permit two users of the load: setcc comparing against the null
// pointer, and a getelementptr of a specific form.
- for (Value::use_iterator UI = LI->use_begin(), E = LI->use_end(); UI != E;
- ++UI) {
+ for (Value::use_iterator UI = LI->use_begin(), E = LI->use_end();
+ UI != E; ++UI) {
// Comparison against null is ok.
if (ICmpInst *ICI = dyn_cast<ICmpInst>(*UI)) {
if (!isa<ConstantPointerNull>(ICI->getOperand(1)))
GEPIdx.push_back(GEPI->getOperand(1));
GEPIdx.append(GEPI->op_begin()+3, GEPI->op_end());
- Value *NGEPI = GetElementPtrInst::Create(NewPtr, GEPIdx.begin(), GEPIdx.end(),
+ Value *NGEPI = GetElementPtrInst::Create(NewPtr,
+ GEPIdx.begin(), GEPIdx.end(),
GEPI->getName(), GEPI);
GEPI->replaceAllUsesWith(NGEPI);
GEPI->eraseFromParent();
if (!RunningOr)
RunningOr = Cond; // First seteq
else
- RunningOr = BinaryOperator::createOr(RunningOr, Cond, "tmp", MI);
+ RunningOr = BinaryOperator::CreateOr(RunningOr, Cond, "tmp", MI);
}
// Split the basic block at the old malloc.
else if (GetElementPtrInst *GEPI =dyn_cast<GetElementPtrInst>(StoredOnceVal)){
// "getelementptr Ptr, 0, 0, 0" is really just a cast.
bool IsJustACast = true;
- for (unsigned i = 1, e = GEPI->getNumOperands(); i != e; ++i)
- if (!isa<Constant>(GEPI->getOperand(i)) ||
- !cast<Constant>(GEPI->getOperand(i))->isNullValue()) {
+ for (User::op_iterator i = GEPI->op_begin() + 1, e = GEPI->op_end();
+ i != e; ++i)
+ if (!isa<Constant>(*i) ||
+ !cast<Constant>(*i)->isNullValue()) {
IsJustACast = false;
break;
}
// this global a local variable) we replace the global with a local alloca
// in this function.
//
- // NOTE: It doesn't make sense to promote non first class types since we
+ // NOTE: It doesn't make sense to promote non single-value types since we
// are just replacing static memory to stack memory.
if (!GS.HasMultipleAccessingFunctions &&
GS.AccessingFunction && !GS.HasNonInstructionUser &&
- GV->getType()->getElementType()->isFirstClassType() &&
+ GV->getType()->getElementType()->isSingleValueType() &&
GS.AccessingFunction->getName() == "main" &&
GS.AccessingFunction->hasExternalLinkage()) {
DOUT << "LOCALIZING GLOBAL: " << *GV;
++NumMarked;
return true;
- } else if (!GV->getInitializer()->getType()->isFirstClassType()) {
- if (GlobalVariable *FirstNewGV = SRAGlobal(GV)) {
+ } else if (!GV->getInitializer()->getType()->isSingleValueType()) {
+ if (GlobalVariable *FirstNewGV = SRAGlobal(GV,
+ getAnalysis<TargetData>())) {
GVI = FirstNewGV; // Don't skip the newly produced globals!
return true;
}
if (!isa<CallInst>(User) && !isa<InvokeInst>(User)) return false;
// See if the function address is passed as an argument.
- for (unsigned i = 1, e = User->getNumOperands(); i != e; ++i)
- if (User->getOperand(i) == F) return false;
+ for (User::op_iterator i = User->op_begin() + 1, e = User->op_end();
+ i != e; ++i)
+ if (*i == F) return false;
}
return true;
}
if (!I->hasInitializer()) return 0;
ConstantArray *CA = dyn_cast<ConstantArray>(I->getInitializer());
if (!CA) return 0;
- for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
- if (ConstantStruct *CS = dyn_cast<ConstantStruct>(CA->getOperand(i))) {
+ for (User::op_iterator i = CA->op_begin(), e = CA->op_end(); i != e; ++i)
+ if (ConstantStruct *CS = dyn_cast<ConstantStruct>(*i)) {
if (isa<ConstantPointerNull>(CS->getOperand(1)))
continue;
ConstantArray *CA = cast<ConstantArray>(GV->getInitializer());
std::vector<Function*> Result;
Result.reserve(CA->getNumOperands());
- for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) {
- ConstantStruct *CS = cast<ConstantStruct>(CA->getOperand(i));
+ for (User::op_iterator i = CA->op_begin(), e = CA->op_end(); i != e; ++i) {
+ ConstantStruct *CS = cast<ConstantStruct>(*i);
Result.push_back(dyn_cast<Function>(CS->getOperand(1)));
}
return Result;
// Break up the constant into its elements.
if (ConstantStruct *CS = dyn_cast<ConstantStruct>(Init)) {
- for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i)
- Elts.push_back(CS->getOperand(i));
+ for (User::op_iterator i = CS->op_begin(), e = CS->op_end(); i != e; ++i)
+ Elts.push_back(cast<Constant>(*i));
} else if (isa<ConstantAggregateZero>(Init)) {
for (unsigned i = 0, e = STy->getNumElements(); i != e; ++i)
Elts.push_back(Constant::getNullValue(STy->getElementType(i)));
// Break up the array into elements.
std::vector<Constant*> Elts;
if (ConstantArray *CA = dyn_cast<ConstantArray>(Init)) {
- for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
- Elts.push_back(CA->getOperand(i));
+ for (User::op_iterator i = CA->op_begin(), e = CA->op_end(); i != e; ++i)
+ Elts.push_back(cast<Constant>(*i));
} else if (isa<ConstantAggregateZero>(Init)) {
Constant *Elt = Constant::getNullValue(ATy->getElementType());
Elts.assign(ATy->getNumElements(), Elt);
} else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(CurInst)) {
Constant *P = getVal(Values, GEP->getOperand(0));
SmallVector<Constant*, 8> GEPOps;
- for (unsigned i = 1, e = GEP->getNumOperands(); i != e; ++i)
- GEPOps.push_back(getVal(Values, GEP->getOperand(i)));
+ for (User::op_iterator i = GEP->op_begin() + 1, e = GEP->op_end();
+ i != e; ++i)
+ GEPOps.push_back(getVal(Values, *i));
InstResult = ConstantExpr::getGetElementPtr(P, &GEPOps[0], GEPOps.size());
} else if (LoadInst *LI = dyn_cast<LoadInst>(CurInst)) {
if (LI->isVolatile()) return false; // no volatile accesses.
if (!Callee) return false; // Cannot resolve.
std::vector<Constant*> Formals;
- for (unsigned i = 1, e = CI->getNumOperands(); i != e; ++i)
- Formals.push_back(getVal(Values, CI->getOperand(i)));
+ for (User::op_iterator i = CI->op_begin() + 1, e = CI->op_end();
+ i != e; ++i)
+ Formals.push_back(getVal(Values, *i));
if (Callee->isDeclaration()) {
// If this is a function we can constant fold, do it.
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