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MergeFunctions Pass, removed DenseMap helpers.

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Patch removes rest part of code related to old implementation.

This patch belongs to patch series that improves MergeFunctions
performance time from O(N*N) to O(N*log(N)).

This one was the final patch.

llvm-svn: 211457
This commit is contained in:
Stepan Dyatkovskiy 2014-06-22 01:53:30 +00:00
parent 0431a0d1a0
commit 6c57127cdc
1 changed files with 0 additions and 104 deletions
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104
lib/Transforms/IPO/MergeFunctions.cpp
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@ -119,90 +119,6 @@ static cl::opt<unsigned> NumFunctionsForSanityCheck(
"'0' disables this check. Works only with '-debug' key."),
cl::init(0), cl::Hidden);
/// Returns the type id for a type to be hashed. We turn pointer types into
/// integers here because the actual compare logic below considers pointers and
/// integers of the same size as equal.
static Type::TypeID getTypeIDForHash(Type *Ty) {
if (Ty->isPointerTy())
return Type::IntegerTyID;
return Ty->getTypeID();
}
/// Creates a hash-code for the function which is the same for any two
/// functions that will compare equal, without looking at the instructions
/// inside the function.
static unsigned profileFunction(const Function *F) {
FunctionType *FTy = F->getFunctionType();
FoldingSetNodeID ID;
ID.AddInteger(F->size());
ID.AddInteger(F->getCallingConv());
ID.AddBoolean(F->hasGC());
ID.AddBoolean(FTy->isVarArg());
ID.AddInteger(getTypeIDForHash(FTy->getReturnType()));
for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
ID.AddInteger(getTypeIDForHash(FTy->getParamType(i)));
return ID.ComputeHash();
}
namespace {
/// ComparableFunction - A struct that pairs together functions with a
/// DataLayout so that we can keep them together as elements in the DenseSet.
class ComparableFunction {
public:
static const ComparableFunction EmptyKey;
static const ComparableFunction TombstoneKey;
static DataLayout * const LookupOnly;
ComparableFunction(Function *Func, const DataLayout *DL)
: Func(Func), Hash(profileFunction(Func)), DL(DL) {}
Function *getFunc() const { return Func; }
unsigned getHash() const { return Hash; }
const DataLayout *getDataLayout() const { return DL; }
// Drops AssertingVH reference to the function. Outside of debug mode, this
// does nothing.
void release() {
assert(Func &&
"Attempted to release function twice, or release empty/tombstone!");
Func = nullptr;
}
private:
explicit ComparableFunction(unsigned Hash)
: Func(nullptr), Hash(Hash), DL(nullptr) {}
AssertingVH<Function> Func;
unsigned Hash;
const DataLayout *DL;
};
const ComparableFunction ComparableFunction::EmptyKey = ComparableFunction(0);
const ComparableFunction ComparableFunction::TombstoneKey =
ComparableFunction(1);
DataLayout *const ComparableFunction::LookupOnly = (DataLayout*)(-1);
}
namespace llvm {
template <>
struct DenseMapInfo<ComparableFunction> {
static ComparableFunction getEmptyKey() {
return ComparableFunction::EmptyKey;
}
static ComparableFunction getTombstoneKey() {
return ComparableFunction::TombstoneKey;
}
static unsigned getHashValue(const ComparableFunction &CF) {
return CF.getHash();
}
static bool isEqual(const ComparableFunction &LHS,
const ComparableFunction &RHS);
};
}
namespace {
/// FunctionComparator - Compares two functions to determine whether or not
@ -1337,26 +1253,6 @@ bool MergeFunctions::runOnModule(Module &M) {
return Changed;
}
bool DenseMapInfo<ComparableFunction>::isEqual(const ComparableFunction &LHS,
const ComparableFunction &RHS) {
if (LHS.getFunc() == RHS.getFunc() &&
LHS.getHash() == RHS.getHash())
return true;
if (!LHS.getFunc() || !RHS.getFunc())
return false;
// One of these is a special "underlying pointer comparison only" object.
if (LHS.getDataLayout() == ComparableFunction::LookupOnly ||
RHS.getDataLayout() == ComparableFunction::LookupOnly)
return false;
assert(LHS.getDataLayout() == RHS.getDataLayout() &&
"Comparing functions for different targets");
return FunctionComparator(LHS.getDataLayout(), LHS.getFunc(), RHS.getFunc())
.compare() == 0;
}
// Replace direct callers of Old with New.
void MergeFunctions::replaceDirectCallers(Function *Old, Function *New) {
Constant *BitcastNew = ConstantExpr::getBitCast(New, Old->getType());