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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225526 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjay Patel 2015-01-09 16:47:20 +00:00
parent a987742b0e
commit 61478e3bf9
1 changed files with 35 additions and 40 deletions
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75
lib/Analysis/LazyValueInfo.cpp
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@ -54,8 +54,7 @@ namespace llvm {
// LVILatticeVal
//===----------------------------------------------------------------------===//
/// LVILatticeVal - This is the information tracked by LazyValueInfo for each
/// value.
/// This is the information tracked by LazyValueInfo for each value.
///
/// FIXME: This is basically just for bringup, this can be made a lot more rich
/// in the future.
@ -63,19 +62,19 @@ namespace llvm {
namespace {
class LVILatticeVal {
enum LatticeValueTy {
/// undefined - This Value has no known value yet.
/// This Value has no known value yet.
undefined,
/// constant - This Value has a specific constant value.
/// This Value has a specific constant value.
constant,
/// notconstant - This Value is known to not have the specified value.
/// This Value is known to not have the specified value.
notconstant,
/// constantrange - The Value falls within this range.
/// The Value falls within this range.
constantrange,
/// overdefined - This value is not known to be constant, and we know that
/// it has a value.
/// This value is not known to be constant, and we know that it has a value.
overdefined
};
@ -128,7 +127,7 @@ public:
return Range;
}
/// markOverdefined - Return true if this is a change in status.
/// Return true if this is a change in status.
bool markOverdefined() {
if (isOverdefined())
return false;
@ -136,7 +135,7 @@ public:
return true;
}
/// markConstant - Return true if this is a change in status.
/// Return true if this is a change in status.
bool markConstant(Constant *V) {
assert(V && "Marking constant with NULL");
if (ConstantInt *CI = dyn_cast<ConstantInt>(V))
@ -152,7 +151,7 @@ public:
return true;
}
/// markNotConstant - Return true if this is a change in status.
/// Return true if this is a change in status.
bool markNotConstant(Constant *V) {
assert(V && "Marking constant with NULL");
if (ConstantInt *CI = dyn_cast<ConstantInt>(V))
@ -170,7 +169,7 @@ public:
return true;
}
/// markConstantRange - Return true if this is a change in status.
/// Return true if this is a change in status.
bool markConstantRange(const ConstantRange NewR) {
if (isConstantRange()) {
if (NewR.isEmptySet())
@ -190,7 +189,7 @@ public:
return true;
}
/// mergeIn - Merge the specified lattice value into this one, updating this
/// Merge the specified lattice value into this one, updating this
/// one and returning true if anything changed.
bool mergeIn(const LVILatticeVal &RHS) {
if (RHS.isUndefined() || isOverdefined()) return false;
@ -298,8 +297,7 @@ raw_ostream &operator<<(raw_ostream &OS, const LVILatticeVal &Val) {
//===----------------------------------------------------------------------===//
namespace {
/// LVIValueHandle - A callback value handle updates the cache when
/// values are erased.
/// A callback value handle updates the cache when values are erased.
class LazyValueInfoCache;
struct LVIValueHandle : public CallbackVH {
LazyValueInfoCache *Parent;
@ -315,39 +313,38 @@ namespace {
}
namespace {
/// LazyValueInfoCache - This is the cache kept by LazyValueInfo which
/// This is the cache kept by LazyValueInfo which
/// maintains information about queries across the clients' queries.
class LazyValueInfoCache {
/// ValueCacheEntryTy - This is all of the cached block information for
/// exactly one Value*. The entries are sorted by the BasicBlock* of the
/// This is all of the cached block information for exactly one Value*.
/// The entries are sorted by the BasicBlock* of the
/// entries, allowing us to do a lookup with a binary search.
typedef std::map<AssertingVH<BasicBlock>, LVILatticeVal> ValueCacheEntryTy;
/// ValueCache - This is all of the cached information for all values,
/// This is all of the cached information for all values,
/// mapped from Value* to key information.
std::map<LVIValueHandle, ValueCacheEntryTy> ValueCache;
/// OverDefinedCache - This tracks, on a per-block basis, the set of
/// values that are over-defined at the end of that block. This is required
/// This tracks, on a per-block basis, the set of values that are
/// over-defined at the end of that block. This is required
/// for cache updating.
typedef std::pair<AssertingVH<BasicBlock>, Value*> OverDefinedPairTy;
DenseSet<OverDefinedPairTy> OverDefinedCache;
/// SeenBlocks - Keep track of all blocks that we have ever seen, so we
/// Keep track of all blocks that we have ever seen, so we
/// don't spend time removing unused blocks from our caches.
DenseSet<AssertingVH<BasicBlock> > SeenBlocks;
/// BlockValueStack - This stack holds the state of the value solver
/// during a query. It basically emulates the callstack of the naive
/// This stack holds the state of the value solver during a query.
/// It basically emulates the callstack of the naive
/// recursive value lookup process.
std::stack<std::pair<BasicBlock*, Value*> > BlockValueStack;
/// BlockValueSet - Keeps track of which block-value pairs are in
/// BlockValueStack.
/// Keeps track of which block-value pairs are in BlockValueStack.
DenseSet<std::pair<BasicBlock*, Value*> > BlockValueSet;
/// pushBlockValue - Push BV onto BlockValueStack unless it's already in
/// there. Returns true on success.
/// Push BV onto BlockValueStack unless it's already in there.
/// Returns true on success.
bool pushBlockValue(const std::pair<BasicBlock *, Value *> &BV) {
if (BlockValueSet.count(BV))
return false; // It's already in the stack.
@ -399,27 +396,26 @@ namespace {
}
public:
/// getValueInBlock - This is the query interface to determine the lattice
/// This is the query interface to determine the lattice
/// value for the specified Value* at the end of the specified block.
LVILatticeVal getValueInBlock(Value *V, BasicBlock *BB,
Instruction *CxtI = nullptr);
/// getValueAt - This is the query interface to determine the lattice
/// This is the query interface to determine the lattice
/// value for the specified Value* at the specified instruction (generally
/// from an assume intrinsic).
LVILatticeVal getValueAt(Value *V, Instruction *CxtI);
/// getValueOnEdge - This is the query interface to determine the lattice
/// This is the query interface to determine the lattice
/// value for the specified Value* that is true on the specified edge.
LVILatticeVal getValueOnEdge(Value *V, BasicBlock *FromBB,BasicBlock *ToBB,
Instruction *CxtI = nullptr);
/// threadEdge - This is the update interface to inform the cache that an
/// edge from PredBB to OldSucc has been threaded to be from PredBB to
/// NewSucc.
/// This is the update interface to inform the cache that an edge from
/// PredBB to OldSucc has been threaded to be from PredBB to NewSucc.
void threadEdge(BasicBlock *PredBB,BasicBlock *OldSucc,BasicBlock *NewSucc);
/// eraseBlock - This is part of the update interface to inform the cache
/// This is part of the update interface to inform the cache
/// that a block has been deleted.
void eraseBlock(BasicBlock *BB);
@ -1106,7 +1102,7 @@ void LazyValueInfoCache::threadEdge(BasicBlock *PredBB, BasicBlock *OldSucc,
// LazyValueInfo Impl
//===----------------------------------------------------------------------===//
/// getCache - This lazily constructs the LazyValueInfoCache.
/// This lazily constructs the LazyValueInfoCache.
static LazyValueInfoCache &getCache(void *&PImpl, AssumptionCache *AC,
const DataLayout *DL = nullptr,
DominatorTree *DT = nullptr) {
@ -1163,7 +1159,7 @@ Constant *LazyValueInfo::getConstant(Value *V, BasicBlock *BB,
return nullptr;
}
/// getConstantOnEdge - Determine whether the specified value is known to be a
/// Determine whether the specified value is known to be a
/// constant on the specified edge. Return null if not.
Constant *LazyValueInfo::getConstantOnEdge(Value *V, BasicBlock *FromBB,
BasicBlock *ToBB,
@ -1248,9 +1244,8 @@ getPredicateResult(unsigned Pred, Constant *C, LVILatticeVal &Result,
return LazyValueInfo::Unknown;
}
/// getPredicateOnEdge - Determine whether the specified value comparison
/// with a constant is known to be true or false on the specified CFG edge.
/// Pred is a CmpInst predicate.
/// Determine whether the specified value comparison with a constant is known to
/// be true or false on the specified CFG edge. Pred is a CmpInst predicate.
LazyValueInfo::Tristate
LazyValueInfo::getPredicateOnEdge(unsigned Pred, Value *V, Constant *C,
BasicBlock *FromBB, BasicBlock *ToBB,