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Revert r229622: "[LoopAccesses] Make VectorizerParams global" and others. r229622 brought cyclic dependencies between Analysis and Vector.

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r229622: "[LoopAccesses] Make VectorizerParams global"
  r229623: "[LoopAccesses] Stash the report from the analysis rather than emitting it"
  r229624: "[LoopAccesses] Cache the result of canVectorizeMemory"
  r229626: "[LoopAccesses] Create the analysis pass"
  r229628: "[LoopAccesses] Change debug messages from LV to LAA"
  r229630: "[LoopAccesses] Add canAnalyzeLoop"
  r229631: "[LoopAccesses] Add missing const to APIs in VectorizationReport"
  r229632: "[LoopAccesses] Split out LoopAccessReport from VectorizerReport"
  r229633: "[LoopAccesses] Add -analyze support"
  r229634: "[LoopAccesses] Change LAA:getInfo to return a constant reference"
  r229638: "Analysis: fix buildbots"

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229650 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
NAKAMURA Takumi
2015-02-18 08:34:47 +00:00
parent 87010b0917
commit 383d8c7fdd
7 changed files with 168 additions and 569 deletions
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173
include/llvm/Analysis/LoopAccessAnalysis.h
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@ -16,13 +16,11 @@
#define LLVM_ANALYSIS_LOOPACCESSANALYSIS_H
#include "llvm/ADT/EquivalenceClasses.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/AliasSetTracker.h"
#include "llvm/Analysis/ScalarEvolutionExpressions.h"
#include "llvm/IR/ValueHandle.h"
#include "llvm/Pass.h"
#include "llvm/Support/raw_ostream.h"
namespace llvm {
@ -36,52 +34,30 @@ class SCEV;
/// Optimization analysis message produced during vectorization. Messages inform
/// the user why vectorization did not occur.
class LoopAccessReport {
class VectorizationReport {
std::string Message;
const Instruction *Instr;
protected:
LoopAccessReport(const Twine &Message, const Instruction *I)
: Message(Message.str()), Instr(I) {}
Instruction *Instr;
public:
LoopAccessReport(const Instruction *I = nullptr) : Instr(I) {}
VectorizationReport(Instruction *I = nullptr)
: Message("loop not vectorized: "), Instr(I) {}
template <typename A> LoopAccessReport &operator<<(const A &Value) {
template <typename A> VectorizationReport &operator<<(const A &Value) {
raw_string_ostream Out(Message);
Out << Value;
return *this;
}
const Instruction *getInstr() const { return Instr; }
Instruction *getInstr() { return Instr; }
std::string &str() { return Message; }
const std::string &str() const { return Message; }
operator Twine() { return Message; }
/// \brief Emit an analysis note for \p PassName with the debug location from
/// the instruction in \p Message if available. Otherwise use the location of
/// \p TheLoop.
static void emitAnalysis(const LoopAccessReport &Message,
/// \brief Emit an analysis note with the debug location from the instruction
/// in \p Message if available. Otherwise use the location of \p TheLoop.
static void emitAnalysis(VectorizationReport &Message,
const Function *TheFunction,
const Loop *TheLoop,
const char *PassName);
};
/// \brief Collection of parameters shared beetween the Loop Vectorizer and the
/// Loop Access Analysis.
struct VectorizerParams {
/// \brief Maximum SIMD width.
static const unsigned MaxVectorWidth;
/// \brief VF as overridden by the user.
static unsigned VectorizationFactor;
/// \brief Interleave factor as overridden by the user.
static unsigned VectorizationInterleave;
/// \\brief When performing memory disambiguation checks at runtime do not
/// make more than this number of comparisons.
static const unsigned RuntimeMemoryCheckThreshold;
const Loop *TheLoop);
};
/// \brief Drive the analysis of memory accesses in the loop
@ -100,6 +76,30 @@ struct VectorizerParams {
/// RuntimePointerCheck class.
class LoopAccessInfo {
public:
/// \brief Collection of parameters used from the vectorizer.
struct VectorizerParams {
/// \brief Maximum simd width.
unsigned MaxVectorWidth;
/// \brief VF as overridden by the user.
unsigned VectorizationFactor;
/// \brief Interleave factor as overridden by the user.
unsigned VectorizationInterleave;
/// \\brief When performing memory disambiguation checks at runtime do not
/// make more than this number of comparisons.
unsigned RuntimeMemoryCheckThreshold;
VectorizerParams(unsigned MaxVectorWidth,
unsigned VectorizationFactor,
unsigned VectorizationInterleave,
unsigned RuntimeMemoryCheckThreshold) :
MaxVectorWidth(MaxVectorWidth),
VectorizationFactor(VectorizationFactor),
VectorizationInterleave(VectorizationInterleave),
RuntimeMemoryCheckThreshold(RuntimeMemoryCheckThreshold) {}
};
/// This struct holds information about the memory runtime legality check that
/// a group of pointers do not overlap.
struct RuntimePointerCheck {
@ -120,16 +120,10 @@ public:
void insert(ScalarEvolution *SE, Loop *Lp, Value *Ptr, bool WritePtr,
unsigned DepSetId, unsigned ASId, ValueToValueMap &Strides);
/// \brief No run-time memory checking is necessary.
bool empty() const { return Pointers.empty(); }
/// \brief Decide whether we need to issue a run-time check for pointer at
/// index \p I and \p J to prove their independence.
bool needsChecking(unsigned I, unsigned J) const;
/// \brief Print the list run-time memory checks necessary.
void print(raw_ostream &OS, unsigned Depth = 0) const;
/// This flag indicates if we need to add the runtime check.
bool Need;
/// Holds the pointers that we need to check.
@ -147,17 +141,19 @@ public:
SmallVector<unsigned, 2> AliasSetId;
};
LoopAccessInfo(Loop *L, ScalarEvolution *SE, const DataLayout *DL,
const TargetLibraryInfo *TLI, AliasAnalysis *AA,
DominatorTree *DT, ValueToValueMap &Strides);
LoopAccessInfo(Function *F, Loop *L, ScalarEvolution *SE,
const DataLayout *DL, const TargetLibraryInfo *TLI,
AliasAnalysis *AA, DominatorTree *DT,
const VectorizerParams &VectParams) :
TheFunction(F), TheLoop(L), SE(SE), DL(DL), TLI(TLI), AA(AA), DT(DT),
NumLoads(0), NumStores(0), MaxSafeDepDistBytes(-1U),
VectParams(VectParams) {}
/// Return true we can analyze the memory accesses in the loop and there are
/// no memory dependence cycles.
bool canVectorizeMemory() const { return CanVecMem; }
/// no memory dependence cycles. Replaces symbolic strides using Strides.
bool canVectorizeMemory(ValueToValueMap &Strides);
const RuntimePointerCheck *getRuntimePointerCheck() const {
return &PtrRtCheck;
}
RuntimePointerCheck *getRuntimePointerCheck() { return &PtrRtCheck; }
/// Return true if the block BB needs to be predicated in order for the loop
/// to be vectorized.
@ -165,7 +161,7 @@ public:
DominatorTree *DT);
/// Returns true if the value V is uniform within the loop.
bool isUniform(Value *V) const;
bool isUniform(Value *V);
unsigned getMaxSafeDepDistBytes() const { return MaxSafeDepDistBytes; }
unsigned getNumStores() const { return NumStores; }
@ -176,34 +172,15 @@ public:
/// Returns a pair of instructions where the first element is the first
/// instruction generated in possibly a sequence of instructions and the
/// second value is the final comparator value or NULL if no check is needed.
std::pair<Instruction *, Instruction *>
addRuntimeCheck(Instruction *Loc) const;
/// \brief The diagnostics report generated for the analysis. E.g. why we
/// couldn't analyze the loop.
const Optional<LoopAccessReport> &getReport() const { return Report; }
/// \brief Print the information about the memory accesses in the loop.
void print(raw_ostream &OS, unsigned Depth = 0) const;
/// \brief Used to ensure that if the analysis was run with speculating the
/// value of symbolic strides, the client queries it with the same assumption.
/// Only used in DEBUG build but we don't want NDEBUG-depedent ABI.
unsigned NumSymbolicStrides;
std::pair<Instruction *, Instruction *> addRuntimeCheck(Instruction *Loc);
private:
/// \brief Analyze the loop. Substitute symbolic strides using Strides.
void analyzeLoop(ValueToValueMap &Strides);
/// \brief Check if the structure of the loop allows it to be analyzed by this
/// pass.
bool canAnalyzeLoop();
void emitAnalysis(LoopAccessReport &Message);
void emitAnalysis(VectorizationReport &Message);
/// We need to check that all of the pointers in this list are disjoint
/// at runtime.
RuntimePointerCheck PtrRtCheck;
Function *TheFunction;
Loop *TheLoop;
ScalarEvolution *SE;
const DataLayout *DL;
@ -216,12 +193,8 @@ private:
unsigned MaxSafeDepDistBytes;
/// \brief Cache the result of analyzeLoop.
bool CanVecMem;
/// \brief The diagnostics report generated for the analysis. E.g. why we
/// couldn't analyze the loop.
Optional<LoopAccessReport> Report;
/// \brief Vectorizer parameters used by the analysis.
VectorizerParams VectParams;
};
Value *stripIntegerCast(Value *V);
@ -236,52 +209,6 @@ const SCEV *replaceSymbolicStrideSCEV(ScalarEvolution *SE,
ValueToValueMap &PtrToStride,
Value *Ptr, Value *OrigPtr = nullptr);
/// \brief This analysis provides dependence information for the memory accesses
/// of a loop.
///
/// It runs the analysis for a loop on demand. This can be initiated by
/// querying the loop access info via LAA::getInfo. getInfo return a
/// LoopAccessInfo object. See this class for the specifics of what information
/// is provided.
class LoopAccessAnalysis : public FunctionPass {
public:
static char ID;
LoopAccessAnalysis() : FunctionPass(ID) {
initializeLoopAccessAnalysisPass(*PassRegistry::getPassRegistry());
}
bool runOnFunction(Function &F) override;
void getAnalysisUsage(AnalysisUsage &AU) const override;
/// \brief Query the result of the loop access information for the loop \p L.
///
/// If the client speculates (and then issues run-time checks) for the values
/// of symbolic strides, \p Strides provides the mapping (see
/// replaceSymbolicStrideSCEV). If there is no cached result available run
/// the analysis.
const LoopAccessInfo &getInfo(Loop *L, ValueToValueMap &Strides);
void releaseMemory() override {
// Invalidate the cache when the pass is freed.
LoopAccessInfoMap.clear();
}
/// \brief Print the result of the analysis when invoked with -analyze.
void print(raw_ostream &OS, const Module *M = nullptr) const override;
private:
/// \brief The cache.
DenseMap<Loop *, std::unique_ptr<LoopAccessInfo>> LoopAccessInfoMap;
// The used analysis passes.
ScalarEvolution *SE;
const DataLayout *DL;
const TargetLibraryInfo *TLI;
AliasAnalysis *AA;
DominatorTree *DT;
};
} // End llvm namespace
#endif