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[LoopAccesses] Change debug messages from LV to LAA

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Also add pass name as an argument to VectorizationReport::emitAnalysis.

This is part of the patchset that converts LoopAccessAnalysis into an
actual analysis pass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229894 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adam Nemet 2015-02-19 19:15:07 +00:00
parent 0ea25c2e64
commit 9fdb32eb84
3 changed files with 46 additions and 43 deletions
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8
include/llvm/Analysis/LoopAccessAnalysis.h
View File

@ -55,11 +55,13 @@ public:
std::string &str() { return Message; }
operator Twine() { return 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.
/// \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(VectorizationReport &Message,
const Function *TheFunction,
const Loop *TheLoop);
const Loop *TheLoop,
const char *PassName);
};
/// \brief Collection of parameters shared beetween the Loop Vectorizer and the

77
lib/Analysis/LoopAccessAnalysis.cpp
View File

@ -23,7 +23,7 @@
#include "llvm/Transforms/Utils/VectorUtils.h"
using namespace llvm;
#define DEBUG_TYPE "loop-vectorize"
#define DEBUG_TYPE "loop-accesses"
static cl::opt<unsigned, true>
VectorizationFactor("force-vector-width", cl::Hidden,
@ -52,11 +52,12 @@ bool VectorizerParams::isInterleaveForced() {
void VectorizationReport::emitAnalysis(VectorizationReport &Message,
const Function *TheFunction,
const Loop *TheLoop) {
const Loop *TheLoop,
const char *PassName) {
DebugLoc DL = TheLoop->getStartLoc();
if (Instruction *I = Message.getInstr())
DL = I->getDebugLoc();
emitOptimizationRemarkAnalysis(TheFunction->getContext(), DEBUG_TYPE,
emitOptimizationRemarkAnalysis(TheFunction->getContext(), PassName,
*TheFunction, DL, Message.str());
}
@ -89,7 +90,7 @@ const SCEV *llvm::replaceSymbolicStrideSCEV(ScalarEvolution *SE,
const SCEV *ByOne =
SCEVParameterRewriter::rewrite(OrigSCEV, *SE, RewriteMap, true);
DEBUG(dbgs() << "LV: Replacing SCEV: " << *OrigSCEV << " by: " << *ByOne
DEBUG(dbgs() << "LAA: Replacing SCEV: " << *OrigSCEV << " by: " << *ByOne
<< "\n");
return ByOne;
}
@ -289,7 +290,7 @@ bool AccessAnalysis::canCheckPtrAtRT(
RtCheck.insert(SE, TheLoop, Ptr, IsWrite, DepId, ASId, StridesMap);
DEBUG(dbgs() << "LV: Found a runtime check ptr:" << *Ptr << '\n');
DEBUG(dbgs() << "LAA: Found a runtime check ptr:" << *Ptr << '\n');
} else {
CanDoRT = false;
}
@ -326,7 +327,7 @@ bool AccessAnalysis::canCheckPtrAtRT(
unsigned ASi = PtrI->getType()->getPointerAddressSpace();
unsigned ASj = PtrJ->getType()->getPointerAddressSpace();
if (ASi != ASj) {
DEBUG(dbgs() << "LV: Runtime check would require comparison between"
DEBUG(dbgs() << "LAA: Runtime check would require comparison between"
" different address spaces\n");
return false;
}
@ -341,9 +342,9 @@ void AccessAnalysis::processMemAccesses() {
// process read-only pointers. This allows us to skip dependence tests for
// read-only pointers.
DEBUG(dbgs() << "LV: Processing memory accesses...\n");
DEBUG(dbgs() << "LAA: Processing memory accesses...\n");
DEBUG(dbgs() << " AST: "; AST.dump());
DEBUG(dbgs() << "LV: Accesses:\n");
DEBUG(dbgs() << "LAA: Accesses:\n");
DEBUG({
for (auto A : Accesses)
dbgs() << "\t" << *A.getPointer() << " (" <<
@ -574,8 +575,8 @@ static int isStridedPtr(ScalarEvolution *SE, const DataLayout *DL, Value *Ptr,
// Make sure that the pointer does not point to aggregate types.
const PointerType *PtrTy = cast<PointerType>(Ty);
if (PtrTy->getElementType()->isAggregateType()) {
DEBUG(dbgs() << "LV: Bad stride - Not a pointer to a scalar type" << *Ptr <<
"\n");
DEBUG(dbgs() << "LAA: Bad stride - Not a pointer to a scalar type"
<< *Ptr << "\n");
return 0;
}
@ -583,14 +584,14 @@ static int isStridedPtr(ScalarEvolution *SE, const DataLayout *DL, Value *Ptr,
const SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(PtrScev);
if (!AR) {
DEBUG(dbgs() << "LV: Bad stride - Not an AddRecExpr pointer "
DEBUG(dbgs() << "LAA: Bad stride - Not an AddRecExpr pointer "
<< *Ptr << " SCEV: " << *PtrScev << "\n");
return 0;
}
// The accesss function must stride over the innermost loop.
if (Lp != AR->getLoop()) {
DEBUG(dbgs() << "LV: Bad stride - Not striding over innermost loop " <<
DEBUG(dbgs() << "LAA: Bad stride - Not striding over innermost loop " <<
*Ptr << " SCEV: " << *PtrScev << "\n");
}
@ -605,7 +606,7 @@ static int isStridedPtr(ScalarEvolution *SE, const DataLayout *DL, Value *Ptr,
bool IsNoWrapAddRec = AR->getNoWrapFlags(SCEV::NoWrapMask);
bool IsInAddressSpaceZero = PtrTy->getAddressSpace() == 0;
if (!IsNoWrapAddRec && !IsInBoundsGEP && !IsInAddressSpaceZero) {
DEBUG(dbgs() << "LV: Bad stride - Pointer may wrap in the address space "
DEBUG(dbgs() << "LAA: Bad stride - Pointer may wrap in the address space "
<< *Ptr << " SCEV: " << *PtrScev << "\n");
return 0;
}
@ -616,7 +617,7 @@ static int isStridedPtr(ScalarEvolution *SE, const DataLayout *DL, Value *Ptr,
// Calculate the pointer stride and check if it is consecutive.
const SCEVConstant *C = dyn_cast<SCEVConstant>(Step);
if (!C) {
DEBUG(dbgs() << "LV: Bad stride - Not a constant strided " << *Ptr <<
DEBUG(dbgs() << "LAA: Bad stride - Not a constant strided " << *Ptr <<
" SCEV: " << *PtrScev << "\n");
return 0;
}
@ -673,7 +674,7 @@ bool MemoryDepChecker::couldPreventStoreLoadForward(unsigned Distance,
}
if (MaxVFWithoutSLForwardIssues< 2*TypeByteSize) {
DEBUG(dbgs() << "LV: Distance " << Distance <<
DEBUG(dbgs() << "LAA: Distance " << Distance <<
" that could cause a store-load forwarding conflict\n");
return true;
}
@ -727,9 +728,9 @@ bool MemoryDepChecker::isDependent(const MemAccessInfo &A, unsigned AIdx,
const SCEV *Dist = SE->getMinusSCEV(Sink, Src);
DEBUG(dbgs() << "LV: Src Scev: " << *Src << "Sink Scev: " << *Sink
DEBUG(dbgs() << "LAA: Src Scev: " << *Src << "Sink Scev: " << *Sink
<< "(Induction step: " << StrideAPtr << ")\n");
DEBUG(dbgs() << "LV: Distance for " << *InstMap[AIdx] << " to "
DEBUG(dbgs() << "LAA: Distance for " << *InstMap[AIdx] << " to "
<< *InstMap[BIdx] << ": " << *Dist << "\n");
// Need consecutive accesses. We don't want to vectorize
@ -742,7 +743,7 @@ bool MemoryDepChecker::isDependent(const MemAccessInfo &A, unsigned AIdx,
const SCEVConstant *C = dyn_cast<SCEVConstant>(Dist);
if (!C) {
DEBUG(dbgs() << "LV: Dependence because of non-constant distance\n");
DEBUG(dbgs() << "LAA: Dependence because of non-constant distance\n");
ShouldRetryWithRuntimeCheck = true;
return true;
}
@ -760,7 +761,7 @@ bool MemoryDepChecker::isDependent(const MemAccessInfo &A, unsigned AIdx,
ATy != BTy))
return true;
DEBUG(dbgs() << "LV: Dependence is negative: NoDep\n");
DEBUG(dbgs() << "LAA: Dependence is negative: NoDep\n");
return false;
}
@ -769,7 +770,7 @@ bool MemoryDepChecker::isDependent(const MemAccessInfo &A, unsigned AIdx,
if (Val == 0) {
if (ATy == BTy)
return false;
DEBUG(dbgs() << "LV: Zero dependence difference but different types\n");
DEBUG(dbgs() << "LAA: Zero dependence difference but different types\n");
return true;
}
@ -778,7 +779,7 @@ bool MemoryDepChecker::isDependent(const MemAccessInfo &A, unsigned AIdx,
// Positive distance bigger than max vectorization factor.
if (ATy != BTy) {
DEBUG(dbgs() <<
"LV: ReadWrite-Write positive dependency with different types\n");
"LAA: ReadWrite-Write positive dependency with different types\n");
return false;
}
@ -796,7 +797,7 @@ bool MemoryDepChecker::isDependent(const MemAccessInfo &A, unsigned AIdx,
if (Distance < 2*TypeByteSize ||
2*TypeByteSize > MaxSafeDepDistBytes ||
Distance < TypeByteSize * ForcedUnroll * ForcedFactor) {
DEBUG(dbgs() << "LV: Failure because of Positive distance "
DEBUG(dbgs() << "LAA: Failure because of Positive distance "
<< Val.getSExtValue() << '\n');
return true;
}
@ -809,7 +810,7 @@ bool MemoryDepChecker::isDependent(const MemAccessInfo &A, unsigned AIdx,
couldPreventStoreLoadForward(Distance, TypeByteSize))
return true;
DEBUG(dbgs() << "LV: Positive distance " << Val.getSExtValue() <<
DEBUG(dbgs() << "LAA: Positive distance " << Val.getSExtValue() <<
" with max VF = " << MaxSafeDepDistBytes / TypeByteSize << '\n');
return false;
@ -896,7 +897,7 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
if (!Ld || (!Ld->isSimple() && !IsAnnotatedParallel)) {
emitAnalysis(VectorizationReport(Ld)
<< "read with atomic ordering or volatile read");
DEBUG(dbgs() << "LV: Found a non-simple load.\n");
DEBUG(dbgs() << "LAA: Found a non-simple load.\n");
CanVecMem = false;
return;
}
@ -918,7 +919,7 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
if (!St->isSimple() && !IsAnnotatedParallel) {
emitAnalysis(VectorizationReport(St)
<< "write with atomic ordering or volatile write");
DEBUG(dbgs() << "LV: Found a non-simple store.\n");
DEBUG(dbgs() << "LAA: Found a non-simple store.\n");
CanVecMem = false;
return;
}
@ -935,7 +936,7 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
// Check if we see any stores. If there are no stores, then we don't
// care if the pointers are *restrict*.
if (!Stores.size()) {
DEBUG(dbgs() << "LV: Found a read-only loop!\n");
DEBUG(dbgs() << "LAA: Found a read-only loop!\n");
CanVecMem = true;
return;
}
@ -959,7 +960,7 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
emitAnalysis(
VectorizationReport(ST)
<< "write to a loop invariant address could not be vectorized");
DEBUG(dbgs() << "LV: We don't allow storing to uniform addresses\n");
DEBUG(dbgs() << "LAA: We don't allow storing to uniform addresses\n");
CanVecMem = false;
return;
}
@ -982,7 +983,7 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
if (IsAnnotatedParallel) {
DEBUG(dbgs()
<< "LV: A loop annotated parallel, ignore memory dependency "
<< "LAA: A loop annotated parallel, ignore memory dependency "
<< "checks.\n");
CanVecMem = true;
return;
@ -1019,7 +1020,7 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
// If we write (or read-write) to a single destination and there are no
// other reads in this loop then is it safe to vectorize.
if (NumReadWrites == 1 && NumReads == 0) {
DEBUG(dbgs() << "LV: Found a write-only loop!\n");
DEBUG(dbgs() << "LAA: Found a write-only loop!\n");
CanVecMem = true;
return;
}
@ -1037,7 +1038,7 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
CanDoRT = Accesses.canCheckPtrAtRT(PtrRtCheck, NumComparisons, SE, TheLoop,
Strides);
DEBUG(dbgs() << "LV: We need to do " << NumComparisons <<
DEBUG(dbgs() << "LAA: We need to do " << NumComparisons <<
" pointer comparisons.\n");
// If we only have one set of dependences to check pointers among we don't
@ -1054,12 +1055,12 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
}
if (CanDoRT) {
DEBUG(dbgs() << "LV: We can perform a memory runtime check if needed.\n");
DEBUG(dbgs() << "LAA: We can perform a memory runtime check if needed.\n");
}
if (NeedRTCheck && !CanDoRT) {
emitAnalysis(VectorizationReport() << "cannot identify array bounds");
DEBUG(dbgs() << "LV: We can't vectorize because we can't find " <<
DEBUG(dbgs() << "LAA: We can't vectorize because we can't find " <<
"the array bounds.\n");
PtrRtCheck.reset();
CanVecMem = false;
@ -1070,13 +1071,13 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
CanVecMem = true;
if (Accesses.isDependencyCheckNeeded()) {
DEBUG(dbgs() << "LV: Checking memory dependencies\n");
DEBUG(dbgs() << "LAA: Checking memory dependencies\n");
CanVecMem = DepChecker.areDepsSafe(
DependentAccesses, Accesses.getDependenciesToCheck(), Strides);
MaxSafeDepDistBytes = DepChecker.getMaxSafeDepDistBytes();
if (!CanVecMem && DepChecker.shouldRetryWithRuntimeCheck()) {
DEBUG(dbgs() << "LV: Retrying with memory checks\n");
DEBUG(dbgs() << "LAA: Retrying with memory checks\n");
NeedRTCheck = true;
// Clear the dependency checks. We assume they are not needed.
@ -1099,7 +1100,7 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
<< NumComparisons << " exceeds limit of "
<< VectorizerParams::RuntimeMemoryCheckThreshold
<< " dependent memory operations checked at runtime");
DEBUG(dbgs() << "LV: Can't vectorize with memory checks\n");
DEBUG(dbgs() << "LAA: Can't vectorize with memory checks\n");
PtrRtCheck.reset();
CanVecMem = false;
return;
@ -1113,7 +1114,7 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
emitAnalysis(VectorizationReport() <<
"unsafe dependent memory operations in loop");
DEBUG(dbgs() << "LV: We" << (NeedRTCheck ? "" : " don't") <<
DEBUG(dbgs() << "LAA: We" << (NeedRTCheck ? "" : " don't") <<
" need a runtime memory check.\n");
}
@ -1165,12 +1166,12 @@ LoopAccessInfo::addRuntimeCheck(Instruction *Loc) {
const SCEV *Sc = SE->getSCEV(Ptr);
if (SE->isLoopInvariant(Sc, TheLoop)) {
DEBUG(dbgs() << "LV: Adding RT check for a loop invariant ptr:" <<
DEBUG(dbgs() << "LAA: Adding RT check for a loop invariant ptr:" <<
*Ptr <<"\n");
Starts.push_back(Ptr);
Ends.push_back(Ptr);
} else {
DEBUG(dbgs() << "LV: Adding RT check for range:" << *Ptr << '\n');
DEBUG(dbgs() << "LAA: Adding RT check for range:" << *Ptr << '\n');
unsigned AS = Ptr->getType()->getPointerAddressSpace();
// Use this type for pointer arithmetic.

4
lib/Transforms/Vectorize/LoopVectorize.cpp
View File

@ -816,7 +816,7 @@ private:
/// Report an analysis message to assist the user in diagnosing loops that are
/// not vectorized.
void emitAnalysis(VectorizationReport &Message) {
VectorizationReport::emitAnalysis(Message, TheFunction, TheLoop);
VectorizationReport::emitAnalysis(Message, TheFunction, TheLoop, LV_NAME);
}
unsigned NumPredStores;
@ -953,7 +953,7 @@ private:
/// Report an analysis message to assist the user in diagnosing loops that are
/// not vectorized.
void emitAnalysis(VectorizationReport &Message) {
VectorizationReport::emitAnalysis(Message, TheFunction, TheLoop);
VectorizationReport::emitAnalysis(Message, TheFunction, TheLoop, LV_NAME);
}
/// Values used only by @llvm.assume calls.