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[LoopAccesses] Split out LoopAccessReport from VectorizerReport

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The only difference between these two is that VectorizerReport adds a
vectorizer-specific prefix to its messages.  When LAA is used in the
vectorizer context the prefix is added when we promote the
LoopAccessReport into a VectorizerReport via one of the constructors.

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@229632 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adam Nemet
2015-02-18 03:44:25 +00:00
parent 69c9697fa7
commit c548c640bc
3 changed files with 56 additions and 34 deletions
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36
lib/Analysis/LoopAccessAnalysis.cpp
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@ -25,10 +25,10 @@ using namespace llvm;
#define DEBUG_TYPE "loop-accesses"
void VectorizationReport::emitAnalysis(const VectorizationReport &Message,
const Function *TheFunction,
const Loop *TheLoop,
const char *PassName) {
void LoopAccessReport::emitAnalysis(const LoopAccessReport &Message,
const Function *TheFunction,
const Loop *TheLoop,
const char *PassName) {
DebugLoc DL = TheLoop->getStartLoc();
if (const Instruction *I = Message.getInstr())
DL = I->getDebugLoc();
@ -833,14 +833,14 @@ bool MemoryDepChecker::areDepsSafe(AccessAnalysis::DepCandidates &AccessSets,
bool LoopAccessInfo::canAnalyzeLoop() {
// We can only analyze innermost loops.
if (!TheLoop->empty()) {
emitAnalysis(VectorizationReport() << "loop is not the innermost loop");
emitAnalysis(LoopAccessReport() << "loop is not the innermost loop");
return false;
}
// We must have a single backedge.
if (TheLoop->getNumBackEdges() != 1) {
emitAnalysis(
VectorizationReport() <<
LoopAccessReport() <<
"loop control flow is not understood by analyzer");
return false;
}
@ -848,7 +848,7 @@ bool LoopAccessInfo::canAnalyzeLoop() {
// We must have a single exiting block.
if (!TheLoop->getExitingBlock()) {
emitAnalysis(
VectorizationReport() <<
LoopAccessReport() <<
"loop control flow is not understood by analyzer");
return false;
}
@ -858,7 +858,7 @@ bool LoopAccessInfo::canAnalyzeLoop() {
// instructions in the loop are executed the same number of times.
if (TheLoop->getExitingBlock() != TheLoop->getLoopLatch()) {
emitAnalysis(
VectorizationReport() <<
LoopAccessReport() <<
"loop control flow is not understood by analyzer");
return false;
}
@ -870,7 +870,7 @@ bool LoopAccessInfo::canAnalyzeLoop() {
// ScalarEvolution needs to be able to find the exit count.
const SCEV *ExitCount = SE->getBackedgeTakenCount(TheLoop);
if (ExitCount == SE->getCouldNotCompute()) {
emitAnalysis(VectorizationReport() <<
emitAnalysis(LoopAccessReport() <<
"could not determine number of loop iterations");
DEBUG(dbgs() << "LAA: SCEV could not compute the loop exit count.\n");
return false;
@ -919,7 +919,7 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
LoadInst *Ld = dyn_cast<LoadInst>(it);
if (!Ld || (!Ld->isSimple() && !IsAnnotatedParallel)) {
emitAnalysis(VectorizationReport(Ld)
emitAnalysis(LoopAccessReport(Ld)
<< "read with atomic ordering or volatile read");
DEBUG(dbgs() << "LAA: Found a non-simple load.\n");
CanVecMem = false;
@ -935,13 +935,13 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
if (it->mayWriteToMemory()) {
StoreInst *St = dyn_cast<StoreInst>(it);
if (!St) {
emitAnalysis(VectorizationReport(it) <<
emitAnalysis(LoopAccessReport(it) <<
"instruction cannot be vectorized");
CanVecMem = false;
return;
}
if (!St->isSimple() && !IsAnnotatedParallel) {
emitAnalysis(VectorizationReport(St)
emitAnalysis(LoopAccessReport(St)
<< "write with atomic ordering or volatile write");
DEBUG(dbgs() << "LAA: Found a non-simple store.\n");
CanVecMem = false;
@ -982,7 +982,7 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
if (isUniform(Ptr)) {
emitAnalysis(
VectorizationReport(ST)
LoopAccessReport(ST)
<< "write to a loop invariant address could not be vectorized");
DEBUG(dbgs() << "LAA: We don't allow storing to uniform addresses\n");
CanVecMem = false;
@ -1083,7 +1083,7 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
}
if (NeedRTCheck && !CanDoRT) {
emitAnalysis(VectorizationReport() << "cannot identify array bounds");
emitAnalysis(LoopAccessReport() << "cannot identify array bounds");
DEBUG(dbgs() << "LAA: We can't vectorize because we can't find " <<
"the array bounds.\n");
PtrRtCheck.reset();
@ -1117,10 +1117,10 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
if (!CanDoRT ||
NumComparisons > VectorizerParams::RuntimeMemoryCheckThreshold) {
if (!CanDoRT && NumComparisons > 0)
emitAnalysis(VectorizationReport()
emitAnalysis(LoopAccessReport()
<< "cannot check memory dependencies at runtime");
else
emitAnalysis(VectorizationReport()
emitAnalysis(LoopAccessReport()
<< NumComparisons << " exceeds limit of "
<< VectorizerParams::RuntimeMemoryCheckThreshold
<< " dependent memory operations checked at runtime");
@ -1135,7 +1135,7 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
}
if (!CanVecMem)
emitAnalysis(VectorizationReport() <<
emitAnalysis(LoopAccessReport() <<
"unsafe dependent memory operations in loop");
DEBUG(dbgs() << "LAA: We" << (NeedRTCheck ? "" : " don't") <<
@ -1151,7 +1151,7 @@ bool LoopAccessInfo::blockNeedsPredication(BasicBlock *BB, Loop *TheLoop,
return !DT->dominates(BB, Latch);
}
void LoopAccessInfo::emitAnalysis(VectorizationReport &Message) {
void LoopAccessInfo::emitAnalysis(LoopAccessReport &Message) {
assert(!Report && "Multiple report generated");
Report = Message;
}