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[LoopAccesses] Make blockNeedsPredication static

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blockNeedsPredication is in LoopAccess in order to share it with the
vectorizer.  It's a utility needed by LoopAccess not strictly provided
by it but it's a good place to share it.  This makes the function static
so that it no longer required to create an LoopAccessInfo instance in
order to access it from LV.

This was actually causing problems because it would have required
creating LAI much earlier that LV::canVectorizeMemory().

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@229625 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adam Nemet 2015-02-18 03:43:19 +00:00
parent 14cc2e25c5
commit 0d1e8dd84e
3 changed files with 10 additions and 6 deletions
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3
include/llvm/Analysis/LoopAccessAnalysis.h
View File

@ -147,7 +147,8 @@ public:
/// Return true if the block BB needs to be predicated in order for the loop
/// to be vectorized.
bool blockNeedsPredication(BasicBlock *BB);
static bool blockNeedsPredication(BasicBlock *BB, Loop *TheLoop,
DominatorTree *DT);
/// Returns true if the value V is uniform within the loop.
bool isUniform(Value *V);

7
lib/Analysis/LoopAccessAnalysis.cpp
View File

@ -931,7 +931,7 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
// The TBAA metadata could have a control dependency on the predication
// condition, so we cannot rely on it when determining whether or not we
// need runtime pointer checks.
if (blockNeedsPredication(ST->getParent()))
if (blockNeedsPredication(ST->getParent(), TheLoop, DT))
Loc.AATags.TBAA = nullptr;
Accesses.addStore(Loc);
@ -968,7 +968,7 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
// The TBAA metadata could have a control dependency on the predication
// condition, so we cannot rely on it when determining whether or not we
// need runtime pointer checks.
if (blockNeedsPredication(LD->getParent()))
if (blockNeedsPredication(LD->getParent(), TheLoop, DT))
Loc.AATags.TBAA = nullptr;
Accesses.addLoad(Loc, IsReadOnlyPtr);
@ -1075,7 +1075,8 @@ void LoopAccessInfo::analyzeLoop(ValueToValueMap &Strides) {
" need a runtime memory check.\n");
}
bool LoopAccessInfo::blockNeedsPredication(BasicBlock *BB) {
bool LoopAccessInfo::blockNeedsPredication(BasicBlock *BB, Loop *TheLoop,
DominatorTree *DT) {
assert(TheLoop->contains(BB) && "Unknown block used");
// Blocks that do not dominate the latch need predication.

6
lib/Transforms/Vectorize/LoopVectorize.cpp
View File

@ -554,7 +554,7 @@ public:
AliasAnalysis *AA, Function *F,
const TargetTransformInfo *TTI)
: NumPredStores(0), TheLoop(L), SE(SE), DL(DL),
TLI(TLI), TheFunction(F), TTI(TTI), Induction(nullptr),
TLI(TLI), TheFunction(F), TTI(TTI), DT(DT), Induction(nullptr),
WidestIndTy(nullptr),
LAI(L, SE, DL, TLI, AA, DT),
HasFunNoNaNAttr(false) {}
@ -855,6 +855,8 @@ private:
Function *TheFunction;
/// Target Transform Info
const TargetTransformInfo *TTI;
/// Dominator Tree.
DominatorTree *DT;
// --- vectorization state --- //
@ -4173,7 +4175,7 @@ bool LoopVectorizationLegality::isInductionVariable(const Value *V) {
}
bool LoopVectorizationLegality::blockNeedsPredication(BasicBlock *BB) {
return LAI.blockNeedsPredication(BB);
return LoopAccessInfo::blockNeedsPredication(BB, TheLoop, DT);
}
bool LoopVectorizationLegality::blockCanBePredicated(BasicBlock *BB,