Skip to content

[VPlan] Remove createReduction. NFCI #131336

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 2 commits into from
Mar 17, 2025
Merged

[VPlan] Remove createReduction. NFCI #131336

Show file tree
Hide file tree
Changes from 1 commit
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
9241f0a
[VPlan] Remove createReduction. NFCI
lukel97 Mar 14, 2025
4067d4d
Strengthen assertion in createSimpleReduction
lukel97 Mar 17, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
5 changes: 0 additions & 5 deletions llvm/include/llvm/Transforms/Utils/LoopUtils.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -427,11 +427,6 @@ Value *createAnyOfReduction(IRBuilderBase &B, Value *Src,
Value *createFindLastIVReduction(IRBuilderBase &B, Value *Src,
const RecurrenceDescriptor &Desc);

/// Create a generic reduction using a recurrence descriptor \p Desc
/// Fast-math-flags are propagated using the RecurrenceDescriptor.
Value *createReduction(IRBuilderBase &B, const RecurrenceDescriptor &Desc,
Value *Src, PHINode *OrigPhi = nullptr);

/// Create an ordered reduction intrinsic using the given recurrence
/// descriptor \p Desc.
Value *createOrderedReduction(IRBuilderBase &B,
Expand Down
18 changes: 0 additions & 18 deletions llvm/lib/Transforms/Utils/LoopUtils.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1345,24 +1345,6 @@ Value *llvm::createSimpleReduction(VectorBuilder &VBuilder, Value *Src,
return VBuilder.createSimpleReduction(Id, SrcTy, Ops);
}

Value *llvm::createReduction(IRBuilderBase &B,
const RecurrenceDescriptor &Desc, Value *Src,
PHINode *OrigPhi) {
// TODO: Support in-order reductions based on the recurrence descriptor.
// All ops in the reduction inherit fast-math-flags from the recurrence
// descriptor.
IRBuilderBase::FastMathFlagGuard FMFGuard(B);
B.setFastMathFlags(Desc.getFastMathFlags());

RecurKind RK = Desc.getRecurrenceKind();
if (RecurrenceDescriptor::isAnyOfRecurrenceKind(RK))
return createAnyOfReduction(B, Src, Desc, OrigPhi);
if (RecurrenceDescriptor::isFindLastIVRecurrenceKind(RK))
Copy link
Contributor

@david-arm david-arm Mar 17, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

It's probably a good idea to strengthen the assert in createSimpleReduction to include findlast types, i.e.

  assert(!RecurrenceDescriptor::isAnyOfRecurrenceKind(Kind) &&
         !RecurrenceDescriptor::isFindLastIVRecurrenceKind(Kind) &&
         "AnyOf reduction is not supported.");

Copy link
Contributor Author

@lukel97 lukel97 Mar 17, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Good idea, added

return createFindLastIVReduction(B, Src, Desc);

return createSimpleReduction(B, Src, RK);
}

Value *llvm::createOrderedReduction(IRBuilderBase &B,
const RecurrenceDescriptor &Desc,
Value *Src, Value *Start) {
Expand Down
19 changes: 16 additions & 3 deletions llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -666,8 +666,21 @@ Value *VPInstruction::generate(VPTransformState &State) {
RecurrenceDescriptor::isAnyOfRecurrenceKind(RK) ||
RecurrenceDescriptor::isFindLastIVRecurrenceKind(RK)) &&
!PhiR->isInLoop()) {
ReducedPartRdx =
createReduction(Builder, RdxDesc, ReducedPartRdx, OrigPhi);
// TODO: Support in-order reductions based on the recurrence descriptor.
// All ops in the reduction inherit fast-math-flags from the recurrence
// descriptor.
IRBuilderBase::FastMathFlagGuard FMFG(Builder);
Builder.setFastMathFlags(RdxDesc.getFastMathFlags());

if (RecurrenceDescriptor::isAnyOfRecurrenceKind(RK))
ReducedPartRdx =
createAnyOfReduction(Builder, ReducedPartRdx, RdxDesc, OrigPhi);
else if (RecurrenceDescriptor::isFindLastIVRecurrenceKind(RK))
ReducedPartRdx =
createFindLastIVReduction(Builder, ReducedPartRdx, RdxDesc);
else
ReducedPartRdx = createSimpleReduction(Builder, ReducedPartRdx, RK);

// If the reduction can be performed in a smaller type, we need to extend
// the reduction to the wider type before we branch to the original loop.
if (PhiTy != RdxDesc.getRecurrenceType())
Expand Down Expand Up @@ -2297,7 +2310,7 @@ void VPReductionRecipe::execute(VPTransformState &State) {
NextInChain = NewRed;
} else {
PrevInChain = State.get(getChainOp(), /*IsScalar*/ true);
NewRed = createReduction(State.Builder, RdxDesc, NewVecOp);
NewRed = createSimpleReduction(State.Builder, NewVecOp, Kind);
if (RecurrenceDescriptor::isMinMaxRecurrenceKind(Kind))
NextInChain = createMinMaxOp(State.Builder, RdxDesc.getRecurrenceKind(),
NewRed, PrevInChain);
Expand Down
Loading