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[VPlan] Materialize VF and VFxUF using VPInstructions. #152879

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Merged
merged 9 commits into from
Aug 12, 2025
Merged

[VPlan] Materialize VF and VFxUF using VPInstructions. #152879

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59322c5
[VPlan] Materialize VF and VFxUF using VPInstructions.
fhahn Aug 2, 2025
3367a1f
Merge remote-tracking branch 'origin/main' into vplan-materialize-vf-…
fhahn Aug 11, 2025
e26258b
!fixup after merge, address comments, thanks
fhahn Aug 11, 2025
929db2e
Merge remote-tracking branch 'origin/main' into vplan-materialize-vf-…
fhahn Aug 11, 2025
4aa2925
!fixup address comments, thanks
fhahn Aug 11, 2025
f03fdfb
Merge remote-tracking branch 'origin/main' into vplan-materialize-vf-…
fhahn Aug 11, 2025
1cc3267
Merge remote-tracking branch 'origin/main' into vplan-materialize-vf-…
fhahn Aug 11, 2025
a404171
Merge remote-tracking branch 'origin/main' into vplan-materialize-vf-…
fhahn Aug 12, 2025
dab0d23
!fixup address comments, thanks
fhahn Aug 12, 2025
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2 changes: 1 addition & 1 deletion llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
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Expand Up @@ -7304,6 +7304,7 @@ DenseMap<const SCEV *, Value *> LoopVectorizationPlanner::executePlan(
VPlanTransforms::materializeVectorTripCount(
BestVPlan, VectorPH, CM.foldTailByMasking(),
CM.requiresScalarEpilogue(BestVF.isVector()));
VPlanTransforms::materializeVFAndVFxUF(BestVPlan, VectorPH, BestVF);

// Perform the actual loop transformation.
VPTransformState State(&TTI, BestVF, LI, DT, ILV.AC, ILV.Builder, &BestVPlan,
Expand Down Expand Up @@ -7360,7 +7361,6 @@ DenseMap<const SCEV *, Value *> LoopVectorizationPlanner::executePlan(
//===------------------------------------------------===//

// 2. Copy and widen instructions from the old loop into the new loop.
BestVPlan.prepareToExecute(State);
replaceVPBBWithIRVPBB(VectorPH, State.CFG.PrevBB);

// Move check blocks to their final position.
Expand Down
16 changes: 0 additions & 16 deletions llvm/lib/Transforms/Vectorize/VPlan.cpp
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Expand Up @@ -951,22 +951,6 @@ VPlan::~VPlan() {
delete BackedgeTakenCount;
}

void VPlan::prepareToExecute(VPTransformState &State) {
IRBuilder<> Builder(State.CFG.PrevBB->getTerminator());
Type *TCTy = VPTypeAnalysis(*this).inferScalarType(getTripCount());
// FIXME: Model VF * UF computation completely in VPlan.
unsigned UF = getUF();
if (VF.getNumUsers()) {
Value *RuntimeVF = getRuntimeVF(Builder, TCTy, State.VF);
VF.setUnderlyingValue(RuntimeVF);
VFxUF.setUnderlyingValue(
UF > 1 ? Builder.CreateMul(RuntimeVF, ConstantInt::get(TCTy, UF))
: RuntimeVF);
} else {
VFxUF.setUnderlyingValue(createStepForVF(Builder, TCTy, State.VF, UF));
}
}

VPIRBasicBlock *VPlan::getExitBlock(BasicBlock *IRBB) const {
auto Iter = find_if(getExitBlocks(), [IRBB](const VPIRBasicBlock *VPIRBB) {
return VPIRBB->getIRBasicBlock() == IRBB;
Expand Down
5 changes: 2 additions & 3 deletions llvm/lib/Transforms/Vectorize/VPlan.h
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Expand Up @@ -1019,6 +1019,7 @@ class LLVM_ABI_FOR_TEST VPInstruction : public VPRecipeWithIRFlags,
/// The lane specifies an index into a vector formed by combining all vector
/// operands (all operands after the first one).
ExtractLane,
VScale,

};

Expand Down Expand Up @@ -1167,6 +1168,7 @@ class VPInstructionWithType : public VPInstruction {
switch (VPI->getOpcode()) {
case VPInstruction::WideIVStep:
case VPInstruction::StepVector:
case VPInstruction::VScale:
return true;
default:
return false;
Expand Down Expand Up @@ -3968,9 +3970,6 @@ class VPlan {
VPBB->setPlan(this);
}

/// Prepare the plan for execution, setting up the required live-in values.
void prepareToExecute(VPTransformState &State);

/// Generate the IR code for this VPlan.
void execute(VPTransformState *State);

Expand Down
11 changes: 11 additions & 0 deletions llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
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Expand Up @@ -452,6 +452,7 @@ unsigned VPInstruction::getNumOperandsForOpcode(unsigned Opcode) {

switch (Opcode) {
case VPInstruction::StepVector:
case VPInstruction::VScale:
return 0;
case Instruction::Alloca:
case Instruction::ExtractValue:
Expand Down Expand Up @@ -1027,6 +1028,7 @@ bool VPInstruction::isSingleScalar() const {
switch (getOpcode()) {
case Instruction::PHI:
case VPInstruction::ExplicitVectorLength:
case VPInstruction::VScale:
return true;
default:
return isScalarCast();
Expand Down Expand Up @@ -1281,6 +1283,12 @@ void VPInstructionWithType::execute(VPTransformState &State) {
State.set(this, StepVector);
break;
}
case VPInstruction::VScale: {
Value *VScale = State.Builder.CreateVScale(ResultTy);
State.set(this, VScale, true);
break;
}

default:
llvm_unreachable("opcode not implemented yet");
}
Expand All @@ -1301,6 +1309,9 @@ void VPInstructionWithType::print(raw_ostream &O, const Twine &Indent,
case VPInstruction::StepVector:
O << "step-vector " << *ResultTy;
break;
case VPInstruction::VScale:
O << "vscale " << *ResultTy;
break;
default:
assert(Instruction::isCast(getOpcode()) && "unhandled opcode");
O << Instruction::getOpcodeName(getOpcode()) << " ";
Expand Down
44 changes: 44 additions & 0 deletions llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
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Expand Up @@ -3339,6 +3339,50 @@ void VPlanTransforms::materializeVectorTripCount(VPlan &Plan,
VectorTC.replaceAllUsesWith(Res);
}

void VPlanTransforms::materializeVFAndVFxUF(VPlan &Plan, VPBasicBlock *VectorPH,
ElementCount VFEC) {
VPBuilder Builder(VectorPH, VectorPH->begin());
auto *TCTy = VPTypeAnalysis(Plan).inferScalarType(Plan.getTripCount());
VPValue &VF = Plan.getVF();
VPValue &VFxUF = Plan.getVFxUF();
Comment on lines +3343 to +3344
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So Plan's getVF() and getVFxUF() become obsolete from this point? They will remain use-less, no longer retrieving the relevant values. Worth noting, or hooking them to their replacements?

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Yep, for now, there are no users of getVF and getVFxUF at after this point. It would be good to mark them as such, but I'm not sure what the best way would be. Another alternative would be manage them as actual users. They should also be region-specific. I'll prepare some follow-ups for that.

if (VF.getNumUsers()) {
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Deal with the simpler complementary case first? Add comment why needed - distinct orders explained below. Can also guard handling VFxUF if it has users.

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Added comments, thanks! I've not added a use check for now, as this will easily be cleaned up by VPlan dce

VPValue *RuntimeVF =
Plan.getOrAddLiveIn(ConstantInt::get(TCTy, VFEC.getKnownMinValue()));
if (VFEC.isScalable())
RuntimeVF = Builder.createNaryOp(
Instruction::Mul,
{Builder.createNaryOp(VPInstruction::VScale, {}, TCTy), RuntimeVF},
VPIRFlags::WrapFlagsTy(true, false));
if (any_of(VF.users(), [&VF](VPUser *U) { return !U->usesScalars(&VF); })) {
auto *BC = Builder.createNaryOp(VPInstruction::Broadcast, {RuntimeVF});
VF.replaceUsesWithIf(
BC, [&VF](VPUser &U, unsigned) { return !U.usesScalars(&VF); });
}
VF.replaceAllUsesWith(RuntimeVF);
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How does this work, given you're undoing the VF.replaceUsesWithIf call above?

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Vector uses will be replaced above with the broadcast, the remaining users get the scalar value.

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Oh I see now, sorry! By the time we get to the second line the uses of VF that were replaced before are no longer present in the use list.


VPValue *UF = Plan.getOrAddLiveIn(ConstantInt::get(TCTy, Plan.getUF()));
auto *MulByUF = Plan.getUF() == 1 ? RuntimeVF
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Can you not just fall through to the bottom of the function - it looks like we're just duplicating code here.

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I'm not sure how, we if VF is used we first multiply VF * vscale and then multiply that by UF, wherease below we compute (VF * UF) * vscale

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Perhaps I'm missing something, but it looked like these two pieces of code were calculating the same thing:

    VPValue *UF = Plan.getOrAddLiveIn(ConstantInt::get(TCTy, Plan.getUF()));
    VPValue *MulByUF =
        Plan.getUF() == 1
            ? RuntimeVF
            : Builder.createNaryOp(Instruction::Mul, {RuntimeVF, UF});
  }

and

  VPValue *RuntimeVFxUF = Builder.createElementCount(TCTy, VFEC * Plan.getUF());

The only difference seems to be that you're not using createOverflowingOp when multiplying the UF, whereas Builder.createElementCount(TCTy, VFEC * Plan.getUF()) does.

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Hm, but they generate operations in slightly different order, the first does (VF * Vscale) * UF, whereas otherwise we do ((VF * UF) * vscale), the former will serve users of the runtime-vf.

Both compute the same value, but in different order. The patch keeps the sequence the same as for IR.

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OK, but I'm a bit surprised that the order of multiplication is crucial for correctness here. At the moment it just looks like the code is deliberately trying hard to maintain the order of multiplication whereas in reality if the order matters then something is horribly broken, right? I would expect the vectoriser to always choose VF,UF pairs such that (VF * VScale) * UF == (VF * UF) * VScale. If not, then I believe that we need to fix the vectoriser to ensure this cannot happen.

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It’s not needed for correctness, as mentioned above they both compute the same value.

but if there are no users of the runtime vf, the current code constant folds the UF*VF.getKnownMinValue() computation, which is not possibly if there are users for VF.getKnownMinValue()*vscale.

one could argue that we could always create VFvscaleUF, and rely on recipe simplifications to fold the VFUF computations if there no users of VFvscale.

This would certainly be possible once we have the computation explicit in VPlan, but the current patch just tries to port the existing computation, to avoid unrelated test changes.

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OK fair enough, thanks for the explanation. I do get the argument that you want to minimise test changes and I'm happy with that. I just wanted to understand the rationale behind it that's all and make sure there isn't a hidden bug or assumption here.

: Builder.createNaryOp(Instruction::Mul,
{RuntimeVF, UF});
VFxUF.replaceAllUsesWith(MulByUF);
return;
}

unsigned VFMulUF = VFEC.getKnownMinValue() * Plan.getUF();
VPValue *RuntimeVFxUF = Plan.getOrAddLiveIn(ConstantInt::get(TCTy, VFMulUF));
if (VFEC.isScalable()) {
RuntimeVFxUF =
VFMulUF == 1
? RuntimeVFxUF
: Builder.createNaryOp(
Instruction::Mul,
{Builder.createNaryOp(VPInstruction::VScale, {}, TCTy),
RuntimeVFxUF},
VPIRFlags::WrapFlagsTy(true, false));
}
VFxUF.replaceAllUsesWith(RuntimeVFxUF);
}

/// Returns true if \p V is VPWidenLoadRecipe or VPInterleaveRecipe that can be
/// converted to a narrower recipe. \p V is used by a wide recipe that feeds a
/// store interleave group at index \p Idx, \p WideMember0 is the recipe feeding
Expand Down
4 changes: 4 additions & 0 deletions llvm/lib/Transforms/Vectorize/VPlanTransforms.h
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Expand Up @@ -276,6 +276,10 @@ struct VPlanTransforms {
static void materializeBackedgeTakenCount(VPlan &Plan,
VPBasicBlock *VectorPH);

/// Materialize VF and VFxUF to be computed explicitly using VPInstructions.
static void materializeVFAndVFxUF(VPlan &Plan, VPBasicBlock *VectorPH,
ElementCount VF);

/// Try to convert a plan with interleave groups with VF elements to a plan
/// with the interleave groups replaced by wide loads and stores processing VF
/// elements, if all transformed interleave groups access the full vector
Expand Down
8 changes: 4 additions & 4 deletions llvm/test/Transforms/LoopVectorize/AArch64/sve-inductions-unusual-types.ll
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Expand Up @@ -14,12 +14,12 @@ define void @induction_i7(ptr %dst) #0 {
; CHECK: vector.ph:
; CHECK-NEXT: [[TMP4:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[TMP40:%.*]] = mul nuw i64 [[TMP4]], 2
; CHECK-NEXT: [[DOTSPLATINSERT:%.*]] = insertelement <vscale x 2 x i64> poison, i64 [[TMP40]], i64 0
; CHECK-NEXT: [[DOTSPLAT_:%.*]] = shufflevector <vscale x 2 x i64> [[DOTSPLATINSERT]], <vscale x 2 x i64> poison, <vscale x 2 x i32> zeroinitializer
; CHECK-NEXT: [[TMP5:%.*]] = mul i64 [[TMP40]], 2
; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 64, [[TMP5]]
; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 64, [[N_MOD_VF]]
; CHECK-NEXT: [[IND_END:%.*]] = trunc i64 [[N_VEC]] to i7
; CHECK-NEXT: [[DOTSPLATINSERT:%.*]] = insertelement <vscale x 2 x i64> poison, i64 [[TMP40]], i64 0
; CHECK-NEXT: [[DOTSPLAT_:%.*]] = shufflevector <vscale x 2 x i64> [[DOTSPLATINSERT]], <vscale x 2 x i64> poison, <vscale x 2 x i32> zeroinitializer
; CHECK-NEXT: [[DOTSPLAT:%.*]] = trunc <vscale x 2 x i64> [[DOTSPLAT_]] to <vscale x 2 x i7>
; CHECK-NEXT: [[TMP6:%.*]] = call <vscale x 2 x i8> @llvm.stepvector.nxv2i8()
; CHECK-NEXT: [[TMP7:%.*]] = trunc <vscale x 2 x i8> [[TMP6]] to <vscale x 2 x i7>
Expand Down Expand Up @@ -76,12 +76,12 @@ define void @induction_i3_zext(ptr %dst) #0 {
; CHECK: vector.ph:
; CHECK-NEXT: [[TMP4:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[TMP40:%.*]] = mul nuw i64 [[TMP4]], 2
; CHECK-NEXT: [[DOTSPLATINSERT:%.*]] = insertelement <vscale x 2 x i64> poison, i64 [[TMP40]], i64 0
; CHECK-NEXT: [[DOTSPLAT_:%.*]] = shufflevector <vscale x 2 x i64> [[DOTSPLATINSERT]], <vscale x 2 x i64> poison, <vscale x 2 x i32> zeroinitializer
; CHECK-NEXT: [[TMP5:%.*]] = mul i64 [[TMP40]], 2
; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 64, [[TMP5]]
; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 64, [[N_MOD_VF]]
; CHECK-NEXT: [[IND_END:%.*]] = trunc i64 [[N_VEC]] to i3
; CHECK-NEXT: [[DOTSPLATINSERT:%.*]] = insertelement <vscale x 2 x i64> poison, i64 [[TMP40]], i64 0
; CHECK-NEXT: [[DOTSPLAT_:%.*]] = shufflevector <vscale x 2 x i64> [[DOTSPLATINSERT]], <vscale x 2 x i64> poison, <vscale x 2 x i32> zeroinitializer
; CHECK-NEXT: [[DOTSPLAT:%.*]] = trunc <vscale x 2 x i64> [[DOTSPLAT_]] to <vscale x 2 x i3>
; CHECK-NEXT: [[TMP6:%.*]] = call <vscale x 2 x i8> @llvm.stepvector.nxv2i8()
; CHECK-NEXT: [[TMP7:%.*]] = trunc <vscale x 2 x i8> [[TMP6]] to <vscale x 2 x i3>
Expand Down
1 change: 0 additions & 1 deletion llvm/test/Transforms/LoopVectorize/AArch64/vplan-printing.ll
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Expand Up @@ -72,7 +72,6 @@ define i32 @print_partial_reduction(ptr %a, ptr %b) {
; CHECK-NEXT: No successors
; CHECK-NEXT: }
; CHECK: VPlan 'Final VPlan for VF={8,16},UF={1}' {
; CHECK-NEXT: Live-in ir<[[EP_VFxUF:.+]]> = VF * UF
; CHECK-NEXT: Live-in ir<1024> = original trip-count
; CHECK-EMPTY:
; CHECK-NEXT: ir-bb<entry>:
Expand Down
14 changes: 5 additions & 9 deletions llvm/test/Transforms/LoopVectorize/RISCV/first-order-recurrence-scalable-vf1.ll
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Expand Up @@ -12,9 +12,6 @@ define i64 @pr97452_scalable_vf1_for(ptr %src, ptr noalias %dst) #0 {
; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 23, [[TMP0]]
; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: [[TMP1:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 23, [[TMP1]]
; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 23, [[N_MOD_VF]]
; CHECK-NEXT: [[TMP3:%.*]] = call i32 @llvm.vscale.i32()
; CHECK-NEXT: [[TMP4:%.*]] = sub i32 [[TMP3]], 1
; CHECK-NEXT: [[VECTOR_RECUR_INIT:%.*]] = insertelement <vscale x 1 x i64> poison, i64 0, i32 [[TMP4]]
Expand All @@ -27,21 +24,20 @@ define i64 @pr97452_scalable_vf1_for(ptr %src, ptr noalias %dst) #0 {
; CHECK-NEXT: [[TMP7:%.*]] = call <vscale x 1 x i64> @llvm.vector.splice.nxv1i64(<vscale x 1 x i64> [[VECTOR_RECUR]], <vscale x 1 x i64> [[WIDE_LOAD]], i32 -1)
; CHECK-NEXT: [[TMP8:%.*]] = getelementptr inbounds i64, ptr [[DST]], i64 [[INDEX]]
; CHECK-NEXT: store <vscale x 1 x i64> [[TMP7]], ptr [[TMP8]], align 8
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], [[TMP1]]
; CHECK-NEXT: [[TMP10:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT: br i1 [[TMP10]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 1
; CHECK-NEXT: [[TMP6:%.*]] = icmp eq i64 [[INDEX_NEXT]], 23
; CHECK-NEXT: br i1 [[TMP6]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: [[TMP11:%.*]] = call i32 @llvm.vscale.i32()
; CHECK-NEXT: [[TMP12:%.*]] = sub i32 [[TMP11]], 1
; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT:%.*]] = extractelement <vscale x 1 x i64> [[WIDE_LOAD]], i32 [[TMP12]]
; CHECK-NEXT: [[TMP14:%.*]] = call i32 @llvm.vscale.i32()
; CHECK-NEXT: [[TMP15:%.*]] = sub i32 [[TMP14]], 1
; CHECK-NEXT: [[TMP16:%.*]] = extractelement <vscale x 1 x i64> [[TMP7]], i32 [[TMP15]]
; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 23, [[N_VEC]]
; CHECK-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]]
; CHECK-NEXT: br i1 true, label %[[EXIT:.*]], label %[[SCALAR_PH]]
; CHECK: [[SCALAR_PH]]:
; CHECK-NEXT: [[SCALAR_RECUR_INIT:%.*]] = phi i64 [ [[VECTOR_RECUR_EXTRACT]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 23, %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: [[FOR:%.*]] = phi i64 [ [[SCALAR_RECUR_INIT]], %[[SCALAR_PH]] ], [ [[L:%.*]], %[[LOOP]] ]
Expand Down
8 changes: 0 additions & 8 deletions llvm/test/Transforms/LoopVectorize/RISCV/interleaved-accesses.ll
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Expand Up @@ -1012,7 +1012,6 @@ define void @load_store_factor5(ptr %p) {
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK: vector.ph:
; CHECK-NEXT: [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
; CHECK: vector.body:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
Expand Down Expand Up @@ -1155,7 +1154,6 @@ define void @load_store_factor5(ptr %p) {
; SCALABLE-NEXT: entry:
; SCALABLE-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; SCALABLE: vector.ph:
; SCALABLE-NEXT: [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
; SCALABLE-NEXT: br label [[VECTOR_BODY:%.*]]
; SCALABLE: vector.body:
; SCALABLE-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
Expand Down Expand Up @@ -1273,7 +1271,6 @@ define void @load_store_factor6(ptr %p) {
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK: vector.ph:
; CHECK-NEXT: [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
; CHECK: vector.body:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
Expand Down Expand Up @@ -1431,7 +1428,6 @@ define void @load_store_factor6(ptr %p) {
; SCALABLE-NEXT: entry:
; SCALABLE-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; SCALABLE: vector.ph:
; SCALABLE-NEXT: [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
; SCALABLE-NEXT: br label [[VECTOR_BODY:%.*]]
; SCALABLE: vector.body:
; SCALABLE-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
Expand Down Expand Up @@ -1562,7 +1558,6 @@ define void @load_store_factor7(ptr %p) {
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK: vector.ph:
; CHECK-NEXT: [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
; CHECK: vector.body:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
Expand Down Expand Up @@ -1736,7 +1731,6 @@ define void @load_store_factor7(ptr %p) {
; SCALABLE-NEXT: entry:
; SCALABLE-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; SCALABLE: vector.ph:
; SCALABLE-NEXT: [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
; SCALABLE-NEXT: br label [[VECTOR_BODY:%.*]]
; SCALABLE: vector.body:
; SCALABLE-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
Expand Down Expand Up @@ -1880,7 +1874,6 @@ define void @load_store_factor8(ptr %p) {
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK: vector.ph:
; CHECK-NEXT: [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
; CHECK: vector.body:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
Expand Down Expand Up @@ -2067,7 +2060,6 @@ define void @load_store_factor8(ptr %p) {
; SCALABLE-NEXT: entry:
; SCALABLE-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; SCALABLE: vector.ph:
; SCALABLE-NEXT: [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
; SCALABLE-NEXT: br label [[VECTOR_BODY:%.*]]
; SCALABLE: vector.body:
; SCALABLE-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
Expand Down
14 changes: 5 additions & 9 deletions llvm/test/Transforms/LoopVectorize/RISCV/lmul.ll
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Expand Up @@ -12,24 +12,20 @@ define void @load_store(ptr %p) {
; LMUL1-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 1024, [[TMP0]]
; LMUL1-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; LMUL1: vector.ph:
; LMUL1-NEXT: [[TMP1:%.*]] = call i64 @llvm.vscale.i64()
; LMUL1-NEXT: [[N_MOD_VF:%.*]] = urem i64 1024, [[TMP1]]
; LMUL1-NEXT: [[N_VEC:%.*]] = sub i64 1024, [[N_MOD_VF]]
; LMUL1-NEXT: br label [[VECTOR_BODY:%.*]]
; LMUL1: vector.body:
; LMUL1-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; LMUL1-NEXT: [[TMP3:%.*]] = getelementptr inbounds i64, ptr [[P:%.*]], i64 [[INDEX]]
; LMUL1-NEXT: [[WIDE_LOAD:%.*]] = load <vscale x 1 x i64>, ptr [[TMP3]], align 8
; LMUL1-NEXT: [[TMP5:%.*]] = add <vscale x 1 x i64> [[WIDE_LOAD]], splat (i64 1)
; LMUL1-NEXT: store <vscale x 1 x i64> [[TMP5]], ptr [[TMP3]], align 8
; LMUL1-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], [[TMP1]]
; LMUL1-NEXT: [[TMP7:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; LMUL1-NEXT: br i1 [[TMP7]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; LMUL1-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 1
; LMUL1-NEXT: [[TMP4:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1024
; LMUL1-NEXT: br i1 [[TMP4]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; LMUL1: middle.block:
; LMUL1-NEXT: [[CMP_N:%.*]] = icmp eq i64 1024, [[N_VEC]]
; LMUL1-NEXT: br i1 [[CMP_N]], label [[FOR_END:%.*]], label [[SCALAR_PH]]
; LMUL1-NEXT: br i1 true, label [[FOR_END:%.*]], label [[SCALAR_PH]]
; LMUL1: scalar.ph:
; LMUL1-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
; LMUL1-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 1024, [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
; LMUL1-NEXT: br label [[FOR_BODY:%.*]]
; LMUL1: for.body:
; LMUL1-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[FOR_BODY]] ]
Expand Down
1 change: 0 additions & 1 deletion llvm/test/Transforms/LoopVectorize/RISCV/tail-folding-safe-dep-distance.ll
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Expand Up @@ -438,7 +438,6 @@ define void @no_high_lmul_or_interleave(ptr %p) {
; IF-EVL-NEXT: entry:
; IF-EVL-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; IF-EVL: vector.ph:
; IF-EVL-NEXT: [[TMP8:%.*]] = call i64 @llvm.vscale.i64()
; IF-EVL-NEXT: br label [[VECTOR_BODY:%.*]]
; IF-EVL: vector.body:
; IF-EVL-NEXT: [[EVL_BASED_IV:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_EVL_NEXT:%.*]], [[VECTOR_BODY]] ]
Expand Down
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