[llvm] UNFIXED RELAND "[LoopVectorizer] Add support for chaining partial reductions (#120272)" (PR #124199)
via llvm-commits
llvm-commits at lists.llvm.org
Thu Jan 23 14:01:53 PST 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-llvm-transforms
Author: Vitaly Buka (vitalybuka)
<details>
<summary>Changes</summary>
Reverts llvm/llvm-project#<!-- -->124198
---
Patch is 79.11 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/124199.diff
4 Files Affected:
- (modified) llvm/lib/Transforms/Vectorize/LoopVectorize.cpp (+42-22)
- (modified) llvm/lib/Transforms/Vectorize/VPRecipeBuilder.h (+2-2)
- (modified) llvm/lib/Transforms/Vectorize/VPlan.h (+4-1)
- (added) llvm/test/Transforms/LoopVectorize/AArch64/partial-reduce-chained.ll (+1025)
``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index 7167e2179af535..dec7a87ba9c50b 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -8682,12 +8682,12 @@ VPReplicateRecipe *VPRecipeBuilder::handleReplication(Instruction *I,
/// are valid so recipes can be formed later.
void VPRecipeBuilder::collectScaledReductions(VFRange &Range) {
// Find all possible partial reductions.
- SmallVector<std::pair<PartialReductionChain, unsigned>, 1>
+ SmallVector<std::pair<PartialReductionChain, unsigned>>
PartialReductionChains;
- for (const auto &[Phi, RdxDesc] : Legal->getReductionVars())
- if (std::optional<std::pair<PartialReductionChain, unsigned>> Pair =
- getScaledReduction(Phi, RdxDesc, Range))
- PartialReductionChains.push_back(*Pair);
+ for (const auto &[Phi, RdxDesc] : Legal->getReductionVars()) {
+ if (auto SR = getScaledReduction(Phi, RdxDesc.getLoopExitInstr(), Range))
+ PartialReductionChains.append(*SR);
+ }
// A partial reduction is invalid if any of its extends are used by
// something that isn't another partial reduction. This is because the
@@ -8715,26 +8715,44 @@ void VPRecipeBuilder::collectScaledReductions(VFRange &Range) {
}
}
-std::optional<std::pair<PartialReductionChain, unsigned>>
-VPRecipeBuilder::getScaledReduction(PHINode *PHI,
- const RecurrenceDescriptor &Rdx,
+std::optional<SmallVector<std::pair<PartialReductionChain, unsigned>>>
+VPRecipeBuilder::getScaledReduction(Instruction *PHI, Instruction *RdxExitInstr,
VFRange &Range) {
+
+ if (!CM.TheLoop->contains(RdxExitInstr))
+ return std::nullopt;
+
// TODO: Allow scaling reductions when predicating. The select at
// the end of the loop chooses between the phi value and most recent
// reduction result, both of which have different VFs to the active lane
// mask when scaling.
- if (CM.blockNeedsPredicationForAnyReason(Rdx.getLoopExitInstr()->getParent()))
+ if (CM.blockNeedsPredicationForAnyReason(RdxExitInstr->getParent()))
return std::nullopt;
- auto *Update = dyn_cast<BinaryOperator>(Rdx.getLoopExitInstr());
+ auto *Update = dyn_cast<BinaryOperator>(RdxExitInstr);
if (!Update)
return std::nullopt;
Value *Op = Update->getOperand(0);
Value *PhiOp = Update->getOperand(1);
- if (Op == PHI) {
- Op = Update->getOperand(1);
- PhiOp = Update->getOperand(0);
+ if (Op == PHI)
+ std::swap(Op, PhiOp);
+
+ SmallVector<std::pair<PartialReductionChain, unsigned>> Chains;
+
+ // Try and get a scaled reduction from the first non-phi operand.
+ // If one is found, we use the discovered reduction instruction in
+ // place of the accumulator for costing.
+ if (auto *OpInst = dyn_cast<Instruction>(Op)) {
+ if (auto SR0 = getScaledReduction(PHI, OpInst, Range)) {
+ Chains.append(*SR0);
+ PHI = SR0->rbegin()->first.Reduction;
+
+ Op = Update->getOperand(0);
+ PhiOp = Update->getOperand(1);
+ if (Op == PHI)
+ std::swap(Op, PhiOp);
+ }
}
if (PhiOp != PHI)
return std::nullopt;
@@ -8757,7 +8775,7 @@ VPRecipeBuilder::getScaledReduction(PHINode *PHI,
TTI::PartialReductionExtendKind OpBExtend =
TargetTransformInfo::getPartialReductionExtendKind(ExtB);
- PartialReductionChain Chain(Rdx.getLoopExitInstr(), ExtA, ExtB, BinOp);
+ PartialReductionChain Chain(RdxExitInstr, ExtA, ExtB, BinOp);
unsigned TargetScaleFactor =
PHI->getType()->getPrimitiveSizeInBits().getKnownScalarFactor(
@@ -8772,9 +8790,9 @@ VPRecipeBuilder::getScaledReduction(PHINode *PHI,
return Cost.isValid();
},
Range))
- return std::make_pair(Chain, TargetScaleFactor);
+ Chains.push_back(std::make_pair(Chain, TargetScaleFactor));
- return std::nullopt;
+ return Chains;
}
VPRecipeBase *
@@ -8869,12 +8887,14 @@ VPRecipeBuilder::tryToCreatePartialReduction(Instruction *Reduction,
"Unexpected number of operands for partial reduction");
VPValue *BinOp = Operands[0];
- VPValue *Phi = Operands[1];
- if (isa<VPReductionPHIRecipe>(BinOp->getDefiningRecipe()))
- std::swap(BinOp, Phi);
-
- return new VPPartialReductionRecipe(Reduction->getOpcode(), BinOp, Phi,
- Reduction);
+ VPValue *Accumulator = Operands[1];
+ VPRecipeBase *BinOpRecipe = BinOp->getDefiningRecipe();
+ if (isa<VPReductionPHIRecipe>(BinOpRecipe) ||
+ isa<VPPartialReductionRecipe>(BinOpRecipe))
+ std::swap(BinOp, Accumulator);
+
+ return new VPPartialReductionRecipe(Reduction->getOpcode(), BinOp,
+ Accumulator, Reduction);
}
void LoopVectorizationPlanner::buildVPlansWithVPRecipes(ElementCount MinVF,
diff --git a/llvm/lib/Transforms/Vectorize/VPRecipeBuilder.h b/llvm/lib/Transforms/Vectorize/VPRecipeBuilder.h
index 44745bfd46f891..9b1f40d0560bc2 100644
--- a/llvm/lib/Transforms/Vectorize/VPRecipeBuilder.h
+++ b/llvm/lib/Transforms/Vectorize/VPRecipeBuilder.h
@@ -142,8 +142,8 @@ class VPRecipeBuilder {
/// Returns null if no scaled reduction was found, otherwise a pair with a
/// struct containing reduction information and the scaling factor between the
/// number of elements in the input and output.
- std::optional<std::pair<PartialReductionChain, unsigned>>
- getScaledReduction(PHINode *PHI, const RecurrenceDescriptor &Rdx,
+ std::optional<SmallVector<std::pair<PartialReductionChain, unsigned>>>
+ getScaledReduction(Instruction *PHI, Instruction *RdxExitInstr,
VFRange &Range);
public:
diff --git a/llvm/lib/Transforms/Vectorize/VPlan.h b/llvm/lib/Transforms/Vectorize/VPlan.h
index 09da5741d913ab..b52ee3c2428f3f 100644
--- a/llvm/lib/Transforms/Vectorize/VPlan.h
+++ b/llvm/lib/Transforms/Vectorize/VPlan.h
@@ -2455,7 +2455,10 @@ class VPPartialReductionRecipe : public VPSingleDefRecipe {
: VPSingleDefRecipe(VPDef::VPPartialReductionSC,
ArrayRef<VPValue *>({Op0, Op1}), ReductionInst),
Opcode(Opcode) {
- assert(isa<VPReductionPHIRecipe>(getOperand(1)->getDefiningRecipe()) &&
+ [[maybe_unused]] auto *AccumulatorRecipe =
+ getOperand(1)->getDefiningRecipe();
+ assert((isa<VPReductionPHIRecipe>(AccumulatorRecipe) ||
+ isa<VPPartialReductionRecipe>(AccumulatorRecipe)) &&
"Unexpected operand order for partial reduction recipe");
}
~VPPartialReductionRecipe() override = default;
diff --git a/llvm/test/Transforms/LoopVectorize/AArch64/partial-reduce-chained.ll b/llvm/test/Transforms/LoopVectorize/AArch64/partial-reduce-chained.ll
new file mode 100644
index 00000000000000..bedf8b6b3a9b56
--- /dev/null
+++ b/llvm/test/Transforms/LoopVectorize/AArch64/partial-reduce-chained.ll
@@ -0,0 +1,1025 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
+; RUN: opt --mattr=+neon,+dotprod -passes=loop-vectorize -force-vector-interleave=1 -enable-epilogue-vectorization=false -S < %s | FileCheck %s --check-prefixes=CHECK-NEON
+; RUN: opt --mattr=+sve -passes=loop-vectorize -force-vector-interleave=1 -enable-epilogue-vectorization=false -S < %s | FileCheck %s --check-prefixes=CHECK-SVE
+; RUN: opt --mattr=+sve -vectorizer-maximize-bandwidth -passes=loop-vectorize -force-vector-interleave=1 -enable-epilogue-vectorization=false -S < %s | FileCheck %s --check-prefixes=CHECK-SVE-MAXBW
+
+target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
+target triple = "aarch64-none-unknown-elf"
+
+; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) vscale_range(1,16)
+define i32 @chained_partial_reduce_add_sub(ptr %a, ptr %b, ptr %c, i32 %N) #0 {
+; CHECK-NEON-LABEL: define i32 @chained_partial_reduce_add_sub(
+; CHECK-NEON-SAME: ptr [[A:%.*]], ptr [[B:%.*]], ptr [[C:%.*]], i32 [[N:%.*]]) #[[ATTR0:[0-9]+]] {
+; CHECK-NEON-NEXT: entry:
+; CHECK-NEON-NEXT: [[CMP28_NOT:%.*]] = icmp ult i32 [[N]], 2
+; CHECK-NEON-NEXT: [[DIV27:%.*]] = lshr i32 [[N]], 1
+; CHECK-NEON-NEXT: [[WIDE_TRIP_COUNT:%.*]] = zext nneg i32 [[DIV27]] to i64
+; CHECK-NEON-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[WIDE_TRIP_COUNT]], 16
+; CHECK-NEON-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
+; CHECK-NEON: vector.ph:
+; CHECK-NEON-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[WIDE_TRIP_COUNT]], 16
+; CHECK-NEON-NEXT: [[N_VEC:%.*]] = sub i64 [[WIDE_TRIP_COUNT]], [[N_MOD_VF]]
+; CHECK-NEON-NEXT: br label [[VECTOR_BODY:%.*]]
+; CHECK-NEON: vector.body:
+; CHECK-NEON-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
+; CHECK-NEON-NEXT: [[VEC_PHI:%.*]] = phi <16 x i32> [ zeroinitializer, [[VECTOR_PH]] ], [ [[TMP13:%.*]], [[VECTOR_BODY]] ]
+; CHECK-NEON-NEXT: [[TMP0:%.*]] = add i64 [[INDEX]], 0
+; CHECK-NEON-NEXT: [[TMP1:%.*]] = getelementptr inbounds nuw i8, ptr [[A]], i64 [[TMP0]]
+; CHECK-NEON-NEXT: [[TMP2:%.*]] = getelementptr inbounds nuw i8, ptr [[B]], i64 [[TMP0]]
+; CHECK-NEON-NEXT: [[TMP3:%.*]] = getelementptr inbounds nuw i8, ptr [[C]], i64 [[TMP0]]
+; CHECK-NEON-NEXT: [[TMP4:%.*]] = getelementptr inbounds nuw i8, ptr [[TMP1]], i32 0
+; CHECK-NEON-NEXT: [[WIDE_LOAD:%.*]] = load <16 x i8>, ptr [[TMP4]], align 1
+; CHECK-NEON-NEXT: [[TMP5:%.*]] = getelementptr inbounds nuw i8, ptr [[TMP2]], i32 0
+; CHECK-NEON-NEXT: [[WIDE_LOAD1:%.*]] = load <16 x i8>, ptr [[TMP5]], align 1
+; CHECK-NEON-NEXT: [[TMP6:%.*]] = getelementptr inbounds nuw i8, ptr [[TMP3]], i32 0
+; CHECK-NEON-NEXT: [[WIDE_LOAD2:%.*]] = load <16 x i8>, ptr [[TMP6]], align 1
+; CHECK-NEON-NEXT: [[TMP7:%.*]] = sext <16 x i8> [[WIDE_LOAD]] to <16 x i32>
+; CHECK-NEON-NEXT: [[TMP8:%.*]] = sext <16 x i8> [[WIDE_LOAD1]] to <16 x i32>
+; CHECK-NEON-NEXT: [[TMP9:%.*]] = sext <16 x i8> [[WIDE_LOAD2]] to <16 x i32>
+; CHECK-NEON-NEXT: [[TMP10:%.*]] = mul nsw <16 x i32> [[TMP7]], [[TMP8]]
+; CHECK-NEON-NEXT: [[TMP11:%.*]] = add <16 x i32> [[VEC_PHI]], [[TMP10]]
+; CHECK-NEON-NEXT: [[TMP12:%.*]] = mul nsw <16 x i32> [[TMP7]], [[TMP9]]
+; CHECK-NEON-NEXT: [[TMP13]] = sub <16 x i32> [[TMP11]], [[TMP12]]
+; CHECK-NEON-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 16
+; CHECK-NEON-NEXT: [[TMP14:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
+; CHECK-NEON-NEXT: br i1 [[TMP14]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
+; CHECK-NEON: middle.block:
+; CHECK-NEON-NEXT: [[TMP15:%.*]] = call i32 @llvm.vector.reduce.add.v16i32(<16 x i32> [[TMP13]])
+; CHECK-NEON-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[WIDE_TRIP_COUNT]], [[N_VEC]]
+; CHECK-NEON-NEXT: br i1 [[CMP_N]], label [[FOR_COND_CLEANUP:%.*]], label [[SCALAR_PH]]
+;
+; CHECK-SVE-LABEL: define i32 @chained_partial_reduce_add_sub(
+; CHECK-SVE-SAME: ptr [[A:%.*]], ptr [[B:%.*]], ptr [[C:%.*]], i32 [[N:%.*]]) #[[ATTR0:[0-9]+]] {
+; CHECK-SVE-NEXT: entry:
+; CHECK-SVE-NEXT: [[CMP28_NOT:%.*]] = icmp ult i32 [[N]], 2
+; CHECK-SVE-NEXT: [[DIV27:%.*]] = lshr i32 [[N]], 1
+; CHECK-SVE-NEXT: [[WIDE_TRIP_COUNT:%.*]] = zext nneg i32 [[DIV27]] to i64
+; CHECK-SVE-NEXT: [[TMP0:%.*]] = call i64 @llvm.vscale.i64()
+; CHECK-SVE-NEXT: [[TMP1:%.*]] = mul i64 [[TMP0]], 4
+; CHECK-SVE-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[WIDE_TRIP_COUNT]], [[TMP1]]
+; CHECK-SVE-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
+; CHECK-SVE: vector.ph:
+; CHECK-SVE-NEXT: [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
+; CHECK-SVE-NEXT: [[TMP3:%.*]] = mul i64 [[TMP2]], 4
+; CHECK-SVE-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[WIDE_TRIP_COUNT]], [[TMP3]]
+; CHECK-SVE-NEXT: [[N_VEC:%.*]] = sub i64 [[WIDE_TRIP_COUNT]], [[N_MOD_VF]]
+; CHECK-SVE-NEXT: [[TMP4:%.*]] = call i64 @llvm.vscale.i64()
+; CHECK-SVE-NEXT: [[TMP5:%.*]] = mul i64 [[TMP4]], 4
+; CHECK-SVE-NEXT: br label [[VECTOR_BODY:%.*]]
+; CHECK-SVE: vector.body:
+; CHECK-SVE-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
+; CHECK-SVE-NEXT: [[VEC_PHI:%.*]] = phi <vscale x 4 x i32> [ zeroinitializer, [[VECTOR_PH]] ], [ [[TMP19:%.*]], [[VECTOR_BODY]] ]
+; CHECK-SVE-NEXT: [[TMP6:%.*]] = add i64 [[INDEX]], 0
+; CHECK-SVE-NEXT: [[TMP7:%.*]] = getelementptr inbounds nuw i8, ptr [[A]], i64 [[TMP6]]
+; CHECK-SVE-NEXT: [[TMP8:%.*]] = getelementptr inbounds nuw i8, ptr [[B]], i64 [[TMP6]]
+; CHECK-SVE-NEXT: [[TMP9:%.*]] = getelementptr inbounds nuw i8, ptr [[C]], i64 [[TMP6]]
+; CHECK-SVE-NEXT: [[TMP10:%.*]] = getelementptr inbounds nuw i8, ptr [[TMP7]], i32 0
+; CHECK-SVE-NEXT: [[WIDE_LOAD:%.*]] = load <vscale x 4 x i8>, ptr [[TMP10]], align 1
+; CHECK-SVE-NEXT: [[TMP11:%.*]] = getelementptr inbounds nuw i8, ptr [[TMP8]], i32 0
+; CHECK-SVE-NEXT: [[WIDE_LOAD1:%.*]] = load <vscale x 4 x i8>, ptr [[TMP11]], align 1
+; CHECK-SVE-NEXT: [[TMP12:%.*]] = getelementptr inbounds nuw i8, ptr [[TMP9]], i32 0
+; CHECK-SVE-NEXT: [[WIDE_LOAD2:%.*]] = load <vscale x 4 x i8>, ptr [[TMP12]], align 1
+; CHECK-SVE-NEXT: [[TMP13:%.*]] = sext <vscale x 4 x i8> [[WIDE_LOAD]] to <vscale x 4 x i32>
+; CHECK-SVE-NEXT: [[TMP14:%.*]] = sext <vscale x 4 x i8> [[WIDE_LOAD1]] to <vscale x 4 x i32>
+; CHECK-SVE-NEXT: [[TMP15:%.*]] = sext <vscale x 4 x i8> [[WIDE_LOAD2]] to <vscale x 4 x i32>
+; CHECK-SVE-NEXT: [[TMP16:%.*]] = mul nsw <vscale x 4 x i32> [[TMP13]], [[TMP14]]
+; CHECK-SVE-NEXT: [[TMP17:%.*]] = add <vscale x 4 x i32> [[VEC_PHI]], [[TMP16]]
+; CHECK-SVE-NEXT: [[TMP18:%.*]] = mul nsw <vscale x 4 x i32> [[TMP13]], [[TMP15]]
+; CHECK-SVE-NEXT: [[TMP19]] = sub <vscale x 4 x i32> [[TMP17]], [[TMP18]]
+; CHECK-SVE-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], [[TMP5]]
+; CHECK-SVE-NEXT: [[TMP20:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
+; CHECK-SVE-NEXT: br i1 [[TMP20]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
+; CHECK-SVE: middle.block:
+; CHECK-SVE-NEXT: [[TMP21:%.*]] = call i32 @llvm.vector.reduce.add.nxv4i32(<vscale x 4 x i32> [[TMP19]])
+; CHECK-SVE-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[WIDE_TRIP_COUNT]], [[N_VEC]]
+; CHECK-SVE-NEXT: br i1 [[CMP_N]], label [[FOR_COND_CLEANUP:%.*]], label [[SCALAR_PH]]
+;
+; CHECK-SVE-MAXBW-LABEL: define i32 @chained_partial_reduce_add_sub(
+; CHECK-SVE-MAXBW-SAME: ptr [[A:%.*]], ptr [[B:%.*]], ptr [[C:%.*]], i32 [[N:%.*]]) #[[ATTR0:[0-9]+]] {
+; CHECK-SVE-MAXBW-NEXT: entry:
+; CHECK-SVE-MAXBW-NEXT: [[CMP28_NOT:%.*]] = icmp ult i32 [[N]], 2
+; CHECK-SVE-MAXBW-NEXT: [[DIV27:%.*]] = lshr i32 [[N]], 1
+; CHECK-SVE-MAXBW-NEXT: [[WIDE_TRIP_COUNT:%.*]] = zext nneg i32 [[DIV27]] to i64
+; CHECK-SVE-MAXBW-NEXT: [[TMP0:%.*]] = call i64 @llvm.vscale.i64()
+; CHECK-SVE-MAXBW-NEXT: [[TMP1:%.*]] = mul i64 [[TMP0]], 8
+; CHECK-SVE-MAXBW-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[WIDE_TRIP_COUNT]], [[TMP1]]
+; CHECK-SVE-MAXBW-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
+; CHECK-SVE-MAXBW: vector.ph:
+; CHECK-SVE-MAXBW-NEXT: [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
+; CHECK-SVE-MAXBW-NEXT: [[TMP3:%.*]] = mul i64 [[TMP2]], 8
+; CHECK-SVE-MAXBW-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[WIDE_TRIP_COUNT]], [[TMP3]]
+; CHECK-SVE-MAXBW-NEXT: [[N_VEC:%.*]] = sub i64 [[WIDE_TRIP_COUNT]], [[N_MOD_VF]]
+; CHECK-SVE-MAXBW-NEXT: [[TMP4:%.*]] = call i64 @llvm.vscale.i64()
+; CHECK-SVE-MAXBW-NEXT: [[TMP5:%.*]] = mul i64 [[TMP4]], 8
+; CHECK-SVE-MAXBW-NEXT: br label [[VECTOR_BODY:%.*]]
+; CHECK-SVE-MAXBW: vector.body:
+; CHECK-SVE-MAXBW-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
+; CHECK-SVE-MAXBW-NEXT: [[VEC_PHI:%.*]] = phi <vscale x 8 x i32> [ zeroinitializer, [[VECTOR_PH]] ], [ [[TMP19:%.*]], [[VECTOR_BODY]] ]
+; CHECK-SVE-MAXBW-NEXT: [[TMP6:%.*]] = add i64 [[INDEX]], 0
+; CHECK-SVE-MAXBW-NEXT: [[TMP7:%.*]] = getelementptr inbounds nuw i8, ptr [[A]], i64 [[TMP6]]
+; CHECK-SVE-MAXBW-NEXT: [[TMP8:%.*]] = getelementptr inbounds nuw i8, ptr [[B]], i64 [[TMP6]]
+; CHECK-SVE-MAXBW-NEXT: [[TMP9:%.*]] = getelementptr inbounds nuw i8, ptr [[C]], i64 [[TMP6]]
+; CHECK-SVE-MAXBW-NEXT: [[TMP10:%.*]] = getelementptr inbounds nuw i8, ptr [[TMP7]], i32 0
+; CHECK-SVE-MAXBW-NEXT: [[WIDE_LOAD:%.*]] = load <vscale x 8 x i8>, ptr [[TMP10]], align 1
+; CHECK-SVE-MAXBW-NEXT: [[TMP11:%.*]] = getelementptr inbounds nuw i8, ptr [[TMP8]], i32 0
+; CHECK-SVE-MAXBW-NEXT: [[WIDE_LOAD1:%.*]] = load <vscale x 8 x i8>, ptr [[TMP11]], align 1
+; CHECK-SVE-MAXBW-NEXT: [[TMP12:%.*]] = getelementptr inbounds nuw i8, ptr [[TMP9]], i32 0
+; CHECK-SVE-MAXBW-NEXT: [[WIDE_LOAD2:%.*]] = load <vscale x 8 x i8>, ptr [[TMP12]], align 1
+; CHECK-SVE-MAXBW-NEXT: [[TMP13:%.*]] = sext <vscale x 8 x i8> [[WIDE_LOAD]] to <vscale x 8 x i32>
+; CHECK-SVE-MAXBW-NEXT: [[TMP14:%.*]] = sext <vscale x 8 x i8> [[WIDE_LOAD1]] to <vscale x 8 x i32>
+; CHECK-SVE-MAXBW-NEXT: [[TMP15:%.*]] = sext <vscale x 8 x i8> [[WIDE_LOAD2]] to <vscale x 8 x i32>
+; CHECK-SVE-MAXBW-NEXT: [[TMP16:%.*]] = mul nsw <vscale x 8 x i32> [[TMP13]], [[TMP14]]
+; CHECK-SVE-MAXBW-NEXT: [[TMP17:%.*]] = add <vscale x 8 x i32> [[VEC_PHI]], [[TMP16]]
+; CHECK-SVE-MAXBW-NEXT: [[TMP18:%.*]] = mul nsw <vscale x 8 x i32> [[TMP13]], [[TMP15]]
+; CHECK-SVE-MAXBW-NEXT: [[TMP19]] = sub <vscale x 8 x i32> [[TMP17]], [[TMP18]]
+; CHECK-SVE-MAXBW-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], [[TMP5]]
+; CHECK-SVE-MAXBW-NEXT: [[TMP20:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
+; CHECK-SVE-MAXBW-NEXT: br i1 [[TMP20]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
+; CHECK-SVE-MAXBW: middle.block:
+; CHECK-SVE-MAXBW-NEXT: [[TMP21:%.*]] = call i32 @llvm.vector.reduce.add.nxv8i32(<vscale x 8 x i32> [[TMP19]])
+; CHECK-SVE-MAXBW-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[WIDE_TRIP_COUNT]], [[N_VEC]]
+; CHECK-SVE-MAXBW-NEXT: br i1 [[CMP_N]], label [[FOR_COND_CLEANUP:%.*]], label [[SCALAR_PH]]
+;
+entry:
+ %cmp28.not = icmp ult i32 %N, 2
+ %div27 = lshr i32 %N, 1
+ %wide.trip.count = zext nneg i32 %div27 to i64
+ br label %for.body
+
+for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry
+ %res.0.lcssa = phi i32 [ %sub, %for.body ]
+ ret i32 %res.0.lcssa
+
+for.body: ; preds = %for.body.preheader, %for.body
+ %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
+ %res = phi i32 [ 0, %entry ], [ %sub, %for.body ]
+ %a.ptr = getelementptr inbounds nuw i8, ptr %a, i64 %indvars.iv
+ %b.ptr = getelementptr inbounds nuw i8, ptr %b, i64 %indvars.iv
+ %c.ptr = getelementptr inbounds nuw i8, ptr %c, i64 %indvars.iv
+ %a.val = load i8, ptr %a.ptr, align 1
+ %b.val = load i8, ptr %b.ptr, align 1
+ %c.val = load i8, ptr %c.ptr, align 1
+ %a.ext = sext i8 %a.val to i32
+ %b.ext = sext i8 %b.val to i32
+ %c.ext = sext i8 %c.val to i32
+ %mul.ab = mul nsw i32 %a.ext, %b.ext
+ %add = add nsw i32 %res, %mul.ab
+ %mul.ac = mul nsw i32 %a.ext, %c.ext
+ %sub = sub i32 %add, %mul.ac
+ %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+ %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
+ br i1 %exitcond.not, label %for.cond.cleanup, label %for.body, !loop !1
+}
+
+define i32 @chained_partial_reduce_add_add(ptr %a, ptr %b, ptr %c, i32 %N) #0 {
+; CHECK-NEON-LABEL: define i32 @chained_partial_reduce_add_add(
+; CHECK-NEON-SAME: ptr [[A:%.*]], ptr [[B:%.*]], ptr [[C:%.*]], i32 [[N:%.*]]) #[[ATTR0]] {
+; CHECK-NEON-NEXT: entry:
+; CHECK-NEON-NEXT: [[CMP28_NOT:%.*]] = icmp ult i32 [[N]], 2
+; CHECK-NEON-NEXT: [[DIV27:%.*]] = lshr i32 [[N]], 1
+; CHECK-NEON-NEXT: [[WIDE_TRIP_COUNT:%.*]] = zext nneg i32 [[DIV27]] to i64
+; CHECK-NEON-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[WIDE_TRIP_COUNT]], 16
+; CHECK-NEON-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
+; CHECK-NEON: vector.ph:
+; CHECK-NEON-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[WIDE_TRIP_COUNT]], 16
+; CHECK-NEON-NEXT: [[N_VEC:%.*]] = sub i64 [[WIDE_TRIP_COUNT]], [[N_MOD_VF]]
+; CHECK-NEON-NEXT: br label [...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/124199
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