[llvm] 1595994 - [RISCV] Add legality check for vectorizing reduction
via llvm-commits
llvm-commits at lists.llvm.org
Thu May 20 02:46:27 PDT 2021
Author: Luke
Date: 2021-05-20T17:45:46+08:00
New Revision: 1595994b2825a396f650dd8dab8c72a3d71cbc8e
URL: https://github.com/llvm/llvm-project/commit/1595994b2825a396f650dd8dab8c72a3d71cbc8e
DIFF: https://github.com/llvm/llvm-project/commit/1595994b2825a396f650dd8dab8c72a3d71cbc8e.diff
LOG: [RISCV] Add legality check for vectorizing reduction
Check if it is legal to vectorize reduction.
Reviewed By: frasercrmck
Differential Revision: https://reviews.llvm.org/D99509
Added:
llvm/test/Transforms/LoopVectorize/RISCV/scalable-reductions.ll
Modified:
llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h
Removed:
################################################################################
diff --git a/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h b/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h
index 9da0a95808a89..508b5a8ac5f3e 100644
--- a/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h
+++ b/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h
@@ -78,7 +78,7 @@ class RISCVTTIImpl : public BasicTTIImplBase<RISCVTTIImpl> {
TTI::TargetCostKind CostKind,
const Instruction *I);
- bool isLegalElementTypeForRVV(Type *ScalarTy) {
+ bool isLegalElementTypeForRVV(Type *ScalarTy) const {
if (ScalarTy->isPointerTy())
return true;
@@ -139,6 +139,36 @@ class RISCVTTIImpl : public BasicTTIImplBase<RISCVTTIImpl> {
using VPLegalization = TargetTransformInfo::VPLegalization;
return VPLegalization(VPLegalization::Legal, VPLegalization::Legal);
}
+
+ bool isLegalToVectorizeReduction(RecurrenceDescriptor RdxDesc,
+ ElementCount VF) const {
+ if (!ST->hasStdExtV())
+ return false;
+
+ if (!VF.isScalable())
+ return true;
+
+ Type *Ty = RdxDesc.getRecurrenceType();
+ if (!isLegalElementTypeForRVV(Ty))
+ return false;
+
+ switch (RdxDesc.getRecurrenceKind()) {
+ case RecurKind::Add:
+ case RecurKind::FAdd:
+ case RecurKind::And:
+ case RecurKind::Or:
+ case RecurKind::Xor:
+ case RecurKind::SMin:
+ case RecurKind::SMax:
+ case RecurKind::UMin:
+ case RecurKind::UMax:
+ case RecurKind::FMin:
+ case RecurKind::FMax:
+ return true;
+ default:
+ return false;
+ }
+ }
};
} // end namespace llvm
diff --git a/llvm/test/Transforms/LoopVectorize/RISCV/scalable-reductions.ll b/llvm/test/Transforms/LoopVectorize/RISCV/scalable-reductions.ll
new file mode 100644
index 0000000000000..75ebccc46a74b
--- /dev/null
+++ b/llvm/test/Transforms/LoopVectorize/RISCV/scalable-reductions.ll
@@ -0,0 +1,404 @@
+; RUN: opt < %s -loop-vectorize -scalable-vectorization=on \
+; RUN: -riscv-v-vector-bits-min=128 -riscv-v-vector-bits-max=128 \
+; RUN: -pass-remarks=loop-vectorize -pass-remarks-analysis=loop-vectorize \
+; RUN: -pass-remarks-missed=loop-vectorize -mtriple riscv64-linux-gnu \
+; RUN: -mattr=+experimental-v,+f -S 2>%t | FileCheck %s -check-prefix=CHECK
+; RUN: cat %t | FileCheck %s -check-prefix=CHECK-REMARK
+
+; Reduction can be vectorized
+
+; ADD
+
+; CHECK-REMARK: vectorized loop (vectorization width: vscale x 8, interleaved count: 2)
+define i32 @add(i32* nocapture %a, i32* nocapture readonly %b, i64 %n) {
+; CHECK-LABEL: @add
+; CHECK: vector.body:
+; CHECK: %[[LOAD1:.*]] = load <vscale x 8 x i32>
+; CHECK: %[[LOAD2:.*]] = load <vscale x 8 x i32>
+; CHECK: %[[ADD1:.*]] = add <vscale x 8 x i32> %[[LOAD1]]
+; CHECK: %[[ADD2:.*]] = add <vscale x 8 x i32> %[[LOAD2]]
+; CHECK: middle.block:
+; CHECK: %[[ADD:.*]] = add <vscale x 8 x i32> %[[ADD2]], %[[ADD1]]
+; CHECK-NEXT: call i32 @llvm.vector.reduce.add.nxv8i32(<vscale x 8 x i32> %[[ADD]])
+entry:
+ br label %for.body
+
+for.body: ; preds = %entry, %for.body
+ %iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
+ %sum.07 = phi i32 [ 2, %entry ], [ %add, %for.body ]
+ %arrayidx = getelementptr inbounds i32, i32* %a, i64 %iv
+ %0 = load i32, i32* %arrayidx, align 4
+ %add = add nsw i32 %0, %sum.07
+ %iv.next = add nuw nsw i64 %iv, 1
+ %exitcond.not = icmp eq i64 %iv.next, %n
+ br i1 %exitcond.not, label %for.end, label %for.body, !llvm.loop !0
+
+for.end: ; preds = %for.body, %entry
+ ret i32 %add
+}
+
+; OR
+
+; CHECK-REMARK: vectorized loop (vectorization width: vscale x 8, interleaved count: 2)
+define i32 @or(i32* nocapture %a, i32* nocapture readonly %b, i64 %n) {
+; CHECK-LABEL: @or
+; CHECK: vector.body:
+; CHECK: %[[LOAD1:.*]] = load <vscale x 8 x i32>
+; CHECK: %[[LOAD2:.*]] = load <vscale x 8 x i32>
+; CHECK: %[[OR1:.*]] = or <vscale x 8 x i32> %[[LOAD1]]
+; CHECK: %[[OR2:.*]] = or <vscale x 8 x i32> %[[LOAD2]]
+; CHECK: middle.block:
+; CHECK: %[[OR:.*]] = or <vscale x 8 x i32> %[[OR2]], %[[OR1]]
+; CHECK-NEXT: call i32 @llvm.vector.reduce.or.nxv8i32(<vscale x 8 x i32> %[[OR]])
+entry:
+ br label %for.body
+
+for.body: ; preds = %entry, %for.body
+ %iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
+ %sum.07 = phi i32 [ 2, %entry ], [ %or, %for.body ]
+ %arrayidx = getelementptr inbounds i32, i32* %a, i64 %iv
+ %0 = load i32, i32* %arrayidx, align 4
+ %or = or i32 %0, %sum.07
+ %iv.next = add nuw nsw i64 %iv, 1
+ %exitcond.not = icmp eq i64 %iv.next, %n
+ br i1 %exitcond.not, label %for.end, label %for.body, !llvm.loop !0
+
+for.end: ; preds = %for.body, %entry
+ ret i32 %or
+}
+
+; AND
+
+; CHECK-REMARK: vectorized loop (vectorization width: vscale x 8, interleaved count: 2)
+define i32 @and(i32* nocapture %a, i32* nocapture readonly %b, i64 %n) {
+; CHECK-LABEL: @and
+; CHECK: vector.body:
+; CHECK: %[[LOAD1:.*]] = load <vscale x 8 x i32>
+; CHECK: %[[LOAD2:.*]] = load <vscale x 8 x i32>
+; CHECK: %[[AND1:.*]] = and <vscale x 8 x i32> %[[LOAD1]]
+; CHECK: %[[AND2:.*]] = and <vscale x 8 x i32> %[[LOAD2]]
+; CHECK: middle.block:
+; CHECK: %[[ABD:.*]] = and <vscale x 8 x i32> %[[ADD2]], %[[AND1]]
+; CHECK-NEXT: call i32 @llvm.vector.reduce.and.nxv8i32(<vscale x 8 x i32> %[[ADD]])
+entry:
+ br label %for.body
+
+for.body: ; preds = %entry, %for.body
+ %iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
+ %sum.07 = phi i32 [ 2, %entry ], [ %and, %for.body ]
+ %arrayidx = getelementptr inbounds i32, i32* %a, i64 %iv
+ %0 = load i32, i32* %arrayidx, align 4
+ %and = and i32 %0, %sum.07
+ %iv.next = add nuw nsw i64 %iv, 1
+ %exitcond.not = icmp eq i64 %iv.next, %n
+ br i1 %exitcond.not, label %for.end, label %for.body, !llvm.loop !0
+
+for.end: ; preds = %for.body, %entry
+ ret i32 %and
+}
+
+; XOR
+
+; CHECK-REMARK: vectorized loop (vectorization width: vscale x 8, interleaved count: 2)
+define i32 @xor(i32* nocapture %a, i32* nocapture readonly %b, i64 %n) {
+; CHECK-LABEL: @xor
+; CHECK: vector.body:
+; CHECK: %[[LOAD1:.*]] = load <vscale x 8 x i32>
+; CHECK: %[[LOAD2:.*]] = load <vscale x 8 x i32>
+; CHECK: %[[XOR1:.*]] = xor <vscale x 8 x i32> %[[LOAD1]]
+; CHECK: %[[XOR2:.*]] = xor <vscale x 8 x i32> %[[LOAD2]]
+; CHECK: middle.block:
+; CHECK: %[[XOR:.*]] = xor <vscale x 8 x i32> %[[XOR2]], %[[XOR1]]
+; CHECK-NEXT: call i32 @llvm.vector.reduce.xor.nxv8i32(<vscale x 8 x i32> %[[XOR]])
+entry:
+ br label %for.body
+
+for.body: ; preds = %entry, %for.body
+ %iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
+ %sum.07 = phi i32 [ 2, %entry ], [ %xor, %for.body ]
+ %arrayidx = getelementptr inbounds i32, i32* %a, i64 %iv
+ %0 = load i32, i32* %arrayidx, align 4
+ %xor = xor i32 %0, %sum.07
+ %iv.next = add nuw nsw i64 %iv, 1
+ %exitcond.not = icmp eq i64 %iv.next, %n
+ br i1 %exitcond.not, label %for.end, label %for.body, !llvm.loop !0
+
+for.end: ; preds = %for.body, %entry
+ ret i32 %xor
+}
+
+; CHECK-REMARK: vectorized loop (vectorization width: vscale x 8, interleaved count: 2)
+; SMIN
+
+define i32 @smin(i32* nocapture %a, i32* nocapture readonly %b, i64 %n) {
+; CHECK-LABEL: @smin
+; CHECK: vector.body:
+; CHECK: %[[LOAD1:.*]] = load <vscale x 8 x i32>
+; CHECK: %[[LOAD2:.*]] = load <vscale x 8 x i32>
+; CHECK: %[[ICMP1:.*]] = icmp slt <vscale x 8 x i32> %[[LOAD1]]
+; CHECK: %[[ICMP2:.*]] = icmp slt <vscale x 8 x i32> %[[LOAD2]]
+; CHECK: %[[SEL1:.*]] = select <vscale x 8 x i1> %[[ICMP1]], <vscale x 8 x i32> %[[LOAD1]]
+; CHECK: %[[SEL2:.*]] = select <vscale x 8 x i1> %[[ICMP2]], <vscale x 8 x i32> %[[LOAD2]]
+; CHECK: middle.block:
+; CHECK: %[[ICMP:.*]] = icmp slt <vscale x 8 x i32> %[[SEL1]], %[[SEL2]]
+; CHECK-NEXT: %[[SEL:.*]] = select <vscale x 8 x i1> %[[ICMP]], <vscale x 8 x i32> %[[SEL1]], <vscale x 8 x i32> %[[SEL2]]
+; CHECK-NEXT: call i32 @llvm.vector.reduce.smin.nxv8i32(<vscale x 8 x i32> %[[SEL]])
+entry:
+ br label %for.body
+
+for.body: ; preds = %entry, %for.body
+ %iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
+ %sum.010 = phi i32 [ 2, %entry ], [ %.sroa.speculated, %for.body ]
+ %arrayidx = getelementptr inbounds i32, i32* %a, i64 %iv
+ %0 = load i32, i32* %arrayidx, align 4
+ %cmp.i = icmp slt i32 %0, %sum.010
+ %.sroa.speculated = select i1 %cmp.i, i32 %0, i32 %sum.010
+ %iv.next = add nuw nsw i64 %iv, 1
+ %exitcond.not = icmp eq i64 %iv.next, %n
+ br i1 %exitcond.not, label %for.end, label %for.body, !llvm.loop !0
+
+for.end:
+ ret i32 %.sroa.speculated
+}
+
+; CHECK-REMARK: vectorized loop (vectorization width: vscale x 8, interleaved count: 2)
+; UMAX
+
+define i32 @umax(i32* nocapture %a, i32* nocapture readonly %b, i64 %n) {
+; CHECK-LABEL: @umax
+; CHECK: vector.body:
+; CHECK: %[[LOAD1:.*]] = load <vscale x 8 x i32>
+; CHECK: %[[LOAD2:.*]] = load <vscale x 8 x i32>
+; CHECK: %[[ICMP1:.*]] = icmp ugt <vscale x 8 x i32> %[[LOAD1]]
+; CHECK: %[[ICMP2:.*]] = icmp ugt <vscale x 8 x i32> %[[LOAD2]]
+; CHECK: %[[SEL1:.*]] = select <vscale x 8 x i1> %[[ICMP1]], <vscale x 8 x i32> %[[LOAD1]]
+; CHECK: %[[SEL2:.*]] = select <vscale x 8 x i1> %[[ICMP2]], <vscale x 8 x i32> %[[LOAD2]]
+; CHECK: middle.block:
+; CHECK: %[[ICMP:.*]] = icmp ugt <vscale x 8 x i32> %[[SEL1]], %[[SEL2]]
+; CHECK-NEXT: %[[SEL:.*]] = select <vscale x 8 x i1> %[[ICMP]], <vscale x 8 x i32> %[[SEL1]], <vscale x 8 x i32> %[[SEL2]]
+; CHECK-NEXT: call i32 @llvm.vector.reduce.umax.nxv8i32(<vscale x 8 x i32> %[[SEL]])
+entry:
+ br label %for.body
+
+for.body: ; preds = %entry, %for.body
+ %iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
+ %sum.010 = phi i32 [ 2, %entry ], [ %.sroa.speculated, %for.body ]
+ %arrayidx = getelementptr inbounds i32, i32* %a, i64 %iv
+ %0 = load i32, i32* %arrayidx, align 4
+ %cmp.i = icmp ugt i32 %0, %sum.010
+ %.sroa.speculated = select i1 %cmp.i, i32 %0, i32 %sum.010
+ %iv.next = add nuw nsw i64 %iv, 1
+ %exitcond.not = icmp eq i64 %iv.next, %n
+ br i1 %exitcond.not, label %for.end, label %for.body, !llvm.loop !0
+
+for.end:
+ ret i32 %.sroa.speculated
+}
+
+; CHECK-REMARK: vectorized loop (vectorization width: vscale x 8, interleaved count: 2)
+; FADD (FAST)
+
+define float @fadd_fast(float* noalias nocapture readonly %a, i64 %n) {
+; CHECK-LABEL: @fadd_fast
+; CHECK: vector.body:
+; CHECK: %[[LOAD1:.*]] = load <vscale x 8 x float>
+; CHECK: %[[LOAD2:.*]] = load <vscale x 8 x float>
+; CHECK: %[[ADD1:.*]] = fadd fast <vscale x 8 x float> %[[LOAD1]]
+; CHECK: %[[ADD2:.*]] = fadd fast <vscale x 8 x float> %[[LOAD2]]
+; CHECK: middle.block:
+; CHECK: %[[ADD:.*]] = fadd fast <vscale x 8 x float> %[[ADD2]], %[[ADD1]]
+; CHECK-NEXT: call fast float @llvm.vector.reduce.fadd.nxv8f32(float -0.000000e+00, <vscale x 8 x float> %[[ADD]])
+entry:
+ br label %for.body
+
+for.body:
+ %iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
+ %sum.07 = phi float [ 0.000000e+00, %entry ], [ %add, %for.body ]
+ %arrayidx = getelementptr inbounds float, float* %a, i64 %iv
+ %0 = load float, float* %arrayidx, align 4
+ %add = fadd fast float %0, %sum.07
+ %iv.next = add nuw nsw i64 %iv, 1
+ %exitcond.not = icmp eq i64 %iv.next, %n
+ br i1 %exitcond.not, label %for.end, label %for.body, !llvm.loop !0
+
+for.end:
+ ret float %add
+}
+
+; CHECK-REMARK: Scalable vectorization not supported for the reduction operations found in this loop.
+; CHECK-REMARK: vectorized loop (vectorization width: 8, interleaved count: 2)
+define bfloat @fadd_fast_bfloat(bfloat* noalias nocapture readonly %a, i64 %n) {
+; CHECK-LABEL: @fadd_fast_bfloat
+; CHECK: vector.body:
+; CHECK: %[[LOAD1:.*]] = load <8 x bfloat>
+; CHECK: %[[LOAD2:.*]] = load <8 x bfloat>
+; CHECK: %[[FADD1:.*]] = fadd fast <8 x bfloat> %[[LOAD1]]
+; CHECK: %[[FADD2:.*]] = fadd fast <8 x bfloat> %[[LOAD2]]
+; CHECK: middle.block:
+; CHECK: %[[RDX:.*]] = fadd fast <8 x bfloat> %[[FADD2]], %[[FADD1]]
+; CHECK: call fast bfloat @llvm.vector.reduce.fadd.v8bf16(bfloat 0xR8000, <8 x bfloat> %[[RDX]])
+entry:
+ br label %for.body
+
+for.body:
+ %iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
+ %sum.07 = phi bfloat [ 0.000000e+00, %entry ], [ %add, %for.body ]
+ %arrayidx = getelementptr inbounds bfloat, bfloat* %a, i64 %iv
+ %0 = load bfloat, bfloat* %arrayidx, align 4
+ %add = fadd fast bfloat %0, %sum.07
+ %iv.next = add nuw nsw i64 %iv, 1
+ %exitcond.not = icmp eq i64 %iv.next, %n
+ br i1 %exitcond.not, label %for.end, label %for.body, !llvm.loop !0
+
+for.end:
+ ret bfloat %add
+}
+
+; FMIN (FAST)
+
+; CHECK-REMARK: vectorized loop (vectorization width: vscale x 8, interleaved count: 2)
+define float @fmin_fast(float* noalias nocapture readonly %a, i64 %n) #0 {
+; CHECK-LABEL: @fmin_fast
+; CHECK: vector.body:
+; CHECK: %[[LOAD1:.*]] = load <vscale x 8 x float>
+; CHECK: %[[LOAD2:.*]] = load <vscale x 8 x float>
+; CHECK: %[[FCMP1:.*]] = fcmp olt <vscale x 8 x float> %[[LOAD1]]
+; CHECK: %[[FCMP2:.*]] = fcmp olt <vscale x 8 x float> %[[LOAD2]]
+; CHECK: %[[SEL1:.*]] = select <vscale x 8 x i1> %[[FCMP1]], <vscale x 8 x float> %[[LOAD1]]
+; CHECK: %[[SEL2:.*]] = select <vscale x 8 x i1> %[[FCMP2]], <vscale x 8 x float> %[[LOAD2]]
+; CHECK: middle.block:
+; CHECK: %[[FCMP:.*]] = fcmp olt <vscale x 8 x float> %[[SEL1]], %[[SEL2]]
+; CHECK-NEXT: %[[SEL:.*]] = select <vscale x 8 x i1> %[[FCMP]], <vscale x 8 x float> %[[SEL1]], <vscale x 8 x float> %[[SEL2]]
+; CHECK-NEXT: call float @llvm.vector.reduce.fmin.nxv8f32(<vscale x 8 x float> %[[SEL]])
+entry:
+ br label %for.body
+
+for.body:
+ %iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
+ %sum.07 = phi float [ 0.000000e+00, %entry ], [ %.sroa.speculated, %for.body ]
+ %arrayidx = getelementptr inbounds float, float* %a, i64 %iv
+ %0 = load float, float* %arrayidx, align 4
+ %cmp.i = fcmp olt float %0, %sum.07
+ %.sroa.speculated = select i1 %cmp.i, float %0, float %sum.07
+ %iv.next = add nuw nsw i64 %iv, 1
+ %exitcond.not = icmp eq i64 %iv.next, %n
+ br i1 %exitcond.not, label %for.end, label %for.body, !llvm.loop !0
+
+for.end:
+ ret float %.sroa.speculated
+}
+
+; FMAX (FAST)
+
+; CHECK-REMARK: vectorized loop (vectorization width: vscale x 8, interleaved count: 2)
+define float @fmax_fast(float* noalias nocapture readonly %a, i64 %n) #0 {
+; CHECK-LABEL: @fmax_fast
+; CHECK: vector.body:
+; CHECK: %[[LOAD1:.*]] = load <vscale x 8 x float>
+; CHECK: %[[LOAD2:.*]] = load <vscale x 8 x float>
+; CHECK: %[[FCMP1:.*]] = fcmp fast ogt <vscale x 8 x float> %[[LOAD1]]
+; CHECK: %[[FCMP2:.*]] = fcmp fast ogt <vscale x 8 x float> %[[LOAD2]]
+; CHECK: %[[SEL1:.*]] = select <vscale x 8 x i1> %[[FCMP1]], <vscale x 8 x float> %[[LOAD1]]
+; CHECK: %[[SEL2:.*]] = select <vscale x 8 x i1> %[[FCMP2]], <vscale x 8 x float> %[[LOAD2]]
+; CHECK: middle.block:
+; CHECK: %[[FCMP:.*]] = fcmp fast ogt <vscale x 8 x float> %[[SEL1]], %[[SEL2]]
+; CHECK-NEXT: %[[SEL:.*]] = select fast <vscale x 8 x i1> %[[FCMP]], <vscale x 8 x float> %[[SEL1]], <vscale x 8 x float> %[[SEL2]]
+; CHECK-NEXT: call fast float @llvm.vector.reduce.fmax.nxv8f32(<vscale x 8 x float> %[[SEL]])
+entry:
+ br label %for.body
+
+for.body:
+ %iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
+ %sum.07 = phi float [ 0.000000e+00, %entry ], [ %.sroa.speculated, %for.body ]
+ %arrayidx = getelementptr inbounds float, float* %a, i64 %iv
+ %0 = load float, float* %arrayidx, align 4
+ %cmp.i = fcmp fast ogt float %0, %sum.07
+ %.sroa.speculated = select i1 %cmp.i, float %0, float %sum.07
+ %iv.next = add nuw nsw i64 %iv, 1
+ %exitcond.not = icmp eq i64 %iv.next, %n
+ br i1 %exitcond.not, label %for.end, label %for.body, !llvm.loop !0
+
+for.end:
+ ret float %.sroa.speculated
+}
+
+; Reduction cannot be vectorized
+
+; MUL
+
+; CHECK-REMARK: Scalable vectorization not supported for the reduction operations found in this loop.
+; CHECK-REMARK: vectorized loop (vectorization width: 4, interleaved count: 2)
+define i32 @mul(i32* nocapture %a, i32* nocapture readonly %b, i64 %n) {
+; CHECK-LABEL: @mul
+; CHECK: vector.body:
+; CHECK: %[[LOAD1:.*]] = load <4 x i32>
+; CHECK: %[[LOAD2:.*]] = load <4 x i32>
+; CHECK: %[[MUL1:.*]] = mul <4 x i32> %[[LOAD1]]
+; CHECK: %[[MUL2:.*]] = mul <4 x i32> %[[LOAD2]]
+; CHECK: middle.block:
+; CHECK: %[[RDX:.*]] = mul <4 x i32> %[[MUL2]], %[[MUL1]]
+; CHECK: call i32 @llvm.vector.reduce.mul.v4i32(<4 x i32> %[[RDX]])
+entry:
+ br label %for.body
+
+for.body: ; preds = %entry, %for.body
+ %iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
+ %sum.07 = phi i32 [ 2, %entry ], [ %mul, %for.body ]
+ %arrayidx = getelementptr inbounds i32, i32* %a, i64 %iv
+ %0 = load i32, i32* %arrayidx, align 4
+ %mul = mul nsw i32 %0, %sum.07
+ %iv.next = add nuw nsw i64 %iv, 1
+ %exitcond.not = icmp eq i64 %iv.next, %n
+ br i1 %exitcond.not, label %for.end, label %for.body, !llvm.loop !0
+
+for.end: ; preds = %for.body, %entry
+ ret i32 %mul
+}
+
+; Note: This test was added to ensure we always check the legality of reductions (and emit a warning if necessary) before checking for memory dependencies
+; CHECK-REMARK: Scalable vectorization not supported for the reduction operations found in this loop.
+; CHECK-REMARK: vectorized loop (vectorization width: 4, interleaved count: 2)
+define i32 @memory_dependence(i32* noalias nocapture %a, i32* noalias nocapture readonly %b, i64 %n) {
+; CHECK-LABEL: @memory_dependence
+; CHECK: vector.body:
+; CHECK: %[[LOAD1:.*]] = load <4 x i32>
+; CHECK: %[[LOAD2:.*]] = load <4 x i32>
+; CHECK: %[[LOAD3:.*]] = load <4 x i32>
+; CHECK: %[[LOAD4:.*]] = load <4 x i32>
+; CHECK: %[[ADD1:.*]] = add nsw <4 x i32> %[[LOAD3]], %[[LOAD1]]
+; CHECK: %[[ADD2:.*]] = add nsw <4 x i32> %[[LOAD4]], %[[LOAD2]]
+; CHECK: %[[MUL1:.*]] = mul <4 x i32> %[[LOAD3]]
+; CHECK: %[[MUL2:.*]] = mul <4 x i32> %[[LOAD4]]
+; CHECK: middle.block:
+; CHECK: %[[RDX:.*]] = mul <4 x i32> %[[MUL2]], %[[MUL1]]
+; CHECK: call i32 @llvm.vector.reduce.mul.v4i32(<4 x i32> %[[RDX]])
+entry:
+ br label %for.body
+
+for.body:
+ %i = phi i64 [ %inc, %for.body ], [ 0, %entry ]
+ %sum = phi i32 [ %mul, %for.body ], [ 2, %entry ]
+ %arrayidx = getelementptr inbounds i32, i32* %a, i64 %i
+ %0 = load i32, i32* %arrayidx, align 4
+ %arrayidx1 = getelementptr inbounds i32, i32* %b, i64 %i
+ %1 = load i32, i32* %arrayidx1, align 4
+ %add = add nsw i32 %1, %0
+ %add2 = add nuw nsw i64 %i, 32
+ %arrayidx3 = getelementptr inbounds i32, i32* %a, i64 %add2
+ store i32 %add, i32* %arrayidx3, align 4
+ %mul = mul nsw i32 %1, %sum
+ %inc = add nuw nsw i64 %i, 1
+ %exitcond.not = icmp eq i64 %inc, %n
+ br i1 %exitcond.not, label %for.end, label %for.body, !llvm.loop !0
+
+for.end:
+ ret i32 %mul
+}
+
+attributes #0 = { "no-nans-fp-math"="true" "no-signed-zeros-fp-math"="true" }
+
+!0 = distinct !{!0, !1, !2, !3, !4}
+!1 = !{!"llvm.loop.vectorize.width", i32 8}
+!2 = !{!"llvm.loop.vectorize.scalable.enable", i1 true}
+!3 = !{!"llvm.loop.interleave.count", i32 2}
+!4 = !{!"llvm.loop.vectorize.enable", i1 true}
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