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LV]: consider scalable VF during deciding dead epilogue. #156724

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LV]: consider scalable VF during deciding dead epilogue. #156724

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8633fcb
[LV]: Improve accuract of calculating remaining iterations out of Mai…
hassnaaHamdi Sep 3, 2025
8b07999
[LV]: consider scalable VF during deciding dead epilogue.
hassnaaHamdi Sep 3, 2025
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28 changes: 20 additions & 8 deletions llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -4411,8 +4411,21 @@ VectorizationFactor LoopVectorizationPlanner::selectEpilogueVectorizationFactor(
const SCEV *TC =
vputils::getSCEVExprForVPValue(getPlanFor(MainLoopVF).getTripCount(), SE);
assert(!isa<SCEVCouldNotCompute>(TC) && "Trip count SCEV must be computable");

// TODO: Maybe this could be removed when SCEV can evaluate expressions with
// 'vscale'.
// If TC is multiple of vscale, try to get estimated value:
if (match(TC, m_scev_Mul(m_SCEV(), m_SCEVVScale()))) {
std::optional<ElementCount> BestKnownTC =
getSmallBestKnownTC(PSE, OrigLoop);
if (BestKnownTC) {
unsigned EstimatedRuntimeTC =
estimateElementCount(*BestKnownTC, CM.getVScaleForTuning());
TC = SE.getConstant(TCType, EstimatedRuntimeTC);
}
}
RemainingIterations =
SE.getURemExpr(TC, SE.getElementCount(TCType, MainLoopVF * IC));
SE.getURemExpr(TC, SE.getElementCount(TCType, EstimatedRuntimeVF * IC));

// No iterations left to process in the epilogue.
if (RemainingIterations->isZero())
Expand Down Expand Up @@ -4445,13 +4458,12 @@ VectorizationFactor LoopVectorizationPlanner::selectEpilogueVectorizationFactor(

// If NextVF is greater than the number of remaining iterations, the
// epilogue loop would be dead. Skip such factors.
if (RemainingIterations && !NextVF.Width.isScalable()) {
if (SE.isKnownPredicate(
CmpInst::ICMP_UGT,
SE.getConstant(TCType, NextVF.Width.getFixedValue()),
RemainingIterations))
continue;
}
ElementCount EstimatedRuntimeNextVF = ElementCount::getFixed(
estimateElementCount(NextVF.Width, CM.getVScaleForTuning()));
if (SE.isKnownPredicate(CmpInst::ICMP_UGT,
SE.getElementCount(TCType, EstimatedRuntimeNextVF),
RemainingIterations))
continue;

if (Result.Width.isScalar() ||
isMoreProfitable(NextVF, Result, MaxTripCount, !CM.foldTailByMasking()))
Expand Down
144 changes: 21 additions & 123 deletions llvm/test/Transforms/LoopVectorize/AArch64/interleave-with-gaps.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -9,13 +9,8 @@ target triple = "aarch64-linux-gnu"
define i64 @vector_loop_with_remaining_iterations(ptr %src, ptr noalias %dst, i32 %x) #0 {
; CHECK-LABEL: define i64 @vector_loop_with_remaining_iterations(
; CHECK-SAME: ptr [[SRC:%.*]], ptr noalias [[DST:%.*]], i32 [[X:%.*]]) #[[ATTR0:[0-9]+]] {
; CHECK-NEXT: [[ITER_CHECK:.*]]:
; CHECK-NEXT: [[TMP0:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[TMP1:%.*]] = shl nuw i64 [[TMP0]], 1
; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ule i64 17, [[TMP1]]
; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[VEC_EPILOG_SCALAR_PH:.*]], label %[[VECTOR_MAIN_LOOP_ITER_CHECK:.*]]
; CHECK: [[VECTOR_MAIN_LOOP_ITER_CHECK]]:
; CHECK-NEXT: br i1 false, label %[[VEC_EPILOG_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK-NEXT: [[ENTRY:.*]]:
; CHECK-NEXT: br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <16 x i32> poison, i32 [[X]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <16 x i32> [[BROADCAST_SPLATINSERT]], <16 x i32> poison, <16 x i32> zeroinitializer
Expand All @@ -39,60 +34,14 @@ define i64 @vector_loop_with_remaining_iterations(ptr %src, ptr noalias %dst, i3
; CHECK-NEXT: br i1 [[TMP12]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: [[TMP13:%.*]] = call i64 @llvm.vector.reduce.or.v16i64(<16 x i64> [[TMP11]])
; CHECK-NEXT: br label %[[VEC_EPILOG_ITER_CHECK:.*]]
; CHECK: [[VEC_EPILOG_ITER_CHECK]]:
; CHECK-NEXT: [[TMP14:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[TMP15:%.*]] = shl nuw i64 [[TMP14]], 1
; CHECK-NEXT: [[MIN_EPILOG_ITERS_CHECK:%.*]] = icmp ule i64 1, [[TMP15]]
; CHECK-NEXT: br i1 [[MIN_EPILOG_ITERS_CHECK]], label %[[VEC_EPILOG_SCALAR_PH]], label %[[VEC_EPILOG_PH]]
; CHECK: [[VEC_EPILOG_PH]]:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 16, %[[VEC_EPILOG_ITER_CHECK]] ], [ 0, %[[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
; CHECK-NEXT: [[BC_MERGE_RDX:%.*]] = phi i64 [ [[TMP13]], %[[VEC_EPILOG_ITER_CHECK]] ], [ 0, %[[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
; CHECK-NEXT: [[TMP16:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[TMP17:%.*]] = mul nuw i64 [[TMP16]], 2
; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 17, [[TMP17]]
; CHECK-NEXT: [[TMP18:%.*]] = icmp eq i64 [[N_MOD_VF]], 0
; CHECK-NEXT: [[TMP19:%.*]] = select i1 [[TMP18]], i64 [[TMP17]], i64 [[N_MOD_VF]]
; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 17, [[TMP19]]
; CHECK-NEXT: [[BROADCAST_SPLATINSERT1:%.*]] = insertelement <vscale x 2 x i32> poison, i32 [[X]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT2:%.*]] = shufflevector <vscale x 2 x i32> [[BROADCAST_SPLATINSERT1]], <vscale x 2 x i32> poison, <vscale x 2 x i32> zeroinitializer
; CHECK-NEXT: [[TMP22:%.*]] = insertelement <vscale x 2 x i64> zeroinitializer, i64 [[BC_MERGE_RDX]], i32 0
; CHECK-NEXT: [[TMP24:%.*]] = call <vscale x 2 x i32> @llvm.abs.nxv2i32(<vscale x 2 x i32> [[BROADCAST_SPLAT2]], i1 false)
; CHECK-NEXT: [[TMP25:%.*]] = call <vscale x 2 x i64> @llvm.stepvector.nxv2i64()
; CHECK-NEXT: [[BROADCAST_SPLATINSERT3:%.*]] = insertelement <vscale x 2 x i64> poison, i64 [[BC_RESUME_VAL]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT4:%.*]] = shufflevector <vscale x 2 x i64> [[BROADCAST_SPLATINSERT3]], <vscale x 2 x i64> poison, <vscale x 2 x i32> zeroinitializer
; CHECK-NEXT: [[TMP26:%.*]] = mul <vscale x 2 x i64> [[TMP25]], splat (i64 1)
; CHECK-NEXT: [[INDUCTION:%.*]] = add <vscale x 2 x i64> [[BROADCAST_SPLAT4]], [[TMP26]]
; CHECK-NEXT: [[BROADCAST_SPLATINSERT5:%.*]] = insertelement <vscale x 2 x i64> poison, i64 [[TMP17]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT6:%.*]] = shufflevector <vscale x 2 x i64> [[BROADCAST_SPLATINSERT5]], <vscale x 2 x i64> poison, <vscale x 2 x i32> zeroinitializer
; CHECK-NEXT: br label %[[VEC_EPILOG_VECTOR_BODY:.*]]
; CHECK: [[VEC_EPILOG_VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX7:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT9:%.*]], %[[VEC_EPILOG_VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_IND:%.*]] = phi <vscale x 2 x i64> [ [[INDUCTION]], %[[VEC_EPILOG_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VEC_EPILOG_VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_PHI8:%.*]] = phi <vscale x 2 x i64> [ [[TMP22]], %[[VEC_EPILOG_PH]] ], [ [[TMP35:%.*]], %[[VEC_EPILOG_VECTOR_BODY]] ]
; CHECK-NEXT: [[TMP28:%.*]] = getelementptr { [4 x i8] }, ptr [[SRC]], <vscale x 2 x i64> [[VEC_IND]], i32 0, i64 3
; CHECK-NEXT: [[WIDE_MASKED_GATHER:%.*]] = call <vscale x 2 x i8> @llvm.masked.gather.nxv2i8.nxv2p0(<vscale x 2 x ptr> [[TMP28]], i32 1, <vscale x 2 x i1> splat (i1 true), <vscale x 2 x i8> poison)
; CHECK-NEXT: [[TMP29:%.*]] = zext <vscale x 2 x i8> [[WIDE_MASKED_GATHER]] to <vscale x 2 x i32>
; CHECK-NEXT: [[TMP30:%.*]] = call <vscale x 2 x i32> @llvm.umin.nxv2i32(<vscale x 2 x i32> [[TMP24]], <vscale x 2 x i32> [[TMP29]])
; CHECK-NEXT: [[TMP31:%.*]] = call <vscale x 2 x i32> @llvm.umin.nxv2i32(<vscale x 2 x i32> [[TMP24]], <vscale x 2 x i32> [[TMP30]])
; CHECK-NEXT: [[TMP32:%.*]] = getelementptr inbounds i8, ptr [[DST]], i64 [[INDEX7]]
; CHECK-NEXT: store <vscale x 2 x i8> zeroinitializer, ptr [[TMP32]], align 1
; CHECK-NEXT: [[TMP34:%.*]] = zext <vscale x 2 x i32> [[TMP31]] to <vscale x 2 x i64>
; CHECK-NEXT: [[TMP35]] = or <vscale x 2 x i64> [[VEC_PHI8]], [[TMP34]]
; CHECK-NEXT: [[INDEX_NEXT9]] = add nuw i64 [[INDEX7]], [[TMP17]]
; CHECK-NEXT: [[VEC_IND_NEXT]] = add <vscale x 2 x i64> [[VEC_IND]], [[BROADCAST_SPLAT6]]
; CHECK-NEXT: [[TMP36:%.*]] = icmp eq i64 [[INDEX_NEXT9]], [[N_VEC]]
; CHECK-NEXT: br i1 [[TMP36]], label %[[VEC_EPILOG_MIDDLE_BLOCK:.*]], label %[[VEC_EPILOG_VECTOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK: [[VEC_EPILOG_MIDDLE_BLOCK]]:
; CHECK-NEXT: [[TMP37:%.*]] = call i64 @llvm.vector.reduce.or.nxv2i64(<vscale x 2 x i64> [[TMP35]])
; CHECK-NEXT: br label %[[VEC_EPILOG_SCALAR_PH]]
; CHECK: [[VEC_EPILOG_SCALAR_PH]]:
; CHECK-NEXT: [[BC_RESUME_VAL10:%.*]] = phi i64 [ [[N_VEC]], %[[VEC_EPILOG_MIDDLE_BLOCK]] ], [ 16, %[[VEC_EPILOG_ITER_CHECK]] ], [ 0, %[[ITER_CHECK]] ]
; CHECK-NEXT: [[BC_MERGE_RDX11:%.*]] = phi i64 [ [[TMP37]], %[[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[TMP13]], %[[VEC_EPILOG_ITER_CHECK]] ], [ 0, %[[ITER_CHECK]] ]
; CHECK-NEXT: br label %[[SCALAR_PH]]
; CHECK: [[SCALAR_PH]]:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 16, %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT: [[BC_MERGE_RDX:%.*]] = phi i64 [ [[TMP13]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL10]], %[[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[RED:%.*]] = phi i64 [ [[BC_MERGE_RDX11]], %[[VEC_EPILOG_SCALAR_PH]] ], [ [[RED_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[RED:%.*]] = phi i64 [ [[BC_MERGE_RDX]], %[[SCALAR_PH]] ], [ [[RED_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[GEP_SRC_I_I:%.*]] = getelementptr { [4 x i8] }, ptr [[SRC]], i64 [[IV]], i32 0, i64 3
; CHECK-NEXT: [[L:%.*]] = load i8, ptr [[GEP_SRC_I_I]], align 1
; CHECK-NEXT: [[L_EXT:%.*]] = zext i8 [[L]] to i32
Expand All @@ -106,7 +55,7 @@ define i64 @vector_loop_with_remaining_iterations(ptr %src, ptr noalias %dst, i3
; CHECK-NEXT: [[RED_NEXT]] = or i64 [[RED]], [[MIN_EXT]]
; CHECK-NEXT: [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT: [[EXITCOND_NOT_I_I:%.*]] = icmp eq i64 [[IV_NEXT]], 17
; CHECK-NEXT: br i1 [[EXITCOND_NOT_I_I]], label %[[EXIT:.*]], label %[[LOOP]], !llvm.loop [[LOOP4:![0-9]+]]
; CHECK-NEXT: br i1 [[EXITCOND_NOT_I_I]], label %[[EXIT:.*]], label %[[LOOP]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: [[RED_NEXT_LCSSA:%.*]] = phi i64 [ [[RED_NEXT]], %[[LOOP]] ]
; CHECK-NEXT: ret i64 [[RED_NEXT_LCSSA]]
Expand Down Expand Up @@ -142,13 +91,8 @@ exit:
define i64 @main_vector_loop_fixed_with_no_remaining_iterations(ptr %src, ptr noalias %dst, i32 %x) #0 {
; CHECK-LABEL: define i64 @main_vector_loop_fixed_with_no_remaining_iterations(
; CHECK-SAME: ptr [[SRC:%.*]], ptr noalias [[DST:%.*]], i32 [[X:%.*]]) #[[ATTR0]] {
; CHECK-NEXT: [[ITER_CHECK:.*]]:
; CHECK-NEXT: [[TMP0:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[TMP1:%.*]] = shl nuw i64 [[TMP0]], 1
; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ule i64 17, [[TMP1]]
; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[VEC_EPILOG_SCALAR_PH:.*]], label %[[VECTOR_MAIN_LOOP_ITER_CHECK:.*]]
; CHECK: [[VECTOR_MAIN_LOOP_ITER_CHECK]]:
; CHECK-NEXT: br i1 false, label %[[VEC_EPILOG_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK-NEXT: [[ENTRY:.*]]:
; CHECK-NEXT: br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <16 x i32> poison, i32 [[X]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <16 x i32> [[BROADCAST_SPLATINSERT]], <16 x i32> poison, <16 x i32> zeroinitializer
Expand All @@ -169,63 +113,17 @@ define i64 @main_vector_loop_fixed_with_no_remaining_iterations(ptr %src, ptr no
; CHECK-NEXT: [[TMP11]] = or <16 x i64> [[VEC_PHI]], [[TMP10]]
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 16
; CHECK-NEXT: [[TMP12:%.*]] = icmp eq i64 [[INDEX_NEXT]], 16
; CHECK-NEXT: br i1 [[TMP12]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP5:![0-9]+]]
; CHECK-NEXT: br i1 [[TMP12]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: [[TMP13:%.*]] = call i64 @llvm.vector.reduce.or.v16i64(<16 x i64> [[TMP11]])
; CHECK-NEXT: br label %[[VEC_EPILOG_ITER_CHECK:.*]]
; CHECK: [[VEC_EPILOG_ITER_CHECK]]:
; CHECK-NEXT: [[TMP14:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[TMP15:%.*]] = shl nuw i64 [[TMP14]], 1
; CHECK-NEXT: [[MIN_EPILOG_ITERS_CHECK:%.*]] = icmp ule i64 1, [[TMP15]]
; CHECK-NEXT: br i1 [[MIN_EPILOG_ITERS_CHECK]], label %[[VEC_EPILOG_SCALAR_PH]], label %[[VEC_EPILOG_PH]]
; CHECK: [[VEC_EPILOG_PH]]:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 16, %[[VEC_EPILOG_ITER_CHECK]] ], [ 0, %[[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
; CHECK-NEXT: [[BC_MERGE_RDX:%.*]] = phi i64 [ [[TMP13]], %[[VEC_EPILOG_ITER_CHECK]] ], [ 0, %[[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
; CHECK-NEXT: [[TMP16:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[TMP17:%.*]] = mul nuw i64 [[TMP16]], 2
; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 17, [[TMP17]]
; CHECK-NEXT: [[TMP18:%.*]] = icmp eq i64 [[N_MOD_VF]], 0
; CHECK-NEXT: [[TMP19:%.*]] = select i1 [[TMP18]], i64 [[TMP17]], i64 [[N_MOD_VF]]
; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 17, [[TMP19]]
; CHECK-NEXT: [[BROADCAST_SPLATINSERT1:%.*]] = insertelement <vscale x 2 x i32> poison, i32 [[X]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT2:%.*]] = shufflevector <vscale x 2 x i32> [[BROADCAST_SPLATINSERT1]], <vscale x 2 x i32> poison, <vscale x 2 x i32> zeroinitializer
; CHECK-NEXT: [[TMP22:%.*]] = insertelement <vscale x 2 x i64> zeroinitializer, i64 [[BC_MERGE_RDX]], i32 0
; CHECK-NEXT: [[TMP24:%.*]] = call <vscale x 2 x i32> @llvm.abs.nxv2i32(<vscale x 2 x i32> [[BROADCAST_SPLAT2]], i1 false)
; CHECK-NEXT: [[TMP25:%.*]] = call <vscale x 2 x i64> @llvm.stepvector.nxv2i64()
; CHECK-NEXT: [[BROADCAST_SPLATINSERT3:%.*]] = insertelement <vscale x 2 x i64> poison, i64 [[BC_RESUME_VAL]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT4:%.*]] = shufflevector <vscale x 2 x i64> [[BROADCAST_SPLATINSERT3]], <vscale x 2 x i64> poison, <vscale x 2 x i32> zeroinitializer
; CHECK-NEXT: [[TMP38:%.*]] = mul <vscale x 2 x i64> [[TMP25]], splat (i64 1)
; CHECK-NEXT: [[INDUCTION:%.*]] = add <vscale x 2 x i64> [[BROADCAST_SPLAT4]], [[TMP38]]
; CHECK-NEXT: [[BROADCAST_SPLATINSERT5:%.*]] = insertelement <vscale x 2 x i64> poison, i64 [[TMP17]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT6:%.*]] = shufflevector <vscale x 2 x i64> [[BROADCAST_SPLATINSERT5]], <vscale x 2 x i64> poison, <vscale x 2 x i32> zeroinitializer
; CHECK-NEXT: br label %[[VEC_EPILOG_VECTOR_BODY:.*]]
; CHECK: [[VEC_EPILOG_VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX7:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT9:%.*]], %[[VEC_EPILOG_VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_IND:%.*]] = phi <vscale x 2 x i64> [ [[INDUCTION]], %[[VEC_EPILOG_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VEC_EPILOG_VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_PHI8:%.*]] = phi <vscale x 2 x i64> [ [[TMP22]], %[[VEC_EPILOG_PH]] ], [ [[TMP35:%.*]], %[[VEC_EPILOG_VECTOR_BODY]] ]
; CHECK-NEXT: [[TMP28:%.*]] = getelementptr { [4 x i8] }, ptr [[SRC]], <vscale x 2 x i64> [[VEC_IND]], i32 0, i64 3
; CHECK-NEXT: [[WIDE_MASKED_GATHER:%.*]] = call <vscale x 2 x i8> @llvm.masked.gather.nxv2i8.nxv2p0(<vscale x 2 x ptr> [[TMP28]], i32 1, <vscale x 2 x i1> splat (i1 true), <vscale x 2 x i8> poison)
; CHECK-NEXT: [[TMP29:%.*]] = zext <vscale x 2 x i8> [[WIDE_MASKED_GATHER]] to <vscale x 2 x i32>
; CHECK-NEXT: [[TMP30:%.*]] = call <vscale x 2 x i32> @llvm.umin.nxv2i32(<vscale x 2 x i32> [[TMP24]], <vscale x 2 x i32> [[TMP29]])
; CHECK-NEXT: [[TMP31:%.*]] = call <vscale x 2 x i32> @llvm.umin.nxv2i32(<vscale x 2 x i32> [[TMP24]], <vscale x 2 x i32> [[TMP30]])
; CHECK-NEXT: [[TMP32:%.*]] = getelementptr inbounds i8, ptr [[DST]], i64 [[INDEX7]]
; CHECK-NEXT: store <vscale x 2 x i8> zeroinitializer, ptr [[TMP32]], align 1
; CHECK-NEXT: [[TMP34:%.*]] = zext <vscale x 2 x i32> [[TMP31]] to <vscale x 2 x i64>
; CHECK-NEXT: [[TMP35]] = or <vscale x 2 x i64> [[VEC_PHI8]], [[TMP34]]
; CHECK-NEXT: [[INDEX_NEXT9]] = add nuw i64 [[INDEX7]], [[TMP17]]
; CHECK-NEXT: [[VEC_IND_NEXT]] = add <vscale x 2 x i64> [[VEC_IND]], [[BROADCAST_SPLAT6]]
; CHECK-NEXT: [[TMP36:%.*]] = icmp eq i64 [[INDEX_NEXT9]], [[N_VEC]]
; CHECK-NEXT: br i1 [[TMP36]], label %[[VEC_EPILOG_MIDDLE_BLOCK:.*]], label %[[VEC_EPILOG_VECTOR_BODY]], !llvm.loop [[LOOP6:![0-9]+]]
; CHECK: [[VEC_EPILOG_MIDDLE_BLOCK]]:
; CHECK-NEXT: [[TMP37:%.*]] = call i64 @llvm.vector.reduce.or.nxv2i64(<vscale x 2 x i64> [[TMP35]])
; CHECK-NEXT: br label %[[VEC_EPILOG_SCALAR_PH]]
; CHECK: [[VEC_EPILOG_SCALAR_PH]]:
; CHECK-NEXT: [[BC_RESUME_VAL10:%.*]] = phi i64 [ [[N_VEC]], %[[VEC_EPILOG_MIDDLE_BLOCK]] ], [ 16, %[[VEC_EPILOG_ITER_CHECK]] ], [ 0, %[[ITER_CHECK]] ]
; CHECK-NEXT: [[BC_MERGE_RDX11:%.*]] = phi i64 [ [[TMP37]], %[[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[TMP13]], %[[VEC_EPILOG_ITER_CHECK]] ], [ 0, %[[ITER_CHECK]] ]
; CHECK-NEXT: br label %[[SCALAR_PH]]
; CHECK: [[SCALAR_PH]]:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 16, %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT: [[BC_MERGE_RDX:%.*]] = phi i64 [ [[TMP13]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL10]], %[[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[RED:%.*]] = phi i64 [ [[BC_MERGE_RDX11]], %[[VEC_EPILOG_SCALAR_PH]] ], [ [[RED_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[RED:%.*]] = phi i64 [ [[BC_MERGE_RDX]], %[[SCALAR_PH]] ], [ [[RED_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT: [[GEP_SRC_I_I:%.*]] = getelementptr { [4 x i8] }, ptr [[SRC]], i64 [[IV]], i32 0, i64 3
; CHECK-NEXT: [[L:%.*]] = load i8, ptr [[GEP_SRC_I_I]], align 1
; CHECK-NEXT: [[L_EXT:%.*]] = zext i8 [[L]] to i32
Expand All @@ -239,7 +137,7 @@ define i64 @main_vector_loop_fixed_with_no_remaining_iterations(ptr %src, ptr no
; CHECK-NEXT: [[RED_NEXT]] = or i64 [[RED]], [[MIN_EXT]]
; CHECK-NEXT: [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT: [[EXITCOND_NOT_I_I:%.*]] = icmp eq i64 [[IV_NEXT]], 17
; CHECK-NEXT: br i1 [[EXITCOND_NOT_I_I]], label %[[EXIT:.*]], label %[[LOOP]], !llvm.loop [[LOOP7:![0-9]+]]
; CHECK-NEXT: br i1 [[EXITCOND_NOT_I_I]], label %[[EXIT:.*]], label %[[LOOP]], !llvm.loop [[LOOP5:![0-9]+]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: [[RED_NEXT_LCSSA:%.*]] = phi i64 [ [[RED_NEXT]], %[[LOOP]] ]
; CHECK-NEXT: ret i64 [[RED_NEXT_LCSSA]]
Expand Down Expand Up @@ -312,7 +210,7 @@ define void @main_vector_loop_fixed_single_vector_iteration_with_runtime_checks(
; CHECK-NEXT: store i64 0, ptr [[L]], align 8
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT: [[TMP14:%.*]] = icmp eq i64 [[INDEX_NEXT]], 4
; CHECK-NEXT: br i1 [[TMP14]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP8:![0-9]+]]
; CHECK-NEXT: br i1 [[TMP14]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP6:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: br label %[[SCALAR_PH]]
; CHECK: [[SCALAR_PH]]:
Expand All @@ -337,7 +235,7 @@ define void @main_vector_loop_fixed_single_vector_iteration_with_runtime_checks(
; CHECK-NEXT: store i64 0, ptr [[L]], align 8
; CHECK-NEXT: [[IV_NEXT]] = add i64 [[IV1]], 2
; CHECK-NEXT: [[EC:%.*]] = icmp ult i64 [[IV1]], 14
; CHECK-NEXT: br i1 [[EC]], label %[[LOOP]], label %[[EXIT:.*]], !llvm.loop [[LOOP10:![0-9]+]]
; CHECK-NEXT: br i1 [[EC]], label %[[LOOP]], label %[[EXIT:.*]], !llvm.loop [[LOOP8:![0-9]+]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: ret void
;
Expand Down
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