llvm/test/Transforms/LoopVectorize/tail-folding-vectorization-factor-1.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=loop-vectorize -force-vector-interleave=4 -tail-folding-policy=prefer-fold-tail -pass-remarks='loop-vectorize' -disable-output -S 2>&1 | FileCheck %s --check-prefix=CHECK-REMARKS
; RUN: opt < %s -passes=loop-vectorize -force-vector-interleave=4 -tail-folding-policy=prefer-fold-tail -S | FileCheck %s

; These tests are to check that fold-tail procedure produces correct scalar code when
; loop-vectorization is only unrolling but not vectorizing.

; CHECK-REMARKS:      remark: {{.*}} interleaved loop (interleaved count: 4)
; CHECK-REMARKS-NEXT: remark: {{.*}} interleaved loop (interleaved count: 4)
; CHECK-REMARKS-NOT:  remark: {{.*}} vectorized loop

define void @VF1-VPlanExe(ptr %dst) {
; CHECK-LABEL: @VF1-VPlanExe(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[VECTOR_PH:%.*]]
; CHECK:       vector.ph:
; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
; CHECK:       vector.body:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[PRED_STORE_CONTINUE6:%.*]] ]
; CHECK-NEXT:    [[TMP1:%.*]] = add i64 [[INDEX]], 1
; CHECK-NEXT:    [[TMP2:%.*]] = add i64 [[INDEX]], 2
; CHECK-NEXT:    [[TMP3:%.*]] = add i64 [[INDEX]], 3
; CHECK-NEXT:    [[TMP4:%.*]] = icmp ule i64 [[INDEX]], 14
; CHECK-NEXT:    [[TMP5:%.*]] = icmp ule i64 [[TMP1]], 14
; CHECK-NEXT:    [[TMP6:%.*]] = icmp ule i64 [[TMP2]], 14
; CHECK-NEXT:    [[TMP7:%.*]] = icmp ule i64 [[TMP3]], 14
; CHECK-NEXT:    br i1 [[TMP4]], label [[PRED_STORE_IF:%.*]], label [[PRED_STORE_CONTINUE:%.*]]
; CHECK:       pred.store.if:
; CHECK-NEXT:    [[TMP8:%.*]] = getelementptr inbounds i32, ptr [[DST:%.*]], i64 [[INDEX]]
; CHECK-NEXT:    store i32 0, ptr [[TMP8]], align 4
; CHECK-NEXT:    br label [[PRED_STORE_CONTINUE]]
; CHECK:       pred.store.continue:
; CHECK-NEXT:    br i1 [[TMP5]], label [[PRED_STORE_IF1:%.*]], label [[PRED_STORE_CONTINUE2:%.*]]
; CHECK:       pred.store.if1:
; CHECK-NEXT:    [[TMP9:%.*]] = getelementptr inbounds i32, ptr [[DST]], i64 [[TMP1]]
; CHECK-NEXT:    store i32 0, ptr [[TMP9]], align 4
; CHECK-NEXT:    br label [[PRED_STORE_CONTINUE2]]
; CHECK:       pred.store.continue2:
; CHECK-NEXT:    br i1 [[TMP6]], label [[PRED_STORE_IF3:%.*]], label [[PRED_STORE_CONTINUE4:%.*]]
; CHECK:       pred.store.if3:
; CHECK-NEXT:    [[TMP10:%.*]] = getelementptr inbounds i32, ptr [[DST]], i64 [[TMP2]]
; CHECK-NEXT:    store i32 0, ptr [[TMP10]], align 4
; CHECK-NEXT:    br label [[PRED_STORE_CONTINUE4]]
; CHECK:       pred.store.continue4:
; CHECK-NEXT:    br i1 [[TMP7]], label [[PRED_STORE_IF5:%.*]], label [[PRED_STORE_CONTINUE6]]
; CHECK:       pred.store.if5:
; CHECK-NEXT:    [[TMP11:%.*]] = getelementptr inbounds i32, ptr [[DST]], i64 [[TMP3]]
; CHECK-NEXT:    store i32 0, ptr [[TMP11]], align 4
; CHECK-NEXT:    br label [[PRED_STORE_CONTINUE6]]
; CHECK:       pred.store.continue6:
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[TMP12:%.*]] = icmp eq i64 [[INDEX_NEXT]], 16
; CHECK-NEXT:    br i1 [[TMP12]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       middle.block:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.cond.cleanup:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.body

for.cond.cleanup:
  ret void

for.body:
  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
  %dst.ptr = getelementptr inbounds i32, ptr %dst, i64 %indvars.iv
  store i32 0, ptr %dst.ptr
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond = icmp eq i64 %indvars.iv.next, 15
  br i1 %exitcond, label %for.cond.cleanup, label %for.body
}

; Note: Most scalar pointer induction GEPs could be sunk into the conditional
;       blocks.
define void @VF1-VPWidenCanonicalIVRecipeExe(ptr %ptr1) {
; CHECK-LABEL: @VF1-VPWidenCanonicalIVRecipeExe(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[PTR2:%.*]] = getelementptr inbounds double, ptr [[PTR1:%.*]], i64 15
; CHECK-NEXT:    br label [[VECTOR_PH:%.*]]
; CHECK:       vector.ph:
; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
; CHECK:       vector.body:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[PRED_STORE_CONTINUE12:%.*]] ]
; CHECK-NEXT:    [[TMP7:%.*]] = add i64 [[INDEX]], 1
; CHECK-NEXT:    [[TMP9:%.*]] = add i64 [[INDEX]], 2
; CHECK-NEXT:    [[TMP10:%.*]] = add i64 [[INDEX]], 3
; CHECK-NEXT:    [[TMP0:%.*]] = icmp ule i64 [[INDEX]], 14
; CHECK-NEXT:    [[TMP1:%.*]] = icmp ule i64 [[TMP7]], 14
; CHECK-NEXT:    [[TMP2:%.*]] = icmp ule i64 [[TMP9]], 14
; CHECK-NEXT:    [[TMP3:%.*]] = icmp ule i64 [[TMP10]], 14
; CHECK-NEXT:    [[OFFSET_IDX:%.*]] = shl i64 [[INDEX]], 3
; CHECK-NEXT:    [[TMP4:%.*]] = add i64 [[OFFSET_IDX]], 8
; CHECK-NEXT:    [[TMP5:%.*]] = add i64 [[OFFSET_IDX]], 16
; CHECK-NEXT:    [[TMP6:%.*]] = add i64 [[OFFSET_IDX]], 24
; CHECK-NEXT:    [[NEXT_GEP:%.*]] = getelementptr i8, ptr [[PTR1]], i64 [[OFFSET_IDX]]
; CHECK-NEXT:    [[NEXT_GEP1:%.*]] = getelementptr i8, ptr [[PTR1]], i64 [[TMP4]]
; CHECK-NEXT:    [[NEXT_GEP2:%.*]] = getelementptr i8, ptr [[PTR1]], i64 [[TMP5]]
; CHECK-NEXT:    [[NEXT_GEP3:%.*]] = getelementptr i8, ptr [[PTR1]], i64 [[TMP6]]
; CHECK-NEXT:    br i1 [[TMP0]], label [[PRED_STORE_IF:%.*]], label [[PRED_STORE_CONTINUE:%.*]]
; CHECK:       pred.store.if:
; CHECK-NEXT:    store double 0.000000e+00, ptr [[NEXT_GEP]], align 8
; CHECK-NEXT:    br label [[PRED_STORE_CONTINUE]]
; CHECK:       pred.store.continue:
; CHECK-NEXT:    br i1 [[TMP1]], label [[PRED_STORE_IF7:%.*]], label [[PRED_STORE_CONTINUE8:%.*]]
; CHECK:       pred.store.if4:
; CHECK-NEXT:    store double 0.000000e+00, ptr [[NEXT_GEP1]], align 8
; CHECK-NEXT:    br label [[PRED_STORE_CONTINUE8]]
; CHECK:       pred.store.continue5:
; CHECK-NEXT:    br i1 [[TMP2]], label [[PRED_STORE_IF9:%.*]], label [[PRED_STORE_CONTINUE10:%.*]]
; CHECK:       pred.store.if6:
; CHECK-NEXT:    store double 0.000000e+00, ptr [[NEXT_GEP2]], align 8
; CHECK-NEXT:    br label [[PRED_STORE_CONTINUE10]]
; CHECK:       pred.store.continue7:
; CHECK-NEXT:    br i1 [[TMP3]], label [[PRED_STORE_IF11:%.*]], label [[PRED_STORE_CONTINUE12]]
; CHECK:       pred.store.if8:
; CHECK-NEXT:    store double 0.000000e+00, ptr [[NEXT_GEP3]], align 8
; CHECK-NEXT:    br label [[PRED_STORE_CONTINUE12]]
; CHECK:       pred.store.continue9:
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[TMP8:%.*]] = icmp eq i64 [[INDEX_NEXT]], 16
; CHECK-NEXT:    br i1 [[TMP8]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK:       middle.block:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.cond.cleanup:
; CHECK-NEXT:    ret void
;
entry:
  %ptr2 = getelementptr inbounds double, ptr %ptr1, i64 15
  br label %for.body

for.cond.cleanup:
  ret void

for.body:
  %addr = phi ptr [ %ptr, %for.body ], [ %ptr1, %entry ]
  store double 0.0, ptr %addr
  %ptr = getelementptr inbounds double, ptr %addr, i64 1
  %cond = icmp eq ptr %ptr, %ptr2
  br i1 %cond, label %for.cond.cleanup, label %for.body
}

define i64 @live_out_scalar_vf(i64 %n) {
; CHECK-LABEL: @live_out_scalar_vf(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[N:%.*]], 1
; CHECK-NEXT:    br label [[VECTOR_PH:%.*]]
; CHECK:       vector.ph:
; CHECK-NEXT:    [[N_RND_UP:%.*]] = add i64 [[TMP0]], 15
; CHECK-NEXT:    [[N_MOD_VF:%.*]] = and i64 [[N_RND_UP]], 15
; CHECK-NEXT:    [[N_VEC:%.*]] = sub i64 [[N_RND_UP]], [[N_MOD_VF]]
; CHECK-NEXT:    [[TRIP_COUNT_MINUS_1:%.*]] = sub i64 [[TMP0]], 1
; CHECK-NEXT:    [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i64> poison, i64 [[TRIP_COUNT_MINUS_1]], i64 0
; CHECK-NEXT:    [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i64> [[BROADCAST_SPLATINSERT]], <4 x i64> poison, <4 x i32> zeroinitializer
; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
; CHECK:       vector.body:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <4 x i64> [ <i64 0, i64 1, i64 2, i64 3>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[VECTOR_RECUR:%.*]] = phi <4 x i64> [ <i64 poison, i64 poison, i64 poison, i64 0>, [[VECTOR_PH]] ], [ [[STEP_ADD_3:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[STEP_ADD:%.*]] = add nuw <4 x i64> [[VEC_IND]], splat (i64 4)
; CHECK-NEXT:    [[STEP_ADD_2:%.*]] = add nuw <4 x i64> [[STEP_ADD]], splat (i64 4)
; CHECK-NEXT:    [[STEP_ADD_3]] = add nuw <4 x i64> [[STEP_ADD_2]], splat (i64 4)
; CHECK-NEXT:    [[TMP1:%.*]] = icmp ugt <4 x i64> [[VEC_IND]], [[BROADCAST_SPLAT]]
; CHECK-NEXT:    [[TMP2:%.*]] = icmp ugt <4 x i64> [[STEP_ADD]], [[BROADCAST_SPLAT]]
; CHECK-NEXT:    [[TMP3:%.*]] = icmp ugt <4 x i64> [[STEP_ADD_2]], [[BROADCAST_SPLAT]]
; CHECK-NEXT:    [[TMP4:%.*]] = icmp ugt <4 x i64> [[STEP_ADD_3]], [[BROADCAST_SPLAT]]
; CHECK-NEXT:    [[INDEX_NEXT]] = add i64 [[INDEX]], 16
; CHECK-NEXT:    [[VEC_IND_NEXT]] = add <4 x i64> [[STEP_ADD_3]], splat (i64 4)
; CHECK-NEXT:    [[TMP5:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP5]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; CHECK:       middle.block:
; CHECK-NEXT:    [[TMP27:%.*]] = shufflevector <4 x i64> [[VECTOR_RECUR]], <4 x i64> [[VEC_IND]], <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; CHECK-NEXT:    [[TMP29:%.*]] = shufflevector <4 x i64> [[VEC_IND]], <4 x i64> [[STEP_ADD]], <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; CHECK-NEXT:    [[TMP31:%.*]] = shufflevector <4 x i64> [[STEP_ADD]], <4 x i64> [[STEP_ADD_2]], <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; CHECK-NEXT:    [[TMP33:%.*]] = shufflevector <4 x i64> [[STEP_ADD_2]], <4 x i64> [[STEP_ADD_3]], <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; CHECK-NEXT:    [[FIRST_INACTIVE_LANE:%.*]] = call i64 @llvm.experimental.cttz.elts.i64.v4i1(<4 x i1> [[TMP4]], i1 false)
; CHECK-NEXT:    [[TMP6:%.*]] = add i64 12, [[FIRST_INACTIVE_LANE]]
; CHECK-NEXT:    [[FIRST_INACTIVE_LANE1:%.*]] = call i64 @llvm.experimental.cttz.elts.i64.v4i1(<4 x i1> [[TMP3]], i1 false)
; CHECK-NEXT:    [[TMP7:%.*]] = add i64 8, [[FIRST_INACTIVE_LANE1]]
; CHECK-NEXT:    [[TMP8:%.*]] = icmp ne i64 [[FIRST_INACTIVE_LANE1]], 4
; CHECK-NEXT:    [[TMP9:%.*]] = select i1 [[TMP8]], i64 [[TMP7]], i64 [[TMP6]]
; CHECK-NEXT:    [[FIRST_INACTIVE_LANE2:%.*]] = call i64 @llvm.experimental.cttz.elts.i64.v4i1(<4 x i1> [[TMP2]], i1 false)
; CHECK-NEXT:    [[TMP10:%.*]] = add i64 4, [[FIRST_INACTIVE_LANE2]]
; CHECK-NEXT:    [[TMP11:%.*]] = icmp ne i64 [[FIRST_INACTIVE_LANE2]], 4
; CHECK-NEXT:    [[TMP12:%.*]] = select i1 [[TMP11]], i64 [[TMP10]], i64 [[TMP9]]
; CHECK-NEXT:    [[FIRST_INACTIVE_LANE3:%.*]] = call i64 @llvm.experimental.cttz.elts.i64.v4i1(<4 x i1> [[TMP1]], i1 false)
; CHECK-NEXT:    [[TMP13:%.*]] = add i64 0, [[FIRST_INACTIVE_LANE3]]
; CHECK-NEXT:    [[TMP14:%.*]] = icmp ne i64 [[FIRST_INACTIVE_LANE3]], 4
; CHECK-NEXT:    [[TMP15:%.*]] = select i1 [[TMP14]], i64 [[TMP13]], i64 [[TMP12]]
; CHECK-NEXT:    [[TMP16:%.*]] = sub i64 [[TMP15]], 1
; CHECK-NEXT:    [[TMP17:%.*]] = extractelement <4 x i64> [[TMP27]], i64 [[TMP16]]
; CHECK-NEXT:    [[TMP18:%.*]] = sub i64 [[TMP16]], 4
; CHECK-NEXT:    [[TMP32:%.*]] = extractelement <4 x i64> [[TMP29]], i64 [[TMP18]]
; CHECK-NEXT:    [[TMP20:%.*]] = icmp uge i64 [[TMP16]], 4
; CHECK-NEXT:    [[TMP21:%.*]] = select i1 [[TMP20]], i64 [[TMP32]], i64 [[TMP17]]
; CHECK-NEXT:    [[TMP22:%.*]] = sub i64 [[TMP16]], 8
; CHECK-NEXT:    [[TMP23:%.*]] = extractelement <4 x i64> [[TMP31]], i64 [[TMP22]]
; CHECK-NEXT:    [[TMP24:%.*]] = icmp uge i64 [[TMP16]], 8
; CHECK-NEXT:    [[TMP25:%.*]] = select i1 [[TMP24]], i64 [[TMP23]], i64 [[TMP21]]
; CHECK-NEXT:    [[TMP26:%.*]] = sub i64 [[TMP16]], 12
; CHECK-NEXT:    [[TMP30:%.*]] = extractelement <4 x i64> [[TMP33]], i64 [[TMP26]]
; CHECK-NEXT:    [[TMP28:%.*]] = icmp uge i64 [[TMP16]], 12
; CHECK-NEXT:    [[TMP19:%.*]] = select i1 [[TMP28]], i64 [[TMP30]], i64 [[TMP25]]
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret i64 [[TMP19]]
;
entry:
  br label %loop

loop:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
  ; Need to use a phi otherwise the header mask will use a
  ; VPWidenCanonicalIVRecipe instead of a VPScalarIVStepsRecipe.
  %exitval = phi i64 [ 0, %entry ], [ %iv, %loop ]
  %iv.next = add i64 %iv, 1
  %ec = icmp eq i64 %iv, %n
  br i1 %ec, label %exit, label %loop

exit:
  ret i64 %exitval
}

;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
; CHECK-REMARKS: {{.*}}