test/Transforms/LoopVectorize/dont-fold-tail-for-divisible-TC.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -loop-vectorize -force-vector-width=4 -S | FileCheck %s

target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"

; Make sure the loop is vectorized under -Os without folding its tail based on
; its trip-count's lower bits known to be zero.

define dso_local void @alignTC(i32* noalias nocapture %A, i32 %n) optsize {
; CHECK-LABEL: @alignTC(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[ALIGNEDTC:%.*]] = and i32 [[N:%.*]], -8
; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[ALIGNEDTC]], 4
; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK:       vector.ph:
; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i32 [[ALIGNEDTC]], 4
; CHECK-NEXT:    [[N_VEC:%.*]] = sub i32 [[ALIGNEDTC]], [[N_MOD_VF]]
; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
; CHECK:       vector.body:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i32> poison, i32 [[INDEX]], i32 0
; CHECK-NEXT:    [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i32> [[BROADCAST_SPLATINSERT]], <4 x i32> poison, <4 x i32> zeroinitializer
; CHECK-NEXT:    [[INDUCTION:%.*]] = add <4 x i32> [[BROADCAST_SPLAT]], <i32 0, i32 1, i32 2, i32 3>
; CHECK-NEXT:    [[TMP0:%.*]] = add i32 [[INDEX]], 0
; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i32, i32* [[A:%.*]], i32 [[TMP0]]
; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr inbounds i32, i32* [[TMP1]], i32 0
; CHECK-NEXT:    [[TMP3:%.*]] = bitcast i32* [[TMP2]] to <4 x i32>*
; CHECK-NEXT:    store <4 x i32> <i32 13, i32 13, i32 13, i32 13>, <4 x i32>* [[TMP3]], align 1
; CHECK-NEXT:    [[INDEX_NEXT]] = add i32 [[INDEX]], 4
; CHECK-NEXT:    [[TMP4:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP4]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], [[LOOP0:!llvm.loop !.*]]
; CHECK:       middle.block:
; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i32 [[ALIGNEDTC]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH]]
; CHECK:       scalar.ph:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[RIV:%.*]] = phi i32 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[RIVPLUS1:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i32, i32* [[A]], i32 [[RIV]]
; CHECK-NEXT:    store i32 13, i32* [[ARRAYIDX]], align 1
; CHECK-NEXT:    [[RIVPLUS1]] = add nuw nsw i32 [[RIV]], 1
; CHECK-NEXT:    [[COND:%.*]] = icmp eq i32 [[RIVPLUS1]], [[ALIGNEDTC]]
; CHECK-NEXT:    br i1 [[COND]], label [[EXIT]], label [[LOOP]], [[LOOP2:!llvm.loop !.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %alignedTC = and i32 %n, -8
  br label %loop

loop:
  %riv = phi i32 [ 0, %entry ], [ %rivPlus1, %loop ]
  %arrayidx = getelementptr inbounds i32, i32* %A, i32 %riv
  store i32 13, i32* %arrayidx, align 1
  %rivPlus1 = add nuw nsw i32 %riv, 1
  %cond = icmp eq i32 %rivPlus1, %alignedTC
  br i1 %cond, label %exit, label %loop

exit:
  ret void
}

; Make sure the loop is vectorized under -Os without folding its tail based on
; its trip-count's lower bits assumed to be zero.

define dso_local void @assumeAlignedTC(i32* noalias nocapture %A, i32 %p, i32 %q) optsize {
; CHECK-LABEL: @assumeAlignedTC(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[AND1:%.*]] = and i32 [[P:%.*]], 3
; CHECK-NEXT:    [[CMP1:%.*]] = icmp eq i32 [[AND1]], 0
; CHECK-NEXT:    br i1 [[CMP1]], label [[GUARDED:%.*]], label [[EXIT:%.*]]
; CHECK:       guarded:
; CHECK-NEXT:    [[REM:%.*]] = urem i32 [[Q:%.*]], 8
; CHECK-NEXT:    [[CMP2:%.*]] = icmp eq i32 [[REM]], 0
; CHECK-NEXT:    tail call void @llvm.assume(i1 [[CMP2]])
; CHECK-NEXT:    [[GT:%.*]] = icmp sgt i32 [[P]], [[Q]]
; CHECK-NEXT:    [[N:%.*]] = select i1 [[GT]], i32 [[P]], i32 [[Q]]
; CHECK-NEXT:    [[CMP110:%.*]] = icmp sgt i32 [[N]], 0
; CHECK-NEXT:    br i1 [[CMP110]], label [[LOOP_PREHEADER:%.*]], label [[EXIT]]
; CHECK:       loop.preheader:
; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[N]], 4
; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK:       vector.ph:
; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i32 [[N]], 4
; CHECK-NEXT:    [[N_VEC:%.*]] = sub i32 [[N]], [[N_MOD_VF]]
; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
; CHECK:       vector.body:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i32> poison, i32 [[INDEX]], i32 0
; CHECK-NEXT:    [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i32> [[BROADCAST_SPLATINSERT]], <4 x i32> poison, <4 x i32> zeroinitializer
; CHECK-NEXT:    [[INDUCTION:%.*]] = add <4 x i32> [[BROADCAST_SPLAT]], <i32 0, i32 1, i32 2, i32 3>
; CHECK-NEXT:    [[TMP0:%.*]] = add i32 [[INDEX]], 0
; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i32, i32* [[A:%.*]], i32 [[TMP0]]
; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr inbounds i32, i32* [[TMP1]], i32 0
; CHECK-NEXT:    [[TMP3:%.*]] = bitcast i32* [[TMP2]] to <4 x i32>*
; CHECK-NEXT:    store <4 x i32> <i32 13, i32 13, i32 13, i32 13>, <4 x i32>* [[TMP3]], align 1
; CHECK-NEXT:    [[INDEX_NEXT]] = add i32 [[INDEX]], 4
; CHECK-NEXT:    [[TMP4:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP4]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], [[LOOP4:!llvm.loop !.*]]
; CHECK:       middle.block:
; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i32 [[N]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT_LOOPEXIT:%.*]], label [[SCALAR_PH]]
; CHECK:       scalar.ph:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[RIV:%.*]] = phi i32 [ [[RIVPLUS1:%.*]], [[LOOP]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i32, i32* [[A]], i32 [[RIV]]
; CHECK-NEXT:    store i32 13, i32* [[ARRAYIDX]], align 1
; CHECK-NEXT:    [[RIVPLUS1]] = add nuw nsw i32 [[RIV]], 1
; CHECK-NEXT:    [[COND:%.*]] = icmp eq i32 [[RIVPLUS1]], [[N]]
; CHECK-NEXT:    br i1 [[COND]], label [[EXIT_LOOPEXIT]], label [[LOOP]], [[LOOP5:!llvm.loop !.*]]
; CHECK:       exit.loopexit:
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %and1 = and i32 %p, 3
  %cmp1 = icmp eq i32 %and1, 0
  br i1 %cmp1, label %guarded, label %exit

guarded:
  %rem = urem i32 %q, 8
  %cmp2 = icmp eq i32 %rem, 0
  tail call void @llvm.assume(i1 %cmp2)
  %gt = icmp sgt i32 %p, %q
  %n = select i1 %gt, i32 %p, i32 %q
  %cmp110 = icmp sgt i32 %n, 0
  br i1 %cmp110, label %loop, label %exit

loop:
  %riv = phi i32 [ 0, %guarded ], [ %rivPlus1, %loop ]
  %arrayidx = getelementptr inbounds i32, i32* %A, i32 %riv
  store i32 13, i32* %arrayidx, align 1
  %rivPlus1 = add nuw nsw i32 %riv, 1
  %cond = icmp eq i32 %rivPlus1, %n
  br i1 %cond, label %exit, label %loop

exit:
  ret void
}

; Make sure the loop's tail is folded when vectorized under -Os based on its trip-count's
; not being provably divisible by chosen VF.

define dso_local void @cannotProveAlignedTC(i32* noalias nocapture %A, i32 %p, i32 %q) optsize {
; CHECK-LABEL: @cannotProveAlignedTC(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[AND1:%.*]] = and i32 [[P:%.*]], 3
; CHECK-NEXT:    [[CMP1:%.*]] = icmp eq i32 [[AND1]], 0
; CHECK-NEXT:    br i1 [[CMP1]], label [[GUARDED:%.*]], label [[EXIT:%.*]]
; CHECK:       guarded:
; CHECK-NEXT:    [[REM:%.*]] = urem i32 [[Q:%.*]], 3
; CHECK-NEXT:    [[CMP2:%.*]] = icmp eq i32 [[REM]], 0
; CHECK-NEXT:    tail call void @llvm.assume(i1 [[CMP2]])
; CHECK-NEXT:    [[GT:%.*]] = icmp sgt i32 [[P]], [[Q]]
; CHECK-NEXT:    [[N:%.*]] = select i1 [[GT]], i32 [[P]], i32 [[Q]]
; CHECK-NEXT:    [[CMP110:%.*]] = icmp sgt i32 [[N]], 0
; CHECK-NEXT:    br i1 [[CMP110]], label [[LOOP_PREHEADER:%.*]], label [[EXIT]]
; CHECK:       loop.preheader:
; CHECK-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK:       vector.ph:
; CHECK-NEXT:    [[N_RND_UP:%.*]] = add i32 [[N]], 3
; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i32 [[N_RND_UP]], 4
; CHECK-NEXT:    [[N_VEC:%.*]] = sub i32 [[N_RND_UP]], [[N_MOD_VF]]
; CHECK-NEXT:    [[TRIP_COUNT_MINUS_1:%.*]] = sub i32 [[N]], 1
; CHECK-NEXT:    [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i32> poison, i32 [[TRIP_COUNT_MINUS_1]], i32 0
; CHECK-NEXT:    [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i32> [[BROADCAST_SPLATINSERT]], <4 x i32> poison, <4 x i32> zeroinitializer
; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
; CHECK:       vector.body:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[PRED_STORE_CONTINUE6:%.*]] ]
; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <4 x i32> [ <i32 0, i32 1, i32 2, i32 3>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[PRED_STORE_CONTINUE6]] ]
; CHECK-NEXT:    [[TMP0:%.*]] = icmp ule <4 x i32> [[VEC_IND]], [[BROADCAST_SPLAT]]
; CHECK-NEXT:    [[TMP1:%.*]] = extractelement <4 x i1> [[TMP0]], i32 0
; CHECK-NEXT:    br i1 [[TMP1]], label [[PRED_STORE_IF:%.*]], label [[PRED_STORE_CONTINUE:%.*]]
; CHECK:       pred.store.if:
; CHECK-NEXT:    [[TMP2:%.*]] = add i32 [[INDEX]], 0
; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr inbounds i32, i32* [[A:%.*]], i32 [[TMP2]]
; CHECK-NEXT:    store i32 13, i32* [[TMP3]], align 1
; CHECK-NEXT:    br label [[PRED_STORE_CONTINUE]]
; CHECK:       pred.store.continue:
; CHECK-NEXT:    [[TMP4:%.*]] = extractelement <4 x i1> [[TMP0]], i32 1
; CHECK-NEXT:    br i1 [[TMP4]], label [[PRED_STORE_IF1:%.*]], label [[PRED_STORE_CONTINUE2:%.*]]
; CHECK:       pred.store.if1:
; CHECK-NEXT:    [[TMP5:%.*]] = add i32 [[INDEX]], 1
; CHECK-NEXT:    [[TMP6:%.*]] = getelementptr inbounds i32, i32* [[A]], i32 [[TMP5]]
; CHECK-NEXT:    store i32 13, i32* [[TMP6]], align 1
; CHECK-NEXT:    br label [[PRED_STORE_CONTINUE2]]
; CHECK:       pred.store.continue2:
; CHECK-NEXT:    [[TMP7:%.*]] = extractelement <4 x i1> [[TMP0]], i32 2
; CHECK-NEXT:    br i1 [[TMP7]], label [[PRED_STORE_IF3:%.*]], label [[PRED_STORE_CONTINUE4:%.*]]
; CHECK:       pred.store.if3:
; CHECK-NEXT:    [[TMP8:%.*]] = add i32 [[INDEX]], 2
; CHECK-NEXT:    [[TMP9:%.*]] = getelementptr inbounds i32, i32* [[A]], i32 [[TMP8]]
; CHECK-NEXT:    store i32 13, i32* [[TMP9]], align 1
; CHECK-NEXT:    br label [[PRED_STORE_CONTINUE4]]
; CHECK:       pred.store.continue4:
; CHECK-NEXT:    [[TMP10:%.*]] = extractelement <4 x i1> [[TMP0]], i32 3
; CHECK-NEXT:    br i1 [[TMP10]], label [[PRED_STORE_IF5:%.*]], label [[PRED_STORE_CONTINUE6]]
; CHECK:       pred.store.if5:
; CHECK-NEXT:    [[TMP11:%.*]] = add i32 [[INDEX]], 3
; CHECK-NEXT:    [[TMP12:%.*]] = getelementptr inbounds i32, i32* [[A]], i32 [[TMP11]]
; CHECK-NEXT:    store i32 13, i32* [[TMP12]], align 1
; CHECK-NEXT:    br label [[PRED_STORE_CONTINUE6]]
; CHECK:       pred.store.continue6:
; CHECK-NEXT:    [[INDEX_NEXT]] = add i32 [[INDEX]], 4
; CHECK-NEXT:    [[VEC_IND_NEXT]] = add <4 x i32> [[VEC_IND]], <i32 4, i32 4, i32 4, i32 4>
; CHECK-NEXT:    [[TMP13:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP13]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], [[LOOP6:!llvm.loop !.*]]
; CHECK:       middle.block:
; CHECK-NEXT:    br i1 true, label [[EXIT_LOOPEXIT:%.*]], label [[SCALAR_PH]]
; CHECK:       scalar.ph:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[RIV:%.*]] = phi i32 [ [[RIVPLUS1:%.*]], [[LOOP]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i32, i32* [[A]], i32 [[RIV]]
; CHECK-NEXT:    store i32 13, i32* [[ARRAYIDX]], align 1
; CHECK-NEXT:    [[RIVPLUS1]] = add nuw nsw i32 [[RIV]], 1
; CHECK-NEXT:    [[COND:%.*]] = icmp eq i32 [[RIVPLUS1]], [[N]]
; CHECK-NEXT:    br i1 [[COND]], label [[EXIT_LOOPEXIT]], label [[LOOP]], [[LOOP7:!llvm.loop !.*]]
; CHECK:       exit.loopexit:
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %and1 = and i32 %p, 3
  %cmp1 = icmp eq i32 %and1, 0
  br i1 %cmp1, label %guarded, label %exit

guarded:
  %rem = urem i32 %q, 3
  %cmp2 = icmp eq i32 %rem, 0
  tail call void @llvm.assume(i1 %cmp2)
  %gt = icmp sgt i32 %p, %q
  %n = select i1 %gt, i32 %p, i32 %q
  %cmp110 = icmp sgt i32 %n, 0
  br i1 %cmp110, label %loop, label %exit

loop:
  %riv = phi i32 [ 0, %guarded ], [ %rivPlus1, %loop ]
  %arrayidx = getelementptr inbounds i32, i32* %A, i32 %riv
  store i32 13, i32* %arrayidx, align 1
  %rivPlus1 = add nuw nsw i32 %riv, 1
  %cond = icmp eq i32 %rivPlus1, %n
  br i1 %cond, label %exit, label %loop

exit:
  ret void
}

declare void @llvm.assume(i1 noundef) nofree nosync nounwind willreturn