llvm/test/Transforms/LoopVectorize/AArch64/sve-tail-folding-forced.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; REQUIRES: asserts
; RUN: opt -S -passes=loop-vectorize -debug-only=loop-vectorize < %s 2>%t | FileCheck %s
; RUN: cat %t | FileCheck %s --check-prefix=VPLANS

; These tests ensure that tail-folding is enabled when the predicate.enable
; loop attribute is set to true.

target triple = "aarch64-unknown-linux-gnu"

; VPLANS-LABEL: Checking a loop in 'simple_memset'
; VPLANS:      VPlan 'Initial VPlan for VF={vscale x 1,vscale x 2,vscale x 4},UF>=1' {
; VPLANS-NEXT: vp<[[TC:%[0-9]+]]> = original trip-count
; VPLANS-EMPTY:
; VPLANS-NEXT: ph:
; VPLANS-NEXT:  EMIT vp<[[TC]]> = EXPAND SCEV (1 umax %n)
; VPLANS-NEXT: No successors
; VPLANS-EMPTY:
; VPLANS-NEXT: vector.ph:
; VPLANS-NEXT:   EMIT vp<[[VF:%[0-9]+]]> = VF * Part +  ir<0>
; VPLANS-NEXT:   EMIT vp<[[NEWTC:%[0-9]+]]> = TC > VF ? TC - VF : 0 vp<[[TC]]>
; VPLANS-NEXT:   EMIT vp<[[LANEMASK_ENTRY:%[0-9]+]]> = active lane mask vp<[[VF]]> vp<[[TC]]>
; VPLANS-NEXT: Successor(s): vector loop
; VPLANS-EMPTY:
; VPLANS-NEXT: <x1> vector loop: {
; VPLANS-NEXT:   vector.body:
; VPLANS-NEXT:     EMIT vp<[[INDV:%[0-9]+]]> = CANONICAL-INDUCTION
; VPLANS-NEXT:     ACTIVE-LANE-MASK-PHI vp<[[LANEMASK_PHI:%[0-9]+]]> = phi vp<[[LANEMASK_ENTRY]]>, vp<[[LANEMASK_LOOP:%[0-9]+]]>
; VPLANS-NEXT:     vp<[[STEP:%[0-9]+]]>    = SCALAR-STEPS vp<[[INDV]]>, ir<1>
; VPLANS-NEXT:     CLONE ir<%gep> = getelementptr ir<%ptr>, vp<[[STEP]]>
; VPLANS-NEXT:     WIDEN store ir<%gep>, ir<%val>, vp<[[LANEMASK_PHI]]>
; VPLANS-NEXT:     EMIT vp<[[INC:%[0-9]+]]> = VF * Part +  vp<[[INDV]]>
; VPLANS-NEXT:     EMIT vp<[[LANEMASK_LOOP]]> = active lane mask vp<[[INC]]> vp<[[NEWTC]]>
; VPLANS-NEXT:     EMIT vp<[[INDV_UPDATE:%[0-9]+]]> = VF * UF +  vp<[[INDV]]>
; VPLANS-NEXT:     EMIT vp<[[NOT:%[0-9]+]]> = not vp<[[LANEMASK_LOOP]]>
; VPLANS-NEXT:     EMIT branch-on-cond vp<[[NOT]]>
; VPLANS-NEXT:   No successors
; VPLANS-NEXT: }

define void @simple_memset(i32 %val, ptr %ptr, i64 %n) #0 {
; CHECK-LABEL: @simple_memset(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[UMAX:%.*]] = call i64 @llvm.umax.i64(i64 [[N:%.*]], i64 1)
; CHECK-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK:       vector.ph:
; CHECK-NEXT:    [[TMP0:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT:    [[TMP1:%.*]] = mul i64 [[TMP0]], 4
; CHECK-NEXT:    [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT:    [[TMP3:%.*]] = mul i64 [[TMP2]], 4
; CHECK-NEXT:    [[TMP4:%.*]] = sub i64 [[TMP3]], 1
; CHECK-NEXT:    [[N_RND_UP:%.*]] = add i64 [[UMAX]], [[TMP4]]
; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i64 [[N_RND_UP]], [[TMP1]]
; CHECK-NEXT:    [[N_VEC:%.*]] = sub i64 [[N_RND_UP]], [[N_MOD_VF]]
; CHECK-NEXT:    [[TMP5:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT:    [[TMP6:%.*]] = mul i64 [[TMP5]], 4
; CHECK-NEXT:    [[TMP7:%.*]] = sub i64 [[UMAX]], [[TMP6]]
; CHECK-NEXT:    [[TMP8:%.*]] = icmp ugt i64 [[UMAX]], [[TMP6]]
; CHECK-NEXT:    [[TMP9:%.*]] = select i1 [[TMP8]], i64 [[TMP7]], i64 0
; CHECK-NEXT:    [[ACTIVE_LANE_MASK_ENTRY:%.*]] = call <vscale x 4 x i1> @llvm.get.active.lane.mask.nxv4i1.i64(i64 0, i64 [[UMAX]])
; CHECK-NEXT:    [[BROADCAST_SPLATINSERT:%.*]] = insertelement <vscale x 4 x i32> poison, i32 [[VAL:%.*]], i64 0
; CHECK-NEXT:    [[BROADCAST_SPLAT:%.*]] = shufflevector <vscale x 4 x i32> [[BROADCAST_SPLATINSERT]], <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
; CHECK:       vector.body:
; CHECK-NEXT:    [[INDEX1:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT2:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[ACTIVE_LANE_MASK:%.*]] = phi <vscale x 4 x i1> [ [[ACTIVE_LANE_MASK_ENTRY]], [[VECTOR_PH]] ], [ [[ACTIVE_LANE_MASK_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[TMP10:%.*]] = add i64 [[INDEX1]], 0
; CHECK-NEXT:    [[TMP11:%.*]] = getelementptr i32, ptr [[PTR:%.*]], i64 [[TMP10]]
; CHECK-NEXT:    [[TMP12:%.*]] = getelementptr i32, ptr [[TMP11]], i32 0
; CHECK-NEXT:    call void @llvm.masked.store.nxv4i32.p0(<vscale x 4 x i32> [[BROADCAST_SPLAT]], ptr [[TMP12]], i32 4, <vscale x 4 x i1> [[ACTIVE_LANE_MASK]])
; CHECK-NEXT:    [[ACTIVE_LANE_MASK_NEXT]] = call <vscale x 4 x i1> @llvm.get.active.lane.mask.nxv4i1.i64(i64 [[INDEX1]], i64 [[TMP9]])
; CHECK-NEXT:    [[TMP13:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT:    [[TMP14:%.*]] = mul i64 [[TMP13]], 4
; CHECK-NEXT:    [[INDEX_NEXT2]] = add i64 [[INDEX1]], [[TMP14]]
; CHECK-NEXT:    [[TMP15:%.*]] = xor <vscale x 4 x i1> [[ACTIVE_LANE_MASK_NEXT]], shufflevector (<vscale x 4 x i1> insertelement (<vscale x 4 x i1> poison, i1 true, i64 0), <vscale x 4 x i1> poison, <vscale x 4 x i32> zeroinitializer)
; CHECK-NEXT:    [[TMP16:%.*]] = extractelement <vscale x 4 x i1> [[TMP15]], i32 0
; CHECK-NEXT:    br i1 [[TMP16]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       middle.block:
; CHECK-NEXT:    br i1 true, label [[WHILE_END_LOOPEXIT:%.*]], label [[SCALAR_PH]]
; CHECK:       scalar.ph:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    br label [[WHILE_BODY:%.*]]
; CHECK:       while.body:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ [[INDEX_NEXT:%.*]], [[WHILE_BODY]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i32, ptr [[PTR]], i64 [[INDEX]]
; CHECK-NEXT:    store i32 [[VAL]], ptr [[GEP]], align 4
; CHECK-NEXT:    [[INDEX_NEXT]] = add nsw i64 [[INDEX]], 1
; CHECK-NEXT:    [[CMP10:%.*]] = icmp ult i64 [[INDEX_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[CMP10]], label [[WHILE_BODY]], label [[WHILE_END_LOOPEXIT]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK:       while.end.loopexit:
; CHECK-NEXT:    ret void
;
entry:
  br label %while.body

while.body:                                       ; preds = %while.body, %entry
  %index = phi i64 [ %index.next, %while.body ], [ 0, %entry ]
  %gep = getelementptr i32, ptr %ptr, i64 %index
  store i32 %val, ptr %gep
  %index.next = add nsw i64 %index, 1
  %cmp10 = icmp ult i64 %index.next, %n
  br i1 %cmp10, label %while.body, label %while.end.loopexit, !llvm.loop !0

while.end.loopexit:                               ; preds = %while.body
  ret void
}


attributes #0 = { "target-features"="+sve" }

!0 = distinct !{!0, !1}
!1 = !{!"llvm.loop.vectorize.predicate.enable", i1 true}