test/Transforms/LoopVectorize/scalable-predication.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=loop-vectorize -force-tail-folding-style=data -prefer-predicate-over-epilogue=predicate-dont-vectorize -force-target-supports-scalable-vectors -S < %s | FileCheck %s

; vscale is not guaranteed to be a power of two, so this test (which
; deliberately doesn't correspond to an in-tree backend since those
; *do* have vscale as power-of-two) exercises the code required for the
; minimum iteration check in the non-power-of-two case.
define void @foo(i32 %val, ptr dereferenceable(1024) %ptr) {
; CHECK-LABEL: @foo(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[TMP6:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT:    [[TMP7:%.*]] = mul nuw i64 [[TMP6]], 4
; CHECK-NEXT:    [[TMP8:%.*]] = icmp ult i64 -257, [[TMP7]]
; CHECK-NEXT:    br i1 [[TMP8]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK:       vector.ph:
; CHECK-NEXT:    [[TMP0:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT:    [[TMP1:%.*]] = mul nuw i64 [[TMP0]], 4
; CHECK-NEXT:    [[TMP2:%.*]] = sub i64 [[TMP1]], 1
; CHECK-NEXT:    [[N_RND_UP:%.*]] = add i64 256, [[TMP2]]
; 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:    [[TMP3:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT:    [[TMP4:%.*]] = mul nuw i64 [[TMP3]], 4
; 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:%.*]] = call <vscale x 4 x i1> @llvm.get.active.lane.mask.nxv4i1.i64(i64 [[INDEX1]], i64 256)
; CHECK-NEXT:    [[INDEX_NEXT2]] = add i64 [[INDEX1]], [[TMP4]]
; CHECK-NEXT:    [[TMP5:%.*]] = icmp eq i64 [[INDEX_NEXT2]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP5]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       middle.block:
; CHECK-NEXT:    br label [[WHILE_END_LOOPEXIT:%.*]]
; CHECK:       scalar.ph:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 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:    [[LD1:%.*]] = load i32, ptr [[GEP]], align 4
; CHECK-NEXT:    [[INDEX_NEXT]] = add nsw i64 [[INDEX]], 1
; CHECK-NEXT:    [[CMP10:%.*]] = icmp ult i64 [[INDEX_NEXT]], 256
; 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
  %ld1 = load i32, ptr %gep, align 4
  %index.next = add nsw i64 %index, 1
  %cmp10 = icmp ult i64 %index.next, 256
  br i1 %cmp10, label %while.body, label %while.end.loopexit, !llvm.loop !0

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

!0 = distinct !{!0, !1, !2, !3, !4}
!1 = !{!"llvm.loop.vectorize.predicate.enable", i1 true}
!2 = !{!"llvm.loop.vectorize.scalable.enable", i1 true}
!3 = !{!"llvm.loop.interleave.count", i32 1}
!4 = !{!"llvm.loop.vectorize.width", i32 4}