llvm/test/Transforms/LoopVectorize/interleaved-accesses-dead-member.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --filter-out-after "^scalar.ph" --version 6
; RUN: opt < %s -S -p loop-vectorize -force-vector-width=4 -enable-interleaved-mem-accesses=true | FileCheck %s

; If the member holding the insert position is dead, make sure we choose a new member to insert at that dominates all other members.
define void @dead_member_order(ptr noalias %src, ptr noalias %dst1, ptr noalias %dst2, i32 %N) {
; CHECK-LABEL: define void @dead_member_order(
; CHECK-SAME: ptr noalias [[SRC:%.*]], ptr noalias [[DST1:%.*]], ptr noalias [[DST2:%.*]], i32 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[N]], 4
; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_SCEVCHECK:.*]]
; CHECK:       [[VECTOR_SCEVCHECK]]:
; CHECK-NEXT:    [[TMP0:%.*]] = add i32 [[N]], -1
; CHECK-NEXT:    [[TMP1:%.*]] = icmp slt i32 [[TMP0]], 0
; CHECK-NEXT:    br i1 [[TMP1]], 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:    [[TMP2:%.*]] = getelementptr [3 x i8], ptr [[SRC]], i32 [[INDEX]], i32 1
; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr i8, ptr [[TMP2]], i32 -1
; CHECK-NEXT:    [[WIDE_VEC:%.*]] = load <12 x i8>, ptr [[TMP3]], align 1
; CHECK-NEXT:    [[STRIDED_VEC:%.*]] = shufflevector <12 x i8> [[WIDE_VEC]], <12 x i8> poison, <4 x i32> <i32 0, i32 3, i32 6, i32 9>
; CHECK-NEXT:    [[STRIDED_VEC1:%.*]] = shufflevector <12 x i8> [[WIDE_VEC]], <12 x i8> poison, <4 x i32> <i32 1, i32 4, i32 7, i32 10>
; CHECK-NEXT:    [[STRIDED_VEC2:%.*]] = shufflevector <12 x i8> [[WIDE_VEC]], <12 x i8> poison, <4 x i32> <i32 2, i32 5, i32 8, i32 11>
; CHECK-NEXT:    [[TMP4:%.*]] = getelementptr i8, ptr [[DST1]], i32 [[INDEX]]
; CHECK-NEXT:    store <4 x i8> [[STRIDED_VEC1]], ptr [[TMP4]], align 1
; CHECK-NEXT:    [[TMP5:%.*]] = add <4 x i8> [[STRIDED_VEC1]], [[STRIDED_VEC]]
; CHECK-NEXT:    [[TMP6:%.*]] = getelementptr i8, ptr [[DST2]], i32 [[INDEX]]
; CHECK-NEXT:    store <4 x i8> [[TMP5]], ptr [[TMP6]], align 1
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 4
; CHECK-NEXT:    [[TMP7:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP7]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i32 [[N]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[CMP_N]], [[EXIT:label %.*]], label %[[SCALAR_PH]]
; CHECK:       [[SCALAR_PH]]:
;
entry:
  br label %loop

loop:
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]

  %gep.x = getelementptr [3 x i8], ptr %src, i32 %iv, i32 2
  %x = load i8, ptr %gep.x ; dead

  %gep.y = getelementptr [3 x i8], ptr %src, i32 %iv, i32 1
  %y = load i8, ptr %gep.y

  %gep.dst1 = getelementptr i8, ptr %dst1, i32 %iv
  store i8 %y, ptr %gep.dst1

  %gep.z = getelementptr [3 x i8], ptr %src, i32 %iv, i32 0
  %z = load i8, ptr %gep.z

  %res = add i8 %y, %z
  %gep.dst2 = getelementptr i8, ptr %dst2, i32 %iv
  store i8 %res, ptr %gep.dst2

  %iv.next = add i32 %iv, 1
  %ec = icmp eq i32 %iv.next, %N
  br i1 %ec, label %exit, label %loop

exit:
  ret void
}

; Make sure we intersect the fact that the dead load doesn't have !invariant.load
define void @dead_member_metadata(ptr noalias %src, ptr noalias %dst, i32 %N) {
; CHECK-LABEL: define void @dead_member_metadata(
; CHECK-SAME: ptr noalias [[SRC:%.*]], ptr noalias [[DST:%.*]], i32 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[N]], 4
; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_SCEVCHECK:.*]]
; CHECK:       [[VECTOR_SCEVCHECK]]:
; CHECK-NEXT:    [[TMP0:%.*]] = add i32 [[N]], -1
; CHECK-NEXT:    [[TMP1:%.*]] = icmp slt i32 [[TMP0]], 0
; CHECK-NEXT:    br i1 [[TMP1]], 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:    [[TMP2:%.*]] = getelementptr [2 x i8], ptr [[SRC]], i32 [[INDEX]], i32 1
; CHECK-NEXT:    [[TMP5:%.*]] = getelementptr i8, ptr [[TMP2]], i32 -1
; CHECK-NEXT:    [[WIDE_VEC:%.*]] = load <8 x i8>, ptr [[TMP5]], align 1
; CHECK-NEXT:    [[STRIDED_VEC:%.*]] = shufflevector <8 x i8> [[WIDE_VEC]], <8 x i8> poison, <4 x i32> <i32 0, i32 2, i32 4, i32 6>
; CHECK-NEXT:    [[STRIDED_VEC1:%.*]] = shufflevector <8 x i8> [[WIDE_VEC]], <8 x i8> poison, <4 x i32> <i32 1, i32 3, i32 5, i32 7>
; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr i8, ptr [[DST]], i32 [[INDEX]]
; CHECK-NEXT:    store <4 x i8> [[STRIDED_VEC1]], ptr [[TMP3]], align 1
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 4
; CHECK-NEXT:    [[TMP4:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP4]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i32 [[N]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[CMP_N]], [[EXIT:label %.*]], label %[[SCALAR_PH]]
; CHECK:       [[SCALAR_PH]]:
;
entry:
  br label %loop

loop:
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]

  %gep.y = getelementptr [2 x i8], ptr %src, i32 %iv, i32 1
  %y = load i8, ptr %gep.y, !invariant.load !{}
  %gep.dst = getelementptr i8, ptr %dst, i32 %iv
  store i8 %y, ptr %gep.dst

  %gep.x = getelementptr [2 x i8], ptr %src, i32 %iv, i32 0
  %x = load i8, ptr %gep.x ; dead

  %iv.next = add i32 %iv, 1
  %ec = icmp eq i32 %iv.next, %N
  br i1 %ec, label %exit, label %loop

exit:
  ret void
}