test/Transforms/LoopVectorize/alias-mask-small-index.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --filter-out-after "^vector.ph:" --version 5
; RUN: opt -S -force-partial-aliasing-vectorization -force-target-supports-masked-memory-ops -tail-folding-policy=must-fold-tail -force-vector-width=4 -passes=loop-vectorize %s | FileCheck %s

target datalayout = "p0:64:64:64:16"

; Tests we correctly handle the extend for "NUM_ACTIVE_LANES" when the GEP index
; is smaller than the IV type.
define void @alias_mask(ptr noalias %a, ptr %b, ptr %c, i64 %n) {
; CHECK-LABEL: define void @alias_mask(
; CHECK-SAME: ptr noalias [[A:%.*]], ptr [[B:%.*]], ptr [[C:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[B2:%.*]] = ptrtoaddr ptr [[B]] to i16
; CHECK-NEXT:    [[C1:%.*]] = ptrtoaddr ptr [[C]] to i16
; CHECK-NEXT:    br label %[[VECTOR_CLAMPED_VF_CHECK:.*]]
; CHECK:       [[VECTOR_CLAMPED_VF_CHECK]]:
; CHECK-NEXT:    [[TMP0:%.*]] = call <4 x i1> @llvm.loop.dependence.war.mask.v4i1.i16(i16 [[B2]], i16 [[C1]], i16 1)
; CHECK-NEXT:    [[TMP1:%.*]] = zext <4 x i1> [[TMP0]] to <4 x i16>
; CHECK-NEXT:    [[TMP2:%.*]] = call i16 @llvm.vector.reduce.add.v4i16(<4 x i16> [[TMP1]])
; CHECK-NEXT:    [[NUM_ACTIVE_LANES:%.*]] = zext i16 [[TMP2]] to i64
; CHECK-NEXT:    [[VF_IS_SCALAR:%.*]] = icmp ule i64 [[NUM_ACTIVE_LANES]], 1
; CHECK-NEXT:    [[TMP5:%.*]] = sub i64 -1, [[N]]
; CHECK-NEXT:    [[VF_STEP_OVERFLOW:%.*]] = icmp ult i64 [[TMP5]], [[NUM_ACTIVE_LANES]]
; CHECK-NEXT:    [[TMP6:%.*]] = or i1 [[VF_IS_SCALAR]], [[VF_STEP_OVERFLOW]]
; CHECK-NEXT:    br i1 [[TMP6]], [[SCALAR_PH:label %.*]], label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
;
entry:
  br label %for.body

for.body:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
  %gep.a = getelementptr inbounds i8, ptr %a, i64 %iv
  %load.a = load i8, ptr %gep.a, align 1
  %gep.b = getelementptr inbounds i8, ptr %b, i64 %iv
  %load.b = load i8, ptr %gep.b, align 1
  %add = add i8 %load.b, %load.a
  %gep.c = getelementptr inbounds i8, ptr %c, i64 %iv
  store i8 %add, ptr %gep.c, align 1
  %iv.next = add nuw nsw i64 %iv, 1
  %exitcond.not = icmp eq i64 %iv.next, %n
  br i1 %exitcond.not, label %exit, label %for.body

exit:
  ret void
}