; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt -p loop-vectorize -force-vector-width=4 -force-vector-interleave=2 -S %s | FileCheck %s

; Test case for https://github.com/llvm/llvm-project/issues/118850.
define void @i65_induction_with_negative_step(ptr %dst) {
; CHECK-LABEL: define void @i65_induction_with_negative_step(
; CHECK-SAME: ptr [[DST:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i65 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[VECTOR_RECUR:%.*]] = phi <4 x i64> [ <i64 poison, i64 poison, i64 poison, i64 0>, %[[VECTOR_PH]] ], [ [[STEP_ADD:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <4 x i64> [ <i64 0, i64 -1, i64 -2, i64 -3>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[STEP_ADD]] = add <4 x i64> [[VEC_IND]], splat (i64 -4)
; CHECK-NEXT:    [[OFFSET_IDX:%.*]] = sub i65 0, [[INDEX]]
; CHECK-NEXT:    [[TMP0:%.*]] = trunc i65 [[OFFSET_IDX]] to i64
; CHECK-NEXT:    [[TMP2:%.*]] = shufflevector <4 x i64> [[VECTOR_RECUR]], <4 x i64> [[VEC_IND]], <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; CHECK-NEXT:    [[TMP3:%.*]] = shufflevector <4 x i64> [[VEC_IND]], <4 x i64> [[STEP_ADD]], <4 x i32> <i32 3, i32 4, i32 5, i32 6>
; CHECK-NEXT:    [[TMP4:%.*]] = getelementptr inbounds i64, ptr [[DST]], i64 [[TMP0]]
; CHECK-NEXT:    [[TMP5:%.*]] = getelementptr inbounds i64, ptr [[TMP4]], i32 0
; CHECK-NEXT:    [[TMP6:%.*]] = getelementptr inbounds i64, ptr [[TMP5]], i32 -3
; CHECK-NEXT:    [[TMP7:%.*]] = getelementptr inbounds i64, ptr [[TMP4]], i32 -4
; CHECK-NEXT:    [[TMP8:%.*]] = getelementptr inbounds i64, ptr [[TMP7]], i32 -3
; CHECK-NEXT:    [[REVERSE:%.*]] = shufflevector <4 x i64> [[TMP2]], <4 x i64> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK-NEXT:    store <4 x i64> [[REVERSE]], ptr [[TMP6]], align 8
; CHECK-NEXT:    [[REVERSE1:%.*]] = shufflevector <4 x i64> [[TMP3]], <4 x i64> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK-NEXT:    store <4 x i64> [[REVERSE1]], ptr [[TMP8]], align 8
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i65 [[INDEX]], 8
; CHECK-NEXT:    [[VEC_IND_NEXT]] = add <4 x i64> [[STEP_ADD]], splat (i64 -4)
; CHECK-NEXT:    [[TMP9:%.*]] = icmp eq i65 [[INDEX_NEXT]], 1000
; CHECK-NEXT:    br i1 [[TMP9]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    br label %[[EXIT:.*]]
; CHECK:       [[SCALAR_PH:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[IV_I65:%.*]] = phi i65 [ 0, %[[SCALAR_PH]] ], [ [[IV_I65_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[FOR:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[TRUNC:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[TRUNC]] = trunc i65 [[IV_I65]] to i64
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr inbounds i64, ptr [[DST]], i64 [[TRUNC]]
; CHECK-NEXT:    store i64 [[FOR]], ptr [[GEP]], align 8
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT:    [[ICMP:%.*]] = icmp eq i64 [[IV_NEXT]], 1000
; CHECK-NEXT:    [[IV_I65_NEXT]] = add i65 [[IV_I65]], -1
; CHECK-NEXT:    br i1 [[ICMP]], label %[[EXIT]], label %[[LOOP]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop

loop:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
  %iv.i65 = phi i65 [ 0, %entry ], [ %iv.i65.next, %loop ]
  %for = phi i64 [ 0, %entry ], [ %trunc, %loop ]
  %trunc = trunc i65 %iv.i65 to i64
  %gep = getelementptr inbounds i64, ptr %dst, i64 %trunc
  store i64 %for, ptr %gep, align 8
  %iv.next = add i64 %iv, 1
  %icmp = icmp eq i64 %iv.next, 1000
  %iv.i65.next = add i65 %iv.i65, -1
  br i1 %icmp, label %exit, label %loop

exit:
  ret void
}
;.
; CHECK: [[LOOP0]] = distinct !{[[LOOP0]], [[META1:![0-9]+]], [[META2:![0-9]+]]}
; CHECK: [[META1]] = !{!"llvm.loop.isvectorized", i32 1}
; CHECK: [[META2]] = !{!"llvm.loop.unroll.runtime.disable"}
;.