llvm/test/Transforms/LoopVectorize/pr36983-multiple-lcssa.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 5
; RUN: opt -passes=loop-vectorize -S %s | FileCheck %s

; There could be more than one LCSSA PHIs in loop exit block.
define i16 @duplicate_lcssa(i16 %val) {
; CHECK-LABEL: define i16 @duplicate_lcssa(
; CHECK-SAME: i16 [[VAL:%.*]]) {
; 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 i32 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <4 x i16> [ <i16 0, i16 -1, i16 -2, i16 -3>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 4
; CHECK-NEXT:    [[VEC_IND_NEXT]] = add nsw <4 x i16> [[VEC_IND]], splat (i16 -4)
; CHECK-NEXT:    [[TMP1:%.*]] = icmp eq i32 [[INDEX_NEXT]], 65536
; CHECK-NEXT:    br i1 [[TMP1]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    [[TMP0:%.*]] = sub nsw <4 x i16> [[VEC_IND]], splat (i16 1)
; CHECK-NEXT:    [[VECTOR_RECUR_EXTRACT_FOR_PHI1:%.*]] = extractelement <4 x i16> [[TMP0]], i64 2
; CHECK-NEXT:    br label %[[EXIT:.*]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret i16 [[VECTOR_RECUR_EXTRACT_FOR_PHI1]]
;
entry:
  br label %loop

loop:
  %iv = phi i16 [ 0, %entry ], [ %iv.next, %loop ]
  %res = phi i16 [ %val, %entry ], [ %iv.next, %loop ]
  %iv.next = sub nsw i16 %iv, 1
  %exit.cond = icmp ne i16 %iv.next, 0
  br i1 %exit.cond, label %loop, label %exit

exit:
  %lcssa.1 = phi i16 [ %res, %loop ]
  %lcssa.2 = phi i16 [ %res, %loop ]
  ret i16 %lcssa.2
}