llvm/test/Transforms/LoopVectorize/vplan-outer-loop-uncomputable-trip-count.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 6
; RUN: opt -passes=loop-vectorize -enable-vplan-native-path -S %s | FileCheck %s

declare i1 @cond()

; Make sure we do not vectorize (or crash) on outer loops with uncomputable
; trip-counts.

define void @test() {
; CHECK-LABEL: define void @test() {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br label %[[FOR1_HEADER:.*]]
; CHECK:       [[FOR1_HEADER]]:
; CHECK-NEXT:    br label %[[FOR2_HEADER:.*]]
; CHECK:       [[FOR2_HEADER]]:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ 0, %[[FOR1_HEADER]] ], [ [[INDVARS_IV_NEXT:%.*]], %[[FOR2_HEADER]] ]
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp eq i64 [[INDVARS_IV_NEXT]], 0
; CHECK-NEXT:    br i1 [[EXITCOND]], label %[[FOR1_LATCH:.*]], label %[[FOR2_HEADER]]
; CHECK:       [[FOR1_LATCH]]:
; CHECK-NEXT:    [[C:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C]], label %[[EXIT:.*]], label %[[FOR1_HEADER]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %outer.header

outer.header:
  br label %inner

inner:
  %iv = phi i64 [ 0, %outer.header ], [ %iv.next, %inner ]
  %iv.next = add nuw nsw i64 %iv, 1
  %inner.ec = icmp eq i64 %iv.next, 0
  br i1 %inner.ec, label %outer.latch, label %inner

outer.latch:
  %c = call i1 @cond()
  br i1 %c, label %exit, label %outer.header, !llvm.loop !0

exit:
  ret void
}

!0 = distinct !{!0, !1}
!1 = !{!"llvm.loop.vectorize.enable", i1 true}