llvm/test/Transforms/LoopVectorize/pr46525-expander-insertpoint.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=loop-vectorize -force-vector-width=2 -S -tail-folding-policy=must-fold-tail %s | FileCheck %s


; Test case for PR46525. There are two candidates to pick for
; `udiv i64 %y, %add` when expanding SCEV expressions. Make sure we pick %div,
; which dominates the vector loop.

define void @test(i16 %x, i64 %y, ptr %ptr) {
; CHECK-LABEL: @test(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[CONV19:%.*]] = sext i16 [[X:%.*]] to i64
; CHECK-NEXT:    [[ADD:%.*]] = add i64 [[CONV19]], 492802768830814067
; CHECK-NEXT:    br label [[LOOP_PREHEADER:%.*]]
; CHECK:       loop.preheader:
; CHECK-NEXT:    [[DIV:%.*]] = udiv i64 [[Y:%.*]], [[ADD]]
; CHECK-NEXT:    [[INC:%.*]] = add i64 [[DIV]], 1
; CHECK-NEXT:    [[TMP0:%.*]] = add nuw nsw i64 [[DIV]], 4
; CHECK-NEXT:    [[TMP1:%.*]] = udiv i64 [[TMP0]], [[INC]]
; CHECK-NEXT:    [[TMP2:%.*]] = add nuw nsw i64 [[TMP1]], 1
; CHECK-NEXT:    br label [[VECTOR_PH:%.*]]
; CHECK:       vector.ph:
; CHECK-NEXT:    [[N_RND_UP:%.*]] = add i64 [[TMP2]], 1
; CHECK-NEXT:    [[N_MOD_VF:%.*]] = and i64 [[N_RND_UP]], 1
; CHECK-NEXT:    [[N_VEC:%.*]] = sub i64 [[N_RND_UP]], [[N_MOD_VF]]
; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
; CHECK:       vector.body:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 2
; CHECK-NEXT:    [[TMP3:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP3]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       middle.block:
; CHECK-NEXT:    store i32 0, ptr [[PTR:%.*]], align 4
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop.exit:
; CHECK-NEXT:    [[DIV_1:%.*]] = udiv i64 [[Y]], [[ADD]]
; CHECK-NEXT:    [[V1:%.*]] = add i64 [[DIV_1]], 1
; CHECK-NEXT:    br label [[LOOP_2:%.*]]
; CHECK:       loop.2:
; CHECK-NEXT:    [[IV_1:%.*]] = phi i64 [ [[IV_NEXT_1:%.*]], [[LOOP_2]] ], [ 0, [[LOOP]] ]
; CHECK-NEXT:    [[IV_NEXT_1]] = add i64 [[IV_1]], [[V1]]
; CHECK-NEXT:    call void @use(i64 [[IV_NEXT_1]])
; CHECK-NEXT:    [[EC:%.*]] = icmp ult i64 [[IV_NEXT_1]], 200
; CHECK-NEXT:    br i1 [[EC]], label [[LOOP_2]], label [[LOOP_2_EXIT:%.*]]
; CHECK:       loop.2.exit:
; CHECK-NEXT:    [[C:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C]], label [[LOOP_PREHEADER]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %conv19 = sext i16 %x to i64
  %add = add i64 %conv19, 492802768830814067
  br label %loop.preheader

loop.preheader:
  %div = udiv i64 %y, %add
  %inc = add i64 %div, 1
  br label %loop

loop:
  %iv = phi i64 [ %iv.next, %loop ], [ 0, %loop.preheader ]
  store i32 0, ptr %ptr, align 4
  %v2 = trunc i64 %iv to i8
  %v3 = add i8 %v2, 1
  %cmp15 = icmp slt i8 %v3, 5
  %iv.next = add i64 %iv, %inc
  br i1 %cmp15, label %loop, label %loop.exit

loop.exit:
  %div.1 = udiv i64 %y, %add
  %v1 = add i64 %div.1, 1
  br label %loop.2

loop.2:
  %iv.1 = phi i64 [ %iv.next.1, %loop.2 ], [ 0, %loop.exit ]
  %iv.next.1 = add i64 %iv.1, %v1
  call void @use(i64 %iv.next.1)
  %ec = icmp ult i64 %iv.next.1, 200
  br i1 %ec, label %loop.2, label %loop.2.exit

loop.2.exit:
  %c = call i1 @cond()
  br i1 %c, label %loop.preheader, label %exit

exit:
  ret void
}

declare void @use(i64)
declare i1 @cond()