llvm/test/Transforms/LoopVectorize/pr66616.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
; RUN: opt -passes="print<scalar-evolution>,loop-vectorize" --verify-scev -S < %s -force-vector-width=4 2>/dev/null | FileCheck %s

; Make sure users of SCEVUnknowns from the scalar loop are invalidated.

define void @pr66616(ptr %ptr) {
; CHECK-LABEL: define void @pr66616(
; CHECK-SAME: ptr [[PTR:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[VECTOR_PH:%.*]]
; CHECK:       vector.ph:
; CHECK-NEXT:    [[TMP0:%.*]] = load i32, ptr [[PTR]], align 4
; CHECK-NEXT:    [[TMP3:%.*]] = add i32 [[TMP0]], 1
; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
; CHECK:       vector.body:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 4
; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq i32 [[INDEX_NEXT]], 256
; CHECK-NEXT:    br i1 [[TMP2]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       middle.block:
; CHECK-NEXT:    br label [[LOOP_1:%.*]]
; CHECK:       preheader:
; CHECK-NEXT:    [[TMP4:%.*]] = sub i32 -1, [[TMP0]]
; CHECK-NEXT:    [[TMP5:%.*]] = zext i32 [[TMP4]] to i64
; CHECK-NEXT:    [[TMP6:%.*]] = add nuw nsw i64 [[TMP5]], 1
; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP6]], 4
; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH1:%.*]], label [[VECTOR_PH2:%.*]]
; CHECK:       vector.ph1:
; CHECK-NEXT:    [[N_MOD_VF:%.*]] = and i64 [[TMP6]], 3
; CHECK-NEXT:    [[N_VEC:%.*]] = sub i64 [[TMP6]], [[N_MOD_VF]]
; CHECK-NEXT:    [[DOTCAST:%.*]] = trunc i64 [[N_VEC]] to i32
; CHECK-NEXT:    [[TMP8:%.*]] = add i32 [[TMP3]], [[DOTCAST]]
; CHECK-NEXT:    [[IND_END5:%.*]] = getelementptr i8, ptr [[PTR]], i64 [[N_VEC]]
; CHECK-NEXT:    br label [[VECTOR_BODY3:%.*]]
; CHECK:       vector.body2:
; CHECK-NEXT:    [[INDEX8:%.*]] = phi i64 [ 0, [[VECTOR_PH2]] ], [ [[INDEX_NEXT9:%.*]], [[VECTOR_BODY3]] ]
; CHECK-NEXT:    [[INDEX_NEXT9]] = add nuw i64 [[INDEX8]], 4
; CHECK-NEXT:    [[TMP7:%.*]] = icmp eq i64 [[INDEX_NEXT9]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP7]], label [[MIDDLE_BLOCK5:%.*]], label [[VECTOR_BODY3]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK:       middle.block5:
; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[TMP6]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH1]]
; CHECK:       scalar.ph:
; CHECK-NEXT:    [[BC_RESUME_VAL4:%.*]] = phi i32 [ [[TMP8]], [[MIDDLE_BLOCK5]] ], [ [[TMP3]], [[LOOP_1]] ]
; CHECK-NEXT:    [[BC_RESUME_VAL6:%.*]] = phi ptr [ [[IND_END5]], [[MIDDLE_BLOCK5]] ], [ [[PTR]], [[LOOP_1]] ]
; CHECK-NEXT:    br label [[LOOP_2:%.*]]
; CHECK:       loop.2:
; CHECK-NEXT:    [[IV_2:%.*]] = phi i32 [ [[IV_2_I:%.*]], [[LOOP_2]] ], [ [[BC_RESUME_VAL4]], [[SCALAR_PH1]] ]
; CHECK-NEXT:    [[IV_3:%.*]] = phi ptr [ [[IV_3_I:%.*]], [[LOOP_2]] ], [ [[BC_RESUME_VAL6]], [[SCALAR_PH1]] ]
; CHECK-NEXT:    [[IV_2_I]] = add i32 [[IV_2]], 1
; CHECK-NEXT:    [[IV_3_I]] = getelementptr i8, ptr [[IV_3]], i64 1
; CHECK-NEXT:    [[COND2:%.*]] = icmp eq i32 [[IV_2]], 0
; CHECK-NEXT:    br i1 [[COND2]], label [[EXIT]], label [[LOOP_2]], !llvm.loop [[LOOP4:![0-9]+]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop.1

loop.1:
  %iv.1 = phi i8 [ 0, %entry ], [ %inc, %loop.1 ]
  %load = load i32, ptr %ptr, align 4
  %add3 = add i32 %load, 1
  %inc = add i8 %iv.1, 1
  %cond1 = icmp eq i8 %inc, 0
  br i1 %cond1, label %preheader, label %loop.1

preheader:
  br label %loop.2

loop.2:
  %iv.2 = phi i32 [ %iv.2.i, %loop.2 ], [ %add3, %preheader ]
  %iv.3 = phi ptr [ %iv.3.i, %loop.2 ], [ %ptr, %preheader ]
  %iv.2.i = add i32 %iv.2, 1
  %iv.3.i = getelementptr i8, ptr %iv.3, i64 1
  %cond2 = icmp eq i32 %iv.2, 0
  br i1 %cond2, label %exit, label %loop.2

exit:
  ret void
}