llvm/test/Transforms/LoopVectorize/sink-to-early-exit.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 6
; RUN: opt -S < %s -p loop-vectorize -force-vector-width=4 | FileCheck %s

; TODO: Recipe used only in the early exit block can be sunk there.

declare void @init_mem(ptr, i64)

define i64 @sink_to_early_exit(i64 %offset) {
; CHECK-LABEL: define i64 @sink_to_early_exit(
; CHECK-SAME: i64 [[OFFSET:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[P1:%.*]] = alloca [1024 x i8], align 4
; CHECK-NEXT:    [[P2:%.*]] = alloca [1024 x i8], align 4
; CHECK-NEXT:    call void @init_mem(ptr [[P1]], i64 1024)
; CHECK-NEXT:    call void @init_mem(ptr [[P2]], i64 1024)
; CHECK-NEXT:    br label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i64> poison, i64 [[OFFSET]], i64 0
; CHECK-NEXT:    [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i64> [[BROADCAST_SPLATINSERT]], <4 x i64> poison, <4 x i32> zeroinitializer
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX2:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT4:%.*]], %[[VECTOR_BODY_INTERIM:.*]] ]
; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <4 x i64> [ <i64 0, i64 1, i64 2, i64 3>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_BODY_INTERIM]] ]
; CHECK-NEXT:    [[TMP0:%.*]] = getelementptr inbounds i8, ptr [[P1]], i64 [[INDEX2]]
; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <4 x i8>, ptr [[TMP0]], align 1
; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[P2]], i64 [[INDEX2]]
; CHECK-NEXT:    [[WIDE_LOAD3:%.*]] = load <4 x i8>, ptr [[TMP1]], align 1
; CHECK-NEXT:    [[TMP3:%.*]] = icmp ne <4 x i8> [[WIDE_LOAD]], [[WIDE_LOAD3]]
; CHECK-NEXT:    [[INDEX_NEXT4]] = add nuw i64 [[INDEX2]], 4
; CHECK-NEXT:    [[TMP4:%.*]] = freeze <4 x i1> [[TMP3]]
; CHECK-NEXT:    [[TMP5:%.*]] = call i1 @llvm.vector.reduce.or.v4i1(<4 x i1> [[TMP4]])
; CHECK-NEXT:    [[TMP6:%.*]] = icmp eq i64 [[INDEX_NEXT4]], 1024
; CHECK-NEXT:    [[VEC_IND_NEXT]] = add <4 x i64> [[VEC_IND]], splat (i64 4)
; CHECK-NEXT:    br i1 [[TMP5]], label %[[VECTOR_EARLY_EXIT:.*]], label %[[VECTOR_BODY_INTERIM]]
; CHECK:       [[VECTOR_BODY_INTERIM]]:
; CHECK-NEXT:    br i1 [[TMP6]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    br label %[[LOOP_END:.*]]
; CHECK:       [[VECTOR_EARLY_EXIT]]:
; CHECK-NEXT:    [[TMP2:%.*]] = add <4 x i64> [[VEC_IND]], [[BROADCAST_SPLAT]]
; CHECK-NEXT:    [[FIRST_ACTIVE_LANE:%.*]] = call i64 @llvm.experimental.cttz.elts.i64.v4i1(<4 x i1> [[TMP3]], i1 false)
; CHECK-NEXT:    [[TMP7:%.*]] = extractelement <4 x i64> [[TMP2]], i64 [[FIRST_ACTIVE_LANE]]
; CHECK-NEXT:    br label %[[LOOP_EARLY_EXIT:.*]]
; CHECK:       [[LOOP_EARLY_EXIT]]:
; CHECK-NEXT:    ret i64 [[TMP7]]
; CHECK:       [[LOOP_END]]:
; CHECK-NEXT:    ret i64 0
;
entry:
  %p1 = alloca [1024 x i8], align 4
  %p2 = alloca [1024 x i8], align 4
  call void @init_mem(ptr %p1, i64 1024)
  call void @init_mem(ptr %p2, i64 1024)
  br label %loop

loop:
  %index = phi i64 [ %index.next, %loop.inc ], [ 0, %entry ]
  %arrayidx = getelementptr inbounds i8, ptr %p1, i64 %index
  %ld1 = load i8, ptr %arrayidx, align 1
  %arrayidx1 = getelementptr inbounds i8, ptr %p2, i64 %index
  %ld2 = load i8, ptr %arrayidx1, align 1
  %result = add i64 %index, %offset
  %cmp = icmp eq i8 %ld1, %ld2
  br i1 %cmp, label %loop.inc, label %loop.early.exit

loop.inc:
  %index.next = add i64 %index, 1
  %exitcond = icmp ne i64 %index.next, 1024
  br i1 %exitcond, label %loop, label %loop.end

loop.early.exit:
  ret i64 %result

loop.end:
  ret i64 0
}