llvm/test/Transforms/LoopVectorize/tail-folding-switch.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt -p loop-vectorize -force-vector-width=4 -force-vector-interleave=1 -tail-folding-policy=must-fold-tail -S %s | FileCheck %s
target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128-Fn32"

define void @tail_fold_switch(ptr %dst, i32 %0) {
; CHECK-LABEL: define void @tail_fold_switch(
; CHECK-SAME: ptr [[DST:%.*]], i32 [[TMP0:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i32> poison, i32 [[TMP0]], i64 0
; CHECK-NEXT:    [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i32> [[BROADCAST_SPLATINSERT]], <4 x i32> poison, <4 x i32> zeroinitializer
; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq <4 x i32> [[BROADCAST_SPLAT]], splat (i32 1)
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[PRED_STORE_CONTINUE6:.*]] ]
; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <4 x i8> [ <i8 0, i8 1, i8 2, i8 3>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[PRED_STORE_CONTINUE6]] ]
; CHECK-NEXT:    [[TMP1:%.*]] = icmp ule <4 x i8> [[VEC_IND]], splat (i8 4)
; CHECK-NEXT:    [[TMP3:%.*]] = select <4 x i1> [[TMP1]], <4 x i1> [[TMP2]], <4 x i1> zeroinitializer
; CHECK-NEXT:    [[TMP4:%.*]] = extractelement <4 x i1> [[TMP3]], i64 0
; CHECK-NEXT:    br i1 [[TMP4]], label %[[PRED_STORE_IF:.*]], label %[[PRED_STORE_CONTINUE:.*]]
; CHECK:       [[PRED_STORE_IF]]:
; CHECK-NEXT:    [[TMP6:%.*]] = getelementptr inbounds i32, ptr [[DST]], i64 [[INDEX]]
; CHECK-NEXT:    store i32 0, ptr [[TMP6]], align 4
; CHECK-NEXT:    br label %[[PRED_STORE_CONTINUE]]
; CHECK:       [[PRED_STORE_CONTINUE]]:
; CHECK-NEXT:    [[TMP7:%.*]] = extractelement <4 x i1> [[TMP3]], i64 1
; CHECK-NEXT:    br i1 [[TMP7]], label %[[PRED_STORE_IF1:.*]], label %[[PRED_STORE_CONTINUE2:.*]]
; CHECK:       [[PRED_STORE_IF1]]:
; CHECK-NEXT:    [[TMP8:%.*]] = add i64 [[INDEX]], 1
; CHECK-NEXT:    [[TMP9:%.*]] = getelementptr inbounds i32, ptr [[DST]], i64 [[TMP8]]
; CHECK-NEXT:    store i32 0, ptr [[TMP9]], align 4
; CHECK-NEXT:    br label %[[PRED_STORE_CONTINUE2]]
; CHECK:       [[PRED_STORE_CONTINUE2]]:
; CHECK-NEXT:    [[TMP10:%.*]] = extractelement <4 x i1> [[TMP3]], i64 2
; CHECK-NEXT:    br i1 [[TMP10]], label %[[PRED_STORE_IF3:.*]], label %[[PRED_STORE_CONTINUE4:.*]]
; CHECK:       [[PRED_STORE_IF3]]:
; CHECK-NEXT:    [[TMP11:%.*]] = add i64 [[INDEX]], 2
; CHECK-NEXT:    [[TMP12:%.*]] = getelementptr inbounds i32, ptr [[DST]], i64 [[TMP11]]
; CHECK-NEXT:    store i32 0, ptr [[TMP12]], align 4
; CHECK-NEXT:    br label %[[PRED_STORE_CONTINUE4]]
; CHECK:       [[PRED_STORE_CONTINUE4]]:
; CHECK-NEXT:    [[TMP13:%.*]] = extractelement <4 x i1> [[TMP3]], i64 3
; CHECK-NEXT:    br i1 [[TMP13]], label %[[PRED_STORE_IF5:.*]], label %[[PRED_STORE_CONTINUE6]]
; CHECK:       [[PRED_STORE_IF5]]:
; CHECK-NEXT:    [[TMP14:%.*]] = add i64 [[INDEX]], 3
; CHECK-NEXT:    [[TMP15:%.*]] = getelementptr inbounds i32, ptr [[DST]], i64 [[TMP14]]
; CHECK-NEXT:    store i32 0, ptr [[TMP15]], align 4
; CHECK-NEXT:    br label %[[PRED_STORE_CONTINUE6]]
; CHECK:       [[PRED_STORE_CONTINUE6]]:
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[VEC_IND_NEXT]] = add nuw <4 x i8> [[VEC_IND]], splat (i8 4)
; CHECK-NEXT:    [[TMP16:%.*]] = icmp eq i64 [[INDEX_NEXT]], 8
; CHECK-NEXT:    br i1 [[TMP16]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    br label %[[EXIT:.*]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop.header

loop.header:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
  switch i32 %0, label %loop.latch [
  i32 0, label %loop.latch
  i32 1, label %if.then
  ]

if.then:
  %gep = getelementptr inbounds i32, ptr %dst, i64 %iv
  store i32 0, ptr %gep, align 4
  br label %loop.latch

loop.latch:
  %iv.next = add i64 %iv, 1
  %ec = icmp eq i64 %iv, 4
  br i1 %ec, label %exit, label %loop.header

exit:
  ret void
}
;.
; CHECK: [[LOOP0]] = distinct !{[[LOOP0]], [[META1:![0-9]+]], [[META2:![0-9]+]]}
; CHECK: [[META1]] = !{!"llvm.loop.isvectorized", i32 1}
; CHECK: [[META2]] = !{!"llvm.loop.unroll.runtime.disable"}
;.