# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple=thumbv8.1m.main -mattr=+mve -run-pass=arm-low-overhead-loops %s -o - --verify-machineinstrs | FileCheck %s

# Test that the scalar register that aliases a Q reg prevents the tail
# predication.

--- |
  define dso_local i32 @no_vpsel_liveout(i16* nocapture readonly %a, i16* nocapture readonly %b, i32 %N) local_unnamed_addr #0 {
  entry:
    %cmp9 = icmp eq i32 %N, 0
    %tmp = add i32 %N, 3
    %tmp1 = lshr i32 %tmp, 2
    %tmp2 = shl nuw i32 %tmp1, 2
    %tmp3 = add i32 %tmp2, -4
    %tmp4 = lshr i32 %tmp3, 2
    %tmp5 = add nuw nsw i32 %tmp4, 1
    br i1 %cmp9, label %for.cond.cleanup, label %vector.ph

  vector.ph:                                        ; preds = %entry
    %start = call i32 @llvm.start.loop.iterations.i32(i32 %tmp5)
    br label %vector.body

  vector.body:                                      ; preds = %vector.body, %vector.ph
    %lsr.iv1 = phi i32 [ %lsr.iv.next, %vector.body ], [ %start, %vector.ph ]
    %lsr.iv18 = phi i16* [ %scevgep19, %vector.body ], [ %b, %vector.ph ]
    %lsr.iv = phi i16* [ %scevgep, %vector.body ], [ %a, %vector.ph ]
    %vec.phi = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %tmp13, %vector.body ]
    %tmp7 = phi i32 [ %N, %vector.ph ], [ %tmp9, %vector.body ]
    %lsr.iv17 = bitcast i16* %lsr.iv to <4 x i16>*
    %lsr.iv1820 = bitcast i16* %lsr.iv18 to <4 x i16>*
    %tmp8 = call <4 x i1> @llvm.arm.mve.vctp32(i32 %tmp7)
    %tmp9 = sub i32 %tmp7, 4
    %wide.masked.load = call <4 x i16> @llvm.masked.load.v4i16.p0v4i16(<4 x i16>* %lsr.iv17, i32 2, <4 x i1> %tmp8, <4 x i16> undef)
    %tmp10 = sext <4 x i16> %wide.masked.load to <4 x i32>
    %wide.masked.load14 = call <4 x i16> @llvm.masked.load.v4i16.p0v4i16(<4 x i16>* %lsr.iv1820, i32 2, <4 x i1> %tmp8, <4 x i16> undef)
    %tmp11 = sext <4 x i16> %wide.masked.load14 to <4 x i32>
    %tmp12 = mul nsw <4 x i32> %tmp11, %tmp10
    %tmp13 = add <4 x i32> %tmp12, %vec.phi
    %scevgep = getelementptr i16, i16* %lsr.iv, i32 4
    %scevgep19 = getelementptr i16, i16* %lsr.iv18, i32 4
    %tmp14 = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %lsr.iv1, i32 1)
    %tmp15 = icmp ne i32 %tmp14, 0
    %lsr.iv.next = add nsw i32 %lsr.iv1, -1
    br i1 %tmp15, label %vector.body, label %middle.block

  middle.block:                                     ; preds = %vector.body
    %tmp16 = extractelement <4 x i32> %tmp13, i32 3
    br label %for.cond.cleanup

  for.cond.cleanup:                                 ; preds = %middle.block, %entry
    %res.0.lcssa = phi i32 [ 0, %entry ], [ %tmp16, %middle.block ]
    ret i32 %res.0.lcssa
  }
  declare <4 x i16> @llvm.masked.load.v4i16.p0v4i16(<4 x i16>*, i32 immarg, <4 x i1>, <4 x i16>)
  declare i32 @llvm.start.loop.iterations.i32(i32)
  declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32)
  declare <4 x i1> @llvm.arm.mve.vctp32(i32)

...
---
name:            no_vpsel_liveout
alignment:       2
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
failedISel:      false
tracksRegLiveness: true
hasWinCFI:       false
registers:       []
liveins:
  - { reg: '$r0', virtual-reg: '' }
  - { reg: '$r1', virtual-reg: '' }
  - { reg: '$r2', virtual-reg: '' }
frameInfo:
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  hasStackMap:     false
  hasPatchPoint:   false
  stackSize:       8
  offsetAdjustment: 0
  maxAlignment:    4
  adjustsStack:    false
  hasCalls:        false
  stackProtector:  ''
  maxCallFrameSize: 0
  cvBytesOfCalleeSavedRegisters: 0
  hasOpaqueSPAdjustment: false
  hasVAStart:      false
  hasMustTailInVarArgFunc: false
  localFrameSize:  0
  savePoint:       ''
  restorePoint:    ''
fixedStack:      []
stack:
  - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
      stack-id: default, callee-saved-register: '$lr', callee-saved-restored: false,
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
  - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
      stack-id: default, callee-saved-register: '$r7', callee-saved-restored: true,
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
callSites:       []
constants:       []
machineFunctionInfo: {}
body:             |
  ; CHECK-LABEL: name: no_vpsel_liveout
  ; CHECK: bb.0.entry:
  ; CHECK:   successors: %bb.1(0x80000000)
  ; CHECK:   liveins: $lr, $r0, $r1, $r2, $r7
  ; CHECK:   tCMPi8 renamable $r2, 0, 14 /* CC::al */, $noreg, implicit-def $cpsr
  ; CHECK:   t2IT 0, 4, implicit-def $itstate
  ; CHECK:   renamable $r0 = tMOVi8 $noreg, 0, 0 /* CC::eq */, $cpsr, implicit killed $r0, implicit $itstate
  ; CHECK:   tBX_RET 0 /* CC::eq */, killed $cpsr, implicit $r0, implicit killed $itstate
  ; CHECK: bb.1.vector.ph:
  ; CHECK:   successors: %bb.2(0x80000000)
  ; CHECK:   liveins: $lr, $r0, $r1, $r2, $r7
  ; CHECK:   frame-setup tPUSH 14 /* CC::al */, $noreg, killed $r7, killed $lr, implicit-def $sp, implicit $sp
  ; CHECK:   frame-setup CFI_INSTRUCTION def_cfa_offset 8
  ; CHECK:   frame-setup CFI_INSTRUCTION offset $lr, -4
  ; CHECK:   frame-setup CFI_INSTRUCTION offset $r7, -8
  ; CHECK:   renamable $q0 = MVE_VMOVimmi32 0, 0, $noreg, $noreg, undef renamable $q0
  ; CHECK:   $lr = MVE_DLSTP_32 killed renamable $r2
  ; CHECK: bb.2.vector.body:
  ; CHECK:   successors: %bb.2(0x7c000000), %bb.3(0x04000000)
  ; CHECK:   liveins: $lr, $q0, $r0, $r1
  ; CHECK:   renamable $r0, renamable $q1 = MVE_VLDRHS32_post killed renamable $r0, 8, 0, $noreg, $noreg :: (load (s64) from %ir.lsr.iv17, align 2)
  ; CHECK:   renamable $r1, renamable $q2 = MVE_VLDRHS32_post killed renamable $r1, 8, 0, killed $noreg, $noreg :: (load (s64) from %ir.lsr.iv1820, align 2)
  ; CHECK:   renamable $q1 = nsw MVE_VMULi32 killed renamable $q2, killed renamable $q1, 0, $noreg, $noreg, undef renamable $q1
  ; CHECK:   renamable $q0 = MVE_VADDi32 killed renamable $q1, killed renamable $q0, 0, $noreg, $noreg, undef renamable $q0
  ; CHECK:   $lr = MVE_LETP killed renamable $lr, %bb.2
  ; CHECK: bb.3.middle.block:
  ; CHECK:   liveins: $q0
  ; CHECK:   $r0 = VMOVRS killed $s3, 14 /* CC::al */, $noreg, implicit killed $q0
  ; CHECK:   tPOP_RET 14 /* CC::al */, $noreg, def $r7, def $pc, implicit killed $r0
  bb.0.entry:
    successors: %bb.1(0x80000000)
    liveins: $r0, $r1, $r2, $lr, $r7

    tCMPi8 renamable $r2, 0, 14, $noreg, implicit-def $cpsr
    t2IT 0, 4, implicit-def $itstate
    renamable $r0 = tMOVi8 $noreg, 0, 0, $cpsr, implicit killed $r0, implicit $itstate
    tBX_RET 0, killed $cpsr, implicit $r0, implicit killed $itstate

  bb.1.vector.ph:
    successors: %bb.2(0x80000000)
    liveins: $r0, $r1, $r2, $lr, $r7

    frame-setup tPUSH 14, $noreg, killed $r7, killed $lr, implicit-def $sp, implicit $sp
    frame-setup CFI_INSTRUCTION def_cfa_offset 8
    frame-setup CFI_INSTRUCTION offset $lr, -4
    frame-setup CFI_INSTRUCTION offset $r7, -8
    renamable $r3, dead $cpsr = tADDi3 renamable $r2, 3, 14, $noreg
    renamable $q0 = MVE_VMOVimmi32 0, 0, $noreg, $noreg, undef renamable $q0
    renamable $r3 = t2BICri killed renamable $r3, 3, 14, $noreg, $noreg
    renamable $r12 = t2SUBri killed renamable $r3, 4, 14, $noreg, $noreg
    renamable $r3, dead $cpsr = tMOVi8 1, 14, $noreg
    renamable $r12 = nuw nsw t2ADDrs killed renamable $r3, killed renamable $r12, 19, 14, $noreg, $noreg
    $lr = t2DoLoopStart renamable $r12
    $r3 = tMOVr killed $r12, 14, $noreg

  bb.2.vector.body:
    successors: %bb.2(0x7c000000), %bb.3(0x04000000)
    liveins: $q0, $r0, $r1, $r2, $r3

    renamable $vpr = MVE_VCTP32 renamable $r2, 0, $noreg, $noreg
    MVE_VPST 4, implicit $vpr
    renamable $r0, renamable $q1 = MVE_VLDRHS32_post killed renamable $r0, 8, 1, renamable $vpr, $noreg :: (load (s64) from %ir.lsr.iv17, align 2)
    renamable $r1, renamable $q2 = MVE_VLDRHS32_post killed renamable $r1, 8, 1, killed renamable $vpr, $noreg :: (load (s64) from %ir.lsr.iv1820, align 2)
    $lr = tMOVr $r3, 14, $noreg
    renamable $q1 = nsw MVE_VMULi32 killed renamable $q2, killed renamable $q1, 0, $noreg, $noreg, undef renamable $q1
    renamable $r3, dead $cpsr = nsw tSUBi8 killed $r3, 1, 14, $noreg
    renamable $r2, dead $cpsr = tSUBi8 killed renamable $r2, 4, 14, $noreg
    renamable $q0 = MVE_VADDi32 killed renamable $q1, killed renamable $q0, 0, $noreg, $noreg, undef renamable $q0
    renamable $lr = t2LoopDec killed renamable $lr, 1
    t2LoopEnd killed renamable $lr, %bb.2, implicit-def dead $cpsr
    tB %bb.3, 14, $noreg

  bb.3.middle.block:
    liveins: $q0

    $r0 = VMOVRS killed $s3, 14, $noreg, implicit $q0
    tPOP_RET 14, $noreg, def $r7, def $pc, implicit killed $r0

...