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

# TODOD: As far as I can tell this test is fine. The tail predicating the second loop means we remove the instruction that would otherwise block the first.

--- |
  define arm_aapcs_vfpcc void @arm_var_f32_mve(float* %pSrc, i32 %blockSize, float* nocapture %pResult) #0 {
  entry:
    %0 = add i32 %blockSize, 3
    %1 = icmp slt i32 %blockSize, 4
    %smin = select i1 %1, i32 %blockSize, i32 4
    %2 = sub i32 %0, %smin
    %3 = lshr i32 %2, 2
    %4 = add nuw nsw i32 %3, 1
    %5 = icmp slt i32 %blockSize, 4
    %smin3 = select i1 %5, i32 %blockSize, i32 4
    %6 = sub i32 %0, %smin3
    %7 = lshr i32 %6, 2
    %8 = add nuw nsw i32 %7, 1
    %start1 = call i32 @llvm.start.loop.iterations.i32(i32 %8)
    br label %do.body.i

  do.body.i:                                        ; preds = %do.body.i, %entry
    %blkCnt.0.i = phi i32 [ %13, %do.body.i ], [ %blockSize, %entry ]
    %sumVec.0.i = phi <4 x float> [ %12, %do.body.i ], [ zeroinitializer, %entry ]
    %pSrc.addr.0.i = phi float* [ %add.ptr.i, %do.body.i ], [ %pSrc, %entry ]
    %9 = phi i32 [ %start1, %entry ], [ %14, %do.body.i ]
    %pSrc.addr.0.i2 = bitcast float* %pSrc.addr.0.i to <4 x float>*
    %10 = tail call <4 x i1> @llvm.arm.mve.vctp32(i32 %blkCnt.0.i)
    %11 = tail call fast <4 x float> @llvm.masked.load.v4f32.p0v4f32(<4 x float>* %pSrc.addr.0.i2, i32 4, <4 x i1> %10, <4 x float> zeroinitializer)
    %12 = tail call fast <4 x float> @llvm.arm.mve.add.predicated.v4f32.v4i1(<4 x float> %sumVec.0.i, <4 x float> %11, <4 x i1> %10, <4 x float> %sumVec.0.i)
    %add.ptr.i = getelementptr inbounds float, float* %pSrc.addr.0.i, i32 4
    %13 = add i32 %blkCnt.0.i, -4
    %14 = call i32 @llvm.loop.decrement.reg.i32(i32 %9, i32 1)
    %15 = icmp ne i32 %14, 0
    br i1 %15, label %do.body.i, label %arm_mean_f32_mve.exit

  arm_mean_f32_mve.exit:                            ; preds = %do.body.i
    %16 = extractelement <4 x float> %12, i32 3
    %add2.i.i = fadd fast float %16, %16
    %conv.i = uitofp i32 %blockSize to float
    %div.i = fdiv fast float %add2.i.i, %conv.i
    %17 = bitcast float %div.i to i32
    %18 = insertelement <4 x i32> undef, i32 %17, i64 0
    %19 = shufflevector <4 x i32> %18, <4 x i32> undef, <4 x i32> zeroinitializer
    %20 = bitcast <4 x i32> %19 to <4 x float>
    %start2 = call i32 @llvm.start.loop.iterations.i32(i32 %4)
    br label %do.body

  do.body:                                          ; preds = %do.body, %arm_mean_f32_mve.exit
    %blkCnt.0 = phi i32 [ %blockSize, %arm_mean_f32_mve.exit ], [ %26, %do.body ]
    %sumVec.0 = phi <4 x float> [ zeroinitializer, %arm_mean_f32_mve.exit ], [ %25, %do.body ]
    %pSrc.addr.0 = phi float* [ %pSrc, %arm_mean_f32_mve.exit ], [ %add.ptr, %do.body ]
    %21 = phi i32 [ %start2, %arm_mean_f32_mve.exit ], [ %27, %do.body ]
    %pSrc.addr.01 = bitcast float* %pSrc.addr.0 to <4 x float>*
    %22 = tail call <4 x i1> @llvm.arm.mve.vctp32(i32 %blkCnt.0)
    %23 = tail call fast <4 x float> @llvm.masked.load.v4f32.p0v4f32(<4 x float>* %pSrc.addr.01, i32 4, <4 x i1> %22, <4 x float> zeroinitializer)
    %24 = tail call fast <4 x float> @llvm.arm.mve.sub.predicated.v4f32.v4i1(<4 x float> %23, <4 x float> %20, <4 x i1> %22, <4 x float> undef)
    %25 = tail call fast <4 x float> @llvm.arm.mve.fma.predicated.v4f32.v4i1(<4 x float> %24, <4 x float> %24, <4 x float> %sumVec.0, <4 x i1> %22)
    %add.ptr = getelementptr inbounds float, float* %pSrc.addr.0, i32 4
    %26 = add i32 %blkCnt.0, -4
    %27 = call i32 @llvm.loop.decrement.reg.i32(i32 %21, i32 1)
    %28 = icmp ne i32 %27, 0
    br i1 %28, label %do.body, label %do.end

  do.end:                                           ; preds = %do.body
    %29 = extractelement <4 x float> %25, i32 3
    %add2.i = fadd fast float %29, %29
    %sub2 = add i32 %blockSize, -1
    %conv = uitofp i32 %sub2 to float
    %div = fdiv fast float %add2.i, %conv
    store float %div, float* %pResult, align 4
    ret void
  }

  ; Function Attrs: nounwind readnone
  declare <4 x float> @llvm.arm.mve.sub.predicated.v4f32.v4i1(<4 x float>, <4 x float>, <4 x i1>, <4 x float>) #1

  ; Function Attrs: nounwind readnone
  declare <4 x float> @llvm.arm.mve.fma.predicated.v4f32.v4i1(<4 x float>, <4 x float>, <4 x float>, <4 x i1>) #1

  ; Function Attrs: nounwind readnone
  declare <4 x i1> @llvm.arm.mve.vctp32(i32) #1

  ; Function Attrs: argmemonly nounwind readonly willreturn
  declare <4 x float> @llvm.masked.load.v4f32.p0v4f32(<4 x float>*, i32 immarg, <4 x i1>, <4 x float>) #2

  ; Function Attrs: nounwind readnone
  declare <4 x float> @llvm.arm.mve.add.predicated.v4f32.v4i1(<4 x float>, <4 x float>, <4 x i1>, <4 x float>) #1

  ; Function Attrs: noduplicate nounwind
  declare i32 @llvm.start.loop.iterations.i32(i32) #3

  ; Function Attrs: noduplicate nounwind
  declare i32 @llvm.loop.decrement.reg.i32(i32, i32) #3

  attributes #0 = { "target-features"="+mve.fp" }
  attributes #1 = { nounwind readnone "target-features"="+mve.fp" }
  attributes #2 = { argmemonly nounwind readonly willreturn "target-features"="+mve.fp" }
  attributes #3 = { noduplicate nounwind }

...
---
name:            arm_var_f32_mve
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: '$r4', callee-saved-restored: true,
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
callSites:       []
constants:       []
machineFunctionInfo: {}
body:             |
  ; CHECK-LABEL: name: arm_var_f32_mve
  ; CHECK: bb.0.entry:
  ; CHECK:   successors: %bb.1(0x80000000)
  ; CHECK:   liveins: $lr, $r0, $r1, $r2, $r4
  ; CHECK:   frame-setup tPUSH 14 /* CC::al */, $noreg, killed $r4, 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 $r4, -8
  ; CHECK:   renamable $q0 = MVE_VMOVimmi32 0, 0, $noreg, undef renamable $q0
  ; CHECK:   $r3 = tMOVr $r1, 14 /* CC::al */, $noreg
  ; CHECK:   $r12 = tMOVr $r0, 14 /* CC::al */, $noreg
  ; CHECK:   $lr = MVE_DLSTP_32 killed renamable $r3
  ; CHECK:   $r4 = tMOVr $lr, 14 /* CC::al */, $noreg
  ; CHECK: bb.1.do.body.i:
  ; CHECK:   successors: %bb.1(0x7c000000), %bb.2(0x04000000)
  ; CHECK:   liveins: $lr, $q0, $r0, $r1, $r2, $r4, $r12
  ; CHECK:   renamable $r12, renamable $q1 = MVE_VLDRWU32_post killed renamable $r12, 16, 0, $noreg :: (load 16 from %ir.pSrc.addr.0.i2, align 4)
  ; CHECK:   renamable $q0 = nnan ninf nsz arcp contract afn reassoc MVE_VADDf32 killed renamable $q0, killed renamable $q1, 0, killed $noreg, killed renamable $q0
  ; CHECK:   $lr = MVE_LETP killed renamable $lr, %bb.1
  ; CHECK: bb.2.arm_mean_f32_mve.exit:
  ; CHECK:   successors: %bb.3(0x80000000)
  ; CHECK:   liveins: $q0, $r0, $r1, $r2, $r4
  ; CHECK:   $s4 = VMOVSR $r1, 14 /* CC::al */, $noreg
  ; CHECK:   dead $lr = tMOVr $r4, 14 /* CC::al */, $noreg
  ; CHECK:   renamable $s0 = nnan ninf nsz arcp contract afn reassoc VADDS killed renamable $s3, killed renamable $s3, 14 /* CC::al */, $noreg, implicit killed $q0
  ; CHECK:   $lr = t2DLS killed $r4
  ; CHECK:   renamable $s4 = VUITOS killed renamable $s4, 14 /* CC::al */, $noreg
  ; CHECK:   renamable $s0 = nnan ninf nsz arcp contract afn reassoc VDIVS killed renamable $s0, killed renamable $s4, 14 /* CC::al */, $noreg
  ; CHECK:   renamable $r3 = VMOVRS killed renamable $s0, 14 /* CC::al */, $noreg
  ; CHECK:   renamable $q0 = MVE_VMOVimmi32 0, 0, $noreg, undef renamable $q0
  ; CHECK:   renamable $q1 = MVE_VDUP32 killed renamable $r3, 0, $noreg, undef renamable $q1
  ; CHECK:   $r3 = tMOVr $r1, 14 /* CC::al */, $noreg
  ; CHECK: bb.3.do.body:
  ; CHECK:   successors: %bb.3(0x7c000000), %bb.4(0x04000000)
  ; CHECK:   liveins: $lr, $q0, $q1, $r0, $r1, $r2, $r3
  ; CHECK:   renamable $vpr = MVE_VCTP32 renamable $r3, 0, $noreg
  ; CHECK:   renamable $r3, dead $cpsr = tSUBi8 killed renamable $r3, 4, 14 /* CC::al */, $noreg
  ; CHECK:   MVE_VPST 2, implicit $vpr
  ; CHECK:   renamable $r0, renamable $q2 = MVE_VLDRWU32_post killed renamable $r0, 16, 1, renamable $vpr :: (load 16 from %ir.pSrc.addr.01, align 4)
  ; CHECK:   renamable $q2 = nnan ninf nsz arcp contract afn reassoc MVE_VSUBf32 killed renamable $q2, renamable $q1, 1, renamable $vpr, undef renamable $q2
  ; CHECK:   renamable $q0 = nnan ninf nsz arcp contract afn reassoc MVE_VFMAf32 killed renamable $q0, killed renamable $q2, killed renamable $q2, 1, killed renamable $vpr
  ; CHECK:   $lr = t2LEUpdate killed renamable $lr, %bb.3
  ; CHECK: bb.4.do.end:
  ; CHECK:   liveins: $q0, $r1, $r2
  ; CHECK:   renamable $r0, dead $cpsr = tSUBi3 killed renamable $r1, 1, 14 /* CC::al */, $noreg
  ; CHECK:   renamable $s0 = nnan ninf nsz arcp contract afn reassoc VADDS killed renamable $s3, killed renamable $s3, 14 /* CC::al */, $noreg, implicit killed $q0
  ; CHECK:   $s2 = VMOVSR killed $r0, 14 /* CC::al */, $noreg
  ; CHECK:   renamable $s2 = VUITOS killed renamable $s2, 14 /* CC::al */, $noreg
  ; CHECK:   renamable $s0 = nnan ninf nsz arcp contract afn reassoc VDIVS killed renamable $s0, killed renamable $s2, 14 /* CC::al */, $noreg
  ; CHECK:   VSTRS killed renamable $s0, killed renamable $r2, 0, 14 /* CC::al */, $noreg :: (store 4 into %ir.pResult)
  ; CHECK:   frame-destroy tPOP_RET 14 /* CC::al */, $noreg, def $r4, def $pc
  bb.0.entry:
    successors: %bb.1(0x80000000)
    liveins: $r0, $r1, $r2, $r4, $lr

    frame-setup tPUSH 14 /* CC::al */, $noreg, killed $r4, 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 $r4, -8
    $r3 = tMOVr $r1, 14 /* CC::al */, $noreg
    tCMPi8 renamable $r1, 4, 14 /* CC::al */, $noreg, implicit-def $cpsr
    t2IT 10, 8, implicit-def $itstate
    renamable $r3 = tMOVi8 $noreg, 4, 10 /* CC::ge */, killed $cpsr, implicit killed renamable $r3, implicit killed $itstate
    renamable $r12 = t2MOVi 1, 14 /* CC::al */, $noreg, $noreg
    renamable $r3, dead $cpsr = tSUBrr renamable $r1, killed renamable $r3, 14 /* CC::al */, $noreg
    renamable $q0 = MVE_VMOVimmi32 0, 0, $noreg, undef renamable $q0
    renamable $r3, dead $cpsr = tADDi8 killed renamable $r3, 3, 14 /* CC::al */, $noreg
    renamable $lr = nuw nsw t2ADDrs killed renamable $r12, killed renamable $r3, 19, 14 /* CC::al */, $noreg, $noreg
    $r3 = tMOVr $r1, 14 /* CC::al */, $noreg
    $r12 = tMOVr $r0, 14 /* CC::al */, $noreg
    $lr = t2DoLoopStart renamable $lr
    $r4 = tMOVr $lr, 14 /* CC::al */, $noreg

  bb.1.do.body.i:
    successors: %bb.1(0x7c000000), %bb.2(0x04000000)
    liveins: $lr, $q0, $r0, $r1, $r2, $r3, $r4, $r12

    renamable $vpr = MVE_VCTP32 renamable $r3, 0, $noreg
    renamable $r3, dead $cpsr = tSUBi8 killed renamable $r3, 4, 14 /* CC::al */, $noreg
    renamable $lr = t2LoopDec killed renamable $lr, 1
    MVE_VPST 4, implicit $vpr
    renamable $r12, renamable $q1 = MVE_VLDRWU32_post killed renamable $r12, 16, 1, renamable $vpr :: (load 16 from %ir.pSrc.addr.0.i2, align 4)
    renamable $q0 = nnan ninf nsz arcp contract afn reassoc MVE_VADDf32 killed renamable $q0, killed renamable $q1, 1, killed renamable $vpr, renamable $q0
    t2LoopEnd renamable $lr, %bb.1, implicit-def dead $cpsr
    tB %bb.2, 14 /* CC::al */, $noreg

  bb.2.arm_mean_f32_mve.exit:
    successors: %bb.3(0x80000000)
    liveins: $q0, $r0, $r1, $r2, $r4

    $s4 = VMOVSR $r1, 14 /* CC::al */, $noreg
    $lr = tMOVr $r4, 14 /* CC::al */, $noreg
    renamable $s0 = nnan ninf nsz arcp contract afn reassoc VADDS killed renamable $s3, renamable $s3, 14 /* CC::al */, $noreg, implicit $q0
    $lr = t2DoLoopStart killed $r4
    renamable $s4 = VUITOS killed renamable $s4, 14 /* CC::al */, $noreg
    renamable $s0 = nnan ninf nsz arcp contract afn reassoc VDIVS killed renamable $s0, killed renamable $s4, 14 /* CC::al */, $noreg
    renamable $r3 = VMOVRS killed renamable $s0, 14 /* CC::al */, $noreg
    renamable $q0 = MVE_VMOVimmi32 0, 0, $noreg, undef renamable $q0
    renamable $q1 = MVE_VDUP32 killed renamable $r3, 0, $noreg, undef renamable $q1
    $r3 = tMOVr $r1, 14 /* CC::al */, $noreg

  bb.3.do.body:
    successors: %bb.3(0x7c000000), %bb.4(0x04000000)
    liveins: $lr, $q0, $q1, $r0, $r1, $r2, $r3

    renamable $vpr = MVE_VCTP32 renamable $r3, 0, $noreg
    renamable $r3, dead $cpsr = tSUBi8 killed renamable $r3, 4, 14 /* CC::al */, $noreg
    renamable $lr = t2LoopDec killed renamable $lr, 1
    MVE_VPST 2, implicit $vpr
    renamable $r0, renamable $q2 = MVE_VLDRWU32_post killed renamable $r0, 16, 1, renamable $vpr :: (load 16 from %ir.pSrc.addr.01, align 4)
    renamable $q2 = nnan ninf nsz arcp contract afn reassoc MVE_VSUBf32 killed renamable $q2, renamable $q1, 1, renamable $vpr, undef renamable $q2
    renamable $q0 = nnan ninf nsz arcp contract afn reassoc MVE_VFMAf32 killed renamable $q0, killed renamable $q2, renamable $q2, 1, killed renamable $vpr
    t2LoopEnd renamable $lr, %bb.3, implicit-def dead $cpsr
    tB %bb.4, 14 /* CC::al */, $noreg

  bb.4.do.end:
    liveins: $q0, $r1, $r2

    renamable $r0, dead $cpsr = tSUBi3 killed renamable $r1, 1, 14 /* CC::al */, $noreg
    renamable $s0 = nnan ninf nsz arcp contract afn reassoc VADDS killed renamable $s3, renamable $s3, 14 /* CC::al */, $noreg, implicit $q0
    $s2 = VMOVSR killed $r0, 14 /* CC::al */, $noreg
    renamable $s2 = VUITOS killed renamable $s2, 14 /* CC::al */, $noreg
    renamable $s0 = nnan ninf nsz arcp contract afn reassoc VDIVS killed renamable $s0, killed renamable $s2, 14 /* CC::al */, $noreg
    VSTRS killed renamable $s0, killed renamable $r2, 0, 14 /* CC::al */, $noreg :: (store 4 into %ir.pResult)
    frame-destroy tPOP_RET 14 /* CC::al */, $noreg, def $r4, def $pc

...