llvm/test/CodeGen/Thumb2/LowOverheadLoops/it-block-itercount.mir

# 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

# IT-block with 2 statements, which we don't support yet, so check that we do
# not remove any of the iteration count statements.

--- |
  define hidden arm_aapcs_vfpcc void @it_block_2_stmts(float* %pSrc, float* %pDst, i32 %blockSize) local_unnamed_addr #0 {
  entry:
    %mul = shl i32 %blockSize, 1
    %0 = add i32 %mul, 3
    %1 = icmp slt i32 %mul, 4
    %smin = select i1 %1, i32 %mul, i32 4
    %2 = sub i32 %0, %smin
    %3 = lshr i32 %2, 2
    %4 = add nuw nsw i32 %3, 1
    call void @llvm.set.loop.iterations.i32(i32 %4)
    br label %do.body

  do.body:                                          ; preds = %do.body, %entry
    %blkCnt.0 = phi i32 [ %mul, %entry ], [ %sub, %do.body ]
    %pDst.addr.0 = phi float* [ %pDst, %entry ], [ %add.ptr4, %do.body ]
    %pSrc.addr.0 = phi float* [ %pSrc, %entry ], [ %add.ptr, %do.body ]
    %5 = phi i32 [ %4, %entry ], [ %9, %do.body ]
    %6 = tail call <4 x i1> @llvm.arm.mve.vctp32(i32 %blkCnt.0)
    %input_cast = bitcast float* %pSrc.addr.0 to <4 x float>*
    %7 = tail call <4 x float> @llvm.masked.load.v4f32.p0v4f32(<4 x float>* %input_cast, i32 4, <4 x i1> %6, <4 x float> undef)
    %8 = fmul <4 x float> %7, <float 1.000000e+00, float -1.000000e+00, float 1.000000e+00, float -1.000000e+00>
    %output_cast = bitcast float* %pDst.addr.0 to <4 x float>*
    tail call void @llvm.masked.store.v4f32.p0v4f32(<4 x float> %8, <4 x float>* %output_cast, i32 4, <4 x i1> %6)
    %add.ptr = getelementptr inbounds float, float* %pSrc.addr.0, i32 4
    %add.ptr4 = getelementptr inbounds float, float* %pDst.addr.0, i32 4
    %sub = add nsw i32 %blkCnt.0, -4
    %9 = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %5, i32 1)
    %10 = icmp ne i32 %9, 0
    br i1 %10, label %do.body, label %do.end

  do.end:                                           ; preds = %do.body
    ret void
  }
  declare <4 x i1> @llvm.arm.mve.vctp32(i32) #1
  declare <4 x float> @llvm.masked.load.v4f32.p0v4f32(<4 x float>*, i32 immarg, <4 x i1>, <4 x float>)
  declare void @llvm.masked.store.v4f32.p0v4f32(<4 x float>, <4 x float>*, i32 immarg, <4 x i1>)
  declare void @llvm.set.loop.iterations.i32(i32)
  declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32)

...
---
name:            it_block_2_stmts
alignment:       16
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:
  - id:              0
    value:           '<4 x float> <float 1.000000e+00, float -1.000000e+00, float 1.000000e+00, float -1.000000e+00>'
    alignment:       16
    isTargetSpecific: false
machineFunctionInfo: {}
body:             |
  ; CHECK-LABEL: name: it_block_2_stmts
  ; CHECK: bb.0.entry:
  ; CHECK:   successors: %bb.1(0x80000000)
  ; CHECK:   liveins: $lr, $r0, $r1, $r2, $r7
  ; CHECK:   frame-setup tPUSH 14, $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 $r3, dead $cpsr = tLSLri renamable $r2, 1, 14, $noreg
  ; CHECK:   renamable $r12 = t2MOVi 4, 14, $noreg, $noreg
  ; CHECK:   tCMPi8 renamable $r3, 4, 14, $noreg, implicit-def $cpsr
  ; CHECK:   t2IT 11, 8, implicit-def $itstate
  ; CHECK:   $r12 = t2LSLri renamable $r2, 1, 11, $cpsr, $noreg, implicit killed renamable $r12, implicit $itstate
  ; CHECK:   $r12 = t2LSLri renamable $r2, 1, 11, killed $cpsr, $noreg, implicit killed renamable $r12, implicit killed $itstate
  ; CHECK:   renamable $r2 = t2RSBrs killed renamable $r12, killed renamable $r2, 10, 14, $noreg, $noreg
  ; CHECK:   renamable $r12 = t2ADDri killed renamable $r2, 3, 14, $noreg, $noreg
  ; CHECK:   renamable $r2, dead $cpsr = tMOVi8 1, 14, $noreg
  ; CHECK:   dead renamable $lr = nuw nsw t2ADDrs killed renamable $r2, killed renamable $r12, 19, 14, $noreg, $noreg
  ; CHECK:   renamable $r2 = tLEApcrel %const.0, 14, $noreg
  ; CHECK:   renamable $q0 = MVE_VLDRWU32 killed renamable $r2, 0, 0, $noreg :: (load 16 from constant-pool)
  ; CHECK:   $lr = MVE_DLSTP_32 killed renamable $r3
  ; CHECK: bb.1.do.body (align 4):
  ; CHECK:   successors: %bb.1(0x7c000000), %bb.2(0x04000000)
  ; CHECK:   liveins: $lr, $q0, $r0, $r1
  ; CHECK:   renamable $q1 = nnan ninf nsz MVE_VLDRWU32 renamable $r0, 0, 0, $noreg
  ; CHECK:   renamable $q1 = nnan ninf nsz MVE_VMULf32 killed renamable $q1, renamable $q0, 0, $noreg, undef renamable $q1
  ; CHECK:   MVE_VSTRWU32 killed renamable $q1, renamable $r1, 0, 0, killed $noreg
  ; CHECK:   renamable $r0, dead $cpsr = nuw tADDi8 killed renamable $r0, 16, 14, $noreg
  ; CHECK:   renamable $r1, dead $cpsr = nuw tADDi8 killed renamable $r1, 16, 14, $noreg
  ; CHECK:   $lr = MVE_LETP killed renamable $lr, %bb.1
  ; CHECK: bb.2.do.end:
  ; CHECK:   tPOP_RET 14, $noreg, def $r7, def $pc
  ; CHECK: bb.3 (align 16):
  ; CHECK:   CONSTPOOL_ENTRY 0, %const.0, 16
  bb.0.entry:
    successors: %bb.1(0x80000000)
    liveins: $r0, $r1, $r2, $r7, $lr

    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 = tLSLri renamable $r2, 1, 14, $noreg
    renamable $r12 = t2MOVi 4, 14, $noreg, $noreg
    tCMPi8 renamable $r3, 4, 14, $noreg, implicit-def $cpsr
    t2IT 11, 8, implicit-def $itstate
    $r12 = t2LSLri renamable $r2, 1, 11, $cpsr, $noreg, implicit renamable $r12, implicit $itstate
    $r12 = t2LSLri renamable $r2, 1, 11, killed $cpsr, $noreg, implicit killed renamable $r12, implicit killed $itstate
    renamable $r2 = t2RSBrs killed renamable $r12, killed renamable $r2, 10, 14, $noreg, $noreg
    renamable $r12 = t2ADDri killed renamable $r2, 3, 14, $noreg, $noreg
    renamable $r2, dead $cpsr = tMOVi8 1, 14, $noreg
    renamable $lr = nuw nsw t2ADDrs killed renamable $r2, killed renamable $r12, 19, 14, $noreg, $noreg
    renamable $r2 = tLEApcrel %const.0, 14, $noreg
    renamable $q0 = MVE_VLDRWU32 killed renamable $r2, 0, 0, $noreg :: (load 16 from constant-pool)
    t2DoLoopStart renamable $lr

  bb.1.do.body (align 4):
    successors: %bb.1(0x7c000000), %bb.2(0x04000000)
    liveins: $lr, $q0, $r0, $r1, $r3

    renamable $vpr = MVE_VCTP32 renamable $r3, 0, $noreg
    MVE_VPST 2, implicit $vpr
    renamable $q1 = nnan ninf nsz MVE_VLDRWU32 renamable $r0, 0, 1, renamable $vpr
    renamable $q1 = nnan ninf nsz MVE_VMULf32 killed renamable $q1, renamable $q0, 1, renamable $vpr, undef renamable $q1
    MVE_VSTRWU32 killed renamable $q1, renamable $r1, 0, 1, killed renamable $vpr
    renamable $r0, dead $cpsr = nuw tADDi8 killed renamable $r0, 16, 14, $noreg
    renamable $lr = t2LoopDec killed renamable $lr, 1
    renamable $r1, dead $cpsr = nuw tADDi8 killed renamable $r1, 16, 14, $noreg
    renamable $r3, dead $cpsr = nsw tSUBi8 killed renamable $r3, 4, 14, $noreg
    t2LoopEnd renamable $lr, %bb.1, implicit-def dead $cpsr
    tB %bb.2, 14, $noreg

  bb.2.do.end:
    tPOP_RET 14, $noreg, def $r7, def $pc

  bb.3 (align 16):
    CONSTPOOL_ENTRY 0, %const.0, 16

...