llvm/test/CodeGen/AArch64/loop-sink-limit.mir

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple aarch64 -run-pass=machine-sink -sink-insts-to-avoid-spills \
# RUN:   -machine-sink-cycle-limit=1 -verify-machineinstrs %s -o - 2>&1 | \
# RUN:   FileCheck %s --check-prefix=SINK1
#
# RUN: llc -mtriple aarch64 -run-pass=machine-sink -sink-insts-to-avoid-spills \
# RUN:   -machine-sink-cycle-limit=2 -verify-machineinstrs %s -o - 2>&1 | \
# RUN:   FileCheck %s --check-prefix=SINK2

--- |
  target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
  target triple = "aarch64"

  @A = external dso_local global [100 x i32], align 4
  %struct.A = type { i32, i32, i32, i32, i32, i32 }

  define i32 @do_sink_use_is_not_a_copy(i32 %n) {
  entry:
    %cmp63 = icmp sgt i32 %n, 0
    br i1 %cmp63, label %for.body.preheader, label %for.cond.cleanup

  for.body.preheader:                               ; preds = %entry
    %0 = load i32, ptr @A, align 4
    br label %for.body

  for.cond.cleanup:                                 ; preds = %for.body, %entry
    %sum.0.lcssa = phi i32 [ %n, %entry ], [ %div, %for.body ]
    ret i32 %sum.0.lcssa

  for.body:                                         ; preds = %for.body, %for.body.preheader
    %lsr.iv = phi i32 [ %n, %for.body.preheader ], [ %lsr.iv.next, %for.body ]
    %sum.065 = phi i32 [ %div, %for.body ], [ %n, %for.body.preheader ]
    %div = sdiv i32 %sum.065, %0
    %lsr.iv.next = add i32 %lsr.iv, -1
    %exitcond.not = icmp eq i32 %lsr.iv.next, 0
    br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
  }

...
---
name:            do_sink_use_is_not_a_copy
alignment:       4
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
failedISel:      false
tracksRegLiveness: true
hasWinCFI:       false
registers:
  - { id: 0, class: gpr32, preferred-register: '' }
  - { id: 1, class: gpr32all, preferred-register: '' }
  - { id: 2, class: gpr32sp, preferred-register: '' }
  - { id: 3, class: gpr32, preferred-register: '' }
  - { id: 4, class: gpr32all, preferred-register: '' }
  - { id: 5, class: gpr32all, preferred-register: '' }
  - { id: 6, class: gpr32common, preferred-register: '' }
  - { id: 7, class: gpr32, preferred-register: '' }
  - { id: 8, class: gpr64common, preferred-register: '' }
  - { id: 9, class: gpr32, preferred-register: '' }
  - { id: 10, class: gpr32, preferred-register: '' }
  - { id: 11, class: gpr32, preferred-register: '' }
liveins:
  - { reg: '$w0', virtual-reg: '%6' }
frameInfo:
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  hasStackMap:     false
  hasPatchPoint:   false
  stackSize:       0
  offsetAdjustment: 0
  maxAlignment:    1
  adjustsStack:    false
  hasCalls:        false
  stackProtector:  ''
  maxCallFrameSize: 0
  cvBytesOfCalleeSavedRegisters: 0
  hasOpaqueSPAdjustment: false
  hasVAStart:      false
  hasMustTailInVarArgFunc: false
  localFrameSize:  0
  savePoint:       ''
  restorePoint:    ''
fixedStack:      []
stack:           []
callSites:       []
debugValueSubstitutions: []
constants:       []
machineFunctionInfo: {}
body:             |
  ; SINK1-LABEL: name: do_sink_use_is_not_a_copy
  ; SINK1: bb.0.entry:
  ; SINK1:   successors: %bb.1(0x50000000), %bb.2(0x30000000)
  ; SINK1:   liveins: $w0
  ; SINK1:   [[COPY:%[0-9]+]]:gpr32common = COPY $w0
  ; SINK1:   [[SUBSWri:%[0-9]+]]:gpr32 = SUBSWri [[COPY]], 1, 0, implicit-def $nzcv
  ; SINK1:   Bcc 11, %bb.2, implicit $nzcv
  ; SINK1:   B %bb.1
  ; SINK1: bb.1.for.body.preheader:
  ; SINK1:   successors: %bb.3(0x80000000)
  ; SINK1:   [[ADRP:%[0-9]+]]:gpr64common = ADRP target-flags(aarch64-page) @A
  ; SINK1:   [[LDRWui:%[0-9]+]]:gpr32 = LDRWui killed [[ADRP]], target-flags(aarch64-pageoff, aarch64-nc) @A :: (dereferenceable load (s32) from @A)
  ; SINK1:   B %bb.3
  ; SINK1: bb.2.for.cond.cleanup:
  ; SINK1:   [[PHI:%[0-9]+]]:gpr32all = PHI [[COPY]], %bb.0, %4, %bb.3
  ; SINK1:   $w0 = COPY [[PHI]]
  ; SINK1:   RET_ReallyLR implicit $w0
  ; SINK1: bb.3.for.body:
  ; SINK1:   successors: %bb.2(0x04000000), %bb.3(0x7c000000)
  ; SINK1:   [[PHI1:%[0-9]+]]:gpr32sp = PHI [[COPY]], %bb.1, %5, %bb.3
  ; SINK1:   [[PHI2:%[0-9]+]]:gpr32 = PHI [[COPY]], %bb.1, %4, %bb.3
  ; SINK1:   [[SDIVWr:%[0-9]+]]:gpr32 = SDIVWr [[PHI2]], [[LDRWui]]
  ; SINK1:   [[COPY1:%[0-9]+]]:gpr32all = COPY [[SDIVWr]]
  ; SINK1:   [[SUBSWri1:%[0-9]+]]:gpr32 = SUBSWri [[PHI1]], 1, 0, implicit-def $nzcv
  ; SINK1:   [[COPY2:%[0-9]+]]:gpr32all = COPY [[SUBSWri1]]
  ; SINK1:   Bcc 0, %bb.2, implicit $nzcv
  ; SINK1:   B %bb.3
  ; SINK2-LABEL: name: do_sink_use_is_not_a_copy
  ; SINK2: bb.0.entry:
  ; SINK2:   successors: %bb.1(0x50000000), %bb.2(0x30000000)
  ; SINK2:   liveins: $w0
  ; SINK2:   [[COPY:%[0-9]+]]:gpr32common = COPY $w0
  ; SINK2:   [[SUBSWri:%[0-9]+]]:gpr32 = SUBSWri [[COPY]], 1, 0, implicit-def $nzcv
  ; SINK2:   Bcc 11, %bb.2, implicit $nzcv
  ; SINK2:   B %bb.1
  ; SINK2: bb.1.for.body.preheader:
  ; SINK2:   successors: %bb.3(0x80000000)
  ; SINK2:   [[ADRP:%[0-9]+]]:gpr64common = ADRP target-flags(aarch64-page) @A
  ; SINK2:   [[LDRWui:%[0-9]+]]:gpr32 = LDRWui killed [[ADRP]], target-flags(aarch64-pageoff, aarch64-nc) @A :: (dereferenceable load (s32) from @A)
  ; SINK2:   B %bb.3
  ; SINK2: bb.2.for.cond.cleanup:
  ; SINK2:   [[PHI:%[0-9]+]]:gpr32all = PHI [[COPY]], %bb.0, %4, %bb.3
  ; SINK2:   $w0 = COPY [[PHI]]
  ; SINK2:   RET_ReallyLR implicit $w0
  ; SINK2: bb.3.for.body:
  ; SINK2:   successors: %bb.2(0x04000000), %bb.3(0x7c000000)
  ; SINK2:   [[PHI1:%[0-9]+]]:gpr32sp = PHI [[COPY]], %bb.1, %5, %bb.3
  ; SINK2:   [[PHI2:%[0-9]+]]:gpr32 = PHI [[COPY]], %bb.1, %4, %bb.3
  ; SINK2:   [[SDIVWr:%[0-9]+]]:gpr32 = SDIVWr [[PHI2]], [[LDRWui]]
  ; SINK2:   [[COPY1:%[0-9]+]]:gpr32all = COPY [[SDIVWr]]
  ; SINK2:   [[SUBSWri1:%[0-9]+]]:gpr32 = SUBSWri [[PHI1]], 1, 0, implicit-def $nzcv
  ; SINK2:   [[COPY2:%[0-9]+]]:gpr32all = COPY [[SUBSWri1]]
  ; SINK2:   Bcc 0, %bb.2, implicit $nzcv
  ; SINK2:   B %bb.3
  bb.0.entry:
    successors: %bb.1(0x50000000), %bb.2(0x30000000)
    liveins: $w0

    %6:gpr32common = COPY $w0
    %7:gpr32 = SUBSWri %6, 1, 0, implicit-def $nzcv
    Bcc 11, %bb.2, implicit $nzcv
    B %bb.1

  bb.1.for.body.preheader:
    successors: %bb.3(0x80000000)

    %8:gpr64common = ADRP target-flags(aarch64-page) @A
    %9:gpr32 = LDRWui killed %8, target-flags(aarch64-pageoff, aarch64-nc) @A :: (dereferenceable load (s32) from @A)
    B %bb.3

  bb.2.for.cond.cleanup:
    %1:gpr32all = PHI %6, %bb.0, %4, %bb.3
    $w0 = COPY %1
    RET_ReallyLR implicit $w0

  bb.3.for.body:
    successors: %bb.2(0x04000000), %bb.3(0x7c000000)

    %2:gpr32sp = PHI %6, %bb.1, %5, %bb.3
    %3:gpr32 = PHI %6, %bb.1, %4, %bb.3
    %10:gpr32 = SDIVWr %3, %9
    %4:gpr32all = COPY %10
    %11:gpr32 = SUBSWri %2, 1, 0, implicit-def $nzcv
    %5:gpr32all = COPY %11
    Bcc 0, %bb.2, implicit $nzcv
    B %bb.3

...