llvm-project/llvm/test/CodeGen/AArch64/wineh-frame6.mir

# RUN: llc -o - %s -mtriple=aarch64-windows -start-before=prologepilog \
# RUN:   -stop-after=prologepilog | FileCheck %s
# Test that stack probe results in Nop unwind codes in the prologue.  Test
# save_fplr, save_reg_x and stack_alloc with multiple updates

# CHECK:      early-clobber $sp = frame-setup STPXpre killed $fp, killed $lr, $sp, -2
# CHECK-NEXT: frame-setup SEH_SaveFPLR_X -16
# CHECK-NEXT: $fp = frame-setup ADDXri $sp, 0, 0
# CHECK-NEXT: frame-setup SEH_SetFP
# CHECK-NEXT: $sp = frame-setup SUBXri $sp, 32, 0
# CHECK-NEXT: frame-setup SEH_StackAlloc 32
# CHECK-NEXT: frame-setup SEH_PrologEnd
# CHECK:      frame-destroy SEH_EpilogStart
# CHECK-NEXT: $sp = frame-destroy ADDXri $fp, 0, 0
# CHECK-NEXT: frame-destroy SEH_SetFP
# CHECK-NEXT: early-clobber $sp, $fp, $lr = frame-destroy LDPXpost $sp, 2
# CHECK-NEXT: frame-destroy SEH_SaveFPLR_X -16
# CHECK-NEXT: frame-destroy SEH_EpilogEnd
# CHECK-NEXT: RET_ReallyLR implicit killed $w0
--- |
  target datalayout = "e-m:w-p:64:64-i32:32-i64:64-i128:128-n32:64-S128"
  target triple = "aarch64-unknown-windows-msvc19.11.0"

  ; Function Attrs: noinline optnone
  define dso_local i32 @"?func@@YAHHHHH@Z"(i32 %n, i32 %idx, i32 %b, i32 %c) #0 {
  entry:
    %c.addr = alloca i32, align 4
    %b.addr = alloca i32, align 4
    %idx.addr = alloca i32, align 4
    %n.addr = alloca i32, align 4
    %a = alloca i32*, align 8
    store i32 %c, i32* %c.addr, align 4
    store i32 %b, i32* %b.addr, align 4
    store i32 %idx, i32* %idx.addr, align 4
    store i32 %n, i32* %n.addr, align 4
    %0 = load i32, i32* %n.addr, align 4
    %conv = sext i32 %0 to i64
    %1 = alloca i8, i64 %conv, align 16
    %2 = bitcast i8* %1 to i32*
    store i32* %2, i32** %a, align 8
    %3 = load i32*, i32** %a, align 8
    call void @"?init@@YAXPEAH@Z"(i32* %3)
    ret i32 0
  }

  declare dso_local void @"?init@@YAXPEAH@Z"(i32*) #1

  ; Function Attrs: nounwind
  declare void @llvm.stackprotector(i8*, i8**) #2

  attributes #0 = { noinline optnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="generic" "target-features"="+neon" "unsafe-fp-math"="false" "use-soft-float"="false" }
  attributes #1 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="generic" "target-features"="+neon" "unsafe-fp-math"="false" "use-soft-float"="false" }
  attributes #2 = { nounwind }

...
---
name:            '?func@@YAHHHHH@Z'
alignment:       2
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
failedISel:      false
tracksRegLiveness: true
hasWinCFI:       false
registers:
liveins:
  - { reg: '$w0', virtual-reg: '' }
  - { reg: '$w1', virtual-reg: '' }
  - { reg: '$w2', virtual-reg: '' }
  - { reg: '$w3', virtual-reg: '' }
frameInfo:
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  hasStackMap:     false
  hasPatchPoint:   false
  stackSize:       0
  offsetAdjustment: 0
  maxAlignment:    8
  adjustsStack:    true
  hasCalls:        true
  stackProtector:  ''
  maxCallFrameSize: 0
  cvBytesOfCalleeSavedRegisters: 0
  hasOpaqueSPAdjustment: false
  hasVAStart:      false
  hasMustTailInVarArgFunc: false
  localFrameSize:  24
  savePoint:       ''
  restorePoint:    ''
fixedStack:
stack:
  - { id: 0, name: c.addr, type: default, offset: 0, size: 4, alignment: 4,
      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
      local-offset: -4, debug-info-variable: '', debug-info-expression: '',
      debug-info-location: '' }
  - { id: 1, name: b.addr, type: default, offset: 0, size: 4, alignment: 4,
      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
      local-offset: -8, debug-info-variable: '', debug-info-expression: '',
      debug-info-location: '' }
  - { id: 2, name: idx.addr, type: default, offset: 0, size: 4, alignment: 4,
      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
      local-offset: -12, debug-info-variable: '', debug-info-expression: '',
      debug-info-location: '' }
  - { id: 3, name: n.addr, type: default, offset: 0, size: 4, alignment: 4,
      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
      local-offset: -16, debug-info-variable: '', debug-info-expression: '',
      debug-info-location: '' }
  - { id: 4, name: a, type: default, offset: 0, size: 8, alignment: 8,
      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
      local-offset: -24, debug-info-variable: '', debug-info-expression: '',
      debug-info-location: '' }
  - { id: 5, name: '', type: variable-sized, offset: 0,
      alignment: 1, stack-id: default, callee-saved-register: '', callee-saved-restored: true,
      local-offset: -24, debug-info-variable: '', debug-info-expression: '',
      debug-info-location: '' }
  - { id: 6, name: '', type: spill-slot, offset: 0, size: 8, alignment: 8,
      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
constants:
body:             |
  bb.0.entry:
    liveins: $w0, $w1, $w2, $w3

    STRWui killed renamable $w3, %stack.0.c.addr, 0 :: (store 4 into %ir.c.addr)
    STRWui killed renamable $w2, %stack.1.b.addr, 0 :: (store 4 into %ir.b.addr)
    STRWui killed renamable $w1, %stack.2.idx.addr, 0 :: (store 4 into %ir.idx.addr)
    STRWui killed renamable $w0, %stack.3.n.addr, 0 :: (store 4 into %ir.n.addr)
    renamable $x8 = LDRSWui %stack.3.n.addr, 0 :: (dereferenceable load 4 from %ir.n.addr)
    ADJCALLSTACKDOWN 0, 0, implicit-def dead $sp, implicit $sp
    renamable $x8 = nuw ADDXri killed renamable $x8, 15, 0
    renamable $x8 = UBFMXri killed renamable $x8, 4, 63
    $x15 = COPY renamable $x8
    STRXui killed $x8, %stack.6, 0 :: (store 8 into %stack.6)
    BL &__chkstk, csr_aarch64_stackprobe_windows, implicit-def dead $lr, implicit $sp, implicit killed $x15
    renamable $x8 = COPY $sp
    $x15 = LDRXui %stack.6, 0 :: (load 8 from %stack.6)
    renamable $x8 = SUBSXrs killed renamable $x8, killed renamable $x15, 4, implicit-def dead $nzcv
    $sp = COPY renamable $x8
    ADJCALLSTACKUP 0, 0, implicit-def dead $sp, implicit $sp
    STRXui killed renamable $x8, %stack.4.a, 0 :: (store 8 into %ir.a)
    renamable $x0 = LDRXui %stack.4.a, 0 :: (dereferenceable load 8 from %ir.a)
    ADJCALLSTACKDOWN 0, 0, implicit-def dead $sp, implicit $sp
    BL @"?init@@YAXPEAH@Z", csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $x0, implicit-def $sp
    ADJCALLSTACKUP 0, 0, implicit-def dead $sp, implicit $sp
    renamable $w1 = COPY $wzr
    $w0 = COPY killed renamable $w1
    RET_ReallyLR implicit killed $w0

...