llvm/test/CodeGen/AArch64/wineh9.mir

# RUN: llc -o - %s -mtriple=aarch64-windows -run-pass=aarch64-ldst-opt \
# RUN:   | FileCheck %s

# CHECK: $x0 = LDRXui $sp, 1
# CHECK: $x19 = frame-destroy LDRXui $sp, 2

--- |
  target triple = "aarch64-pc-windows-gnu"
  
  define dso_local noundef i64 @_Z1fPFvPxEx(ptr nocapture noundef readonly %g, i64 noundef %x) uwtable {
  entry:
    %x.addr = alloca i64, align 8
    store i64 %x, ptr %x.addr, align 8
    call void %g(ptr noundef nonnull %x.addr)
    call void asm sideeffect "", "~{x19}"()
    %0 = load i64, ptr %x.addr, align 8
    ret i64 %0
  }
...
---
name:            _Z1fPFvPxEx
alignment:       4
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
failedISel:      false
tracksRegLiveness: true
hasWinCFI:       true
callsEHReturn:   false
callsUnwindInit: false
hasEHContTarget: false
hasEHScopes:     false
hasEHFunclets:   false
failsVerification: false
tracksDebugUserValues: true
registers:       []
liveins:
  - { reg: '$x0', virtual-reg: '' }
  - { reg: '$x1', virtual-reg: '' }
frameInfo:
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  hasStackMap:     false
  hasPatchPoint:   false
  stackSize:       32
  offsetAdjustment: 0
  maxAlignment:    8
  adjustsStack:    true
  hasCalls:        true
  stackProtector:  ''
  functionContext: ''
  maxCallFrameSize: 0
  cvBytesOfCalleeSavedRegisters: 0
  hasOpaqueSPAdjustment: false
  hasVAStart:      false
  hasMustTailInVarArgFunc: false
  hasTailCall:     false
  localFrameSize:  8
  savePoint:       ''
  restorePoint:    ''
fixedStack:      []
stack:
  - { id: 0, name: x.addr, type: default, offset: -24, size: 8, alignment: 8, 
      stack-id: default, callee-saved-register: '', callee-saved-restored: true, 
      local-offset: -8, debug-info-variable: '', debug-info-expression: '', 
      debug-info-location: '' }
  - { id: 1, name: '', type: spill-slot, offset: -8, size: 8, alignment: 8, 
      stack-id: default, callee-saved-register: '$lr', callee-saved-restored: true, 
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
  - { id: 2, name: '', type: spill-slot, offset: -16, size: 8, alignment: 8, 
      stack-id: default, callee-saved-register: '$x19', callee-saved-restored: true, 
      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
callSites:       []
debugValueSubstitutions: []
constants:       []
machineFunctionInfo:
  hasRedZone:      false
body:             |
  bb.0.entry:
    liveins: $x0, $x1, $x19, $lr
  
    $sp = frame-setup SUBXri $sp, 32, 0
    frame-setup SEH_StackAlloc 32
    frame-setup STRXui killed $x19, $sp, 2 :: (store (s64) into %stack.2)
    frame-setup SEH_SaveReg 19, 16
    frame-setup STRXui killed $lr, $sp, 3 :: (store (s64) into %stack.1)
    frame-setup SEH_SaveReg 30, 24
    frame-setup SEH_PrologEnd
    renamable $x8 = COPY $x0
    STRXui killed renamable $x1, $sp, 1 :: (store (s64) into %ir.x.addr)
    $x0 = ADDXri $sp, 8, 0
    BLR killed renamable $x8, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit $x0, implicit-def $sp
    INLINEASM &"", 1 /* sideeffect attdialect */, 12 /* clobber */, implicit-def dead early-clobber $x19
    renamable $x0 = LDRXui $sp, 1 :: (dereferenceable load (s64) from %ir.x.addr)
    frame-destroy SEH_EpilogStart
    $lr = frame-destroy LDRXui $sp, 3 :: (load (s64) from %stack.1)
    frame-destroy SEH_SaveReg 30, 24
    $x19 = frame-destroy LDRXui $sp, 2 :: (load (s64) from %stack.2)
    frame-destroy SEH_SaveReg 19, 16
    $sp = frame-destroy ADDXri $sp, 32, 0
    frame-destroy SEH_StackAlloc 32
    frame-destroy SEH_EpilogEnd
    RET_ReallyLR implicit $x0

...