; LLVM IR from SSBMTonberry/pocketlzma :: ref_spec/lzma1900/CPP/Common/MyString.ll (Z19MyStringLower_AsciiPc)

; Unoptimized IR (clang -disable-llvm-passes):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z19MyStringLower_AsciiPc(ptr noundef %0) #1 personality ptr @__gxx_personality_v0 {
  %2 = alloca ptr, align 8
  %3 = alloca i8, align 1
  %4 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  br label %5

5:                                                ; preds = %20, %1
  call void @llvm.lifetime.start.p0(i64 1, ptr %3) #4
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  %7 = load i8, ptr %6, align 1, !tbaa !9
  store i8 %7, ptr %3, align 1, !tbaa !9
  %8 = load i8, ptr %3, align 1, !tbaa !9
  %9 = sext i8 %8 to i32
  %10 = icmp eq i32 %9, 0
  br i1 %10, label %11, label %12

11:                                               ; preds = %5
  store i32 1, ptr %4, align 4
  br label %18

12:                                               ; preds = %5
  %13 = load i8, ptr %3, align 1, !tbaa !9
  %14 = invoke noundef signext i8 @_Z17MyCharLower_Asciic(i8 noundef signext %13)
          to label %15 unwind label %22

15:                                               ; preds = %12
  %16 = load ptr, ptr %2, align 8, !tbaa !5
  %17 = getelementptr inbounds i8, ptr %16, i32 1
  store ptr %17, ptr %2, align 8, !tbaa !5
  store i8 %14, ptr %16, align 1, !tbaa !9
  store i32 0, ptr %4, align 4
  br label %18

18:                                               ; preds = %15, %11
  call void @llvm.lifetime.end.p0(i64 1, ptr %3) #4
  %19 = load i32, ptr %4, align 4
  switch i32 %19, label %25 [
    i32 0, label %20
    i32 1, label %21
  ]

20:                                               ; preds = %18
  br label %5, !llvm.loop !10

21:                                               ; preds = %18
  ret void

22:                                               ; preds = %12
  %23 = landingpad { ptr, i32 }
          catch ptr null
  %24 = extractvalue { ptr, i32 } %23, 0
  call void @__clang_call_terminate(ptr %24) #5
  unreachable

25:                                               ; preds = %18
  unreachable
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef signext i8 @_Z17MyCharLower_Asciic(i8 noundef signext) #2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: noinline noreturn nounwind uwtable
declare hidden void @__clang_call_terminate(ptr noundef) #3

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #2 = { inlinehint mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #3 = { noinline noreturn nounwind uwtable "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #4 = { nounwind }
attributes #5 = { noreturn nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}


; Optimized IR (opt -passes='default<O3>'):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z19MyStringLower_AsciiPc(ptr nocapture noundef %0) local_unnamed_addr #0 personality ptr @__gxx_personality_v0 {
  %2 = load i8, ptr %0, align 1, !tbaa !5
  %3 = icmp eq i8 %2, 0
  br i1 %3, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %.lr.ph
  %4 = phi i8 [ %7, %.lr.ph ], [ %2, %1 ]
  %.047 = phi ptr [ %6, %.lr.ph ], [ %0, %1 ]
  %5 = tail call noundef signext i8 @_Z17MyCharLower_Asciic(i8 noundef signext %4)
  %6 = getelementptr inbounds i8, ptr %.047, i64 1
  store i8 %5, ptr %.047, align 1, !tbaa !5
  %7 = load i8, ptr %6, align 1, !tbaa !5
  %8 = icmp eq i8 %7, 0
  br i1 %8, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %1
  ret void
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef signext i8 @_Z17MyCharLower_Asciic(i8 noundef signext) local_unnamed_addr #1

declare i32 @__gxx_personality_v0(...)

attributes #0 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { inlinehint mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}


; Effective O3 passes: GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass