; LLVM IR from SSBMTonberry/pocketlzma :: ref_spec/lzma1900/CPP/Common/MyString.ll (ZNK7AString25IsPrefixedBy_Ascii_NoCaseEPKc)

; 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"

%class.AString = type { ptr, i32, i32 }

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

declare i32 @__gxx_personality_v0(...)

; Function Attrs: noinline noreturn nounwind uwtable
declare hidden void @__clang_call_terminate(ptr noundef) #2

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_ZNK7AString25IsPrefixedBy_Ascii_NoCaseEPKc(ptr noundef nonnull align 8 dereferenceable(16) %0, ptr noundef %1) #3 align 2 personality ptr @__gxx_personality_v0 {
  %3 = alloca i1, align 1
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i8, align 1
  %8 = alloca i32, align 4
  %9 = alloca i8, align 1
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %10 = load ptr, ptr %4, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #4
  %11 = getelementptr inbounds %class.AString, ptr %10, i32 0, i32 0
  %12 = load ptr, ptr %11, align 8, !tbaa !9
  store ptr %12, ptr %6, align 8, !tbaa !5
  br label %13

13:                                               ; preds = %39, %2
  call void @llvm.lifetime.start.p0(i64 1, ptr %7) #4
  %14 = load ptr, ptr %5, align 8, !tbaa !5
  %15 = getelementptr inbounds i8, ptr %14, i32 1
  store ptr %15, ptr %5, align 8, !tbaa !5
  %16 = load i8, ptr %14, align 1, !tbaa !12
  store i8 %16, ptr %7, align 1, !tbaa !12
  %17 = load i8, ptr %7, align 1, !tbaa !12
  %18 = sext i8 %17 to i32
  %19 = icmp eq i32 %18, 0
  br i1 %19, label %20, label %21

20:                                               ; preds = %13
  store i1 true, ptr %3, align 1
  store i32 1, ptr %8, align 4
  br label %37

21:                                               ; preds = %13
  call void @llvm.lifetime.start.p0(i64 1, ptr %9) #4
  %22 = load ptr, ptr %6, align 8, !tbaa !5
  %23 = getelementptr inbounds i8, ptr %22, i32 1
  store ptr %23, ptr %6, align 8, !tbaa !5
  %24 = load i8, ptr %22, align 1, !tbaa !12
  store i8 %24, ptr %9, align 1, !tbaa !12
  %25 = load i8, ptr %9, align 1, !tbaa !12
  %26 = invoke noundef signext i8 @_Z17MyCharLower_Asciic(i8 noundef signext %25)
          to label %27 unwind label %42

27:                                               ; preds = %21
  %28 = sext i8 %26 to i32
  %29 = load i8, ptr %7, align 1, !tbaa !12
  %30 = invoke noundef signext i8 @_Z17MyCharLower_Asciic(i8 noundef signext %29)
          to label %31 unwind label %42

31:                                               ; preds = %27
  %32 = sext i8 %30 to i32
  %33 = icmp ne i32 %28, %32
  br i1 %33, label %34, label %35

34:                                               ; preds = %31
  store i1 false, ptr %3, align 1
  store i32 1, ptr %8, align 4
  br label %36

35:                                               ; preds = %31
  store i32 0, ptr %8, align 4
  br label %36

36:                                               ; preds = %35, %34
  call void @llvm.lifetime.end.p0(i64 1, ptr %9) #4
  br label %37

37:                                               ; preds = %36, %20
  call void @llvm.lifetime.end.p0(i64 1, ptr %7) #4
  %38 = load i32, ptr %8, align 4
  switch i32 %38, label %40 [
    i32 0, label %39
  ]

39:                                               ; preds = %37
  br label %13, !llvm.loop !13

40:                                               ; preds = %37
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #4
  %41 = load i1, ptr %3, align 1
  ret i1 %41

42:                                               ; preds = %27, %21
  %43 = landingpad { ptr, i32 }
          catch ptr null
  %44 = extractvalue { ptr, i32 } %43, 0
  call void @__clang_call_terminate(ptr %44) #5
  unreachable
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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" }
attributes #2 = { 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 #3 = { 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 #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 = !{!10, !6, i64 0}
!10 = !{!"_ZTS7AString", !6, i64 0, !11, i64 8, !11, i64 12}
!11 = !{!"int", !7, i64 0}
!12 = !{!7, !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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: inlinehint mustprogress nounwind uwtable
declare dso_local noundef signext i8 @_Z17MyCharLower_Asciic(i8 noundef signext) local_unnamed_addr #0

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_ZNK7AString25IsPrefixedBy_Ascii_NoCaseEPKc(ptr nocapture noundef nonnull readonly align 8 dereferenceable(16) %0, ptr nocapture noundef readonly %1) local_unnamed_addr #1 align 2 personality ptr @__gxx_personality_v0 {
  %3 = load ptr, ptr %0, align 8, !tbaa !5
  br label %4

4:                                                ; preds = %7, %2
  %.010 = phi ptr [ %3, %2 ], [ %9, %7 ]
  %.09 = phi ptr [ %1, %2 ], [ %8, %7 ]
  %5 = load i8, ptr %.09, align 1, !tbaa !11
  %6 = icmp eq i8 %5, 0
  br i1 %6, label %13, label %7

7:                                                ; preds = %4
  %8 = getelementptr inbounds i8, ptr %.09, i64 1
  %9 = getelementptr inbounds i8, ptr %.010, i64 1
  %10 = load i8, ptr %.010, align 1, !tbaa !11
  %11 = tail call noundef signext i8 @_Z17MyCharLower_Asciic(i8 noundef signext %10)
  %12 = tail call noundef signext i8 @_Z17MyCharLower_Asciic(i8 noundef signext %5)
  %.not = icmp eq i8 %11, %12
  br i1 %.not, label %4, label %13, !llvm.loop !12

13:                                               ; preds = %7, %4
  ret i1 %6
}

attributes #0 = { 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 #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" }

!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, !7, i64 0}
!6 = !{!"_ZTS7AString", !7, i64 0, !10, i64 8, !10, i64 12}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!8, !8, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass