; LLVM IR from facebook/redex :: libresource/String8.ll (ZNK7android7String84findEPKcm)

; 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.android::String8" = type { ptr }

; 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 uwtable
declare dso_local noundef i64 @_ZNK7android7String84sizeEv(ptr noundef nonnull align 8 dereferenceable(8)) #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef i64 @_ZNK7android7String84findEPKcm(ptr noundef nonnull align 8 dereferenceable(8) %0, ptr noundef %1, i64 noundef %2) #2 align 2 {
  %4 = alloca i64, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i64, align 8
  %8 = alloca i64, align 8
  %9 = alloca i32, align 4
  %10 = alloca ptr, align 8
  %11 = alloca ptr, align 8
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i64 %2, ptr %7, align 8, !tbaa !9
  %12 = load ptr, ptr %5, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  %13 = call noundef i64 @_ZNK7android7String84sizeEv(ptr noundef nonnull align 8 dereferenceable(8) %12)
  store i64 %13, ptr %8, align 8, !tbaa !9
  %14 = load i64, ptr %7, align 8, !tbaa !9
  %15 = load i64, ptr %8, align 8, !tbaa !9
  %16 = icmp uge i64 %14, %15
  br i1 %16, label %17, label %18

17:                                               ; preds = %3
  store i64 -1, ptr %4, align 8
  store i32 1, ptr %9, align 4
  br label %38

18:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #4
  %19 = getelementptr inbounds %"class.android::String8", ptr %12, i32 0, i32 0
  %20 = load ptr, ptr %19, align 8, !tbaa !11
  %21 = load i64, ptr %7, align 8, !tbaa !9
  %22 = getelementptr inbounds i8, ptr %20, i64 %21
  store ptr %22, ptr %10, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %11) #4
  %23 = load ptr, ptr %10, align 8, !tbaa !5
  %24 = load ptr, ptr %6, align 8, !tbaa !5
  %25 = call noundef ptr @strstr(ptr noundef %23, ptr noundef %24) #5
  store ptr %25, ptr %11, align 8, !tbaa !5
  %26 = load ptr, ptr %11, align 8, !tbaa !5
  %27 = icmp ne ptr %26, null
  br i1 %27, label %28, label %35

28:                                               ; preds = %18
  %29 = load ptr, ptr %11, align 8, !tbaa !5
  %30 = getelementptr inbounds %"class.android::String8", ptr %12, i32 0, i32 0
  %31 = load ptr, ptr %30, align 8, !tbaa !11
  %32 = ptrtoint ptr %29 to i64
  %33 = ptrtoint ptr %31 to i64
  %34 = sub i64 %32, %33
  br label %36

35:                                               ; preds = %18
  br label %36

36:                                               ; preds = %35, %28
  %37 = phi i64 [ %34, %28 ], [ -1, %35 ]
  store i64 %37, ptr %4, align 8
  store i32 1, ptr %9, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %11) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #4
  br label %38

38:                                               ; preds = %36, %17
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  %39 = load i64, ptr %4, align 8
  ret i64 %39
}

; Function Attrs: nounwind willreturn memory(read)
declare noundef ptr @strstr(ptr noundef, ptr noundef) #3

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { inlinehint mustprogress 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 = { mustprogress 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 = { nounwind willreturn memory(read) "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 = { nounwind willreturn memory(read) }

!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, !10, i64 0}
!10 = !{!"long", !7, i64 0}
!11 = !{!12, !6, i64 0}
!12 = !{!"_ZTSN7android7String8E", !6, i64 0}


; 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 uwtable
declare dso_local noundef i64 @_ZNK7android7String84sizeEv(ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef i64 @_ZNK7android7String84findEPKcm(ptr noundef nonnull align 8 dereferenceable(8) %0, ptr nocapture noundef readonly %1, i64 noundef %2) local_unnamed_addr #1 align 2 {
  %4 = tail call noundef i64 @_ZNK7android7String84sizeEv(ptr noundef nonnull align 8 dereferenceable(8) %0)
  %.not = icmp ugt i64 %4, %2
  br i1 %.not, label %5, label %13

5:                                                ; preds = %3
  %6 = load ptr, ptr %0, align 8, !tbaa !5
  %7 = getelementptr inbounds i8, ptr %6, i64 %2
  %8 = tail call noundef ptr @strstr(ptr noundef nonnull dereferenceable(1) %7, ptr noundef nonnull dereferenceable(1) %1) #3
  %.not10 = icmp eq ptr %8, null
  %9 = ptrtoint ptr %8 to i64
  %10 = ptrtoint ptr %6 to i64
  %11 = sub i64 %9, %10
  %12 = select i1 %.not10, i64 -1, i64 %11
  br label %13

13:                                               ; preds = %3, %5
  %.0 = phi i64 [ %12, %5 ], [ -1, %3 ]
  ret i64 %.0
}

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: read)
declare noundef ptr @strstr(ptr noundef, ptr nocapture noundef) local_unnamed_addr #2

attributes #0 = { inlinehint mustprogress 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 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 = { mustprogress nofree nounwind willreturn memory(argmem: read) "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 = { nounwind willreturn memory(read) }

!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 = !{!"_ZTSN7android7String8E", !7, i64 0}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass