; LLVM IR from gem5/gem5 :: ext/libfdt (fdt_ro)

; 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

declare i32 @fdt_check_header(ptr noundef) #1

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

declare i32 @fdt_next_node(ptr noundef, i32 noundef, ptr noundef) #1

; Function Attrs: nounwind uwtable
declare dso_local i32 @fdt_get_phandle(ptr noundef, i32 noundef) #2

; Function Attrs: nounwind uwtable
define dso_local i32 @fdt_node_offset_by_phandle(ptr noundef %0, i32 noundef %1) #2 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  %9 = load i32, ptr %5, align 4, !tbaa !9
  %10 = icmp eq i32 %9, 0
  br i1 %10, label %14, label %11

11:                                               ; preds = %2
  %12 = load i32, ptr %5, align 4, !tbaa !9
  %13 = icmp eq i32 %12, -1
  br i1 %13, label %14, label %15

14:                                               ; preds = %11, %2
  store i32 -6, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %45

15:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  %17 = call i32 @fdt_check_header(ptr noundef %16)
  store i32 %17, ptr %8, align 4, !tbaa !9
  %18 = icmp ne i32 %17, 0
  br i1 %18, label %19, label %21

19:                                               ; preds = %15
  %20 = load i32, ptr %8, align 4, !tbaa !9
  store i32 %20, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %22

21:                                               ; preds = %15
  store i32 0, ptr %7, align 4
  br label %22

22:                                               ; preds = %21, %19
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  %23 = load i32, ptr %7, align 4
  switch i32 %23, label %45 [
    i32 0, label %24
  ]

24:                                               ; preds = %22
  %25 = load ptr, ptr %4, align 8, !tbaa !5
  %26 = call i32 @fdt_next_node(ptr noundef %25, i32 noundef -1, ptr noundef null)
  store i32 %26, ptr %6, align 4, !tbaa !9
  br label %27

27:                                               ; preds = %39, %24
  %28 = load i32, ptr %6, align 4, !tbaa !9
  %29 = icmp sge i32 %28, 0
  br i1 %29, label %30, label %43

30:                                               ; preds = %27
  %31 = load ptr, ptr %4, align 8, !tbaa !5
  %32 = load i32, ptr %6, align 4, !tbaa !9
  %33 = call i32 @fdt_get_phandle(ptr noundef %31, i32 noundef %32)
  %34 = load i32, ptr %5, align 4, !tbaa !9
  %35 = icmp eq i32 %33, %34
  br i1 %35, label %36, label %38

36:                                               ; preds = %30
  %37 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %37, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %45

38:                                               ; preds = %30
  br label %39

39:                                               ; preds = %38
  %40 = load ptr, ptr %4, align 8, !tbaa !5
  %41 = load i32, ptr %6, align 4, !tbaa !9
  %42 = call i32 @fdt_next_node(ptr noundef %40, i32 noundef %41, ptr noundef null)
  store i32 %42, ptr %6, align 4, !tbaa !9
  br label %27, !llvm.loop !11

43:                                               ; preds = %27
  %44 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %44, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %45

45:                                               ; preds = %43, %36, %22, %14
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  %46 = load i32, ptr %3, align 4
  ret i32 %46
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { "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 = { 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 = { 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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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"

declare i32 @fdt_check_header(ptr noundef) local_unnamed_addr #0

declare i32 @fdt_next_node(ptr noundef, i32 noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local i32 @fdt_get_phandle(ptr noundef, i32 noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local i32 @fdt_node_offset_by_phandle(ptr noundef %0, i32 noundef %1) local_unnamed_addr #1 {
  %3 = add i32 %1, 1
  %or.cond = icmp ult i32 %3, 2
  br i1 %or.cond, label %.loopexit, label %4

4:                                                ; preds = %2
  %5 = tail call i32 @fdt_check_header(ptr noundef %0) #2
  %.not = icmp eq i32 %5, 0
  br i1 %.not, label %6, label %.loopexit

6:                                                ; preds = %4
  %7 = tail call i32 @fdt_next_node(ptr noundef %0, i32 noundef -1, ptr noundef null) #2
  %8 = icmp sgt i32 %7, -1
  br i1 %8, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %6, %11
  %.01617 = phi i32 [ %12, %11 ], [ %7, %6 ]
  %9 = tail call i32 @fdt_get_phandle(ptr noundef %0, i32 noundef %.01617)
  %10 = icmp eq i32 %9, %1
  br i1 %10, label %.loopexit, label %11

11:                                               ; preds = %.lr.ph
  %12 = tail call i32 @fdt_next_node(ptr noundef %0, i32 noundef %.01617, ptr noundef null) #2
  %13 = icmp sgt i32 %12, -1
  br i1 %13, label %.lr.ph, label %.loopexit, !llvm.loop !5

.loopexit:                                        ; preds = %.lr.ph, %11, %6, %2, %4
  %.1 = phi i32 [ %5, %4 ], [ -6, %2 ], [ %7, %6 ], [ %.01617, %.lr.ph ], [ %12, %11 ]
  ret i32 %.1
}

attributes #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 = { 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 = { 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


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