; LLVM IR from pandax381/microps :: ip (ip_protocol_name)

; 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"

%struct.ip_protocol = type { ptr, [16 x i8], i8, ptr }

@protocols = external hidden global ptr, align 8
@.str.25 = external hidden unnamed_addr constant [8 x i8], align 1

; 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: nounwind uwtable
define dso_local ptr @ip_protocol_name(i8 noundef zeroext %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca i8, align 1
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store i8 %0, ptr %3, align 1, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %6 = load ptr, ptr @protocols, align 8, !tbaa !8
  store ptr %6, ptr %4, align 8, !tbaa !8
  br label %7

7:                                                ; preds = %23, %1
  %8 = load ptr, ptr %4, align 8, !tbaa !8
  %9 = icmp ne ptr %8, null
  br i1 %9, label %10, label %27

10:                                               ; preds = %7
  %11 = load ptr, ptr %4, align 8, !tbaa !8
  %12 = getelementptr inbounds %struct.ip_protocol, ptr %11, i32 0, i32 2
  %13 = load i8, ptr %12, align 8, !tbaa !10
  %14 = zext i8 %13 to i32
  %15 = load i8, ptr %3, align 1, !tbaa !5
  %16 = zext i8 %15 to i32
  %17 = icmp eq i32 %14, %16
  br i1 %17, label %18, label %22

18:                                               ; preds = %10
  %19 = load ptr, ptr %4, align 8, !tbaa !8
  %20 = getelementptr inbounds %struct.ip_protocol, ptr %19, i32 0, i32 1
  %21 = getelementptr inbounds [16 x i8], ptr %20, i64 0, i64 0
  store ptr %21, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %28

22:                                               ; preds = %10
  br label %23

23:                                               ; preds = %22
  %24 = load ptr, ptr %4, align 8, !tbaa !8
  %25 = getelementptr inbounds %struct.ip_protocol, ptr %24, i32 0, i32 0
  %26 = load ptr, ptr %25, align 8, !tbaa !12
  store ptr %26, ptr %4, align 8, !tbaa !8
  br label %7, !llvm.loop !13

27:                                               ; preds = %7
  store ptr @.str.25, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %28

28:                                               ; preds = %27, %18
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  %29 = load ptr, ptr %2, align 8
  ret ptr %29
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = !{!6, !6, i64 0}
!6 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"any pointer", !6, i64 0}
!10 = !{!11, !6, i64 24}
!11 = !{!"ip_protocol", !9, i64 0, !6, i64 8, !6, i64 24, !9, i64 32}
!12 = !{!11, !9, 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"

@protocols = external hidden local_unnamed_addr global ptr, align 8
@.str.25 = external hidden unnamed_addr constant [8 x i8], align 1

; Function Attrs: nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local nonnull ptr @ip_protocol_name(i8 noundef zeroext %0) local_unnamed_addr #0 {
  br label %2

2:                                                ; preds = %3, %1
  %.0.in = phi ptr [ @protocols, %1 ], [ %.0, %3 ]
  %.0 = load ptr, ptr %.0.in, align 8, !tbaa !5
  %.not = icmp eq ptr %.0, null
  br i1 %.not, label %.loopexit, label %3

3:                                                ; preds = %2
  %4 = getelementptr inbounds i8, ptr %.0, i64 24
  %5 = load i8, ptr %4, align 8, !tbaa !9
  %6 = icmp eq i8 %5, %0
  br i1 %6, label %7, label %2, !llvm.loop !11

7:                                                ; preds = %3
  %8 = getelementptr inbounds i8, ptr %.0, i64 8
  br label %.loopexit

.loopexit:                                        ; preds = %2, %7
  %.05 = phi ptr [ %8, %7 ], [ @.str.25, %2 ]
  ret ptr %.05
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !7, i64 24}
!10 = !{!"ip_protocol", !6, i64 0, !7, i64 8, !7, i64 24, !6, i64 32}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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