; LLVM IR from p4lang/p4c :: lib/nethash.ll (ZN2P47NetHash8identityEPKhm)

; 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 uwtable
define dso_local noundef i64 @_ZN2P47NetHash8identityEPKhm(ptr noundef %0, i64 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  store i64 0, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  store i64 0, ptr %6, align 8, !tbaa !9
  br label %8

8:                                                ; preds = %28, %2
  %9 = load i64, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  store i64 8, ptr %7, align 8, !tbaa !9
  %10 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3minImERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %7, ptr noundef nonnull align 8 dereferenceable(8) %4)
  %11 = load i64, ptr %10, align 8, !tbaa !9
  %12 = icmp ult i64 %9, %11
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  br i1 %12, label %14, label %13

13:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  br label %31

14:                                               ; preds = %8
  %15 = load i64, ptr %6, align 8, !tbaa !9
  %16 = icmp ugt i64 %15, 0
  br i1 %16, label %17, label %20

17:                                               ; preds = %14
  %18 = load i64, ptr %5, align 8, !tbaa !9
  %19 = shl i64 %18, 8
  store i64 %19, ptr %5, align 8, !tbaa !9
  br label %20

20:                                               ; preds = %17, %14
  %21 = load ptr, ptr %3, align 8, !tbaa !5
  %22 = load i64, ptr %6, align 8, !tbaa !9
  %23 = getelementptr inbounds i8, ptr %21, i64 %22
  %24 = load i8, ptr %23, align 1, !tbaa !11
  %25 = zext i8 %24 to i64
  %26 = load i64, ptr %5, align 8, !tbaa !9
  %27 = add i64 %26, %25
  store i64 %27, ptr %5, align 8, !tbaa !9
  br label %28

28:                                               ; preds = %20
  %29 = load i64, ptr %6, align 8, !tbaa !9
  %30 = add i64 %29, 1
  store i64 %30, ptr %6, align 8, !tbaa !9
  br label %8, !llvm.loop !12

31:                                               ; preds = %13
  %32 = load i64, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  ret i64 %32
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3minImERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { 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 = { 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, !10, i64 0}
!10 = !{!"long", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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 nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress 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 noundef i64 @_ZN2P47NetHash8identityEPKhm(ptr nocapture noundef readonly %0, i64 noundef %1) local_unnamed_addr #1 {
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  store i64 %1, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %4) #3
  store i64 8, ptr %4, align 8, !tbaa !5
  %5 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3minImERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %4, ptr noundef nonnull align 8 dereferenceable(8) %3)
  %6 = load i64, ptr %5, align 8, !tbaa !5
  %.not10 = icmp eq i64 %6, 0
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %4) #3
  br i1 %.not10, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %2
  %7 = load i8, ptr %0, align 1, !tbaa !9
  %8 = zext i8 %7 to i64
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %4) #3
  store i64 8, ptr %4, align 8, !tbaa !5
  %9 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3minImERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %4, ptr noundef nonnull align 8 dereferenceable(8) %3)
  %10 = load i64, ptr %9, align 8, !tbaa !5
  %11 = icmp ugt i64 %10, 1
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %4) #3
  br i1 %11, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph, %.lr.ph.preheader, %2
  %.07.lcssa = phi i64 [ 0, %2 ], [ %8, %.lr.ph.preheader ], [ %16, %.lr.ph ]
  ret i64 %.07.lcssa

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %.09 = phi i64 [ %17, %.lr.ph ], [ 1, %.lr.ph.preheader ]
  %.078 = phi i64 [ %16, %.lr.ph ], [ %8, %.lr.ph.preheader ]
  %12 = shl i64 %.078, 8
  %13 = getelementptr inbounds i8, ptr %0, i64 %.09
  %14 = load i8, ptr %13, align 1, !tbaa !9
  %15 = zext i8 %14 to i64
  %16 = or disjoint i64 %12, %15
  %17 = add nuw i64 %.09, 1
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %4) #3
  store i64 8, ptr %4, align 8, !tbaa !5
  %18 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3minImERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %4, ptr noundef nonnull align 8 dereferenceable(8) %3)
  %19 = load i64, ptr %18, align 8, !tbaa !5
  %20 = icmp ult i64 %17, %19
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %4) #3
  br i1 %20, label %.lr.ph, label %._crit_edge, !llvm.loop !10
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3minImERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #2

attributes #0 = { mustprogress 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 = { 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 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11, !12}
!11 = !{!"llvm.loop.mustprogress"}
!12 = !{!"llvm.loop.peeled.count", i32 1}


; Effective O3 passes: CorrelatedValuePropagationPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopFullUnrollPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SCCPPass,SROAPass,SimplifyCFGPass