; LLVM IR from xuxping/codelife :: algorthms/tree (trie)

; 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.TrieNode = type { i32, i32, [26 x 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: nounwind uwtable
define dso_local i32 @search(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = icmp eq ptr %9, null
  br i1 %10, label %19, label %11

11:                                               ; preds = %2
  %12 = load ptr, ptr %5, align 8, !tbaa !5
  %13 = icmp eq ptr %12, null
  br i1 %13, label %19, label %14

14:                                               ; preds = %11
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  %16 = load i8, ptr %15, align 1, !tbaa !9
  %17 = sext i8 %16 to i32
  %18 = icmp eq i32 %17, 0
  br i1 %18, label %19, label %20

19:                                               ; preds = %14, %11, %2
  store i32 0, ptr %3, align 4
  br label %56

20:                                               ; preds = %14
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %21 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %21, ptr %6, align 8, !tbaa !5
  br label %22

22:                                               ; preds = %50, %20
  %23 = load ptr, ptr %5, align 8, !tbaa !5
  %24 = load i8, ptr %23, align 1, !tbaa !9
  %25 = sext i8 %24 to i32
  %26 = icmp ne i32 %25, 0
  br i1 %26, label %27, label %51

27:                                               ; preds = %22
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %28 = load ptr, ptr %5, align 8, !tbaa !5
  %29 = getelementptr inbounds i8, ptr %28, i32 1
  store ptr %29, ptr %5, align 8, !tbaa !5
  %30 = load i8, ptr %28, align 1, !tbaa !9
  %31 = sext i8 %30 to i32
  %32 = sub nsw i32 %31, 97
  store i32 %32, ptr %7, align 4, !tbaa !10
  %33 = load ptr, ptr %6, align 8, !tbaa !5
  %34 = getelementptr inbounds %struct.TrieNode, ptr %33, i32 0, i32 2
  %35 = load i32, ptr %7, align 4, !tbaa !10
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds [26 x ptr], ptr %34, i64 0, i64 %36
  %38 = load ptr, ptr %37, align 8, !tbaa !5
  %39 = icmp eq ptr %38, null
  br i1 %39, label %40, label %41

40:                                               ; preds = %27
  store i32 0, ptr %3, align 4
  store i32 1, ptr %8, align 4
  br label %48

41:                                               ; preds = %27
  %42 = load ptr, ptr %6, align 8, !tbaa !5
  %43 = getelementptr inbounds %struct.TrieNode, ptr %42, i32 0, i32 2
  %44 = load i32, ptr %7, align 4, !tbaa !10
  %45 = sext i32 %44 to i64
  %46 = getelementptr inbounds [26 x ptr], ptr %43, i64 0, i64 %45
  %47 = load ptr, ptr %46, align 8, !tbaa !5
  store ptr %47, ptr %6, align 8, !tbaa !5
  store i32 0, ptr %8, align 4
  br label %48

48:                                               ; preds = %41, %40
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  %49 = load i32, ptr %8, align 4
  switch i32 %49, label %55 [
    i32 0, label %50
  ]

50:                                               ; preds = %48
  br label %22, !llvm.loop !12

51:                                               ; preds = %22
  %52 = load ptr, ptr %6, align 8, !tbaa !5
  %53 = getelementptr inbounds %struct.TrieNode, ptr %52, i32 0, i32 0
  %54 = load i32, ptr %53, align 8, !tbaa !14
  store i32 %54, ptr %3, align 4
  store i32 1, ptr %8, align 4
  br label %55

55:                                               ; preds = %51, %48
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %56

56:                                               ; preds = %55, %19
  %57 = load i32, ptr %3, align 4
  ret i32 %57
}

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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!7, !7, i64 0}
!10 = !{!11, !11, i64 0}
!11 = !{!"int", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = !{!15, !11, i64 0}
!15 = !{!"TrieNode", !11, i64 0, !11, i64 4, !7, i64 8}


; 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: nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local i32 @search(ptr noundef readonly %0, ptr noundef readonly %1) local_unnamed_addr #0 {
  %3 = icmp eq ptr %0, null
  %4 = icmp eq ptr %1, null
  %or.cond = or i1 %3, %4
  br i1 %or.cond, label %.loopexit, label %5

5:                                                ; preds = %2
  %6 = load i8, ptr %1, align 1, !tbaa !5
  %7 = icmp eq i8 %6, 0
  br i1 %7, label %.loopexit, label %.preheader

thread-pre-split:                                 ; preds = %.preheader
  %8 = getelementptr inbounds i8, ptr %.01623, i64 1
  %.pr = load i8, ptr %8, align 1, !tbaa !5
  %.not = icmp eq i8 %.pr, 0
  br i1 %.not, label %15, label %.preheader

.preheader:                                       ; preds = %5, %thread-pre-split
  %.01424 = phi ptr [ %14, %thread-pre-split ], [ %0, %5 ]
  %.01623 = phi ptr [ %8, %thread-pre-split ], [ %1, %5 ]
  %9 = phi i8 [ %.pr, %thread-pre-split ], [ %6, %5 ]
  %10 = sext i8 %9 to i64
  %11 = add nsw i64 %10, -97
  %12 = getelementptr inbounds i8, ptr %.01424, i64 8
  %13 = getelementptr inbounds [26 x ptr], ptr %12, i64 0, i64 %11
  %14 = load ptr, ptr %13, align 8, !tbaa !8
  %.not21 = icmp eq ptr %14, null
  br i1 %.not21, label %.loopexit, label %thread-pre-split, !llvm.loop !10

15:                                               ; preds = %thread-pre-split
  %16 = load i32, ptr %14, align 8, !tbaa !12
  br label %.loopexit

.loopexit:                                        ; preds = %.preheader, %15, %2, %5
  %.3 = phi i32 [ 0, %5 ], [ 0, %2 ], [ %16, %15 ], [ 0, %.preheader ]
  ret i32 %.3
}

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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"any pointer", !6, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}
!12 = !{!13, !14, i64 0}
!13 = !{!"TrieNode", !14, i64 0, !14, i64 4, !6, i64 8}
!14 = !{!"int", !6, i64 0}


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