; LLVM IR from sbshah97/DS-Algo-Handbook :: Data-Structures/Tries/Trie.ll (Z6searchP8TrieNodePKc)

; 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 { [26 x ptr], i8 }

; 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 willreturn memory(read)
declare i64 @strlen(ptr noundef) #1

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z6searchP8TrieNodePKc(ptr noundef %0, ptr noundef %1) #2 {
  %3 = alloca i1, align 1
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca ptr, align 8
  %10 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = call i64 @strlen(ptr noundef %11) #4
  %13 = trunc i64 %12 to i32
  store i32 %13, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #3
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %14, ptr %9, align 8, !tbaa !5
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %15

15:                                               ; preds = %42, %2
  %16 = load i32, ptr %6, align 4, !tbaa !9
  %17 = load i32, ptr %7, align 4, !tbaa !9
  %18 = icmp slt i32 %16, %17
  br i1 %18, label %19, label %45

19:                                               ; preds = %15
  %20 = load ptr, ptr %5, align 8, !tbaa !5
  %21 = load i32, ptr %6, align 4, !tbaa !9
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds i8, ptr %20, i64 %22
  %24 = load i8, ptr %23, align 1, !tbaa !11
  %25 = sext i8 %24 to i32
  %26 = sub nsw i32 %25, 97
  store i32 %26, ptr %8, align 4, !tbaa !9
  %27 = load ptr, ptr %9, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.TrieNode, ptr %27, i32 0, i32 0
  %29 = load i32, ptr %8, align 4, !tbaa !9
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds [26 x ptr], ptr %28, i64 0, i64 %30
  %32 = load ptr, ptr %31, align 8, !tbaa !5
  %33 = icmp ne ptr %32, null
  br i1 %33, label %35, label %34

34:                                               ; preds = %19
  store i1 false, ptr %3, align 1
  store i32 1, ptr %10, align 4
  br label %55

35:                                               ; preds = %19
  %36 = load ptr, ptr %9, align 8, !tbaa !5
  %37 = getelementptr inbounds %struct.TrieNode, ptr %36, i32 0, i32 0
  %38 = load i32, ptr %8, align 4, !tbaa !9
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds [26 x ptr], ptr %37, i64 0, i64 %39
  %41 = load ptr, ptr %40, align 8, !tbaa !5
  store ptr %41, ptr %9, align 8, !tbaa !5
  br label %42

42:                                               ; preds = %35
  %43 = load i32, ptr %6, align 4, !tbaa !9
  %44 = add nsw i32 %43, 1
  store i32 %44, ptr %6, align 4, !tbaa !9
  br label %15, !llvm.loop !12

45:                                               ; preds = %15
  %46 = load ptr, ptr %9, align 8, !tbaa !5
  %47 = icmp ne ptr %46, null
  br i1 %47, label %48, label %53

48:                                               ; preds = %45
  %49 = load ptr, ptr %9, align 8, !tbaa !5
  %50 = getelementptr inbounds %struct.TrieNode, ptr %49, i32 0, i32 1
  %51 = load i8, ptr %50, align 8, !tbaa !14, !range !17, !noundef !18
  %52 = trunc i8 %51 to i1
  br label %53

53:                                               ; preds = %48, %45
  %54 = phi i1 [ false, %45 ], [ %52, %48 ]
  store i1 %54, ptr %3, align 1
  store i32 1, ptr %10, align 4
  br label %55

55:                                               ; preds = %53, %34
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  %56 = load i1, ptr %3, align 1
  ret i1 %56
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { 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 }
attributes #4 = { 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 = !{!"int", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = !{!15, !16, i64 208}
!15 = !{!"_ZTS8TrieNode", !7, i64 0, !16, i64 208}
!16 = !{!"bool", !7, i64 0}
!17 = !{i8 0, i8 2}
!18 = !{}


; 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 nofree nounwind willreturn memory(argmem: read)
declare i64 @strlen(ptr nocapture noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nofree nounwind willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local noundef zeroext i1 @_Z6searchP8TrieNodePKc(ptr noundef readonly %0, ptr nocapture noundef readonly %1) local_unnamed_addr #1 {
  %3 = tail call i64 @strlen(ptr noundef nonnull dereferenceable(1) %1) #2
  %4 = trunc i64 %3 to i32
  %5 = icmp sgt i32 %4, 0
  br i1 %5, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %wide.trip.count = and i64 %3, 2147483647
  br label %.lr.ph

6:                                                ; preds = %.lr.ph
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge.thread, label %.lr.ph, !llvm.loop !5

.lr.ph:                                           ; preds = %.lr.ph.preheader, %6
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %6 ]
  %.019 = phi ptr [ %0, %.lr.ph.preheader ], [ %12, %6 ]
  %7 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv
  %8 = load i8, ptr %7, align 1, !tbaa !7
  %9 = sext i8 %8 to i64
  %10 = add nsw i64 %9, -97
  %11 = getelementptr inbounds [26 x ptr], ptr %.019, i64 0, i64 %10
  %12 = load ptr, ptr %11, align 8, !tbaa !10
  %.not16 = icmp eq ptr %12, null
  br i1 %.not16, label %.loopexit, label %6

._crit_edge:                                      ; preds = %2
  %.not = icmp eq ptr %0, null
  br i1 %.not, label %.loopexit, label %._crit_edge.thread

._crit_edge.thread:                               ; preds = %6, %._crit_edge
  %.0.lcssa24 = phi ptr [ %0, %._crit_edge ], [ %12, %6 ]
  %13 = getelementptr inbounds i8, ptr %.0.lcssa24, i64 208
  %14 = load i8, ptr %13, align 8, !tbaa !12, !range !15, !noundef !16
  %15 = trunc nuw i8 %14 to i1
  br label %.loopexit

.loopexit:                                        ; preds = %.lr.ph, %._crit_edge, %._crit_edge.thread
  %.013 = phi i1 [ false, %._crit_edge ], [ %15, %._crit_edge.thread ], [ false, %.lr.ph ]
  ret i1 %.013
}

attributes #0 = { 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 #1 = { mustprogress nofree nounwind willreturn 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" }
attributes #2 = { 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}
!7 = !{!8, !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!11, !11, i64 0}
!11 = !{!"any pointer", !8, i64 0}
!12 = !{!13, !14, i64 208}
!13 = !{!"_ZTS8TrieNode", !8, i64 0, !14, i64 208}
!14 = !{!"bool", !8, i64 0}
!15 = !{i8 0, i8 2}
!16 = !{}


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