; LLVM IR from Leet-Us-Code/DSA-A-Z-Practice :: Sid's Levels/Level - 1/Tries (Intro)

; 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: mustprogress nounwind uwtable
declare noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32)) #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef) #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef zeroext i1 @_Z6searchP8trieNodeNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE(ptr noundef %0, ptr noundef %1) #2 {
  %3 = alloca i1, align 1
  %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
  %9 = 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 8, ptr %6) #3
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %10, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %42, %2
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = sext i32 %12 to i64
  %14 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #3
  %15 = icmp ult i64 %13, %14
  br i1 %15, label %17, label %16

16:                                               ; preds = %11
  store i32 2, ptr %8, align 4
  br label %45

17:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  %18 = load i32, ptr %7, align 4, !tbaa !9
  %19 = sext i32 %18 to i64
  %20 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef %19)
  %21 = load i8, ptr %20, align 1, !tbaa !11
  %22 = sext i8 %21 to i32
  %23 = sub nsw i32 %22, 97
  store i32 %23, ptr %9, align 4, !tbaa !9
  %24 = load ptr, ptr %6, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.trieNode, ptr %24, i32 0, i32 0
  %26 = load i32, ptr %7, align 4, !tbaa !9
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds [26 x ptr], ptr %25, i64 0, i64 %27
  %29 = load ptr, ptr %28, align 8, !tbaa !5
  %30 = icmp ne ptr %29, null
  br i1 %30, label %32, label %31

31:                                               ; preds = %17
  store i1 false, ptr %3, align 1
  store i32 1, ptr %8, align 4
  br label %39

32:                                               ; preds = %17
  %33 = load ptr, ptr %6, align 8, !tbaa !5
  %34 = getelementptr inbounds %struct.trieNode, ptr %33, i32 0, i32 0
  %35 = load i32, ptr %9, align 4, !tbaa !9
  %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
  store ptr %38, ptr %6, align 8, !tbaa !5
  store i32 0, ptr %8, align 4
  br label %39

39:                                               ; preds = %32, %31
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  %40 = load i32, ptr %8, align 4
  switch i32 %40, label %45 [
    i32 0, label %41
  ]

41:                                               ; preds = %39
  br label %42

42:                                               ; preds = %41
  %43 = load i32, ptr %7, align 4, !tbaa !9
  %44 = add nsw i32 %43, 1
  store i32 %44, ptr %7, align 4, !tbaa !9
  br label %11, !llvm.loop !12

45:                                               ; preds = %39, %16
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  %46 = load i32, ptr %8, align 4
  switch i32 %46, label %59 [
    i32 2, label %47
  ]

47:                                               ; preds = %45
  %48 = load ptr, ptr %6, align 8, !tbaa !5
  %49 = icmp ne ptr %48, null
  br i1 %49, label %50, label %58

50:                                               ; preds = %47
  %51 = load ptr, ptr %6, align 8, !tbaa !5
  %52 = getelementptr inbounds %struct.trieNode, ptr %51, i32 0, i32 1
  %53 = load i8, ptr %52, align 8, !tbaa !14, !range !17, !noundef !18
  %54 = trunc i8 %53 to i1
  %55 = zext i1 %54 to i32
  %56 = icmp ne i32 %55, 0
  br i1 %56, label %57, label %58

57:                                               ; preds = %50
  store i1 true, ptr %3, align 1
  store i32 1, ptr %8, align 4
  br label %59

58:                                               ; preds = %50, %47
  store i1 false, ptr %3, align 1
  store i32 1, ptr %8, align 4
  br label %59

59:                                               ; preds = %58, %57, %45
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  %60 = load i1, ptr %3, align 1
  ret i1 %60
}

attributes #0 = { 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 = { 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 #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 = !{!"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 nounwind uwtable
declare noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z6searchP8trieNodeNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE(ptr noundef readonly %0, ptr noundef nonnull %1) local_unnamed_addr #0 {
  %3 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #1
  %.not24.not = icmp eq i64 %3, 0
  br i1 %.not24.not, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %7
  %indvars.iv = phi i64 [ %indvars.iv.next, %7 ], [ 0, %2 ]
  %.01625 = phi ptr [ %12, %7 ], [ %0, %2 ]
  %4 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef %indvars.iv)
  %5 = getelementptr inbounds [26 x ptr], ptr %.01625, i64 0, i64 %indvars.iv
  %6 = load ptr, ptr %5, align 8, !tbaa !5
  %.not.not = icmp eq ptr %6, null
  br i1 %.not.not, label %.thread22, label %7

7:                                                ; preds = %.lr.ph
  %8 = load i8, ptr %4, align 1, !tbaa !9
  %9 = sext i8 %8 to i64
  %10 = add nsw i64 %9, -97
  %11 = getelementptr inbounds [26 x ptr], ptr %.01625, i64 0, i64 %10
  %12 = load ptr, ptr %11, align 8, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %13 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #1
  %.not = icmp ugt i64 %13, %indvars.iv.next
  br i1 %.not, label %.lr.ph, label %._crit_edge, !llvm.loop !10

._crit_edge:                                      ; preds = %7, %2
  %.016.lcssa = phi ptr [ %0, %2 ], [ %12, %7 ]
  %.not20 = icmp eq ptr %.016.lcssa, null
  br i1 %.not20, label %18, label %14

14:                                               ; preds = %._crit_edge
  %15 = getelementptr inbounds i8, ptr %.016.lcssa, i64 208
  %16 = load i8, ptr %15, align 8, !tbaa !12, !range !15, !noundef !16
  %17 = trunc nuw i8 %16 to i1
  br i1 %17, label %.thread22, label %18

18:                                               ; preds = %14, %._crit_edge
  br label %.thread22

.thread22:                                        ; preds = %.lr.ph, %14, %18
  %.3 = phi i1 [ false, %18 ], [ true, %14 ], [ false, %.lr.ph ]
  ret i1 %.3
}

attributes #0 = { 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 #1 = { 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 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}
!12 = !{!13, !14, i64 208}
!13 = !{!"_ZTS8trieNode", !7, i64 0, !14, i64 208}
!14 = !{!"bool", !7, i64 0}
!15 = !{i8 0, i8 2}
!16 = !{}


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