; LLVM IR from ahampriyanshu/algo-ds-101 :: Algorithms/Searching/Trie-Search/Trie_Search.ll (Z6searchP4TriePc)

; 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.Trie = type { 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: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z6searchP4TriePc(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
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %8 = load ptr, ptr %4, align 8, !tbaa !5
  %9 = icmp eq ptr %8, null
  br i1 %9, label %10, label %11

10:                                               ; preds = %2
  store i32 0, ptr %3, align 4
  br label %38

11:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %12, ptr %6, align 8, !tbaa !5
  br label %13

13:                                               ; preds = %30, %11
  %14 = load ptr, ptr %5, align 8, !tbaa !5
  %15 = load i8, ptr %14, align 1, !tbaa !9
  %16 = icmp ne i8 %15, 0
  br i1 %16, label %17, label %33

17:                                               ; preds = %13
  %18 = load ptr, ptr %6, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.Trie, ptr %18, i32 0, i32 1
  %20 = load ptr, ptr %5, align 8, !tbaa !5
  %21 = load i8, ptr %20, align 1, !tbaa !9
  %22 = sext i8 %21 to i32
  %23 = sub nsw i32 %22, 97
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [26 x ptr], ptr %19, i64 0, i64 %24
  %26 = load ptr, ptr %25, align 8, !tbaa !5
  store ptr %26, ptr %6, align 8, !tbaa !5
  %27 = load ptr, ptr %6, align 8, !tbaa !5
  %28 = icmp eq ptr %27, null
  br i1 %28, label %29, label %30

29:                                               ; preds = %17
  store i32 0, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %37

30:                                               ; preds = %17
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = getelementptr inbounds i8, ptr %31, i32 1
  store ptr %32, ptr %5, align 8, !tbaa !5
  br label %13, !llvm.loop !10

33:                                               ; preds = %13
  %34 = load ptr, ptr %6, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.Trie, ptr %34, i32 0, i32 0
  %36 = load i32, ptr %35, align 8, !tbaa !12
  store i32 %36, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %37

37:                                               ; preds = %33, %29
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %38

38:                                               ; preds = %37, %10
  %39 = load i32, ptr %3, align 4
  ret i32 %39
}

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 = { 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 0}
!13 = !{!"_ZTS4Trie", !14, i64 0, !7, i64 8}
!14 = !{!"int", !7, i64 0}


; 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 norecurse nosync nounwind willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local noundef i32 @_Z6searchP4TriePc(ptr noundef readonly %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 {
  %3 = icmp eq ptr %0, null
  br i1 %3, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %2
  %4 = load i8, ptr %1, align 1, !tbaa !5
  %.not14 = icmp eq i8 %4, 0
  br i1 %.not14, label %._crit_edge, label %.lr.ph

5:                                                ; preds = %.lr.ph
  %6 = getelementptr inbounds i8, ptr %.0815, i64 1
  %7 = load i8, ptr %6, align 1, !tbaa !5
  %.not = icmp eq i8 %7, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !8

.lr.ph:                                           ; preds = %.preheader, %5
  %8 = phi i8 [ %7, %5 ], [ %4, %.preheader ]
  %.016 = phi ptr [ %13, %5 ], [ %0, %.preheader ]
  %.0815 = phi ptr [ %6, %5 ], [ %1, %.preheader ]
  %9 = getelementptr inbounds i8, ptr %.016, i64 8
  %10 = sext i8 %8 to i64
  %11 = add nsw i64 %10, -97
  %12 = getelementptr inbounds [26 x ptr], ptr %9, i64 0, i64 %11
  %13 = load ptr, ptr %12, align 8, !tbaa !10
  %14 = icmp eq ptr %13, null
  br i1 %14, label %.loopexit, label %5

._crit_edge:                                      ; preds = %5, %.preheader
  %.0.lcssa = phi ptr [ %0, %.preheader ], [ %13, %5 ]
  %15 = load i32, ptr %.0.lcssa, align 8, !tbaa !12
  br label %.loopexit

.loopexit:                                        ; preds = %.lr.ph, %._crit_edge, %2
  %.1 = phi i32 [ 0, %2 ], [ %15, %._crit_edge ], [ 0, %.lr.ph ]
  ret i32 %.1
}

attributes #0 = { mustprogress nofree norecurse nosync 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" }

!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++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}
!10 = !{!11, !11, i64 0}
!11 = !{!"any pointer", !6, i64 0}
!12 = !{!13, !14, i64 0}
!13 = !{!"_ZTS4Trie", !14, i64 0, !6, i64 8}
!14 = !{!"int", !6, i64 0}


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