; LLVM IR from AlgoGenesis/C :: String Algorithms/Colussi Algorithm (Program)

; 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: nounwind uwtable
define dso_local void @computePrefixFunction(ptr noundef %0, i32 noundef %1, ptr noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %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 i32 %1, ptr %5, align 4, !tbaa !9
  store ptr %2, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 1, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  store i32 0, ptr %8, align 4, !tbaa !9
  %9 = load ptr, ptr %6, align 8, !tbaa !5
  %10 = getelementptr inbounds i32, ptr %9, i64 0
  store i32 0, ptr %10, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %58, %3
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = load i32, ptr %5, align 4, !tbaa !9
  %14 = icmp slt i32 %12, %13
  br i1 %14, label %15, label %59

15:                                               ; preds = %11
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  %17 = load i32, ptr %7, align 4, !tbaa !9
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds i8, ptr %16, i64 %18
  %20 = load i8, ptr %19, align 1, !tbaa !11
  %21 = sext i8 %20 to i32
  %22 = load ptr, ptr %4, align 8, !tbaa !5
  %23 = load i32, ptr %8, align 4, !tbaa !9
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds i8, ptr %22, i64 %24
  %26 = load i8, ptr %25, align 1, !tbaa !11
  %27 = sext i8 %26 to i32
  %28 = icmp eq i32 %21, %27
  br i1 %28, label %29, label %40

29:                                               ; preds = %15
  %30 = load i32, ptr %8, align 4, !tbaa !9
  %31 = add nsw i32 %30, 1
  %32 = load ptr, ptr %6, align 8, !tbaa !5
  %33 = load i32, ptr %7, align 4, !tbaa !9
  %34 = sext i32 %33 to i64
  %35 = getelementptr inbounds i32, ptr %32, i64 %34
  store i32 %31, ptr %35, align 4, !tbaa !9
  %36 = load i32, ptr %7, align 4, !tbaa !9
  %37 = add nsw i32 %36, 1
  store i32 %37, ptr %7, align 4, !tbaa !9
  %38 = load i32, ptr %8, align 4, !tbaa !9
  %39 = add nsw i32 %38, 1
  store i32 %39, ptr %8, align 4, !tbaa !9
  br label %58

40:                                               ; preds = %15
  %41 = load i32, ptr %8, align 4, !tbaa !9
  %42 = icmp sgt i32 %41, 0
  br i1 %42, label %43, label %50

43:                                               ; preds = %40
  %44 = load ptr, ptr %6, align 8, !tbaa !5
  %45 = load i32, ptr %8, align 4, !tbaa !9
  %46 = sub nsw i32 %45, 1
  %47 = sext i32 %46 to i64
  %48 = getelementptr inbounds i32, ptr %44, i64 %47
  %49 = load i32, ptr %48, align 4, !tbaa !9
  store i32 %49, ptr %8, align 4, !tbaa !9
  br label %57

50:                                               ; preds = %40
  %51 = load ptr, ptr %6, align 8, !tbaa !5
  %52 = load i32, ptr %7, align 4, !tbaa !9
  %53 = sext i32 %52 to i64
  %54 = getelementptr inbounds i32, ptr %51, i64 %53
  store i32 0, ptr %54, align 4, !tbaa !9
  %55 = load i32, ptr %7, align 4, !tbaa !9
  %56 = add nsw i32 %55, 1
  store i32 %56, ptr %7, align 4, !tbaa !9
  br label %57

57:                                               ; preds = %50, %43
  br label %58

58:                                               ; preds = %57, %29
  br label %11, !llvm.loop !12

59:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = !{!10, !10, i64 0}
!10 = !{!"int", !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: nofree norecurse nosync nounwind memory(argmem: readwrite) uwtable
define dso_local void @computePrefixFunction(ptr nocapture noundef readonly %0, i32 noundef %1, ptr nocapture noundef %2) local_unnamed_addr #0 {
  store i32 0, ptr %2, align 4, !tbaa !5
  %invariant.gep = getelementptr i8, ptr %2, i64 -4
  %4 = icmp sgt i32 %1, 1
  br i1 %4, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %3, %24
  %.020 = phi i32 [ %.1, %24 ], [ 0, %3 ]
  %.01719 = phi i32 [ %.118, %24 ], [ 1, %3 ]
  %5 = sext i32 %.01719 to i64
  %6 = getelementptr inbounds i8, ptr %0, i64 %5
  %7 = load i8, ptr %6, align 1, !tbaa !9
  %8 = sext i32 %.020 to i64
  %9 = getelementptr inbounds i8, ptr %0, i64 %8
  %10 = load i8, ptr %9, align 1, !tbaa !9
  %11 = icmp eq i8 %7, %10
  br i1 %11, label %12, label %16

12:                                               ; preds = %.lr.ph
  %13 = add nsw i32 %.020, 1
  %14 = getelementptr inbounds i32, ptr %2, i64 %5
  store i32 %13, ptr %14, align 4, !tbaa !5
  %15 = add nsw i32 %.01719, 1
  br label %24

16:                                               ; preds = %.lr.ph
  %17 = icmp sgt i32 %.020, 0
  br i1 %17, label %18, label %21

18:                                               ; preds = %16
  %19 = zext nneg i32 %.020 to i64
  %gep = getelementptr i32, ptr %invariant.gep, i64 %19
  %20 = load i32, ptr %gep, align 4, !tbaa !5
  br label %24

21:                                               ; preds = %16
  %22 = getelementptr inbounds i32, ptr %2, i64 %5
  store i32 0, ptr %22, align 4, !tbaa !5
  %23 = add nsw i32 %.01719, 1
  br label %24

24:                                               ; preds = %18, %21, %12
  %.118 = phi i32 [ %15, %12 ], [ %.01719, %18 ], [ %23, %21 ]
  %.1 = phi i32 [ %13, %12 ], [ %20, %18 ], [ %.020, %21 ]
  %25 = icmp slt i32 %.118, %1
  br i1 %25, label %.lr.ph, label %._crit_edge, !llvm.loop !10

._crit_edge:                                      ; preds = %24, %3
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: readwrite) 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass