; LLVM IR from AlgoGenesis/C :: Backtracking Algorithms/Hamiltonian Path Problem (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 zeroext i1 @isSafe(i32 noundef %0, ptr noundef %1, ptr noundef %2, i32 noundef %3) #0 {
  %5 = alloca i1, align 1
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  store i32 %0, ptr %6, align 4, !tbaa !5
  store ptr %1, ptr %7, align 8, !tbaa !9
  store ptr %2, ptr %8, align 8, !tbaa !9
  store i32 %3, ptr %9, align 4, !tbaa !5
  %12 = load ptr, ptr %7, align 8, !tbaa !9
  %13 = load ptr, ptr %8, align 8, !tbaa !9
  %14 = load i32, ptr %9, align 4, !tbaa !5
  %15 = sub nsw i32 %14, 1
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds i32, ptr %13, i64 %16
  %18 = load i32, ptr %17, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [5 x i8], ptr %12, i64 %19
  %21 = load i32, ptr %6, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [5 x i8], ptr %20, i64 0, i64 %22
  %24 = load i8, ptr %23, align 1, !tbaa !11, !range !13, !noundef !14
  %25 = trunc i8 %24 to i1
  br i1 %25, label %27, label %26

26:                                               ; preds = %4
  store i1 false, ptr %5, align 1
  br label %49

27:                                               ; preds = %4
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  store i32 0, ptr %10, align 4, !tbaa !5
  br label %28

28:                                               ; preds = %43, %27
  %29 = load i32, ptr %10, align 4, !tbaa !5
  %30 = load i32, ptr %9, align 4, !tbaa !5
  %31 = icmp slt i32 %29, %30
  br i1 %31, label %33, label %32

32:                                               ; preds = %28
  store i32 2, ptr %11, align 4
  br label %46

33:                                               ; preds = %28
  %34 = load ptr, ptr %8, align 8, !tbaa !9
  %35 = load i32, ptr %10, align 4, !tbaa !5
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds i32, ptr %34, i64 %36
  %38 = load i32, ptr %37, align 4, !tbaa !5
  %39 = load i32, ptr %6, align 4, !tbaa !5
  %40 = icmp eq i32 %38, %39
  br i1 %40, label %41, label %42

41:                                               ; preds = %33
  store i1 false, ptr %5, align 1
  store i32 1, ptr %11, align 4
  br label %46

42:                                               ; preds = %33
  br label %43

43:                                               ; preds = %42
  %44 = load i32, ptr %10, align 4, !tbaa !5
  %45 = add nsw i32 %44, 1
  store i32 %45, ptr %10, align 4, !tbaa !5
  br label %28, !llvm.loop !15

46:                                               ; preds = %41, %32
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  %47 = load i32, ptr %11, align 4
  switch i32 %47, label %51 [
    i32 2, label %48
    i32 1, label %49
  ]

48:                                               ; preds = %46
  store i1 true, ptr %5, align 1
  br label %49

49:                                               ; preds = %48, %46, %26
  %50 = load i1, ptr %5, align 1
  ret i1 %50

51:                                               ; preds = %46
  unreachable
}

; 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"_Bool", !7, i64 0}
!13 = !{i8 0, i8 2}
!14 = !{}
!15 = distinct !{!15, !16}
!16 = !{!"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: read) uwtable
define dso_local zeroext i1 @isSafe(i32 noundef %0, ptr nocapture noundef readonly %1, ptr nocapture noundef readonly %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = sext i32 %3 to i64
  %6 = getelementptr i32, ptr %2, i64 %5
  %7 = getelementptr i8, ptr %6, i64 -4
  %8 = load i32, ptr %7, align 4, !tbaa !5
  %9 = sext i32 %8 to i64
  %10 = sext i32 %0 to i64
  %11 = getelementptr inbounds [5 x i8], ptr %1, i64 %9, i64 %10
  %12 = load i8, ptr %11, align 1, !tbaa !9, !range !11, !noundef !12
  %13 = trunc nuw i8 %12 to i1
  br i1 %13, label %.preheader, label %.loopexit

.preheader:                                       ; preds = %4
  %14 = icmp slt i32 %3, 1
  br i1 %14, label %.loopexit, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %.preheader
  %wide.trip.count = zext nneg i32 %3 to i64
  br label %.lr.ph

15:                                               ; preds = %.lr.ph
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond, label %.loopexit.loopexit.split.loop.exit, label %.lr.ph, !llvm.loop !13

.lr.ph:                                           ; preds = %.lr.ph.preheader, %15
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %15 ]
  %16 = getelementptr inbounds i32, ptr %2, i64 %indvars.iv
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = icmp eq i32 %17, %0
  br i1 %18, label %.loopexit, label %15

.loopexit.loopexit.split.loop.exit:               ; preds = %15
  %19 = icmp sge i64 %indvars.iv.next, %5
  br label %.loopexit

.loopexit:                                        ; preds = %.lr.ph, %.loopexit.loopexit.split.loop.exit, %.preheader, %4
  %.1 = phi i1 [ false, %4 ], [ true, %.preheader ], [ %19, %.loopexit.loopexit.split.loop.exit ], [ false, %.lr.ph ]
  ret i1 %.1
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: read) 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 = !{!10, !10, i64 0}
!10 = !{!"_Bool", !7, i64 0}
!11 = !{i8 0, i8 2}
!12 = !{}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


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