; LLVM IR from AlgoGenesis/C :: Backtracking Algorithms/M - Coloring Problem 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 zeroext i1 @isSafe(ptr noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %3) #0 {
  %5 = alloca i1, align 1
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  store ptr %0, ptr %6, align 8, !tbaa !5
  store ptr %1, ptr %7, align 8, !tbaa !5
  store i32 %2, ptr %8, align 4, !tbaa !9
  store i32 %3, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  store i32 0, ptr %10, align 4, !tbaa !9
  br label %12

12:                                               ; preds = %36, %4
  %13 = load i32, ptr %10, align 4, !tbaa !9
  %14 = icmp slt i32 %13, 4
  br i1 %14, label %16, label %15

15:                                               ; preds = %12
  store i32 2, ptr %11, align 4
  br label %39

16:                                               ; preds = %12
  %17 = load ptr, ptr %6, align 8, !tbaa !5
  %18 = load i32, ptr %8, align 4, !tbaa !9
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [4 x i32], ptr %17, i64 %19
  %21 = load i32, ptr %10, align 4, !tbaa !9
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [4 x i32], ptr %20, i64 0, i64 %22
  %24 = load i32, ptr %23, align 4, !tbaa !9
  %25 = icmp ne i32 %24, 0
  br i1 %25, label %26, label %35

26:                                               ; preds = %16
  %27 = load ptr, ptr %7, align 8, !tbaa !5
  %28 = load i32, ptr %10, align 4, !tbaa !9
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds i32, ptr %27, i64 %29
  %31 = load i32, ptr %30, align 4, !tbaa !9
  %32 = load i32, ptr %9, align 4, !tbaa !9
  %33 = icmp eq i32 %31, %32
  br i1 %33, label %34, label %35

34:                                               ; preds = %26
  store i1 false, ptr %5, align 1
  store i32 1, ptr %11, align 4
  br label %39

35:                                               ; preds = %26, %16
  br label %36

36:                                               ; preds = %35
  %37 = load i32, ptr %10, align 4, !tbaa !9
  %38 = add nsw i32 %37, 1
  store i32 %38, ptr %10, align 4, !tbaa !9
  br label %12, !llvm.loop !11

39:                                               ; preds = %34, %15
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  %40 = load i32, ptr %11, align 4
  switch i32 %40, label %44 [
    i32 2, label %41
    i32 1, label %42
  ]

41:                                               ; preds = %39
  store i1 true, ptr %5, align 1
  br label %42

42:                                               ; preds = %41, %39
  %43 = load i1, ptr %5, align 1
  ret i1 %43

44:                                               ; preds = %39
  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 = !{!"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 = distinct !{!11, !12}
!12 = !{!"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: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef zeroext i1 @isSafe(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = sext i32 %2 to i64
  %6 = getelementptr inbounds [4 x i32], ptr %0, i64 %5, i64 0
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %.not = icmp eq i32 %7, 0
  br i1 %.not, label %11, label %8

8:                                                ; preds = %4
  %9 = load i32, ptr %1, align 4, !tbaa !5
  %10 = icmp eq i32 %9, %3
  br i1 %10, label %33, label %11

11:                                               ; preds = %4, %8
  %12 = getelementptr inbounds [4 x i32], ptr %0, i64 %5, i64 1
  %13 = load i32, ptr %12, align 4, !tbaa !5
  %.not.1 = icmp eq i32 %13, 0
  br i1 %.not.1, label %18, label %14

14:                                               ; preds = %11
  %15 = getelementptr inbounds i8, ptr %1, i64 4
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %17 = icmp eq i32 %16, %3
  br i1 %17, label %33, label %18

18:                                               ; preds = %14, %11
  %19 = getelementptr inbounds [4 x i32], ptr %0, i64 %5, i64 2
  %20 = load i32, ptr %19, align 4, !tbaa !5
  %.not.2 = icmp eq i32 %20, 0
  br i1 %.not.2, label %25, label %21

21:                                               ; preds = %18
  %22 = getelementptr inbounds i8, ptr %1, i64 8
  %23 = load i32, ptr %22, align 4, !tbaa !5
  %24 = icmp eq i32 %23, %3
  br i1 %24, label %33, label %25

25:                                               ; preds = %21, %18
  %26 = getelementptr inbounds [4 x i32], ptr %0, i64 %5, i64 3
  %27 = load i32, ptr %26, align 4, !tbaa !5
  %.not.3 = icmp eq i32 %27, 0
  br i1 %.not.3, label %32, label %28

28:                                               ; preds = %25
  %29 = getelementptr inbounds i8, ptr %1, i64 12
  %30 = load i32, ptr %29, align 4, !tbaa !5
  %31 = icmp eq i32 %30, %3
  br i1 %31, label %33, label %32

32:                                               ; preds = %28, %25
  br label %33

33:                                               ; preds = %32, %28, %21, %14, %8
  %.lcssa = phi i1 [ false, %8 ], [ false, %14 ], [ false, %21 ], [ false, %28 ], [ true, %32 ]
  ret i1 %.lcssa
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn 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"}


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