; LLVM IR from AlgoGenesis/C :: Backtracking Algorithms/Chess-In-Terminal/src (main)

; 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"

@ENPASSANT_FILES = external hidden constant [8 x i32], align 16

; 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: nounwind uwtable
define dso_local i32 @get_enpassant_file(i32 noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !5
  br label %6

6:                                                ; preds = %21, %1
  %7 = load i32, ptr %4, align 4, !tbaa !5
  %8 = icmp slt i32 %7, 8
  br i1 %8, label %10, label %9

9:                                                ; preds = %6
  store i32 2, ptr %5, align 4
  br label %24

10:                                               ; preds = %6
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = load i32, ptr %4, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [8 x i32], ptr @ENPASSANT_FILES, i64 0, i64 %13
  %15 = load i32, ptr %14, align 4, !tbaa !5
  %16 = and i32 %11, %15
  %17 = icmp ne i32 %16, 0
  br i1 %17, label %18, label %20

18:                                               ; preds = %10
  %19 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %19, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %24

20:                                               ; preds = %10
  br label %21

21:                                               ; preds = %20
  %22 = load i32, ptr %4, align 4, !tbaa !5
  %23 = add nsw i32 %22, 1
  store i32 %23, ptr %4, align 4, !tbaa !5
  br label %6, !llvm.loop !9

24:                                               ; preds = %18, %9
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %25 = load i32, ptr %5, align 4
  switch i32 %25, label %29 [
    i32 2, label %26
    i32 1, label %27
  ]

26:                                               ; preds = %24
  store i32 -1, ptr %2, align 4
  br label %27

27:                                               ; preds = %26, %24
  %28 = load i32, ptr %2, align 4
  ret i32 %28

29:                                               ; preds = %24
  unreachable
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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"

@ENPASSANT_FILES = external hidden local_unnamed_addr constant [8 x i32], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local i32 @get_enpassant_file(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @ENPASSANT_FILES, align 16, !tbaa !5
  %3 = and i32 %2, %0
  %.not = icmp eq i32 %3, 0
  br i1 %.not, label %4, label %25

4:                                                ; preds = %1
  %5 = load i32, ptr getelementptr inbounds (i8, ptr @ENPASSANT_FILES, i64 4), align 4, !tbaa !5
  %6 = and i32 %5, %0
  %.not.1 = icmp eq i32 %6, 0
  br i1 %.not.1, label %7, label %25

7:                                                ; preds = %4
  %8 = load i32, ptr getelementptr inbounds (i8, ptr @ENPASSANT_FILES, i64 8), align 8, !tbaa !5
  %9 = and i32 %8, %0
  %.not.2 = icmp eq i32 %9, 0
  br i1 %.not.2, label %10, label %25

10:                                               ; preds = %7
  %11 = load i32, ptr getelementptr inbounds (i8, ptr @ENPASSANT_FILES, i64 12), align 4, !tbaa !5
  %12 = and i32 %11, %0
  %.not.3 = icmp eq i32 %12, 0
  br i1 %.not.3, label %13, label %25

13:                                               ; preds = %10
  %14 = load i32, ptr getelementptr inbounds (i8, ptr @ENPASSANT_FILES, i64 16), align 16, !tbaa !5
  %15 = and i32 %14, %0
  %.not.4 = icmp eq i32 %15, 0
  br i1 %.not.4, label %16, label %25

16:                                               ; preds = %13
  %17 = load i32, ptr getelementptr inbounds (i8, ptr @ENPASSANT_FILES, i64 20), align 4, !tbaa !5
  %18 = and i32 %17, %0
  %.not.5 = icmp eq i32 %18, 0
  br i1 %.not.5, label %19, label %25

19:                                               ; preds = %16
  %20 = load i32, ptr getelementptr inbounds (i8, ptr @ENPASSANT_FILES, i64 24), align 8, !tbaa !5
  %21 = and i32 %20, %0
  %.not.6 = icmp eq i32 %21, 0
  br i1 %.not.6, label %22, label %25

22:                                               ; preds = %19
  %23 = load i32, ptr getelementptr inbounds (i8, ptr @ENPASSANT_FILES, i64 28), align 4, !tbaa !5
  %24 = and i32 %23, %0
  %.not.7 = icmp eq i32 %24, 0
  %spec.select11 = select i1 %.not.7, i32 -1, i32 7
  br label %25

25:                                               ; preds = %22, %19, %16, %13, %10, %7, %4, %1
  %spec.select = phi i32 [ 0, %1 ], [ 1, %4 ], [ 2, %7 ], [ 3, %10 ], [ 4, %13 ], [ 5, %16 ], [ 6, %19 ], [ %spec.select11, %22 ]
  ret i32 %spec.select
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


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