; LLVM IR from PetarV-/Algorithms :: Recursion, Backtracking etc./Permutations.ll (Z20generatePermutationsi)

; 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"

@n = external dso_local global i32, align 4
@niz = external dso_local global [100 x i32], align 16
@inPerm = external dso_local global [100 x i8], align 16
@currPerm = external dso_local global [100 x i32], align 16
@.str = external hidden unnamed_addr constant [4 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z20generatePermutationsi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  %5 = load i32, ptr %2, align 4, !tbaa !5
  %6 = load i32, ptr @n, align 4, !tbaa !5
  %7 = icmp eq i32 %5, %6
  br i1 %7, label %8, label %25

8:                                                ; preds = %1
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 0, ptr %3, align 4, !tbaa !5
  br label %9

9:                                                ; preds = %20, %8
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = load i32, ptr @n, align 4, !tbaa !5
  %12 = icmp slt i32 %10, %11
  br i1 %12, label %14, label %13

13:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  br label %23

14:                                               ; preds = %9
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [100 x i32], ptr @currPerm, i64 0, i64 %16
  %18 = load i32, ptr %17, align 4, !tbaa !5
  %19 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %18)
  br label %20

20:                                               ; preds = %14
  %21 = load i32, ptr %3, align 4, !tbaa !5
  %22 = add nsw i32 %21, 1
  store i32 %22, ptr %3, align 4, !tbaa !5
  br label %9, !llvm.loop !9

23:                                               ; preds = %13
  %24 = call i32 (ptr, ...) @printf(ptr noundef @.str.1)
  br label %25

25:                                               ; preds = %23, %1
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store i32 0, ptr %4, align 4, !tbaa !5
  br label %26

26:                                               ; preds = %54, %25
  %27 = load i32, ptr %4, align 4, !tbaa !5
  %28 = load i32, ptr @n, align 4, !tbaa !5
  %29 = icmp slt i32 %27, %28
  br i1 %29, label %31, label %30

30:                                               ; preds = %26
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  br label %57

31:                                               ; preds = %26
  %32 = load i32, ptr %4, align 4, !tbaa !5
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds [100 x i8], ptr @inPerm, i64 0, i64 %33
  %35 = load i8, ptr %34, align 1, !tbaa !11, !range !13, !noundef !14
  %36 = trunc i8 %35 to i1
  br i1 %36, label %53, label %37

37:                                               ; preds = %31
  %38 = load i32, ptr %4, align 4, !tbaa !5
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds [100 x i32], ptr @niz, i64 0, i64 %39
  %41 = load i32, ptr %40, align 4, !tbaa !5
  %42 = load i32, ptr %2, align 4, !tbaa !5
  %43 = sext i32 %42 to i64
  %44 = getelementptr inbounds [100 x i32], ptr @currPerm, i64 0, i64 %43
  store i32 %41, ptr %44, align 4, !tbaa !5
  %45 = load i32, ptr %4, align 4, !tbaa !5
  %46 = sext i32 %45 to i64
  %47 = getelementptr inbounds [100 x i8], ptr @inPerm, i64 0, i64 %46
  store i8 1, ptr %47, align 1, !tbaa !11
  %48 = load i32, ptr %2, align 4, !tbaa !5
  %49 = add nsw i32 %48, 1
  call void @_Z20generatePermutationsi(i32 noundef %49)
  %50 = load i32, ptr %4, align 4, !tbaa !5
  %51 = sext i32 %50 to i64
  %52 = getelementptr inbounds [100 x i8], ptr @inPerm, i64 0, i64 %51
  store i8 0, ptr %52, align 1, !tbaa !11
  br label %53

53:                                               ; preds = %37, %31
  br label %54

54:                                               ; preds = %53
  %55 = load i32, ptr %4, align 4, !tbaa !5
  %56 = add nsw i32 %55, 1
  store i32 %56, ptr %4, align 4, !tbaa !5
  br label %26, !llvm.loop !15

57:                                               ; preds = %30
  ret void
}

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

declare i32 @printf(ptr noundef, ...) #2

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

attributes #0 = { mustprogress 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 = { "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 #3 = { 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++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!12, !12, i64 0}
!12 = !{!"bool", !7, i64 0}
!13 = !{i8 0, i8 2}
!14 = !{}
!15 = distinct !{!15, !10}


; 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"

@n = external dso_local local_unnamed_addr global i32, align 4
@niz = external dso_local local_unnamed_addr global [100 x i32], align 16
@inPerm = external dso_local local_unnamed_addr global [100 x i8], align 16
@currPerm = external dso_local local_unnamed_addr global [100 x i32], align 16
@.str = external hidden unnamed_addr constant [4 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: mustprogress nofree nounwind uwtable
define dso_local void @_Z20generatePermutationsi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @n, align 4, !tbaa !5
  %3 = icmp eq i32 %2, %0
  br i1 %3, label %.preheader, label %12

.preheader:                                       ; preds = %1
  %4 = icmp sgt i32 %0, 0
  br i1 %4, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph, %.preheader
  %5 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1)
  %.pre = load i32, ptr @n, align 4, !tbaa !5
  br label %12

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %.preheader ]
  %6 = getelementptr inbounds [100 x i32], ptr @currPerm, i64 0, i64 %indvars.iv
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %8 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %7)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %9 = load i32, ptr @n, align 4, !tbaa !5
  %10 = sext i32 %9 to i64
  %11 = icmp slt i64 %indvars.iv.next, %10
  br i1 %11, label %.lr.ph, label %._crit_edge, !llvm.loop !9

12:                                               ; preds = %._crit_edge, %1
  %13 = phi i32 [ %.pre, %._crit_edge ], [ %2, %1 ]
  %14 = icmp sgt i32 %13, 0
  br i1 %14, label %.lr.ph16, label %._crit_edge17

.lr.ph16:                                         ; preds = %12
  %15 = sext i32 %0 to i64
  %16 = getelementptr inbounds [100 x i32], ptr @currPerm, i64 0, i64 %15
  %17 = add nsw i32 %0, 1
  br label %18

._crit_edge17:                                    ; preds = %26, %12
  ret void

18:                                               ; preds = %.lr.ph16, %26
  %19 = phi i32 [ %13, %.lr.ph16 ], [ %27, %26 ]
  %indvars.iv19 = phi i64 [ 0, %.lr.ph16 ], [ %indvars.iv.next20, %26 ]
  %20 = getelementptr inbounds [100 x i8], ptr @inPerm, i64 0, i64 %indvars.iv19
  %21 = load i8, ptr %20, align 1, !tbaa !11, !range !13, !noundef !14
  %22 = trunc nuw i8 %21 to i1
  br i1 %22, label %26, label %23

23:                                               ; preds = %18
  %24 = getelementptr inbounds [100 x i32], ptr @niz, i64 0, i64 %indvars.iv19
  %25 = load i32, ptr %24, align 4, !tbaa !5
  store i32 %25, ptr %16, align 4, !tbaa !5
  store i8 1, ptr %20, align 1, !tbaa !11
  tail call void @_Z20generatePermutationsi(i32 noundef %17)
  store i8 0, ptr %20, align 1, !tbaa !11
  %.pre22 = load i32, ptr @n, align 4, !tbaa !5
  br label %26

26:                                               ; preds = %18, %23
  %27 = phi i32 [ %19, %18 ], [ %.pre22, %23 ]
  %indvars.iv.next20 = add nuw nsw i64 %indvars.iv19, 1
  %28 = sext i32 %27 to i64
  %29 = icmp slt i64 %indvars.iv.next20, %28
  br i1 %29, label %18, label %._crit_edge17, !llvm.loop !15
}

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

attributes #0 = { mustprogress nofree 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 = { nofree nounwind "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++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!12, !12, i64 0}
!12 = !{!"bool", !7, i64 0}
!13 = !{i8 0, i8 2}
!14 = !{}
!15 = distinct !{!15, !10}


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