; LLVM IR from sbshah97/DS-Algo-Handbook :: Algorithms/Sort_Algorithms/Shell_Sort (shellSort)

; 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"

@sz = external dso_local global i32, align 4
@ar = external dso_local global [100 x i32], align 16
@.str = external hidden unnamed_addr constant [115 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [58 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [22 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [22 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local void @shellSort() #0

; 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

; Function Attrs: nounwind uwtable
define dso_local i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  %4 = call i32 (ptr, ...) @printf(ptr noundef @.str)
  %5 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef @sz)
  %6 = call i32 (ptr, ...) @printf(ptr noundef @.str.2)
  store i32 0, ptr %2, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %16, %0
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = load i32, ptr @sz, align 4, !tbaa !5
  %10 = icmp slt i32 %8, %9
  br i1 %10, label %11, label %19

11:                                               ; preds = %7
  %12 = load i32, ptr %2, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [100 x i32], ptr @ar, i64 0, i64 %13
  %15 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef %14)
  br label %16

16:                                               ; preds = %11
  %17 = load i32, ptr %2, align 4, !tbaa !5
  %18 = add nsw i32 %17, 1
  store i32 %18, ptr %2, align 4, !tbaa !5
  br label %7, !llvm.loop !9

19:                                               ; preds = %7
  %20 = call i32 (ptr, ...) @printf(ptr noundef @.str.3)
  store i32 0, ptr %2, align 4, !tbaa !5
  br label %21

21:                                               ; preds = %31, %19
  %22 = load i32, ptr %2, align 4, !tbaa !5
  %23 = load i32, ptr @sz, align 4, !tbaa !5
  %24 = icmp slt i32 %22, %23
  br i1 %24, label %25, label %34

25:                                               ; preds = %21
  %26 = load i32, ptr %2, align 4, !tbaa !5
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds [100 x i32], ptr @ar, i64 0, i64 %27
  %29 = load i32, ptr %28, align 4, !tbaa !5
  %30 = call i32 (ptr, ...) @printf(ptr noundef @.str.4, i32 noundef %29)
  br label %31

31:                                               ; preds = %25
  %32 = load i32, ptr %2, align 4, !tbaa !5
  %33 = add nsw i32 %32, 1
  store i32 %33, ptr %2, align 4, !tbaa !5
  br label %21, !llvm.loop !11

34:                                               ; preds = %21
  call void @shellSort()
  %35 = call i32 (ptr, ...) @printf(ptr noundef @.str.5)
  store i32 0, ptr %2, align 4, !tbaa !5
  br label %36

36:                                               ; preds = %46, %34
  %37 = load i32, ptr %2, align 4, !tbaa !5
  %38 = load i32, ptr @sz, align 4, !tbaa !5
  %39 = icmp slt i32 %37, %38
  br i1 %39, label %40, label %49

40:                                               ; preds = %36
  %41 = load i32, ptr %2, align 4, !tbaa !5
  %42 = sext i32 %41 to i64
  %43 = getelementptr inbounds [100 x i32], ptr @ar, i64 0, i64 %42
  %44 = load i32, ptr %43, align 4, !tbaa !5
  %45 = call i32 (ptr, ...) @printf(ptr noundef @.str.4, i32 noundef %44)
  br label %46

46:                                               ; preds = %40
  %47 = load i32, ptr %2, align 4, !tbaa !5
  %48 = add nsw i32 %47, 1
  store i32 %48, ptr %2, align 4, !tbaa !5
  br label %36, !llvm.loop !12

49:                                               ; preds = %36
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  %50 = load i32, ptr %1, align 4
  ret i32 %50
}

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

declare i32 @__isoc99_scanf(ptr noundef, ...) #2

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 = { "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/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}
!12 = distinct !{!12, !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"

@sz = external dso_local global i32, align 4
@ar = external dso_local global [100 x i32], align 16
@.str = external hidden unnamed_addr constant [115 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [58 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [22 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [22 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local void @shellSort() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str)
  %2 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull @sz)
  %3 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2)
  %4 = load i32, ptr @sz, align 4, !tbaa !5
  %5 = icmp sgt i32 %4, 0
  br i1 %5, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %0, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %0 ]
  %6 = getelementptr inbounds [100 x i32], ptr @ar, i64 0, i64 %indvars.iv
  %7 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull %6)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %8 = load i32, ptr @sz, align 4, !tbaa !5
  %9 = sext i32 %8 to i64
  %10 = icmp slt i64 %indvars.iv.next, %9
  br i1 %10, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %0
  %11 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.3)
  %12 = load i32, ptr @sz, align 4, !tbaa !5
  %13 = icmp sgt i32 %12, 0
  br i1 %13, label %.lr.ph13, label %._crit_edge14

.lr.ph13:                                         ; preds = %._crit_edge, %.lr.ph13
  %indvars.iv20 = phi i64 [ %indvars.iv.next21, %.lr.ph13 ], [ 0, %._crit_edge ]
  %14 = getelementptr inbounds [100 x i32], ptr @ar, i64 0, i64 %indvars.iv20
  %15 = load i32, ptr %14, align 4, !tbaa !5
  %16 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.4, i32 noundef %15)
  %indvars.iv.next21 = add nuw nsw i64 %indvars.iv20, 1
  %17 = load i32, ptr @sz, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = icmp slt i64 %indvars.iv.next21, %18
  br i1 %19, label %.lr.ph13, label %._crit_edge14, !llvm.loop !11

._crit_edge14:                                    ; preds = %.lr.ph13, %._crit_edge
  tail call void @shellSort()
  %20 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.5)
  %21 = load i32, ptr @sz, align 4, !tbaa !5
  %22 = icmp sgt i32 %21, 0
  br i1 %22, label %.lr.ph17, label %._crit_edge18

.lr.ph17:                                         ; preds = %._crit_edge14, %.lr.ph17
  %indvars.iv23 = phi i64 [ %indvars.iv.next24, %.lr.ph17 ], [ 0, %._crit_edge14 ]
  %23 = getelementptr inbounds [100 x i32], ptr @ar, i64 0, i64 %indvars.iv23
  %24 = load i32, ptr %23, align 4, !tbaa !5
  %25 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.4, i32 noundef %24)
  %indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1
  %26 = load i32, ptr @sz, align 4, !tbaa !5
  %27 = sext i32 %26 to i64
  %28 = icmp slt i64 %indvars.iv.next24, %27
  br i1 %28, label %.lr.ph17, label %._crit_edge18, !llvm.loop !12

._crit_edge18:                                    ; preds = %.lr.ph17, %._crit_edge14
  ret i32 0
}

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

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #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 = { 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/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}
!12 = distinct !{!12, !10}


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