; LLVM IR from VAR-solutions/Algorithms :: Sorting/Bubble Sort/C (bubble_sort)

; 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

; Function Attrs: nounwind uwtable
define dso_local void @bubble_sort(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !9
  store i32 0, ptr %3, align 4, !tbaa !9
  br label %6

6:                                                ; preds = %56, %1
  %7 = load i32, ptr %3, align 4, !tbaa !9
  %8 = load i32, ptr @n, align 4, !tbaa !9
  %9 = icmp slt i32 %7, %8
  br i1 %9, label %10, label %59

10:                                               ; preds = %6
  store i32 0, ptr %4, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %52, %10
  %12 = load i32, ptr %4, align 4, !tbaa !9
  %13 = load i32, ptr @n, align 4, !tbaa !9
  %14 = sub nsw i32 %13, 1
  %15 = icmp slt i32 %12, %14
  br i1 %15, label %16, label %55

16:                                               ; preds = %11
  %17 = load ptr, ptr %2, align 8, !tbaa !5
  %18 = load i32, ptr %4, align 4, !tbaa !9
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds i32, ptr %17, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !9
  %22 = load ptr, ptr %2, align 8, !tbaa !5
  %23 = load i32, ptr %4, align 4, !tbaa !9
  %24 = add nsw i32 %23, 1
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds i32, ptr %22, i64 %25
  %27 = load i32, ptr %26, align 4, !tbaa !9
  %28 = icmp sgt i32 %21, %27
  br i1 %28, label %29, label %51

29:                                               ; preds = %16
  %30 = load ptr, ptr %2, align 8, !tbaa !5
  %31 = load i32, ptr %4, align 4, !tbaa !9
  %32 = add nsw i32 %31, 1
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds i32, ptr %30, i64 %33
  %35 = load i32, ptr %34, align 4, !tbaa !9
  store i32 %35, ptr %5, align 4, !tbaa !9
  %36 = load ptr, ptr %2, align 8, !tbaa !5
  %37 = load i32, ptr %4, align 4, !tbaa !9
  %38 = sext i32 %37 to i64
  %39 = getelementptr inbounds i32, ptr %36, i64 %38
  %40 = load i32, ptr %39, align 4, !tbaa !9
  %41 = load ptr, ptr %2, align 8, !tbaa !5
  %42 = load i32, ptr %4, align 4, !tbaa !9
  %43 = add nsw i32 %42, 1
  %44 = sext i32 %43 to i64
  %45 = getelementptr inbounds i32, ptr %41, i64 %44
  store i32 %40, ptr %45, align 4, !tbaa !9
  %46 = load i32, ptr %5, align 4, !tbaa !9
  %47 = load ptr, ptr %2, align 8, !tbaa !5
  %48 = load i32, ptr %4, align 4, !tbaa !9
  %49 = sext i32 %48 to i64
  %50 = getelementptr inbounds i32, ptr %47, i64 %49
  store i32 %46, ptr %50, align 4, !tbaa !9
  br label %51

51:                                               ; preds = %29, %16
  br label %52

52:                                               ; preds = %51
  %53 = load i32, ptr %4, align 4, !tbaa !9
  %54 = add nsw i32 %53, 1
  store i32 %54, ptr %4, align 4, !tbaa !9
  br label %11, !llvm.loop !11

55:                                               ; preds = %11
  br label %56

56:                                               ; preds = %55
  %57 = load i32, ptr %3, align 4, !tbaa !9
  %58 = add nsw i32 %57, 1
  store i32 %58, ptr %3, align 4, !tbaa !9
  br label %6, !llvm.loop !13

59:                                               ; preds = %6
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret void
}

; 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"}
!13 = distinct !{!13, !12}


; 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

; Function Attrs: nofree norecurse nosync nounwind memory(read, argmem: readwrite, inaccessiblemem: none) uwtable
define dso_local void @bubble_sort(ptr nocapture noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @n, align 4, !tbaa !5
  %or.cond = icmp slt i32 %2, 2
  br i1 %or.cond, label %._crit_edge21, label %.preheader

.preheader:                                       ; preds = %1, %._crit_edge
  %3 = phi i32 [ %20, %._crit_edge ], [ %2, %1 ]
  %.01620 = phi i32 [ %21, %._crit_edge ], [ 0, %1 ]
  %4 = icmp sgt i32 %3, 1
  br i1 %4, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %.preheader
  %.pre = load i32, ptr %0, align 4, !tbaa !5
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %13
  %5 = phi i32 [ %3, %.lr.ph.preheader ], [ %14, %13 ]
  %6 = phi i32 [ %3, %.lr.ph.preheader ], [ %15, %13 ]
  %7 = phi i32 [ %.pre, %.lr.ph.preheader ], [ %16, %13 ]
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %13 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %8 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = icmp sgt i32 %7, %9
  br i1 %10, label %11, label %13

11:                                               ; preds = %.lr.ph
  %12 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  store i32 %7, ptr %8, align 4, !tbaa !5
  store i32 %9, ptr %12, align 4, !tbaa !5
  %.pre24 = load i32, ptr @n, align 4, !tbaa !5
  br label %13

13:                                               ; preds = %.lr.ph, %11
  %14 = phi i32 [ %5, %.lr.ph ], [ %.pre24, %11 ]
  %15 = phi i32 [ %6, %.lr.ph ], [ %.pre24, %11 ]
  %16 = phi i32 [ %9, %.lr.ph ], [ %7, %11 ]
  %17 = add nsw i32 %15, -1
  %18 = sext i32 %17 to i64
  %19 = icmp slt i64 %indvars.iv.next, %18
  br i1 %19, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %13, %.preheader
  %20 = phi i32 [ %3, %.preheader ], [ %14, %13 ]
  %21 = add nuw nsw i32 %.01620, 1
  %22 = icmp slt i32 %21, %20
  br i1 %22, label %.preheader, label %._crit_edge21, !llvm.loop !11

._crit_edge21:                                    ; preds = %._crit_edge, %1
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, argmem: readwrite, inaccessiblemem: 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"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10, !12}
!12 = !{!"llvm.loop.unswitch.partial.disable"}


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