; LLVM IR from freddiev4/dailyprogrammerchallenges :: Easy Challenges/Challenge 0177 Easy - Quicksort/solutions (solution)

; 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
declare dso_local void @swap(ptr noundef, ptr noundef) #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 @partition(ptr noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca float, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store i32 %2, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = load i32, ptr %6, align 4, !tbaa !9
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds float, ptr %10, i64 %12
  %14 = load float, ptr %13, align 4, !tbaa !11
  store float %14, ptr %7, align 4, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %15 = load i32, ptr %5, align 4, !tbaa !9
  store i32 %15, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %16 = load i32, ptr %5, align 4, !tbaa !9
  store i32 %16, ptr %9, align 4, !tbaa !9
  br label %17

17:                                               ; preds = %42, %3
  %18 = load i32, ptr %9, align 4, !tbaa !9
  %19 = load i32, ptr %6, align 4, !tbaa !9
  %20 = icmp slt i32 %18, %19
  br i1 %20, label %22, label %21

21:                                               ; preds = %17
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  br label %45

22:                                               ; preds = %17
  %23 = load ptr, ptr %4, align 8, !tbaa !5
  %24 = load i32, ptr %9, align 4, !tbaa !9
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds float, ptr %23, i64 %25
  %27 = load float, ptr %26, align 4, !tbaa !11
  %28 = load float, ptr %7, align 4, !tbaa !11
  %29 = fcmp ole float %27, %28
  br i1 %29, label %30, label %41

30:                                               ; preds = %22
  %31 = load ptr, ptr %4, align 8, !tbaa !5
  %32 = load i32, ptr %8, align 4, !tbaa !9
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds float, ptr %31, i64 %33
  %35 = load ptr, ptr %4, align 8, !tbaa !5
  %36 = load i32, ptr %9, align 4, !tbaa !9
  %37 = sext i32 %36 to i64
  %38 = getelementptr inbounds float, ptr %35, i64 %37
  call void @swap(ptr noundef %34, ptr noundef %38)
  %39 = load i32, ptr %8, align 4, !tbaa !9
  %40 = add nsw i32 %39, 1
  store i32 %40, ptr %8, align 4, !tbaa !9
  br label %41

41:                                               ; preds = %30, %22
  br label %42

42:                                               ; preds = %41
  %43 = load i32, ptr %9, align 4, !tbaa !9
  %44 = add nsw i32 %43, 1
  store i32 %44, ptr %9, align 4, !tbaa !9
  br label %17, !llvm.loop !13

45:                                               ; preds = %21
  %46 = load ptr, ptr %4, align 8, !tbaa !5
  %47 = load i32, ptr %8, align 4, !tbaa !9
  %48 = sext i32 %47 to i64
  %49 = getelementptr inbounds float, ptr %46, i64 %48
  %50 = load ptr, ptr %4, align 8, !tbaa !5
  %51 = load i32, ptr %6, align 4, !tbaa !9
  %52 = sext i32 %51 to i64
  %53 = getelementptr inbounds float, ptr %50, i64 %52
  call void @swap(ptr noundef %49, ptr noundef %53)
  %54 = load i32, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret i32 %54
}

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 = !{!12, !12, i64 0}
!12 = !{!"float", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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: nounwind uwtable
declare dso_local void @swap(ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local i32 @partition(ptr noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = sext i32 %2 to i64
  %5 = getelementptr inbounds float, ptr %0, i64 %4
  %6 = load float, ptr %5, align 4, !tbaa !5
  %7 = icmp slt i32 %1, %2
  br i1 %7, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %3
  %8 = sext i32 %1 to i64
  br label %.lr.ph

._crit_edge:                                      ; preds = %18, %3
  %.019.lcssa = phi i32 [ %1, %3 ], [ %.1, %18 ]
  %9 = sext i32 %.019.lcssa to i64
  %10 = getelementptr inbounds float, ptr %0, i64 %9
  tail call void @swap(ptr noundef %10, ptr noundef nonnull %5)
  ret i32 %.019.lcssa

.lr.ph:                                           ; preds = %.lr.ph.preheader, %18
  %indvars.iv = phi i64 [ %8, %.lr.ph.preheader ], [ %indvars.iv.next, %18 ]
  %.01920 = phi i32 [ %1, %.lr.ph.preheader ], [ %.1, %18 ]
  %11 = getelementptr inbounds float, ptr %0, i64 %indvars.iv
  %12 = load float, ptr %11, align 4, !tbaa !5
  %13 = fcmp ugt float %12, %6
  br i1 %13, label %18, label %14

14:                                               ; preds = %.lr.ph
  %15 = sext i32 %.01920 to i64
  %16 = getelementptr inbounds float, ptr %0, i64 %15
  tail call void @swap(ptr noundef %16, ptr noundef nonnull %11)
  %17 = add nsw i32 %.01920, 1
  br label %18

18:                                               ; preds = %.lr.ph, %14
  %.1 = phi i32 [ %17, %14 ], [ %.01920, %.lr.ph ]
  %indvars.iv.next = add nsw i64 %indvars.iv, 1
  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
  %exitcond.not = icmp eq i32 %lftr.wideiv, %2
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9
}

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" }

!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 = !{!"float", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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