; LLVM IR from lekkas/c-algorithms :: src/algos (QuickSort)

; 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @partition(ptr noundef %0, i32 noundef %1, i32 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = 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) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  %11 = load i32, ptr %5, align 4, !tbaa !9
  %12 = load i32, ptr %6, align 4, !tbaa !9
  %13 = call i32 @choosePivot(i32 noundef %11, i32 noundef %12)
  store i32 %13, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = load i32, ptr %8, align 4, !tbaa !9
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds i32, ptr %14, i64 %16
  %18 = load i32, ptr %17, align 4, !tbaa !9
  store i32 %18, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  %19 = load i32, ptr %5, align 4, !tbaa !9
  store i32 %19, ptr %10, align 4, !tbaa !9
  %20 = load ptr, ptr %4, align 8, !tbaa !5
  %21 = load i32, ptr %6, align 4, !tbaa !9
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds i32, ptr %20, i64 %22
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = load i32, ptr %8, align 4, !tbaa !9
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds i32, ptr %24, i64 %26
  call void @swap(ptr noundef %23, ptr noundef %27)
  %28 = load i32, ptr %5, align 4, !tbaa !9
  store i32 %28, ptr %7, align 4, !tbaa !9
  br label %29

29:                                               ; preds = %53, %3
  %30 = load i32, ptr %7, align 4, !tbaa !9
  %31 = load i32, ptr %6, align 4, !tbaa !9
  %32 = icmp slt i32 %30, %31
  br i1 %32, label %33, label %56

33:                                               ; preds = %29
  %34 = load ptr, ptr %4, align 8, !tbaa !5
  %35 = load i32, ptr %7, align 4, !tbaa !9
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds i32, ptr %34, i64 %36
  %38 = load i32, ptr %37, align 4, !tbaa !9
  %39 = load i32, ptr %9, align 4, !tbaa !9
  %40 = icmp slt i32 %38, %39
  br i1 %40, label %41, label %52

41:                                               ; preds = %33
  %42 = load ptr, ptr %4, align 8, !tbaa !5
  %43 = load i32, ptr %7, align 4, !tbaa !9
  %44 = sext i32 %43 to i64
  %45 = getelementptr inbounds i32, ptr %42, i64 %44
  %46 = load ptr, ptr %4, align 8, !tbaa !5
  %47 = load i32, ptr %10, align 4, !tbaa !9
  %48 = sext i32 %47 to i64
  %49 = getelementptr inbounds i32, ptr %46, i64 %48
  call void @swap(ptr noundef %45, ptr noundef %49)
  %50 = load i32, ptr %10, align 4, !tbaa !9
  %51 = add nsw i32 %50, 1
  store i32 %51, ptr %10, align 4, !tbaa !9
  br label %52

52:                                               ; preds = %41, %33
  br label %53

53:                                               ; preds = %52
  %54 = load i32, ptr %7, align 4, !tbaa !9
  %55 = add nsw i32 %54, 1
  store i32 %55, ptr %7, align 4, !tbaa !9
  br label %29, !llvm.loop !11

56:                                               ; preds = %29
  %57 = load ptr, ptr %4, align 8, !tbaa !5
  %58 = load i32, ptr %10, align 4, !tbaa !9
  %59 = sext i32 %58 to i64
  %60 = getelementptr inbounds i32, ptr %57, i64 %59
  %61 = load ptr, ptr %4, align 8, !tbaa !5
  %62 = load i32, ptr %8, align 4, !tbaa !9
  %63 = sext i32 %62 to i64
  %64 = getelementptr inbounds i32, ptr %61, i64 %63
  call void @swap(ptr noundef %60, ptr noundef %64)
  %65 = load i32, ptr %10, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  ret i32 %65
}

; 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
declare dso_local i32 @choosePivot(i32 noundef, i32 noundef) #1

declare void @swap(ptr noundef, ptr noundef) #2

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 = { "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 = !{!"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"}


; 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
define dso_local i32 @partition(ptr noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = tail call i32 @choosePivot(i32 noundef %1, i32 noundef %2)
  %5 = sext i32 %4 to i64
  %6 = getelementptr inbounds i32, ptr %0, i64 %5
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %8 = sext i32 %2 to i64
  %9 = getelementptr inbounds i32, ptr %0, i64 %8
  tail call void @swap(ptr noundef %9, ptr noundef nonnull %6) #2
  %10 = icmp slt i32 %1, %2
  br i1 %10, label %.lr.ph.preheader, label %._crit_edge

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

.lr.ph:                                           ; preds = %.lr.ph.preheader, %19
  %indvars.iv = phi i64 [ %11, %.lr.ph.preheader ], [ %indvars.iv.next, %19 ]
  %.027 = phi i32 [ %1, %.lr.ph.preheader ], [ %.1, %19 ]
  %12 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %13 = load i32, ptr %12, align 4, !tbaa !5
  %14 = icmp slt i32 %13, %7
  br i1 %14, label %15, label %19

15:                                               ; preds = %.lr.ph
  %16 = sext i32 %.027 to i64
  %17 = getelementptr inbounds i32, ptr %0, i64 %16
  tail call void @swap(ptr noundef nonnull %12, ptr noundef %17) #2
  %18 = add nsw i32 %.027, 1
  br label %19

19:                                               ; preds = %.lr.ph, %15
  %.1 = phi i32 [ %18, %15 ], [ %.027, %.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

._crit_edge:                                      ; preds = %19, %3
  %.0.lcssa = phi i32 [ %1, %3 ], [ %.1, %19 ]
  %20 = sext i32 %.0.lcssa to i64
  %21 = getelementptr inbounds i32, ptr %0, i64 %20
  tail call void @swap(ptr noundef %21, ptr noundef nonnull %6) #2
  ret i32 %.0.lcssa
}

; Function Attrs: nounwind uwtable
declare dso_local i32 @choosePivot(i32 noundef, i32 noundef) local_unnamed_addr #0

declare void @swap(ptr noundef, ptr noundef) 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 = { "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"}


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