; LLVM IR from xxks-kkk/algo :: sorting (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"

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

; 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 void @merge(ptr noundef, ptr noundef, i32 noundef, i32 noundef, i32 noundef) #1

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #2

; Function Attrs: nounwind uwtable
define dso_local void @mergeSortNonRecursive(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #4
  %10 = load i32, ptr %4, align 4, !tbaa !9
  %11 = sext i32 %10 to i64
  %12 = mul i64 4, %11
  %13 = call noalias ptr @malloc(i64 noundef %12) #5
  store ptr %13, ptr %5, align 8, !tbaa !5
  store i32 1, ptr %6, align 4, !tbaa !9
  br label %14

14:                                               ; preds = %45, %2
  %15 = load i32, ptr %6, align 4, !tbaa !9
  %16 = load i32, ptr %4, align 4, !tbaa !9
  %17 = icmp slt i32 %15, %16
  br i1 %17, label %18, label %48

18:                                               ; preds = %14
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %19

19:                                               ; preds = %26, %18
  %20 = load i32, ptr %7, align 4, !tbaa !9
  %21 = load i32, ptr %6, align 4, !tbaa !9
  %22 = add nsw i32 %20, %21
  %23 = load i32, ptr %4, align 4, !tbaa !9
  %24 = sub nsw i32 %23, 1
  %25 = icmp slt i32 %22, %24
  br i1 %25, label %26, label %44

26:                                               ; preds = %19
  %27 = load i32, ptr %7, align 4, !tbaa !9
  %28 = load i32, ptr %6, align 4, !tbaa !9
  %29 = add nsw i32 %27, %28
  store i32 %29, ptr %8, align 4, !tbaa !9
  %30 = load i32, ptr %4, align 4, !tbaa !9
  %31 = sub nsw i32 %30, 1
  %32 = load i32, ptr %8, align 4, !tbaa !9
  %33 = load i32, ptr %6, align 4, !tbaa !9
  %34 = add nsw i32 %32, %33
  %35 = sub nsw i32 %34, 1
  %36 = call i32 @min(i32 noundef %31, i32 noundef %35)
  store i32 %36, ptr %9, align 4, !tbaa !9
  %37 = load ptr, ptr %3, align 8, !tbaa !5
  %38 = load ptr, ptr %5, align 8, !tbaa !5
  %39 = load i32, ptr %7, align 4, !tbaa !9
  %40 = load i32, ptr %8, align 4, !tbaa !9
  %41 = load i32, ptr %9, align 4, !tbaa !9
  call void @merge(ptr noundef %37, ptr noundef %38, i32 noundef %39, i32 noundef %40, i32 noundef %41)
  %42 = load i32, ptr %9, align 4, !tbaa !9
  %43 = add nsw i32 %42, 1
  store i32 %43, ptr %7, align 4, !tbaa !9
  br label %19, !llvm.loop !11

44:                                               ; preds = %19
  br label %45

45:                                               ; preds = %44
  %46 = load i32, ptr %6, align 4, !tbaa !9
  %47 = mul nsw i32 %46, 2
  store i32 %47, ptr %6, align 4, !tbaa !9
  br label %14, !llvm.loop !13

48:                                               ; preds = %14
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #4
  ret void
}

declare i32 @min(i32 noundef, i32 noundef) #3

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 = { nounwind allocsize(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 #3 = { "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 #4 = { nounwind }
attributes #5 = { nounwind allocsize(0) }

!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"

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

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local void @mergeSortNonRecursive(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = sext i32 %1 to i64
  %4 = shl nsw i64 %3, 2
  %5 = tail call noalias ptr @malloc(i64 noundef %4) #3
  %6 = icmp sgt i32 %1, 1
  br i1 %6, label %.preheader.lr.ph, label %._crit_edge23

.preheader.lr.ph:                                 ; preds = %2
  %7 = add nsw i32 %1, -1
  br label %.preheader

.preheader:                                       ; preds = %.preheader.lr.ph, %._crit_edge
  %.022 = phi i32 [ 1, %.preheader.lr.ph ], [ %17, %._crit_edge ]
  %8 = icmp slt i32 %.022, %7
  br i1 %8, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %.preheader
  %9 = add i32 %.022, -1
  br label %10

10:                                               ; preds = %.lr.ph, %10
  %11 = phi i32 [ %.022, %.lr.ph ], [ %15, %10 ]
  %.01721 = phi i32 [ 0, %.lr.ph ], [ %14, %10 ]
  %12 = add i32 %9, %11
  %13 = tail call i32 @min(i32 noundef %7, i32 noundef %12) #4
  tail call void @merge(ptr noundef %0, ptr noundef %5, i32 noundef %.01721, i32 noundef %11, i32 noundef %13)
  %14 = add nsw i32 %13, 1
  %15 = add nsw i32 %14, %.022
  %16 = icmp slt i32 %15, %7
  br i1 %16, label %10, label %._crit_edge, !llvm.loop !5

._crit_edge:                                      ; preds = %10, %.preheader
  %17 = shl nsw i32 %.022, 1
  %18 = icmp slt i32 %17, %1
  br i1 %18, label %.preheader, label %._crit_edge23, !llvm.loop !7

._crit_edge23:                                    ; preds = %._crit_edge, %2
  ret void
}

declare i32 @min(i32 noundef, i32 noundef) local_unnamed_addr #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 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 allocsize(0) }
attributes #4 = { 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}
!7 = distinct !{!7, !6}


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