; LLVM IR from PetarV-/Algorithms :: Sorting Algorithms/Bitonic Sorter.ll (Z6MergerPiiii)

; 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: mustprogress nounwind uwtable
declare dso_local void @_Z7compareRiS_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z13BitonicSorterPiii(ptr noundef, i32 noundef, i32 noundef) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress uwtable
define dso_local void @_Z6MergerPiiii(ptr noundef %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) #1 {
  %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
  %10 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store i32 %2, ptr %7, align 4, !tbaa !9
  store i32 %3, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  %11 = load i32, ptr %8, align 4, !tbaa !9
  %12 = load i32, ptr %6, align 4, !tbaa !9
  %13 = sub nsw i32 %11, %12
  %14 = add nsw i32 %13, 1
  %15 = ashr i32 %14, 1
  store i32 %15, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  store i32 0, ptr %10, align 4, !tbaa !9
  br label %16

16:                                               ; preds = %34, %4
  %17 = load i32, ptr %10, align 4, !tbaa !9
  %18 = load i32, ptr %9, align 4, !tbaa !9
  %19 = icmp slt i32 %17, %18
  br i1 %19, label %21, label %20

20:                                               ; preds = %16
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  br label %37

21:                                               ; preds = %16
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = load i32, ptr %6, align 4, !tbaa !9
  %24 = load i32, ptr %10, align 4, !tbaa !9
  %25 = add nsw i32 %23, %24
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds i32, ptr %22, i64 %26
  %28 = load ptr, ptr %5, align 8, !tbaa !5
  %29 = load i32, ptr %8, align 4, !tbaa !9
  %30 = load i32, ptr %10, align 4, !tbaa !9
  %31 = sub nsw i32 %29, %30
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds i32, ptr %28, i64 %32
  call void @_Z7compareRiS_(ptr noundef nonnull align 4 dereferenceable(4) %27, ptr noundef nonnull align 4 dereferenceable(4) %33)
  br label %34

34:                                               ; preds = %21
  %35 = load i32, ptr %10, align 4, !tbaa !9
  %36 = add nsw i32 %35, 1
  store i32 %36, ptr %10, align 4, !tbaa !9
  br label %16, !llvm.loop !11

37:                                               ; preds = %20
  %38 = load ptr, ptr %5, align 8, !tbaa !5
  %39 = load i32, ptr %6, align 4, !tbaa !9
  %40 = load i32, ptr %7, align 4, !tbaa !9
  call void @_Z13BitonicSorterPiii(ptr noundef %38, i32 noundef %39, i32 noundef %40)
  %41 = load ptr, ptr %5, align 8, !tbaa !5
  %42 = load i32, ptr %7, align 4, !tbaa !9
  %43 = add nsw i32 %42, 1
  %44 = load i32, ptr %8, align 4, !tbaa !9
  call void @_Z13BitonicSorterPiii(ptr noundef %41, i32 noundef %43, i32 noundef %44)
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  ret void
}

attributes #0 = { mustprogress 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 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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++ 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: mustprogress nounwind uwtable
declare dso_local void @_Z7compareRiS_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z13BitonicSorterPiii(ptr noundef, i32 noundef, i32 noundef) local_unnamed_addr #1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z6MergerPiiii(ptr noundef %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #1 {
  %reass.sub = sub i32 %3, %1
  %5 = add i32 %reass.sub, 1
  %6 = ashr i32 %5, 1
  %7 = icmp sgt i32 %6, 0
  br i1 %7, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %4
  %8 = sext i32 %1 to i64
  %9 = sext i32 %3 to i64
  %wide.trip.count = zext nneg i32 %6 to i64
  %invariant.gep = getelementptr i32, ptr %0, i64 %8
  br label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %4
  tail call void @_Z13BitonicSorterPiii(ptr noundef %0, i32 noundef %1, i32 noundef %2)
  %10 = add nsw i32 %2, 1
  tail call void @_Z13BitonicSorterPiii(ptr noundef %0, i32 noundef %10, i32 noundef %3)
  ret void

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %.lr.ph ]
  %gep = getelementptr i32, ptr %invariant.gep, i64 %indvars.iv
  %11 = sub nsw i64 %9, %indvars.iv
  %12 = getelementptr inbounds i32, ptr %0, i64 %11
  tail call void @_Z7compareRiS_(ptr noundef nonnull align 4 dereferenceable(4) %gep, ptr noundef nonnull align 4 dereferenceable(4) %12)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !5
}

attributes #0 = { mustprogress 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 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


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