; LLVM IR from brpapa/algorithms :: solutions/spoj/AMR11E.ll (Z5sievev)

; 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"

@numDiffPFs = external dso_local global [2700 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z5sievev() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  call void @llvm.memset.p0.i64(ptr align 16 @numDiffPFs, i8 0, i64 10800, i1 false)
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  store i32 2, ptr %1, align 4, !tbaa !5
  br label %4

4:                                                ; preds = %32, %0
  %5 = load i32, ptr %1, align 4, !tbaa !5
  %6 = icmp slt i32 %5, 2700
  br i1 %6, label %8, label %7

7:                                                ; preds = %4
  store i32 2, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  br label %35

8:                                                ; preds = %4
  %9 = load i32, ptr %1, align 4, !tbaa !5
  %10 = sext i32 %9 to i64
  %11 = getelementptr inbounds [2700 x i32], ptr @numDiffPFs, i64 0, i64 %10
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %13 = icmp eq i32 %12, 0
  br i1 %13, label %14, label %31

14:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  %15 = load i32, ptr %1, align 4, !tbaa !5
  store i32 %15, ptr %3, align 4, !tbaa !5
  br label %16

16:                                               ; preds = %26, %14
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = icmp slt i32 %17, 2700
  br i1 %18, label %20, label %19

19:                                               ; preds = %16
  store i32 5, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  br label %30

20:                                               ; preds = %16
  %21 = load i32, ptr %3, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [2700 x i32], ptr @numDiffPFs, i64 0, i64 %22
  %24 = load i32, ptr %23, align 4, !tbaa !5
  %25 = add nsw i32 %24, 1
  store i32 %25, ptr %23, align 4, !tbaa !5
  br label %26

26:                                               ; preds = %20
  %27 = load i32, ptr %1, align 4, !tbaa !5
  %28 = load i32, ptr %3, align 4, !tbaa !5
  %29 = add nsw i32 %28, %27
  store i32 %29, ptr %3, align 4, !tbaa !5
  br label %16, !llvm.loop !9

30:                                               ; preds = %19
  br label %31

31:                                               ; preds = %30, %8
  br label %32

32:                                               ; preds = %31
  %33 = load i32, ptr %1, align 4, !tbaa !5
  %34 = add nsw i32 %33, 1
  store i32 %34, ptr %1, align 4, !tbaa !5
  br label %4, !llvm.loop !11

35:                                               ; preds = %7
  ret void
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #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

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 = { nocallback nofree nounwind willreturn memory(argmem: write) }
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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


; 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"

@numDiffPFs = external dso_local local_unnamed_addr global [2700 x i32], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z5sievev() local_unnamed_addr #0 {
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(10800) @numDiffPFs, i8 0, i64 10800, i1 false)
  br label %2

1:                                                ; preds = %.loopexit.1
  ret void

2:                                                ; preds = %.loopexit.1, %0
  %indvars.iv = phi i64 [ 2, %0 ], [ %indvars.iv.next.1, %.loopexit.1 ]
  %3 = getelementptr inbounds [2700 x i32], ptr @numDiffPFs, i64 0, i64 %indvars.iv
  %4 = load i32, ptr %3, align 8, !tbaa !5
  %5 = icmp eq i32 %4, 0
  br i1 %5, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %2, %.lr.ph
  %indvars.iv12 = phi i64 [ %indvars.iv.next13, %.lr.ph ], [ %indvars.iv, %2 ]
  %6 = getelementptr inbounds [2700 x i32], ptr @numDiffPFs, i64 0, i64 %indvars.iv12
  %7 = load i32, ptr %6, align 8, !tbaa !5
  %8 = add nsw i32 %7, 1
  store i32 %8, ptr %6, align 8, !tbaa !5
  %indvars.iv.next13 = add nuw nsw i64 %indvars.iv12, %indvars.iv
  %9 = icmp ult i64 %indvars.iv.next13, 2700
  br i1 %9, label %.lr.ph, label %.loopexit, !llvm.loop !9

.loopexit:                                        ; preds = %.lr.ph, %2
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %10 = getelementptr inbounds [2700 x i32], ptr @numDiffPFs, i64 0, i64 %indvars.iv.next
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %12 = icmp eq i32 %11, 0
  br i1 %12, label %.lr.ph.1, label %.loopexit.1

.lr.ph.1:                                         ; preds = %.loopexit, %.lr.ph.1
  %indvars.iv12.1 = phi i64 [ %indvars.iv.next13.1, %.lr.ph.1 ], [ %indvars.iv.next, %.loopexit ]
  %13 = getelementptr inbounds [2700 x i32], ptr @numDiffPFs, i64 0, i64 %indvars.iv12.1
  %14 = load i32, ptr %13, align 4, !tbaa !5
  %15 = add nsw i32 %14, 1
  store i32 %15, ptr %13, align 4, !tbaa !5
  %indvars.iv.next13.1 = add nuw nsw i64 %indvars.iv12.1, %indvars.iv.next
  %16 = icmp ult i64 %indvars.iv.next13.1, 2700
  br i1 %16, label %.lr.ph.1, label %.loopexit.1, !llvm.loop !9

.loopexit.1:                                      ; preds = %.lr.ph.1, %.loopexit
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %exitcond.not.1 = icmp eq i64 %indvars.iv.next.1, 2700
  br i1 %exitcond.not.1, label %1, label %2, !llvm.loop !11
}

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(readwrite, argmem: none, 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" }
attributes #1 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: write) }

!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++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


; Effective O3 passes: GVNPass,GlobalOptPass,IndVarSimplifyPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass