; LLVM IR from viveakrt/Competitive-programing :: SPOJ/matsum.ll (Z6updateiii)

; 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"

@a = external dso_local global [2048 x [2048 x i32]], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z6updateiii(i32 noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %4 = alloca i32, align 4
  %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
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %10 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %10, ptr %7, align 4, !tbaa !5
  br label %11

11:                                               ; preds = %39, %3
  %12 = load i32, ptr %7, align 4, !tbaa !5
  %13 = icmp slt i32 %12, 2048
  br i1 %13, label %15, label %14

14:                                               ; preds = %11
  store i32 2, ptr %8, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  br label %46

15:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %16 = load i32, ptr %5, align 4, !tbaa !5
  store i32 %16, ptr %9, align 4, !tbaa !5
  br label %17

17:                                               ; preds = %31, %15
  %18 = load i32, ptr %9, align 4, !tbaa !5
  %19 = icmp slt i32 %18, 2048
  br i1 %19, label %21, label %20

20:                                               ; preds = %17
  store i32 5, ptr %8, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  br label %38

21:                                               ; preds = %17
  %22 = load i32, ptr %6, align 4, !tbaa !5
  %23 = load i32, ptr %7, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [2048 x [2048 x i32]], ptr @a, i64 0, i64 %24
  %26 = load i32, ptr %9, align 4, !tbaa !5
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds [2048 x i32], ptr %25, i64 0, i64 %27
  %29 = load i32, ptr %28, align 4, !tbaa !5
  %30 = add nsw i32 %29, %22
  store i32 %30, ptr %28, align 4, !tbaa !5
  br label %31

31:                                               ; preds = %21
  %32 = load i32, ptr %9, align 4, !tbaa !5
  %33 = load i32, ptr %9, align 4, !tbaa !5
  %34 = sub nsw i32 0, %33
  %35 = and i32 %32, %34
  %36 = load i32, ptr %9, align 4, !tbaa !5
  %37 = add nsw i32 %36, %35
  store i32 %37, ptr %9, align 4, !tbaa !5
  br label %17, !llvm.loop !9

38:                                               ; preds = %20
  br label %39

39:                                               ; preds = %38
  %40 = load i32, ptr %7, align 4, !tbaa !5
  %41 = load i32, ptr %7, align 4, !tbaa !5
  %42 = sub nsw i32 0, %41
  %43 = and i32 %40, %42
  %44 = load i32, ptr %7, align 4, !tbaa !5
  %45 = add nsw i32 %44, %43
  store i32 %45, ptr %7, align 4, !tbaa !5
  br label %11, !llvm.loop !11

46:                                               ; preds = %14
  ret void
}

; 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

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 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 = !{!"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"

@a = external dso_local local_unnamed_addr global [2048 x [2048 x i32]], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z6updateiii(i32 noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp slt i32 %0, 2048
  %5 = icmp slt i32 %1, 2048
  %or.cond = and i1 %4, %5
  br i1 %or.cond, label %.preheader.us, label %._crit_edge16

.preheader.us:                                    ; preds = %3, %._crit_edge.us
  %.01315.us = phi i32 [ %18, %._crit_edge.us ], [ %0, %3 ]
  %6 = sext i32 %.01315.us to i64
  br label %7

7:                                                ; preds = %.preheader.us, %7
  %.014.us = phi i32 [ %1, %.preheader.us ], [ %14, %7 ]
  %8 = sext i32 %.014.us to i64
  %9 = getelementptr inbounds [2048 x [2048 x i32]], ptr @a, i64 0, i64 %6, i64 %8
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %11 = add nsw i32 %10, %2
  store i32 %11, ptr %9, align 4, !tbaa !5
  %12 = sub nsw i32 0, %.014.us
  %13 = and i32 %.014.us, %12
  %14 = add nsw i32 %13, %.014.us
  %15 = icmp slt i32 %14, 2048
  br i1 %15, label %7, label %._crit_edge.us, !llvm.loop !9

._crit_edge.us:                                   ; preds = %7
  %16 = sub nsw i32 0, %.01315.us
  %17 = and i32 %.01315.us, %16
  %18 = add nsw i32 %17, %.01315.us
  %19 = icmp slt i32 %18, 2048
  br i1 %19, label %.preheader.us, label %._crit_edge16, !llvm.loop !11

._crit_edge16:                                    ; preds = %._crit_edge.us, %3
  ret void
}

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" }

!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,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyCFGPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass