; LLVM IR from xirc/cp-algorithm :: spoj/giveaway/main.ll (Z6updateii)

; 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"

@X = external dso_local global [500000 x i32], align 16
@Y = external dso_local global [1000 x [500 x i32]], align 16

; 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: inlinehint mustprogress uwtable
declare dso_local void @_ZSt4sortIPiEvT_S1_(ptr noundef, ptr noundef) #1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z6updateii(i32 noundef %0, i32 noundef %1) #2 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  %7 = load i32, ptr %4, align 4, !tbaa !5
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = sext i32 %8 to i64
  %10 = getelementptr inbounds [500000 x i32], ptr @X, i64 0, i64 %9
  store i32 %7, ptr %10, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = sdiv i32 %11, 500
  store i32 %12, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  store i32 0, ptr %6, align 4, !tbaa !5
  br label %13

13:                                               ; preds = %31, %2
  %14 = load i32, ptr %6, align 4, !tbaa !5
  %15 = icmp slt i32 %14, 500
  br i1 %15, label %17, label %16

16:                                               ; preds = %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  br label %34

17:                                               ; preds = %13
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = mul nsw i32 %18, 500
  %20 = load i32, ptr %6, align 4, !tbaa !5
  %21 = add nsw i32 %19, %20
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [500000 x i32], ptr @X, i64 0, i64 %22
  %24 = load i32, ptr %23, align 4, !tbaa !5
  %25 = load i32, ptr %5, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds [1000 x [500 x i32]], ptr @Y, i64 0, i64 %26
  %28 = load i32, ptr %6, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [500 x i32], ptr %27, i64 0, i64 %29
  store i32 %24, ptr %30, align 4, !tbaa !5
  br label %31

31:                                               ; preds = %17
  %32 = load i32, ptr %6, align 4, !tbaa !5
  %33 = add nsw i32 %32, 1
  store i32 %33, ptr %6, align 4, !tbaa !5
  br label %13, !llvm.loop !9

34:                                               ; preds = %16
  %35 = load i32, ptr %5, align 4, !tbaa !5
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds [1000 x [500 x i32]], ptr @Y, i64 0, i64 %36
  %38 = getelementptr inbounds [500 x i32], ptr %37, i64 0, i64 0
  %39 = load i32, ptr %5, align 4, !tbaa !5
  %40 = sext i32 %39 to i64
  %41 = getelementptr inbounds [1000 x [500 x i32]], ptr @Y, i64 0, i64 %40
  %42 = getelementptr inbounds [500 x i32], ptr %41, i64 0, i64 0
  %43 = getelementptr inbounds i32, ptr %42, i64 500
  call void @_ZSt4sortIPiEvT_S1_(ptr noundef %38, ptr noundef %43)
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { inlinehint 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 = { 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 #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"}


; 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"

@X = external dso_local local_unnamed_addr global [500000 x i32], align 16
@Y = external dso_local global [1000 x [500 x i32]], align 16

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_ZSt4sortIPiEvT_S1_(ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z6updateii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #1 {
  %3 = sext i32 %0 to i64
  %4 = getelementptr inbounds [500000 x i32], ptr @X, i64 0, i64 %3
  store i32 %1, ptr %4, align 4, !tbaa !5
  %5 = sdiv i32 %0, 500
  %6 = mul nsw i32 %5, 500
  %7 = sext i32 %5 to i64
  %8 = mul nsw i64 %7, 2000
  %scevgep = getelementptr i8, ptr @Y, i64 %8
  %9 = sext i32 %6 to i64
  %10 = shl nsw i64 %9, 2
  %scevgep12 = getelementptr i8, ptr @X, i64 %10
  tail call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 16 dereferenceable(2000) %scevgep, ptr noundef nonnull align 16 dereferenceable(2000) %scevgep12, i64 2000, i1 false), !tbaa !5
  %11 = getelementptr inbounds [1000 x [500 x i32]], ptr @Y, i64 0, i64 %7
  %12 = getelementptr inbounds i8, ptr %11, i64 2000
  tail call void @_ZSt4sortIPiEvT_S1_(ptr noundef nonnull %11, ptr noundef nonnull %12)
  ret void
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2

attributes #0 = { inlinehint 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 #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 nounwind willreturn memory(argmem: readwrite) }

!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"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LICMPass,LoopIdiomRecognizePass,LoopRotatePass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass