; LLVM IR from tangjz/acm-icpc :: 51nod/1753.ll (Z9dsu_mergeii)

; 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"

@dsu = external dso_local global [27 x i32], align 16

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z8dsu_findi(i32 noundef) #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z9dsu_mergeii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  %5 = load i32, ptr %3, align 4, !tbaa !5
  %6 = call noundef i32 @_Z8dsu_findi(i32 noundef %5)
  store i32 %6, ptr %3, align 4, !tbaa !5
  %7 = load i32, ptr %4, align 4, !tbaa !5
  %8 = call noundef i32 @_Z8dsu_findi(i32 noundef %7)
  store i32 %8, ptr %4, align 4, !tbaa !5
  %9 = load i32, ptr %3, align 4, !tbaa !5
  %10 = load i32, ptr %4, align 4, !tbaa !5
  %11 = icmp eq i32 %9, %10
  br i1 %11, label %12, label %13

12:                                               ; preds = %2
  br label %49

13:                                               ; preds = %2
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [27 x i32], ptr @dsu, i64 0, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = load i32, ptr %4, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [27 x i32], ptr @dsu, i64 0, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %22 = icmp slt i32 %17, %21
  br i1 %22, label %23, label %28

23:                                               ; preds = %13
  %24 = load i32, ptr %3, align 4, !tbaa !5
  %25 = load i32, ptr %4, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds [27 x i32], ptr @dsu, i64 0, i64 %26
  store i32 %24, ptr %27, align 4, !tbaa !5
  br label %49

28:                                               ; preds = %13
  %29 = load i32, ptr %3, align 4, !tbaa !5
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds [27 x i32], ptr @dsu, i64 0, i64 %30
  %32 = load i32, ptr %31, align 4, !tbaa !5
  %33 = load i32, ptr %4, align 4, !tbaa !5
  %34 = sext i32 %33 to i64
  %35 = getelementptr inbounds [27 x i32], ptr @dsu, i64 0, i64 %34
  %36 = load i32, ptr %35, align 4, !tbaa !5
  %37 = icmp eq i32 %32, %36
  br i1 %37, label %38, label %44

38:                                               ; preds = %28
  %39 = load i32, ptr %4, align 4, !tbaa !5
  %40 = sext i32 %39 to i64
  %41 = getelementptr inbounds [27 x i32], ptr @dsu, i64 0, i64 %40
  %42 = load i32, ptr %41, align 4, !tbaa !5
  %43 = add nsw i32 %42, -1
  store i32 %43, ptr %41, align 4, !tbaa !5
  br label %44

44:                                               ; preds = %38, %28
  %45 = load i32, ptr %4, align 4, !tbaa !5
  %46 = load i32, ptr %3, align 4, !tbaa !5
  %47 = sext i32 %46 to i64
  %48 = getelementptr inbounds [27 x i32], ptr @dsu, i64 0, i64 %47
  store i32 %45, ptr %48, align 4, !tbaa !5
  br label %49

49:                                               ; preds = %44, %23, %12
  ret void
}

attributes #0 = { 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 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


; 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"

@dsu = external dso_local local_unnamed_addr global [27 x i32], align 16

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z8dsu_findi(i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z9dsu_mergeii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = tail call noundef i32 @_Z8dsu_findi(i32 noundef %0)
  %4 = tail call noundef i32 @_Z8dsu_findi(i32 noundef %1)
  %5 = icmp eq i32 %3, %4
  br i1 %5, label %20, label %6

6:                                                ; preds = %2
  %7 = sext i32 %3 to i64
  %8 = getelementptr inbounds [27 x i32], ptr @dsu, i64 0, i64 %7
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = sext i32 %4 to i64
  %11 = getelementptr inbounds [27 x i32], ptr @dsu, i64 0, i64 %10
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %13 = icmp slt i32 %9, %12
  br i1 %13, label %14, label %15

14:                                               ; preds = %6
  store i32 %3, ptr %11, align 4, !tbaa !5
  br label %20

15:                                               ; preds = %6
  %16 = icmp eq i32 %9, %12
  br i1 %16, label %17, label %19

17:                                               ; preds = %15
  %18 = add nsw i32 %9, -1
  store i32 %18, ptr %11, align 4, !tbaa !5
  br label %19

19:                                               ; preds = %17, %15
  store i32 %4, ptr %8, align 4, !tbaa !5
  br label %20

20:                                               ; preds = %2, %19, %14
  ret void
}

attributes #0 = { 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 = !{!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,SROAPass,SimplifyCFGPass,TailCallElimPass