; LLVM IR from upupming/algorithm :: acwing/算法竞赛进阶指南/0x41-并查集/238. 银河英雄传说.ll (Z5mergeii)

; 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"

@fa = external dso_local global [30010 x i32], align 16
@sz = external dso_local global [30010 x i32], align 16
@d = external dso_local global [30010 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: mustprogress uwtable
declare dso_local noundef i32 @_Z3geti(i32 noundef) #1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z5mergeii(i32 noundef %0, i32 noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = call noundef i32 @_Z3geti(i32 noundef %8)
  store i32 %9, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %10 = load i32, ptr %4, align 4, !tbaa !5
  %11 = call noundef i32 @_Z3geti(i32 noundef %10)
  store i32 %11, ptr %6, align 4, !tbaa !5
  %12 = load i32, ptr %5, align 4, !tbaa !5
  %13 = load i32, ptr %6, align 4, !tbaa !5
  %14 = icmp eq i32 %12, %13
  br i1 %14, label %15, label %16

15:                                               ; preds = %2
  store i32 1, ptr %7, align 4
  br label %37

16:                                               ; preds = %2
  %17 = load i32, ptr %6, align 4, !tbaa !5
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [30010 x i32], ptr @fa, i64 0, i64 %19
  store i32 %17, ptr %20, align 4, !tbaa !5
  %21 = load i32, ptr %6, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [30010 x i32], ptr @sz, 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 [30010 x i32], ptr @d, i64 0, i64 %26
  store i32 %24, ptr %27, align 4, !tbaa !5
  %28 = load i32, ptr %5, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [30010 x i32], ptr @sz, i64 0, i64 %29
  %31 = load i32, ptr %30, align 4, !tbaa !5
  %32 = load i32, ptr %6, align 4, !tbaa !5
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds [30010 x i32], ptr @sz, i64 0, i64 %33
  %35 = load i32, ptr %34, align 4, !tbaa !5
  %36 = add nsw i32 %35, %31
  store i32 %36, ptr %34, align 4, !tbaa !5
  store i32 0, ptr %7, align 4
  br label %37

37:                                               ; preds = %16, %15
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  %38 = load i32, ptr %7, align 4
  switch i32 %38, label %40 [
    i32 0, label %39
    i32 1, label %39
  ]

39:                                               ; preds = %37, %37
  ret void

40:                                               ; preds = %37
  unreachable
}

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


; 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"

@fa = external dso_local local_unnamed_addr global [30010 x i32], align 16
@sz = external dso_local local_unnamed_addr global [30010 x i32], align 16
@d = external dso_local local_unnamed_addr global [30010 x i32], align 16

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z3geti(i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z5mergeii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = tail call noundef i32 @_Z3geti(i32 noundef %0)
  %4 = tail call noundef i32 @_Z3geti(i32 noundef %1)
  %5 = icmp eq i32 %3, %4
  br i1 %5, label %16, label %6

6:                                                ; preds = %2
  %7 = sext i32 %3 to i64
  %8 = getelementptr inbounds [30010 x i32], ptr @fa, i64 0, i64 %7
  store i32 %4, ptr %8, align 4, !tbaa !5
  %9 = sext i32 %4 to i64
  %10 = getelementptr inbounds [30010 x i32], ptr @sz, i64 0, i64 %9
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %12 = getelementptr inbounds [30010 x i32], ptr @d, i64 0, i64 %7
  store i32 %11, ptr %12, align 4, !tbaa !5
  %13 = getelementptr inbounds [30010 x i32], ptr @sz, i64 0, i64 %7
  %14 = load i32, ptr %13, align 4, !tbaa !5
  %15 = add nsw i32 %14, %11
  store i32 %15, ptr %10, align 4, !tbaa !5
  br label %16

16:                                               ; preds = %2, %6
  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,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass