; LLVM IR from upupming/algorithm :: acwing/算法竞赛进阶指南/0x43-线段树/246. 区间最大公约数.ll (Z5buildiii)

; 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"

%struct.SegmentTree = type { i32, i32, i64 }

@b = external dso_local global [500010 x i64], align 16
@t = external dso_local global [2000040 x %struct.SegmentTree], align 16

; Function Attrs: mustprogress uwtable
declare dso_local noundef i64 @_Z3gcdxx(i64 noundef, i64 noundef) #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z5buildiii(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
  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
  %8 = load i32, ptr %5, align 4, !tbaa !5
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = sext i32 %9 to i64
  %11 = getelementptr inbounds [2000040 x %struct.SegmentTree], ptr @t, i64 0, i64 %10
  %12 = getelementptr inbounds %struct.SegmentTree, ptr %11, i32 0, i32 0
  store i32 %8, ptr %12, align 16, !tbaa !9
  %13 = load i32, ptr %6, align 4, !tbaa !5
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [2000040 x %struct.SegmentTree], ptr @t, i64 0, i64 %15
  %17 = getelementptr inbounds %struct.SegmentTree, ptr %16, i32 0, i32 1
  store i32 %13, ptr %17, align 4, !tbaa !12
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = load i32, ptr %6, align 4, !tbaa !5
  %20 = icmp eq i32 %18, %19
  br i1 %20, label %21, label %30

21:                                               ; preds = %3
  %22 = load i32, ptr %5, align 4, !tbaa !5
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds [500010 x i64], ptr @b, i64 0, i64 %23
  %25 = load i64, ptr %24, align 8, !tbaa !13
  %26 = load i32, ptr %4, align 4, !tbaa !5
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds [2000040 x %struct.SegmentTree], ptr @t, i64 0, i64 %27
  %29 = getelementptr inbounds %struct.SegmentTree, ptr %28, i32 0, i32 2
  store i64 %25, ptr %29, align 8, !tbaa !14
  br label %63

30:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %31 = load i32, ptr %5, align 4, !tbaa !5
  %32 = load i32, ptr %6, align 4, !tbaa !5
  %33 = add nsw i32 %31, %32
  %34 = ashr i32 %33, 1
  store i32 %34, ptr %7, align 4, !tbaa !5
  %35 = load i32, ptr %4, align 4, !tbaa !5
  %36 = mul nsw i32 2, %35
  %37 = load i32, ptr %5, align 4, !tbaa !5
  %38 = load i32, ptr %7, align 4, !tbaa !5
  call void @_Z5buildiii(i32 noundef %36, i32 noundef %37, i32 noundef %38)
  %39 = load i32, ptr %4, align 4, !tbaa !5
  %40 = mul nsw i32 2, %39
  %41 = add nsw i32 %40, 1
  %42 = load i32, ptr %7, align 4, !tbaa !5
  %43 = add nsw i32 %42, 1
  %44 = load i32, ptr %6, align 4, !tbaa !5
  call void @_Z5buildiii(i32 noundef %41, i32 noundef %43, i32 noundef %44)
  %45 = load i32, ptr %4, align 4, !tbaa !5
  %46 = mul nsw i32 2, %45
  %47 = sext i32 %46 to i64
  %48 = getelementptr inbounds [2000040 x %struct.SegmentTree], ptr @t, i64 0, i64 %47
  %49 = getelementptr inbounds %struct.SegmentTree, ptr %48, i32 0, i32 2
  %50 = load i64, ptr %49, align 8, !tbaa !14
  %51 = load i32, ptr %4, align 4, !tbaa !5
  %52 = mul nsw i32 2, %51
  %53 = add nsw i32 %52, 1
  %54 = sext i32 %53 to i64
  %55 = getelementptr inbounds [2000040 x %struct.SegmentTree], ptr @t, i64 0, i64 %54
  %56 = getelementptr inbounds %struct.SegmentTree, ptr %55, i32 0, i32 2
  %57 = load i64, ptr %56, align 8, !tbaa !14
  %58 = call noundef i64 @_Z3gcdxx(i64 noundef %50, i64 noundef %57)
  %59 = load i32, ptr %4, align 4, !tbaa !5
  %60 = sext i32 %59 to i64
  %61 = getelementptr inbounds [2000040 x %struct.SegmentTree], ptr @t, i64 0, i64 %60
  %62 = getelementptr inbounds %struct.SegmentTree, ptr %61, i32 0, i32 2
  store i64 %58, ptr %62, align 8, !tbaa !14
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  br label %63

63:                                               ; preds = %30, %21
  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 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 = !{!10, !6, i64 0}
!10 = !{!"_ZTS11SegmentTree", !6, i64 0, !6, i64 4, !11, i64 8}
!11 = !{!"long long", !7, i64 0}
!12 = !{!10, !6, i64 4}
!13 = !{!11, !11, i64 0}
!14 = !{!10, !11, i64 8}


; 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"

%struct.SegmentTree = type { i32, i32, i64 }

@b = external dso_local local_unnamed_addr global [500010 x i64], align 16
@t = external dso_local local_unnamed_addr global [2000040 x %struct.SegmentTree], align 16

; Function Attrs: mustprogress uwtable
declare dso_local noundef i64 @_Z3gcdxx(i64 noundef, i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z5buildiii(i32 noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = sext i32 %0 to i64
  %5 = getelementptr inbounds [2000040 x %struct.SegmentTree], ptr @t, i64 0, i64 %4
  store i32 %1, ptr %5, align 16, !tbaa !5
  %6 = getelementptr inbounds i8, ptr %5, i64 4
  store i32 %2, ptr %6, align 4, !tbaa !11
  %7 = icmp eq i32 %1, %2
  br i1 %7, label %8, label %13

8:                                                ; preds = %3
  %9 = sext i32 %1 to i64
  %10 = getelementptr inbounds [500010 x i64], ptr @b, i64 0, i64 %9
  %11 = load i64, ptr %10, align 8, !tbaa !12
  br label %common.ret

common.ret:                                       ; preds = %8, %13
  %.sink = phi i64 [ %11, %8 ], [ %25, %13 ]
  %12 = getelementptr inbounds i8, ptr %5, i64 8
  store i64 %.sink, ptr %12, align 8
  ret void

13:                                               ; preds = %3
  %14 = add nsw i32 %2, %1
  %15 = ashr i32 %14, 1
  %16 = shl nsw i32 %0, 1
  tail call void @_Z5buildiii(i32 noundef %16, i32 noundef %1, i32 noundef %15)
  %17 = or disjoint i32 %16, 1
  %18 = add nsw i32 %15, 1
  tail call void @_Z5buildiii(i32 noundef %17, i32 noundef %18, i32 noundef %2)
  %19 = sext i32 %16 to i64
  %20 = getelementptr inbounds [2000040 x %struct.SegmentTree], ptr @t, i64 0, i64 %19, i32 2
  %21 = load i64, ptr %20, align 8, !tbaa !13
  %22 = sext i32 %17 to i64
  %23 = getelementptr inbounds [2000040 x %struct.SegmentTree], ptr @t, i64 0, i64 %22, i32 2
  %24 = load i64, ptr %23, align 8, !tbaa !13
  %25 = tail call noundef i64 @_Z3gcdxx(i64 noundef %21, i64 noundef %24)
  br label %common.ret
}

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, !7, i64 0}
!6 = !{!"_ZTS11SegmentTree", !7, i64 0, !7, i64 4, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"long long", !8, i64 0}
!11 = !{!6, !7, i64 4}
!12 = !{!10, !10, i64 0}
!13 = !{!6, !10, i64 8}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,MergedLoadStoreMotionPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass