; 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 (Z6changeiix)

; 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: 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

; Function Attrs: mustprogress uwtable
define dso_local void @_Z6changeiix(i32 noundef %0, i32 noundef %1, i64 noundef %2) #0 {
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i64, align 8
  %7 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  store i64 %2, ptr %6, align 8, !tbaa !9
  %8 = load i32, ptr %4, align 4, !tbaa !5
  %9 = sext i32 %8 to i64
  %10 = getelementptr inbounds [2000040 x %struct.SegmentTree], ptr @t, i64 0, i64 %9
  %11 = getelementptr inbounds %struct.SegmentTree, ptr %10, i32 0, i32 0
  %12 = load i32, ptr %11, align 16, !tbaa !11
  %13 = load i32, ptr %4, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [2000040 x %struct.SegmentTree], ptr @t, i64 0, i64 %14
  %16 = getelementptr inbounds %struct.SegmentTree, ptr %15, i32 0, i32 1
  %17 = load i32, ptr %16, align 4, !tbaa !13
  %18 = icmp eq i32 %12, %17
  br i1 %18, label %19, label %28

19:                                               ; preds = %3
  %20 = load i64, ptr %6, align 8, !tbaa !9
  %21 = load i32, ptr %5, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [500010 x i64], ptr @b, i64 0, i64 %22
  store i64 %20, ptr %23, align 8, !tbaa !9
  %24 = load i32, ptr %4, align 4, !tbaa !5
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds [2000040 x %struct.SegmentTree], ptr @t, i64 0, i64 %25
  %27 = getelementptr inbounds %struct.SegmentTree, ptr %26, i32 0, i32 2
  store i64 %20, ptr %27, align 8, !tbaa !14
  br label %74

28:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %29 = load i32, ptr %4, align 4, !tbaa !5
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds [2000040 x %struct.SegmentTree], ptr @t, i64 0, i64 %30
  %32 = getelementptr inbounds %struct.SegmentTree, ptr %31, i32 0, i32 0
  %33 = load i32, ptr %32, align 16, !tbaa !11
  %34 = load i32, ptr %4, align 4, !tbaa !5
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds [2000040 x %struct.SegmentTree], ptr @t, i64 0, i64 %35
  %37 = getelementptr inbounds %struct.SegmentTree, ptr %36, i32 0, i32 1
  %38 = load i32, ptr %37, align 4, !tbaa !13
  %39 = add nsw i32 %33, %38
  %40 = ashr i32 %39, 1
  store i32 %40, ptr %7, align 4, !tbaa !5
  %41 = load i32, ptr %5, align 4, !tbaa !5
  %42 = load i32, ptr %7, align 4, !tbaa !5
  %43 = icmp sle i32 %41, %42
  br i1 %43, label %44, label %49

44:                                               ; preds = %28
  %45 = load i32, ptr %4, align 4, !tbaa !5
  %46 = mul nsw i32 2, %45
  %47 = load i32, ptr %5, align 4, !tbaa !5
  %48 = load i64, ptr %6, align 8, !tbaa !9
  call void @_Z6changeiix(i32 noundef %46, i32 noundef %47, i64 noundef %48)
  br label %55

49:                                               ; preds = %28
  %50 = load i32, ptr %4, align 4, !tbaa !5
  %51 = mul nsw i32 2, %50
  %52 = add nsw i32 %51, 1
  %53 = load i32, ptr %5, align 4, !tbaa !5
  %54 = load i64, ptr %6, align 8, !tbaa !9
  call void @_Z6changeiix(i32 noundef %52, i32 noundef %53, i64 noundef %54)
  br label %55

55:                                               ; preds = %49, %44
  %56 = load i32, ptr %4, align 4, !tbaa !5
  %57 = mul nsw i32 2, %56
  %58 = sext i32 %57 to i64
  %59 = getelementptr inbounds [2000040 x %struct.SegmentTree], ptr @t, i64 0, i64 %58
  %60 = getelementptr inbounds %struct.SegmentTree, ptr %59, i32 0, i32 2
  %61 = load i64, ptr %60, align 8, !tbaa !14
  %62 = load i32, ptr %4, align 4, !tbaa !5
  %63 = mul nsw i32 2, %62
  %64 = add nsw i32 %63, 1
  %65 = sext i32 %64 to i64
  %66 = getelementptr inbounds [2000040 x %struct.SegmentTree], ptr @t, i64 0, i64 %65
  %67 = getelementptr inbounds %struct.SegmentTree, ptr %66, i32 0, i32 2
  %68 = load i64, ptr %67, align 8, !tbaa !14
  %69 = call noundef i64 @_Z3gcdxx(i64 noundef %61, i64 noundef %68)
  %70 = load i32, ptr %4, align 4, !tbaa !5
  %71 = sext i32 %70 to i64
  %72 = getelementptr inbounds [2000040 x %struct.SegmentTree], ptr @t, i64 0, i64 %71
  %73 = getelementptr inbounds %struct.SegmentTree, ptr %72, i32 0, i32 2
  store i64 %69, ptr %73, align 8, !tbaa !14
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  br label %74

74:                                               ; preds = %55, %19
  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" }
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, !10, i64 0}
!10 = !{!"long long", !7, i64 0}
!11 = !{!12, !6, i64 0}
!12 = !{!"_ZTS11SegmentTree", !6, i64 0, !6, i64 4, !10, i64 8}
!13 = !{!12, !6, i64 4}
!14 = !{!12, !10, 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 @_Z6changeiix(i32 noundef %0, i32 noundef %1, i64 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
  %6 = load i32, ptr %5, align 16, !tbaa !5
  %7 = getelementptr inbounds i8, ptr %5, i64 4
  %8 = load i32, ptr %7, align 4, !tbaa !11
  %9 = icmp eq i32 %6, %8
  br i1 %9, label %10, label %13

10:                                               ; preds = %3
  %11 = sext i32 %1 to i64
  %12 = getelementptr inbounds [500010 x i64], ptr @b, i64 0, i64 %11
  store i64 %2, ptr %12, align 8, !tbaa !12
  br label %28

13:                                               ; preds = %3
  %14 = add nsw i32 %8, %6
  %15 = ashr i32 %14, 1
  %.not = icmp slt i32 %15, %1
  %16 = shl nsw i32 %0, 1
  br i1 %.not, label %18, label %17

17:                                               ; preds = %13
  tail call void @_Z6changeiix(i32 noundef %16, i32 noundef %1, i64 noundef %2)
  %.pre = or disjoint i32 %16, 1
  br label %20

18:                                               ; preds = %13
  %19 = or disjoint i32 %16, 1
  tail call void @_Z6changeiix(i32 noundef %19, i32 noundef %1, i64 noundef %2)
  br label %20

20:                                               ; preds = %18, %17
  %.pre-phi20 = phi i32 [ %19, %18 ], [ %.pre, %17 ]
  %21 = sext i32 %16 to i64
  %22 = getelementptr inbounds [2000040 x %struct.SegmentTree], ptr @t, i64 0, i64 %21, i32 2
  %23 = load i64, ptr %22, align 8, !tbaa !13
  %24 = sext i32 %.pre-phi20 to i64
  %25 = getelementptr inbounds [2000040 x %struct.SegmentTree], ptr @t, i64 0, i64 %24, i32 2
  %26 = load i64, ptr %25, align 8, !tbaa !13
  %27 = tail call noundef i64 @_Z3gcdxx(i64 noundef %23, i64 noundef %26)
  br label %28

28:                                               ; preds = %20, %10
  %.sink = phi i64 [ %27, %20 ], [ %2, %10 ]
  %29 = getelementptr inbounds i8, ptr %5, i64 8
  store i64 %.sink, ptr %29, align 8, !tbaa !13
  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, !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,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass