; LLVM IR from lzyrapx/Competitive-Programming :: ACdream/1116（扩展KMP+矩阵快速幂）.ll (Z3fibi)

; 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.matrix = type { [2 x [2 x i64]] }

@M = external dso_local global %struct.matrix, align 8

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z6qpoweri(ptr dead_on_unwind noalias writable sret(%struct.matrix) align 8, i32 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 noundef i32 @_Z3fibi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca %struct.matrix, align 8
  %6 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i64 0, ptr @M, align 8, !tbaa !9
  store i64 1, ptr getelementptr inbounds ([2 x i64], ptr @M, i64 0, i64 1), align 8, !tbaa !9
  store i64 1, ptr getelementptr inbounds ([2 x [2 x i64]], ptr @M, i64 0, i64 1), align 8, !tbaa !9
  store i64 1, ptr getelementptr inbounds ([2 x i64], ptr getelementptr inbounds ([2 x [2 x i64]], ptr @M, i64 0, i64 1), i64 0, i64 1), align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %7 = load i32, ptr %3, align 4, !tbaa !5
  %8 = sub nsw i32 %7, 1
  store i32 %8, ptr %4, align 4, !tbaa !5
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = icmp sgt i32 %9, 0
  br i1 %10, label %11, label %18

11:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 32, ptr %5) #2
  %12 = load i32, ptr %4, align 4, !tbaa !5
  call void @_Z6qpoweri(ptr dead_on_unwind writable sret(%struct.matrix) align 8 %5, i32 noundef %12)
  %13 = getelementptr inbounds %struct.matrix, ptr %5, i32 0, i32 0
  %14 = getelementptr inbounds [2 x [2 x i64]], ptr %13, i64 0, i64 1
  %15 = getelementptr inbounds [2 x i64], ptr %14, i64 0, i64 1
  %16 = load i64, ptr %15, align 8, !tbaa !9
  %17 = trunc i64 %16 to i32
  store i32 %17, ptr %2, align 4
  store i32 1, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 32, ptr %5) #2
  br label %29

18:                                               ; preds = %1
  %19 = load i32, ptr %4, align 4, !tbaa !5
  %20 = icmp eq i32 %19, -1
  br i1 %20, label %21, label %22

21:                                               ; preds = %18
  store i32 0, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %29

22:                                               ; preds = %18
  %23 = load i32, ptr %4, align 4, !tbaa !5
  %24 = icmp eq i32 %23, 0
  br i1 %24, label %25, label %26

25:                                               ; preds = %22
  store i32 1, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %29

26:                                               ; preds = %22
  br label %27

27:                                               ; preds = %26
  br label %28

28:                                               ; preds = %27
  unreachable

29:                                               ; preds = %25, %21, %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %30 = load i32, ptr %2, align 4
  ret i32 %30
}

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}


; 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.matrix = type { [2 x [2 x i64]] }

@M = external dso_local local_unnamed_addr global %struct.matrix, align 8

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z6qpoweri(ptr dead_on_unwind noalias writable sret(%struct.matrix) align 8, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress 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 noundef i32 @_Z3fibi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = alloca %struct.matrix, align 8
  store i64 0, ptr @M, align 8, !tbaa !5
  store i64 1, ptr getelementptr inbounds (i8, ptr @M, i64 8), align 8, !tbaa !5
  store i64 1, ptr getelementptr inbounds (i8, ptr @M, i64 16), align 8, !tbaa !5
  store i64 1, ptr getelementptr inbounds (i8, ptr @M, i64 24), align 8, !tbaa !5
  %3 = icmp sgt i32 %0, 1
  br i1 %3, label %4, label %9

4:                                                ; preds = %1
  %5 = add nsw i32 %0, -1
  call void @llvm.lifetime.start.p0(i64 32, ptr nonnull %2) #2
  call void @_Z6qpoweri(ptr dead_on_unwind nonnull writable sret(%struct.matrix) align 8 %2, i32 noundef %5)
  %6 = getelementptr inbounds i8, ptr %2, i64 24
  %7 = load i64, ptr %6, align 8, !tbaa !5
  %8 = trunc i64 %7 to i32
  call void @llvm.lifetime.end.p0(i64 32, ptr nonnull %2) #2
  br label %11

9:                                                ; preds = %1
  %10 = icmp ne i32 %0, 0
  %spec.select = zext i1 %10 to i32
  br label %11

11:                                               ; preds = %9, %4
  %.0 = phi i32 [ %8, %4 ], [ %spec.select, %9 ]
  ret i32 %.0
}

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 = { mustprogress 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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


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