; LLVM IR from lzyrapx/Competitive-Programming :: 51Nod/1242（斐波那契数列）（矩阵快速幂）.ll (Z5solvex)

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

@mat = external dso_local global %struct.Mat, align 8

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z3mul3MatS_(ptr dead_on_unwind noalias writable sret(%struct.Mat) align 8, ptr noundef byval(%struct.Mat) align 8, ptr noundef byval(%struct.Mat) align 8) #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 nounwind uwtable
define dso_local void @_Z5solvex(ptr dead_on_unwind noalias writable sret(%struct.Mat) align 8 %0, i64 noundef %1) #0 {
  %3 = alloca i64, align 8
  %4 = alloca %struct.Mat, align 8
  %5 = alloca %struct.Mat, align 8
  %6 = alloca %struct.Mat, align 8
  %7 = alloca %struct.Mat, align 8
  %8 = alloca %struct.Mat, align 8
  %9 = alloca %struct.Mat, align 8
  store i64 %1, ptr %3, align 8, !tbaa !5
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %0, ptr align 8 @mat, i64 32, i1 false), !tbaa.struct !9
  br label %10

10:                                               ; preds = %18, %2
  %11 = load i64, ptr %3, align 8, !tbaa !5
  %12 = icmp ne i64 %11, 0
  br i1 %12, label %13, label %21

13:                                               ; preds = %10
  %14 = load i64, ptr %3, align 8, !tbaa !5
  %15 = and i64 %14, 1
  %16 = icmp ne i64 %15, 0
  br i1 %16, label %17, label %18

17:                                               ; preds = %13
  call void @llvm.lifetime.start.p0(i64 32, ptr %4) #3
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %5, ptr align 8 @mat, i64 32, i1 false), !tbaa.struct !9
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %6, ptr align 8 %0, i64 32, i1 false), !tbaa.struct !9
  call void @_Z3mul3MatS_(ptr dead_on_unwind writable sret(%struct.Mat) align 8 %4, ptr noundef byval(%struct.Mat) align 8 %5, ptr noundef byval(%struct.Mat) align 8 %6)
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %0, ptr align 8 %4, i64 32, i1 false), !tbaa.struct !9
  call void @llvm.lifetime.end.p0(i64 32, ptr %4) #3
  br label %18

18:                                               ; preds = %17, %13
  call void @llvm.lifetime.start.p0(i64 32, ptr %7) #3
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %8, ptr align 8 @mat, i64 32, i1 false), !tbaa.struct !9
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %9, ptr align 8 @mat, i64 32, i1 false), !tbaa.struct !9
  call void @_Z3mul3MatS_(ptr dead_on_unwind writable sret(%struct.Mat) align 8 %7, ptr noundef byval(%struct.Mat) align 8 %8, ptr noundef byval(%struct.Mat) align 8 %9)
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 @mat, ptr align 8 %7, i64 32, i1 false), !tbaa.struct !9
  call void @llvm.lifetime.end.p0(i64 32, ptr %7) #3
  %19 = load i64, ptr %3, align 8, !tbaa !5
  %20 = ashr i64 %19, 1
  store i64 %20, ptr %3, align 8, !tbaa !5
  br label %10, !llvm.loop !11

21:                                               ; preds = %10
  ret void
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2

attributes #0 = { mustprogress nounwind 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 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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"}
!9 = !{i64 0, i64 32, !10}
!10 = !{!7, !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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

@mat = external dso_local local_unnamed_addr global %struct.Mat, align 8

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z3mul3MatS_(ptr dead_on_unwind noalias writable sret(%struct.Mat) align 8, ptr noundef byval(%struct.Mat) align 8, ptr noundef byval(%struct.Mat) align 8) 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 nounwind uwtable
define dso_local void @_Z5solvex(ptr dead_on_unwind noalias nocapture writable sret(%struct.Mat) align 8 %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = alloca %struct.Mat, align 8
  %4 = alloca %struct.Mat, align 8
  tail call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 8 dereferenceable(32) %0, ptr noundef nonnull align 8 dereferenceable(32) @mat, i64 32, i1 false), !tbaa.struct !5
  %.not4 = icmp eq i64 %1, 0
  br i1 %.not4, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %7
  %.05 = phi i64 [ %8, %7 ], [ %1, %2 ]
  %5 = and i64 %.05, 1
  %.not3 = icmp eq i64 %5, 0
  br i1 %.not3, label %7, label %6

6:                                                ; preds = %.lr.ph
  call void @llvm.lifetime.start.p0(i64 32, ptr nonnull %3) #3
  call void @_Z3mul3MatS_(ptr dead_on_unwind nonnull writable sret(%struct.Mat) align 8 %3, ptr noundef nonnull byval(%struct.Mat) align 8 @mat, ptr noundef nonnull byval(%struct.Mat) align 8 %0)
  call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 8 dereferenceable(32) %0, ptr noundef nonnull align 8 dereferenceable(32) %3, i64 32, i1 false), !tbaa.struct !5
  call void @llvm.lifetime.end.p0(i64 32, ptr nonnull %3) #3
  br label %7

7:                                                ; preds = %6, %.lr.ph
  call void @llvm.lifetime.start.p0(i64 32, ptr nonnull %4) #3
  call void @_Z3mul3MatS_(ptr dead_on_unwind nonnull writable sret(%struct.Mat) align 8 %4, ptr noundef nonnull byval(%struct.Mat) align 8 @mat, ptr noundef nonnull byval(%struct.Mat) align 8 @mat)
  call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 8 dereferenceable(32) @mat, ptr noundef nonnull align 8 dereferenceable(32) %4, i64 32, i1 false), !tbaa.struct !5
  call void @llvm.lifetime.end.p0(i64 32, ptr nonnull %4) #3
  %8 = ashr i64 %.05, 1
  %.not = icmp ult i64 %.05, 2
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %7, %2
  ret void
}

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2

attributes #0 = { mustprogress nounwind 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 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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 = !{i64 0, i64 32, !6}
!6 = !{!7, !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: DSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,MemCpyOptPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass