; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 01. Mathematics/fibonacci matrix.ll (Z6matpowPA2_xxS0_)

; 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"

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z3mulPA2_xS0_(ptr noundef, ptr noundef) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z6matpowPA2_xxS0_(ptr noundef %0, i64 noundef %1, ptr noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca i64, align 8
  %6 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i64 %1, ptr %5, align 8, !tbaa !9
  store ptr %2, ptr %6, align 8, !tbaa !5
  br label %7

7:                                                ; preds = %17, %3
  %8 = load i64, ptr %5, align 8, !tbaa !9
  %9 = icmp sgt i64 %8, 0
  br i1 %9, label %10, label %22

10:                                               ; preds = %7
  %11 = load i64, ptr %5, align 8, !tbaa !9
  %12 = and i64 %11, 1
  %13 = icmp ne i64 %12, 0
  br i1 %13, label %14, label %17

14:                                               ; preds = %10
  %15 = load ptr, ptr %6, align 8, !tbaa !5
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  call void @_Z3mulPA2_xS0_(ptr noundef %15, ptr noundef %16)
  br label %17

17:                                               ; preds = %14, %10
  %18 = load ptr, ptr %4, align 8, !tbaa !5
  %19 = load ptr, ptr %4, align 8, !tbaa !5
  call void @_Z3mulPA2_xS0_(ptr noundef %18, ptr noundef %19)
  %20 = load i64, ptr %5, align 8, !tbaa !9
  %21 = ashr i64 %20, 1
  store i64 %21, ptr %5, align 8, !tbaa !9
  br label %7, !llvm.loop !11

22:                                               ; preds = %7
  ret void
}

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" }

!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 = !{!"any pointer", !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 = 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"

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z3mulPA2_xS0_(ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z6matpowPA2_xxS0_(ptr noundef %0, i64 noundef %1, ptr noundef %2) local_unnamed_addr #0 {
  %4 = icmp sgt i64 %1, 0
  br i1 %4, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %3, %7
  %.06 = phi i64 [ %8, %7 ], [ %1, %3 ]
  %5 = and i64 %.06, 1
  %.not = icmp eq i64 %5, 0
  br i1 %.not, label %7, label %6

6:                                                ; preds = %.lr.ph
  tail call void @_Z3mulPA2_xS0_(ptr noundef %2, ptr noundef %0)
  br label %7

7:                                                ; preds = %6, %.lr.ph
  tail call void @_Z3mulPA2_xS0_(ptr noundef %0, ptr noundef %0)
  %8 = lshr i64 %.06, 1
  %.not7 = icmp ult i64 %.06, 2
  br i1 %.not7, label %._crit_edge, label %.lr.ph, !llvm.loop !5

._crit_edge:                                      ; preds = %7, %3
  ret void
}

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" }

!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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GlobalOptPass,IPSCCPPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass