; LLVM IR from VastoLorde95/Competitive-Programming :: Hackerrank/Company Contests/Walmart Algo 2016/Problem F/F.ll (Z6getfibx)

; 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"

@m = external dso_local global [3 x [3 x i64]], align 16

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z4fastx(i64 noundef) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z6getfibx(i64 noundef %0) #0 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  store i64 %0, ptr %3, align 8, !tbaa !5
  %4 = load i64, ptr %3, align 8, !tbaa !5
  %5 = sub nsw i64 %4, 1
  store i64 %5, ptr %3, align 8, !tbaa !5
  %6 = load i64, ptr %3, align 8, !tbaa !5
  %7 = icmp eq i64 %6, -2
  br i1 %7, label %8, label %9

8:                                                ; preds = %1
  store i64 1, ptr %2, align 8
  br label %20

9:                                                ; preds = %1
  %10 = load i64, ptr %3, align 8, !tbaa !5
  %11 = icmp eq i64 %10, -1
  br i1 %11, label %12, label %13

12:                                               ; preds = %9
  store i64 0, ptr %2, align 8
  br label %20

13:                                               ; preds = %9
  %14 = load i64, ptr %3, align 8, !tbaa !5
  %15 = icmp sle i64 %14, 1
  br i1 %15, label %16, label %17

16:                                               ; preds = %13
  store i64 1, ptr %2, align 8
  br label %20

17:                                               ; preds = %13
  store i64 1, ptr getelementptr inbounds ([3 x i64], ptr getelementptr inbounds ([3 x [3 x i64]], ptr @m, i64 0, i64 1), i64 0, i64 1), align 8, !tbaa !5
  store i64 1, ptr getelementptr inbounds ([3 x i64], ptr getelementptr inbounds ([3 x [3 x i64]], ptr @m, i64 0, i64 1), i64 0, i64 2), align 8, !tbaa !5
  store i64 1, ptr getelementptr inbounds ([3 x i64], ptr getelementptr inbounds ([3 x [3 x i64]], ptr @m, i64 0, i64 2), i64 0, i64 1), align 8, !tbaa !5
  store i64 0, ptr getelementptr inbounds ([3 x i64], ptr getelementptr inbounds ([3 x [3 x i64]], ptr @m, i64 0, i64 2), i64 0, i64 2), align 16, !tbaa !5
  %18 = load i64, ptr %3, align 8, !tbaa !5
  call void @_Z4fastx(i64 noundef %18)
  %19 = load i64, ptr getelementptr inbounds ([3 x i64], ptr getelementptr inbounds ([3 x [3 x i64]], ptr @m, i64 0, i64 1), i64 0, i64 1), align 8, !tbaa !5
  store i64 %19, ptr %2, align 8
  br label %20

20:                                               ; preds = %17, %16, %12, %8
  %21 = load i64, ptr %2, align 8
  ret i64 %21
}

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


; 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"

@m = external dso_local local_unnamed_addr global [3 x [3 x i64]], align 16

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z4fastx(i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z6getfibx(i64 noundef %0) local_unnamed_addr #0 {
  %2 = add nsw i64 %0, -1
  %3 = icmp eq i64 %2, -2
  br i1 %3, label %10, label %4

4:                                                ; preds = %1
  %5 = icmp eq i64 %0, 0
  br i1 %5, label %10, label %6

6:                                                ; preds = %4
  %7 = icmp slt i64 %0, 3
  br i1 %7, label %10, label %8

8:                                                ; preds = %6
  store i64 1, ptr getelementptr inbounds (i8, ptr @m, i64 32), align 16, !tbaa !5
  store i64 1, ptr getelementptr inbounds (i8, ptr @m, i64 40), align 8, !tbaa !5
  store i64 1, ptr getelementptr inbounds (i8, ptr @m, i64 56), align 8, !tbaa !5
  store i64 0, ptr getelementptr inbounds (i8, ptr @m, i64 64), align 16, !tbaa !5
  tail call void @_Z4fastx(i64 noundef %2)
  %9 = load i64, ptr getelementptr inbounds (i8, ptr @m, i64 32), align 16, !tbaa !5
  br label %10

10:                                               ; preds = %6, %4, %1, %8
  %.0 = phi i64 [ %9, %8 ], [ 1, %1 ], [ 0, %4 ], [ 1, %6 ]
  ret i64 %.0
}

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


; Effective O3 passes: GlobalOptPass,InferAlignmentPass,InstCombinePass,SROAPass,SimplifyCFGPass,TailCallElimPass