; LLVM IR from MakeContributions/DSA :: algorithms/C/maths/fibonacci-number/src (fib)

; 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"

@memomized_fib = external dso_local global [30 x i32], align 16

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local void @memomizing_fib() #1 {
  %1 = alloca i32, align 4
  store i32 0, ptr @memomized_fib, align 16, !tbaa !5
  store i32 1, ptr getelementptr inbounds ([30 x i32], ptr @memomized_fib, i64 0, i64 1), align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #2
  store i32 2, ptr %1, align 4, !tbaa !5
  br label %2

2:                                                ; preds = %21, %0
  %3 = load i32, ptr %1, align 4, !tbaa !5
  %4 = icmp slt i32 %3, 30
  br i1 %4, label %6, label %5

5:                                                ; preds = %2
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #2
  br label %24

6:                                                ; preds = %2
  %7 = load i32, ptr %1, align 4, !tbaa !5
  %8 = sub nsw i32 %7, 1
  %9 = sext i32 %8 to i64
  %10 = getelementptr inbounds [30 x i32], ptr @memomized_fib, i64 0, i64 %9
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %12 = load i32, ptr %1, align 4, !tbaa !5
  %13 = sub nsw i32 %12, 2
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [30 x i32], ptr @memomized_fib, i64 0, i64 %14
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %17 = add nsw i32 %11, %16
  %18 = load i32, ptr %1, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [30 x i32], ptr @memomized_fib, i64 0, i64 %19
  store i32 %17, ptr %20, align 4, !tbaa !5
  br label %21

21:                                               ; preds = %6
  %22 = load i32, ptr %1, align 4, !tbaa !5
  %23 = add nsw i32 %22, 1
  store i32 %23, ptr %1, align 4, !tbaa !5
  br label %2, !llvm.loop !9

24:                                               ; preds = %5
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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"

@memomized_fib = external dso_local local_unnamed_addr global [30 x i32], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(write, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @memomizing_fib() local_unnamed_addr #0 {
  store <4 x i32> <i32 0, i32 1, i32 1, i32 2>, ptr @memomized_fib, align 16, !tbaa !5
  store <4 x i32> <i32 3, i32 5, i32 8, i32 13>, ptr getelementptr inbounds (i8, ptr @memomized_fib, i64 16), align 16, !tbaa !5
  store <4 x i32> <i32 21, i32 34, i32 55, i32 89>, ptr getelementptr inbounds (i8, ptr @memomized_fib, i64 32), align 16, !tbaa !5
  store <4 x i32> <i32 144, i32 233, i32 377, i32 610>, ptr getelementptr inbounds (i8, ptr @memomized_fib, i64 48), align 16, !tbaa !5
  store <4 x i32> <i32 987, i32 1597, i32 2584, i32 4181>, ptr getelementptr inbounds (i8, ptr @memomized_fib, i64 64), align 16, !tbaa !5
  store <4 x i32> <i32 6765, i32 10946, i32 17711, i32 28657>, ptr getelementptr inbounds (i8, ptr @memomized_fib, i64 80), align 16, !tbaa !5
  store <4 x i32> <i32 46368, i32 75025, i32 121393, i32 196418>, ptr getelementptr inbounds (i8, ptr @memomized_fib, i64 96), align 16, !tbaa !5
  store i32 317811, ptr getelementptr inbounds (i8, ptr @memomized_fib, i64 112), align 16, !tbaa !5
  store i32 514229, ptr getelementptr inbounds (i8, ptr @memomized_fib, i64 116), align 4, !tbaa !5
  ret void
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(write, argmem: none, inaccessiblemem: none) 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; Effective O3 passes: GVNPass,GlobalOptPass,IndVarSimplifyPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,PostOrderFunctionAttrsPass,ReassociatePass,SLPVectorizerPass,SROAPass,SimplifyCFGPass