; LLVM IR from DimitrisJim/leetcode_solutions :: C/Algorithms (1414)

; 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"

@fibs = external hidden global [45 x i32], align 16

; Function Attrs: nounwind uwtable
define dso_local i32 @findMinFibonacciNumbers(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 45, ptr %5, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %25, %1
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = icmp ne i32 %8, 0
  br i1 %9, label %10, label %34

10:                                               ; preds = %7
  br label %11

11:                                               ; preds = %24, %10
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = load i32, ptr %5, align 4, !tbaa !5
  %14 = add nsw i32 %13, -1
  store i32 %14, ptr %5, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [45 x i32], ptr @fibs, i64 0, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = icmp slt i32 %12, %17
  br i1 %18, label %19, label %25

19:                                               ; preds = %11
  %20 = load i32, ptr %5, align 4, !tbaa !5
  %21 = icmp eq i32 %20, -1
  br i1 %21, label %22, label %24

22:                                               ; preds = %19
  %23 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %23, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %36

24:                                               ; preds = %19
  br label %11, !llvm.loop !9

25:                                               ; preds = %11
  %26 = load i32, ptr %5, align 4, !tbaa !5
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds [45 x i32], ptr @fibs, i64 0, i64 %27
  %29 = load i32, ptr %28, align 4, !tbaa !5
  %30 = load i32, ptr %3, align 4, !tbaa !5
  %31 = sub nsw i32 %30, %29
  store i32 %31, ptr %3, align 4, !tbaa !5
  %32 = load i32, ptr %4, align 4, !tbaa !5
  %33 = add nsw i32 %32, 1
  store i32 %33, ptr %4, align 4, !tbaa !5
  br label %7, !llvm.loop !11

34:                                               ; preds = %7
  %35 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %35, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %36

36:                                               ; preds = %34, %22
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %37 = load i32, ptr %2, align 4
  ret i32 %37
}

; 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

attributes #0 = { 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 = { 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"}
!11 = distinct !{!11, !10}


; 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"

@fibs = external hidden local_unnamed_addr global [45 x i32], align 16

; Function Attrs: nofree norecurse nosync nounwind memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local i32 @findMinFibonacciNumbers(i32 noundef %0) local_unnamed_addr #0 {
  %.not21 = icmp eq i32 %0, 0
  br i1 %.not21, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %1, %9
  %.024 = phi i64 [ %indvars.iv.next, %9 ], [ 45, %1 ]
  %.01023 = phi i32 [ %11, %9 ], [ 0, %1 ]
  %.01122 = phi i32 [ %10, %9 ], [ %0, %1 ]
  %sext = shl i64 %.024, 32
  %2 = ashr exact i64 %sext, 32
  br label %3

3:                                                ; preds = %.preheader, %7
  %indvars.iv = phi i64 [ %2, %.preheader ], [ %indvars.iv.next, %7 ]
  %indvars.iv.next = add nsw i64 %indvars.iv, -1
  %4 = getelementptr inbounds [45 x i32], ptr @fibs, i64 0, i64 %indvars.iv.next
  %5 = load i32, ptr %4, align 4, !tbaa !5
  %6 = icmp slt i32 %.01122, %5
  br i1 %6, label %7, label %9

7:                                                ; preds = %3
  %8 = icmp eq i64 %indvars.iv, 0
  br i1 %8, label %.loopexit, label %3, !llvm.loop !9

9:                                                ; preds = %3
  %10 = sub nsw i32 %.01122, %5
  %11 = add nuw nsw i32 %.01023, 1
  %.not = icmp eq i32 %10, 0
  br i1 %.not, label %.loopexit, label %.preheader, !llvm.loop !11

.loopexit:                                        ; preds = %9, %7, %1
  %.01020 = phi i32 [ 0, %1 ], [ %.01023, %7 ], [ %11, %9 ]
  ret i32 %.01020
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, 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"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass