; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/search/exponential_search.ll (Z17ExponentialSearchPiii)

; 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 uwtable
declare dso_local noundef i32 @_Z12BinarySearchPiiii(ptr noundef, i32 noundef, i32 noundef, i32 noundef) #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 uwtable
define dso_local noundef i32 @_Z17ExponentialSearchPiii(ptr noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store i32 %2, ptr %7, align 4, !tbaa !9
  %10 = load ptr, ptr %5, align 8, !tbaa !5
  %11 = getelementptr inbounds i32, ptr %10, i64 0
  %12 = load i32, ptr %11, align 4, !tbaa !9
  %13 = load i32, ptr %7, align 4, !tbaa !9
  %14 = icmp eq i32 %12, %13
  br i1 %14, label %15, label %16

15:                                               ; preds = %3
  store i32 0, ptr %4, align 4
  br label %52

16:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  store i32 1, ptr %8, align 4, !tbaa !9
  br label %17

17:                                               ; preds = %31, %16
  %18 = load i32, ptr %8, align 4, !tbaa !9
  %19 = load i32, ptr %6, align 4, !tbaa !9
  %20 = icmp slt i32 %18, %19
  br i1 %20, label %21, label %29

21:                                               ; preds = %17
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = load i32, ptr %8, align 4, !tbaa !9
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds i32, ptr %22, i64 %24
  %26 = load i32, ptr %25, align 4, !tbaa !9
  %27 = load i32, ptr %7, align 4, !tbaa !9
  %28 = icmp sle i32 %26, %27
  br label %29

29:                                               ; preds = %21, %17
  %30 = phi i1 [ false, %17 ], [ %28, %21 ]
  br i1 %30, label %31, label %34

31:                                               ; preds = %29
  %32 = load i32, ptr %8, align 4, !tbaa !9
  %33 = mul nsw i32 %32, 2
  store i32 %33, ptr %8, align 4, !tbaa !9
  br label %17, !llvm.loop !11

34:                                               ; preds = %29
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %35 = load i32, ptr %8, align 4, !tbaa !9
  %36 = load i32, ptr %6, align 4, !tbaa !9
  %37 = sub nsw i32 %36, 1
  %38 = icmp slt i32 %35, %37
  br i1 %38, label %39, label %41

39:                                               ; preds = %34
  %40 = load i32, ptr %8, align 4, !tbaa !9
  br label %44

41:                                               ; preds = %34
  %42 = load i32, ptr %6, align 4, !tbaa !9
  %43 = sub nsw i32 %42, 1
  br label %44

44:                                               ; preds = %41, %39
  %45 = phi i32 [ %40, %39 ], [ %43, %41 ]
  store i32 %45, ptr %9, align 4, !tbaa !9
  %46 = load ptr, ptr %5, align 8, !tbaa !5
  %47 = load i32, ptr %8, align 4, !tbaa !9
  %48 = sdiv i32 %47, 2
  %49 = load i32, ptr %9, align 4, !tbaa !9
  %50 = load i32, ptr %7, align 4, !tbaa !9
  %51 = call noundef i32 @_Z12BinarySearchPiiii(ptr noundef %46, i32 noundef %48, i32 noundef %49, i32 noundef %50)
  store i32 %51, ptr %4, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  br label %52

52:                                               ; preds = %44, %15
  %53 = load i32, ptr %4, align 4
  ret i32 %53
}

attributes #0 = { mustprogress 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !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 uwtable
declare dso_local noundef i32 @_Z12BinarySearchPiiii(ptr noundef, i32 noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z17ExponentialSearchPiii(ptr noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = load i32, ptr %0, align 4, !tbaa !5
  %5 = icmp eq i32 %4, %2
  br i1 %5, label %17, label %.preheader

.preheader:                                       ; preds = %3
  %6 = icmp sgt i32 %1, 1
  br i1 %6, label %.lr.ph, label %.critedge

.lr.ph:                                           ; preds = %.preheader, %10
  %.01618 = phi i32 [ %11, %10 ], [ 1, %.preheader ]
  %7 = zext nneg i32 %.01618 to i64
  %8 = getelementptr inbounds i32, ptr %0, i64 %7
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %.not = icmp sgt i32 %9, %2
  br i1 %.not, label %.critedge, label %10

10:                                               ; preds = %.lr.ph
  %11 = shl nsw i32 %.01618, 1
  %12 = icmp slt i32 %11, %1
  br i1 %12, label %.lr.ph, label %.critedge, !llvm.loop !9

.critedge:                                        ; preds = %.lr.ph, %10, %.preheader
  %.016.lcssa = phi i32 [ 1, %.preheader ], [ %11, %10 ], [ %.01618, %.lr.ph ]
  %13 = add nsw i32 %1, -1
  %14 = tail call i32 @llvm.smin.i32(i32 %.016.lcssa, i32 %13)
  %15 = lshr i32 %.016.lcssa, 1
  %16 = tail call noundef i32 @_Z12BinarySearchPiiii(ptr noundef nonnull %0, i32 noundef %15, i32 noundef %14, i32 noundef %2)
  br label %17

17:                                               ; preds = %3, %.critedge
  %.0 = phi i32 [ %16, %.critedge ], [ 0, %3 ]
  ret i32 %.0
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smin.i32(i32, i32) #1

attributes #0 = { mustprogress 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 speculatable willreturn memory(none) }

!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++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass