; LLVM IR from PacktPublishing/CPP-Data-Structures-and-Algorithms :: Chapter05/Exponential_Search/main.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
  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
  %9 = load i32, ptr %6, align 4, !tbaa !9
  %10 = icmp sle i32 %9, 0
  br i1 %10, label %11, label %12

11:                                               ; preds = %3
  store i32 -1, ptr %4, align 4
  br label %38

12:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  store i32 1, ptr %8, align 4, !tbaa !9
  br label %13

13:                                               ; preds = %27, %12
  %14 = load i32, ptr %8, align 4, !tbaa !9
  %15 = load i32, ptr %6, align 4, !tbaa !9
  %16 = icmp slt i32 %14, %15
  br i1 %16, label %17, label %25

17:                                               ; preds = %13
  %18 = load ptr, ptr %5, align 8, !tbaa !5
  %19 = load i32, ptr %8, align 4, !tbaa !9
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds i32, ptr %18, i64 %20
  %22 = load i32, ptr %21, align 4, !tbaa !9
  %23 = load i32, ptr %7, align 4, !tbaa !9
  %24 = icmp slt i32 %22, %23
  br label %25

25:                                               ; preds = %17, %13
  %26 = phi i1 [ false, %13 ], [ %24, %17 ]
  br i1 %26, label %27, label %30

27:                                               ; preds = %25
  %28 = load i32, ptr %8, align 4, !tbaa !9
  %29 = mul nsw i32 %28, 2
  store i32 %29, ptr %8, align 4, !tbaa !9
  br label %13, !llvm.loop !11

30:                                               ; preds = %25
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = load i32, ptr %8, align 4, !tbaa !9
  %33 = sdiv i32 %32, 2
  %34 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %8, ptr noundef nonnull align 4 dereferenceable(4) %6)
  %35 = load i32, ptr %34, align 4, !tbaa !9
  %36 = load i32, ptr %7, align 4, !tbaa !9
  %37 = call noundef i32 @_Z12BinarySearchPiiii(ptr noundef %31, i32 noundef %33, i32 noundef %35, i32 noundef %36)
  store i32 %37, ptr %4, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  br label %38

38:                                               ; preds = %30, %11
  %39 = load i32, ptr %4, align 4
  ret i32 %39
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #2

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 = { inlinehint 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" }
attributes #3 = { 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 nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress 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) local_unnamed_addr #0 {
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %1, ptr %4, align 4, !tbaa !5
  %6 = icmp slt i32 %1, 1
  br i1 %6, label %19, label %7

7:                                                ; preds = %3
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %5) #3
  %.not = icmp eq i32 %1, 1
  br i1 %.not, label %.critedge, label %.lr.ph

.lr.ph:                                           ; preds = %7, %12
  %storemerge6 = phi i32 [ %13, %12 ], [ 1, %7 ]
  %8 = zext nneg i32 %storemerge6 to i64
  %9 = getelementptr inbounds i32, ptr %0, i64 %8
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %11 = icmp slt i32 %10, %2
  br i1 %11, label %12, label %.critedge

12:                                               ; preds = %.lr.ph
  %13 = shl nsw i32 %storemerge6, 1
  %14 = icmp slt i32 %13, %1
  br i1 %14, label %.lr.ph, label %.critedge, !llvm.loop !9

.critedge:                                        ; preds = %.lr.ph, %12, %7
  %storemerge.lcssa5 = phi i32 [ 1, %7 ], [ %13, %12 ], [ %storemerge6, %.lr.ph ]
  store i32 %storemerge.lcssa5, ptr %5, align 4, !tbaa !5
  %15 = sdiv i32 %storemerge.lcssa5, 2
  %16 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %5, ptr noundef nonnull align 4 dereferenceable(4) %4)
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = call noundef i32 @_Z12BinarySearchPiiii(ptr noundef %0, i32 noundef %15, i32 noundef %17, i32 noundef %2)
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %5) #3
  br label %19

19:                                               ; preds = %3, %.critedge
  %.0 = phi i32 [ %18, %.critedge ], [ -1, %3 ]
  ret i32 %.0
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #2

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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { inlinehint 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" }
attributes #3 = { 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++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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