; LLVM IR from DimitrisJim/leetcode_solutions :: C/Algorithms (868)

; 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: nounwind uwtable
define dso_local i32 @binaryGap(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
  %7 = load i32, ptr %3, align 4, !tbaa !5
  %8 = icmp sle i32 %7, 2
  br i1 %8, label %9, label %10

9:                                                ; preds = %1
  store i32 0, ptr %2, align 4
  br label %37

10:                                               ; preds = %1
  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 0, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !5
  br label %11

11:                                               ; preds = %32, %10
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = icmp ne i32 %12, 0
  br i1 %13, label %14, label %35

14:                                               ; preds = %11
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = and i32 %15, 1
  %17 = icmp ne i32 %16, 0
  br i1 %17, label %18, label %25

18:                                               ; preds = %14
  %19 = load i32, ptr %4, align 4, !tbaa !5
  %20 = load i32, ptr %5, align 4, !tbaa !5
  %21 = icmp sge i32 %19, %20
  br i1 %21, label %22, label %24

22:                                               ; preds = %18
  %23 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %23, ptr %5, align 4, !tbaa !5
  br label %24

24:                                               ; preds = %22, %18
  store i32 1, ptr %4, align 4, !tbaa !5
  store i32 1, ptr %6, align 4, !tbaa !5
  br label %32

25:                                               ; preds = %14
  %26 = load i32, ptr %6, align 4, !tbaa !5
  %27 = icmp ne i32 %26, 0
  br i1 %27, label %28, label %31

28:                                               ; preds = %25
  %29 = load i32, ptr %4, align 4, !tbaa !5
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr %4, align 4, !tbaa !5
  br label %31

31:                                               ; preds = %28, %25
  br label %32

32:                                               ; preds = %31, %24
  %33 = load i32, ptr %3, align 4, !tbaa !5
  %34 = ashr i32 %33, 1
  store i32 %34, ptr %3, align 4, !tbaa !5
  br label %11, !llvm.loop !9

35:                                               ; preds = %11
  %36 = load i32, ptr %5, align 4, !tbaa !5
  store i32 %36, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %37

37:                                               ; preds = %35, %9
  %38 = load i32, ptr %2, align 4
  ret i32 %38
}

; 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"}


; 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: nofree norecurse nosync nounwind memory(none) uwtable
define dso_local i32 @binaryGap(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp slt i32 %0, 3
  br i1 %2, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %1, %7
  %.026 = phi i32 [ %.1, %7 ], [ 0, %1 ]
  %.01125 = phi i32 [ %.2, %7 ], [ 0, %1 ]
  %.01324 = phi i32 [ %.114, %7 ], [ 0, %1 ]
  %.01523 = phi i32 [ %8, %7 ], [ %0, %1 ]
  %3 = and i32 %.01523, 1
  %.not18 = icmp eq i32 %3, 0
  br i1 %.not18, label %5, label %4

4:                                                ; preds = %.preheader
  %spec.select = tail call i32 @llvm.smax.i32(i32 %.01324, i32 %.01125)
  br label %7

5:                                                ; preds = %.preheader
  %.not19 = icmp ne i32 %.026, 0
  %6 = zext i1 %.not19 to i32
  %spec.select21 = add nsw i32 %.01324, %6
  br label %7

7:                                                ; preds = %5, %4
  %.114 = phi i32 [ 1, %4 ], [ %spec.select21, %5 ]
  %.2 = phi i32 [ %spec.select, %4 ], [ %.01125, %5 ]
  %.1 = phi i32 [ 1, %4 ], [ %6, %5 ]
  %8 = lshr i32 %.01523, 1
  %.not = icmp ult i32 %.01523, 2
  br i1 %.not, label %.loopexit, label %.preheader, !llvm.loop !5

.loopexit:                                        ; preds = %7, %1
  %.016 = phi i32 [ 0, %1 ], [ %.2, %7 ]
  ret i32 %.016
}

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

attributes #0 = { nofree norecurse nosync nounwind memory(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" }
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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass