; LLVM IR from kaynewbie/algorithm :: algorithm/CodingInterviews (binary-search)

; 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"

@.str = external hidden unnamed_addr constant [17 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local zeroext i1 @binarySearch(ptr noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %4 = alloca i1, align 1
  %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
  %10 = alloca i32, align 4
  %11 = 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
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  store i32 0, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  store i32 0, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  store i32 0, ptr %10, align 4, !tbaa !9
  br label %12

12:                                               ; preds = %48, %3
  %13 = load i32, ptr %6, align 4, !tbaa !9
  %14 = icmp sgt i32 %13, 0
  br i1 %14, label %15, label %49

15:                                               ; preds = %12
  %16 = load i32, ptr %10, align 4, !tbaa !9
  %17 = add nsw i32 %16, 1
  store i32 %17, ptr %10, align 4, !tbaa !9
  %18 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %16)
  %19 = load i32, ptr %6, align 4, !tbaa !9
  %20 = sub nsw i32 %19, 1
  %21 = ashr i32 %20, 1
  store i32 %21, ptr %8, align 4, !tbaa !9
  %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
  store i32 %26, ptr %9, align 4, !tbaa !9
  %27 = load i32, ptr %7, align 4, !tbaa !9
  %28 = load i32, ptr %9, align 4, !tbaa !9
  %29 = icmp eq i32 %27, %28
  br i1 %29, label %30, label %31

30:                                               ; preds = %15
  store i1 true, ptr %4, align 1
  store i32 1, ptr %11, align 4
  br label %50

31:                                               ; preds = %15
  %32 = load i32, ptr %7, align 4, !tbaa !9
  %33 = load i32, ptr %9, align 4, !tbaa !9
  %34 = icmp sgt i32 %32, %33
  br i1 %34, label %35, label %45

35:                                               ; preds = %31
  %36 = load i32, ptr %8, align 4, !tbaa !9
  %37 = add nsw i32 %36, 1
  %38 = load ptr, ptr %5, align 8, !tbaa !5
  %39 = sext i32 %37 to i64
  %40 = getelementptr inbounds i32, ptr %38, i64 %39
  store ptr %40, ptr %5, align 8, !tbaa !5
  %41 = load i32, ptr %8, align 4, !tbaa !9
  %42 = add nsw i32 1, %41
  %43 = load i32, ptr %6, align 4, !tbaa !9
  %44 = sub nsw i32 %43, %42
  store i32 %44, ptr %6, align 4, !tbaa !9
  br label %47

45:                                               ; preds = %31
  %46 = load i32, ptr %8, align 4, !tbaa !9
  store i32 %46, ptr %6, align 4, !tbaa !9
  br label %47

47:                                               ; preds = %45, %35
  br label %48

48:                                               ; preds = %47
  br label %12, !llvm.loop !11

49:                                               ; preds = %12
  store i1 false, ptr %4, align 1
  store i32 1, ptr %11, align 4
  br label %50

50:                                               ; preds = %49, %30
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  %51 = load i1, ptr %4, align 1
  ret i1 %51
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

declare i32 @printf(ptr noundef, ...) #2

; 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 = { "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/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"

@.str = external hidden unnamed_addr constant [17 x i8], align 1

; Function Attrs: nofree nounwind uwtable
define dso_local noundef zeroext i1 @binarySearch(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp sgt i32 %1, 0
  br i1 %4, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %3, %12
  %.022 = phi i32 [ %13, %12 ], [ 0, %3 ]
  %.01521 = phi i32 [ %.1, %12 ], [ %1, %3 ]
  %.01620 = phi ptr [ %.117, %12 ], [ %0, %3 ]
  %5 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %.022)
  %6 = add nsw i32 %.01521, -1
  %7 = lshr i32 %6, 1
  %8 = zext nneg i32 %7 to i64
  %9 = getelementptr inbounds i32, ptr %.01620, i64 %8
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %11 = icmp eq i32 %10, %2
  br i1 %11, label %._crit_edge, label %12

12:                                               ; preds = %.lr.ph
  %13 = add nuw nsw i32 %.022, 1
  %14 = icmp slt i32 %10, %2
  %15 = add nuw nsw i32 %7, 1
  %16 = sub nsw i32 %.01521, %15
  %narrow = select i1 %14, i32 %15, i32 0
  %.117.idx = zext nneg i32 %narrow to i64
  %.117 = getelementptr inbounds i32, ptr %.01620, i64 %.117.idx
  %.1 = select i1 %14, i32 %16, i32 %7
  %17 = icmp sgt i32 %.1, 0
  br i1 %17, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %12, %3
  %.lcssa = phi i1 [ false, %3 ], [ %11, %12 ], [ %11, %.lr.ph ]
  ret i1 %.lcssa
}

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

attributes #0 = { nofree 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 = { nofree nounwind "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"}


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