; LLVM IR from xuxping/codelife :: algorthms/array (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"

; Function Attrs: nounwind uwtable
define dso_local i32 @bsearch(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
  %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
  %12 = load ptr, ptr %5, align 8, !tbaa !5
  %13 = icmp eq ptr %12, null
  br i1 %13, label %17, label %14

14:                                               ; preds = %3
  %15 = load i32, ptr %6, align 4, !tbaa !9
  %16 = icmp sle i32 %15, 0
  br i1 %16, label %17, label %18

17:                                               ; preds = %14, %3
  store i32 -1, ptr %4, align 4
  br label %61

18:                                               ; preds = %14
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  store i32 0, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %19 = load i32, ptr %6, align 4, !tbaa !9
  %20 = sub nsw i32 %19, 1
  store i32 %20, ptr %9, align 4, !tbaa !9
  br label %21

21:                                               ; preds = %58, %18
  %22 = load i32, ptr %8, align 4, !tbaa !9
  %23 = load i32, ptr %9, align 4, !tbaa !9
  %24 = icmp sle i32 %22, %23
  br i1 %24, label %25, label %59

25:                                               ; preds = %21
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  %26 = load i32, ptr %8, align 4, !tbaa !9
  %27 = load i32, ptr %9, align 4, !tbaa !9
  %28 = load i32, ptr %8, align 4, !tbaa !9
  %29 = sub nsw i32 %27, %28
  %30 = ashr i32 %29, 1
  %31 = add nsw i32 %26, %30
  store i32 %31, ptr %10, align 4, !tbaa !9
  %32 = load ptr, ptr %5, align 8, !tbaa !5
  %33 = load i32, ptr %10, align 4, !tbaa !9
  %34 = sext i32 %33 to i64
  %35 = getelementptr inbounds i32, ptr %32, i64 %34
  %36 = load i32, ptr %35, align 4, !tbaa !9
  %37 = load i32, ptr %7, align 4, !tbaa !9
  %38 = icmp eq i32 %36, %37
  br i1 %38, label %39, label %41

39:                                               ; preds = %25
  %40 = load i32, ptr %10, align 4, !tbaa !9
  store i32 %40, ptr %4, align 4
  store i32 1, ptr %11, align 4
  br label %56

41:                                               ; preds = %25
  %42 = load ptr, ptr %5, align 8, !tbaa !5
  %43 = load i32, ptr %10, align 4, !tbaa !9
  %44 = sext i32 %43 to i64
  %45 = getelementptr inbounds i32, ptr %42, i64 %44
  %46 = load i32, ptr %45, align 4, !tbaa !9
  %47 = load i32, ptr %7, align 4, !tbaa !9
  %48 = icmp slt i32 %46, %47
  br i1 %48, label %49, label %52

49:                                               ; preds = %41
  %50 = load i32, ptr %10, align 4, !tbaa !9
  %51 = add nsw i32 %50, 1
  store i32 %51, ptr %8, align 4, !tbaa !9
  br label %55

52:                                               ; preds = %41
  %53 = load i32, ptr %10, align 4, !tbaa !9
  %54 = sub nsw i32 %53, 1
  store i32 %54, ptr %9, align 4, !tbaa !9
  br label %55

55:                                               ; preds = %52, %49
  store i32 0, ptr %11, align 4
  br label %56

56:                                               ; preds = %55, %39
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  %57 = load i32, ptr %11, align 4
  switch i32 %57, label %60 [
    i32 0, label %58
  ]

58:                                               ; preds = %56
  br label %21, !llvm.loop !11

59:                                               ; preds = %21
  store i32 -1, ptr %4, align 4
  store i32 1, ptr %11, align 4
  br label %60

60:                                               ; preds = %59, %56
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  br label %61

61:                                               ; preds = %60, %17
  %62 = load i32, ptr %4, align 4
  ret i32 %62
}

; 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 = !{!"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"

; Function Attrs: nofree norecurse nosync nounwind memory(argmem: read) uwtable
define dso_local i32 @bsearch(ptr noundef readonly %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp eq ptr %0, null
  %5 = icmp slt i32 %1, 1
  %or.cond = or i1 %4, %5
  br i1 %or.cond, label %.thread, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %3
  %6 = add nsw i32 %1, -1
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %13
  %.02036 = phi i32 [ %.121, %13 ], [ %6, %.lr.ph.preheader ]
  %.02335 = phi i32 [ %.124, %13 ], [ 0, %.lr.ph.preheader ]
  %7 = sub nsw i32 %.02036, %.02335
  %8 = ashr i32 %7, 1
  %9 = add nsw i32 %8, %.02335
  %10 = sext i32 %9 to i64
  %11 = getelementptr inbounds i32, ptr %0, i64 %10
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %.not30 = icmp eq i32 %12, %2
  br i1 %.not30, label %.thread, label %13

13:                                               ; preds = %.lr.ph
  %14 = icmp slt i32 %12, %2
  %15 = add nsw i32 %9, 1
  %16 = add nsw i32 %9, -1
  %.124 = select i1 %14, i32 %15, i32 %.02335
  %.121 = select i1 %14, i32 %.02036, i32 %16
  %.not = icmp sgt i32 %.124, %.121
  br i1 %.not, label %.thread, label %.lr.ph

.thread:                                          ; preds = %13, %.lr.ph, %3
  %.3 = phi i32 [ -1, %3 ], [ -1, %13 ], [ %9, %.lr.ph ]
  ret i32 %.3
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: read) 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"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass