; LLVM IR from scandum/binary_search :: binary_search (breaking_linear_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"

@checks = external dso_local global i32, align 4

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @breaking_linear_search(ptr noundef %0, i32 noundef %1, i32 noundef %2) #1 {
  %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
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %10 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %10, ptr %8, align 4, !tbaa !9
  %11 = load i32, ptr %6, align 4, !tbaa !9
  %12 = icmp eq i32 %11, 0
  br i1 %12, label %13, label %14

13:                                               ; preds = %3
  store i32 -1, ptr %4, align 4
  store i32 1, ptr %9, align 4
  br label %44

14:                                               ; preds = %3
  br label %15

15:                                               ; preds = %30, %14
  %16 = load i32, ptr %8, align 4, !tbaa !9
  %17 = add i32 %16, -1
  store i32 %17, ptr %8, align 4, !tbaa !9
  %18 = icmp ne i32 %17, 0
  br i1 %18, label %19, label %31

19:                                               ; preds = %15
  %20 = load i32, ptr @checks, align 4, !tbaa !9
  %21 = add i32 %20, 1
  store i32 %21, ptr @checks, align 4, !tbaa !9
  %22 = load i32, ptr %7, align 4, !tbaa !9
  %23 = load ptr, ptr %5, align 8, !tbaa !5
  %24 = load i32, ptr %8, align 4, !tbaa !9
  %25 = zext i32 %24 to i64
  %26 = getelementptr inbounds i32, ptr %23, i64 %25
  %27 = load i32, ptr %26, align 4, !tbaa !9
  %28 = icmp sge i32 %22, %27
  br i1 %28, label %29, label %30

29:                                               ; preds = %19
  br label %31

30:                                               ; preds = %19
  br label %15, !llvm.loop !11

31:                                               ; preds = %29, %15
  %32 = load i32, ptr @checks, align 4, !tbaa !9
  %33 = add i32 %32, 1
  store i32 %33, ptr @checks, align 4, !tbaa !9
  %34 = load i32, ptr %7, align 4, !tbaa !9
  %35 = load ptr, ptr %5, align 8, !tbaa !5
  %36 = load i32, ptr %8, align 4, !tbaa !9
  %37 = zext i32 %36 to i64
  %38 = getelementptr inbounds i32, ptr %35, i64 %37
  %39 = load i32, ptr %38, align 4, !tbaa !9
  %40 = icmp eq i32 %34, %39
  br i1 %40, label %41, label %43

41:                                               ; preds = %31
  %42 = load i32, ptr %8, align 4, !tbaa !9
  store i32 %42, ptr %4, align 4
  store i32 1, ptr %9, align 4
  br label %44

43:                                               ; preds = %31
  store i32 -1, ptr %4, align 4
  store i32 1, ptr %9, align 4
  br label %44

44:                                               ; preds = %43, %41, %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  %45 = load i32, ptr %4, align 4
  ret i32 %45
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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"

@checks = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: nofree norecurse nosync nounwind memory(readwrite, argmem: read, inaccessiblemem: none) uwtable
define dso_local i32 @breaking_linear_search(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp eq i32 %1, 0
  br i1 %4, label %19, label %.preheader

.preheader:                                       ; preds = %3
  %checks.promoted = load i32, ptr @checks, align 4, !tbaa !5
  %5 = zext i32 %1 to i64
  br label %6

6:                                                ; preds = %.preheader, %8
  %indvars.iv = phi i64 [ %5, %.preheader ], [ %indvars.iv.next, %8 ]
  %7 = phi i32 [ %checks.promoted, %.preheader ], [ %9, %8 ]
  %indvars.iv.next = add nsw i64 %indvars.iv, -1
  %indvars = trunc i64 %indvars.iv.next to i32
  %.not = icmp eq i32 %indvars, 0
  br i1 %.not, label %._crit_edge, label %8

8:                                                ; preds = %6
  %9 = add i32 %7, 1
  store i32 %9, ptr @checks, align 4, !tbaa !5
  %10 = and i64 %indvars.iv.next, 4294967295
  %11 = getelementptr inbounds i32, ptr %0, i64 %10
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %.not13 = icmp sgt i32 %12, %2
  br i1 %.not13, label %6, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %8, %6
  %13 = phi i32 [ %7, %6 ], [ %9, %8 ]
  %14 = add i32 %13, 1
  store i32 %14, ptr @checks, align 4, !tbaa !5
  %15 = and i64 %indvars.iv.next, 4294967295
  %16 = getelementptr inbounds i32, ptr %0, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = icmp eq i32 %17, %2
  %. = select i1 %18, i32 %indvars, i32 -1
  br label %19

19:                                               ; preds = %._crit_edge, %3
  %.010 = phi i32 [ -1, %3 ], [ %., %._crit_edge ]
  ret i32 %.010
}

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

!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,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass