; LLVM IR from scandum/binary_search :: binary_search (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: nounwind uwtable
define dso_local i32 @linear_search(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
  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
  br label %11

11:                                               ; preds = %27, %3
  %12 = load i32, ptr %8, align 4, !tbaa !9
  %13 = add i32 %12, -1
  store i32 %13, ptr %8, align 4, !tbaa !9
  %14 = icmp ne i32 %12, 0
  br i1 %14, label %15, label %28

15:                                               ; preds = %11
  %16 = load i32, ptr @checks, align 4, !tbaa !9
  %17 = add i32 %16, 1
  store i32 %17, ptr @checks, align 4, !tbaa !9
  %18 = load i32, ptr %7, align 4, !tbaa !9
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = load i32, ptr %8, align 4, !tbaa !9
  %21 = zext i32 %20 to i64
  %22 = getelementptr inbounds i32, ptr %19, i64 %21
  %23 = load i32, ptr %22, align 4, !tbaa !9
  %24 = icmp eq i32 %18, %23
  br i1 %24, label %25, label %27

25:                                               ; preds = %15
  %26 = load i32, ptr %8, align 4, !tbaa !9
  store i32 %26, ptr %4, align 4
  store i32 1, ptr %9, align 4
  br label %29

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

28:                                               ; preds = %11
  store i32 -1, ptr %4, align 4
  store i32 1, ptr %9, align 4
  br label %29

29:                                               ; preds = %28, %25
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  %30 = load i32, ptr %4, align 4
  ret i32 %30
}

; 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"

@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 @linear_search(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %checks.promoted = load i32, ptr @checks, align 4, !tbaa !5
  %4 = zext i32 %1 to i64
  br label %5

5:                                                ; preds = %7, %3
  %indvars.iv = phi i64 [ %indvars.iv.next, %7 ], [ %4, %3 ]
  %6 = phi i32 [ %8, %7 ], [ %checks.promoted, %3 ]
  %.not = icmp eq i64 %indvars.iv, 0
  br i1 %.not, label %.split.loop.exit, label %7

7:                                                ; preds = %5
  %indvars.iv.next = add nsw i64 %indvars.iv, -1
  %8 = add i32 %6, 1
  store i32 %8, ptr @checks, align 4, !tbaa !5
  %9 = and i64 %indvars.iv.next, 4294967295
  %10 = getelementptr inbounds i32, ptr %0, i64 %9
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %12 = icmp eq i32 %11, %2
  br i1 %12, label %.split.loop.exit8, label %5, !llvm.loop !9

.split.loop.exit8:                                ; preds = %7
  %indvars.le = trunc i64 %indvars.iv.next to i32
  br label %.split.loop.exit

.split.loop.exit:                                 ; preds = %5, %.split.loop.exit8
  %.lcssa = phi i32 [ %indvars.le, %.split.loop.exit8 ], [ -1, %5 ]
  ret i32 %.lcssa
}

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