; LLVM IR from JessonYue/LeetCodeLearning :: BaseDataStructure/BinarySearch.ll (Z12binarySearchPiiii)

; 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: 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: mustprogress uwtable
define dso_local noundef i32 @_Z12binarySearchPiiii(ptr noundef %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) #1 {
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %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 %6, align 8, !tbaa !5
  store i32 %1, ptr %7, align 4, !tbaa !9
  store i32 %2, ptr %8, align 4, !tbaa !9
  store i32 %3, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = load i32, ptr %8, align 4, !tbaa !9
  %14 = add nsw i32 %12, %13
  %15 = sdiv i32 %14, 2
  store i32 %15, ptr %10, align 4, !tbaa !9
  %16 = load i32, ptr %7, align 4, !tbaa !9
  %17 = load i32, ptr %8, align 4, !tbaa !9
  %18 = icmp slt i32 %16, %17
  br i1 %18, label %19, label %50

19:                                               ; preds = %4
  %20 = load ptr, ptr %6, align 8, !tbaa !5
  %21 = load i32, ptr %10, align 4, !tbaa !9
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds i32, ptr %20, i64 %22
  %24 = load i32, ptr %23, align 4, !tbaa !9
  %25 = load i32, ptr %9, align 4, !tbaa !9
  %26 = icmp eq i32 %24, %25
  br i1 %26, label %27, label %29

27:                                               ; preds = %19
  %28 = load i32, ptr %10, align 4, !tbaa !9
  store i32 %28, ptr %5, align 4
  store i32 1, ptr %11, align 4
  br label %51

29:                                               ; preds = %19
  %30 = load ptr, ptr %6, align 8, !tbaa !5
  %31 = load i32, ptr %10, align 4, !tbaa !9
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds i32, ptr %30, i64 %32
  %34 = load i32, ptr %33, align 4, !tbaa !9
  %35 = load i32, ptr %9, align 4, !tbaa !9
  %36 = icmp sgt i32 %34, %35
  br i1 %36, label %37, label %43

37:                                               ; preds = %29
  %38 = load ptr, ptr %6, align 8, !tbaa !5
  %39 = load i32, ptr %7, align 4, !tbaa !9
  %40 = load i32, ptr %10, align 4, !tbaa !9
  %41 = load i32, ptr %9, align 4, !tbaa !9
  %42 = call noundef i32 @_Z12binarySearchPiiii(ptr noundef %38, i32 noundef %39, i32 noundef %40, i32 noundef %41)
  store i32 %42, ptr %5, align 4
  store i32 1, ptr %11, align 4
  br label %51

43:                                               ; preds = %29
  %44 = load ptr, ptr %6, align 8, !tbaa !5
  %45 = load i32, ptr %10, align 4, !tbaa !9
  %46 = add nsw i32 %45, 1
  %47 = load i32, ptr %8, align 4, !tbaa !9
  %48 = load i32, ptr %9, align 4, !tbaa !9
  %49 = call noundef i32 @_Z12binarySearchPiiii(ptr noundef %44, i32 noundef %46, i32 noundef %47, i32 noundef %48)
  store i32 %49, ptr %5, align 4
  store i32 1, ptr %11, align 4
  br label %51

50:                                               ; preds = %4
  store i32 -1, ptr %5, align 4
  store i32 1, ptr %11, align 4
  br label %51

51:                                               ; preds = %50, %43, %37, %27
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  %52 = load i32, ptr %5, align 4
  ret i32 %52
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}


; 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: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef range(i32 -1073741824, 1073741824) i32 @_Z12binarySearchPiiii(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = icmp slt i32 %1, %2
  br i1 %5, label %.lr.ph.preheader, label %tailrecurse._crit_edge

.lr.ph.preheader:                                 ; preds = %4
  %6 = add nsw i32 %2, %1
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %tailrecurse
  %.in = phi i32 [ %14, %tailrecurse ], [ %6, %.lr.ph.preheader ]
  %.tr2428 = phi i32 [ %spec.select26, %tailrecurse ], [ %2, %.lr.ph.preheader ]
  %.tr2327 = phi i32 [ %spec.select, %tailrecurse ], [ %1, %.lr.ph.preheader ]
  %7 = sdiv i32 %.in, 2
  %8 = sext i32 %7 to i64
  %9 = getelementptr inbounds i32, ptr %0, i64 %8
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %11 = icmp eq i32 %10, %3
  br i1 %11, label %tailrecurse._crit_edge, label %tailrecurse

tailrecurse:                                      ; preds = %.lr.ph
  %12 = icmp sgt i32 %10, %3
  %13 = add nsw i32 %7, 1
  %spec.select = select i1 %12, i32 %.tr2327, i32 %13
  %spec.select26 = select i1 %12, i32 %7, i32 %.tr2428
  %14 = add nsw i32 %spec.select26, %spec.select
  %15 = icmp slt i32 %spec.select, %spec.select26
  br i1 %15, label %.lr.ph, label %tailrecurse._crit_edge

tailrecurse._crit_edge:                           ; preds = %.lr.ph, %tailrecurse, %4
  %.0 = phi i32 [ -1, %4 ], [ -1, %tailrecurse ], [ %7, %.lr.ph ]
  ret i32 %.0
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn 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++ TBAA"}


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