; LLVM IR from CodersForLife/Data-Structures-Algorithms :: Searching/Binary-Search.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: mustprogress uwtable
define dso_local noundef i32 @_Z12binarySearchPiiii(ptr noundef %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) #0 {
  %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
  %12 = load i32, ptr %8, align 4, !tbaa !9
  %13 = load i32, ptr %7, align 4, !tbaa !9
  %14 = icmp sge i32 %12, %13
  br i1 %14, label %15, label %63

15:                                               ; preds = %4
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  %16 = load i32, ptr %7, align 4, !tbaa !9
  %17 = load i32, ptr %8, align 4, !tbaa !9
  %18 = add nsw i32 %16, %17
  %19 = sdiv i32 %18, 2
  store i32 %19, ptr %10, align 4, !tbaa !9
  %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 = %15
  %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 %60

29:                                               ; preds = %15
  %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 %44

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 = sub nsw i32 %40, 1
  %42 = load i32, ptr %9, align 4, !tbaa !9
  %43 = call noundef i32 @_Z12binarySearchPiiii(ptr noundef %38, i32 noundef %39, i32 noundef %41, i32 noundef %42)
  store i32 %43, ptr %5, align 4
  store i32 1, ptr %11, align 4
  br label %60

44:                                               ; preds = %29
  %45 = load ptr, ptr %6, align 8, !tbaa !5
  %46 = load i32, ptr %10, align 4, !tbaa !9
  %47 = sext i32 %46 to i64
  %48 = getelementptr inbounds i32, ptr %45, i64 %47
  %49 = load i32, ptr %48, align 4, !tbaa !9
  %50 = load i32, ptr %9, align 4, !tbaa !9
  %51 = icmp slt i32 %49, %50
  br i1 %51, label %52, label %59

52:                                               ; preds = %44
  %53 = load ptr, ptr %6, align 8, !tbaa !5
  %54 = load i32, ptr %10, align 4, !tbaa !9
  %55 = add nsw i32 %54, 1
  %56 = load i32, ptr %8, align 4, !tbaa !9
  %57 = load i32, ptr %9, align 4, !tbaa !9
  %58 = call noundef i32 @_Z12binarySearchPiiii(ptr noundef %53, i32 noundef %55, i32 noundef %56, i32 noundef %57)
  store i32 %58, ptr %5, align 4
  store i32 1, ptr %11, align 4
  br label %60

59:                                               ; preds = %44
  store i32 0, ptr %11, align 4
  br label %60

60:                                               ; preds = %59, %52, %37, %27
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  %61 = load i32, ptr %11, align 4
  switch i32 %61, label %66 [
    i32 0, label %62
    i32 1, label %64
  ]

62:                                               ; preds = %60
  br label %63

63:                                               ; preds = %62, %4
  store i32 -1, ptr %5, align 4
  br label %64

64:                                               ; preds = %63, %60
  %65 = load i32, ptr %5, align 4
  ret i32 %65

66:                                               ; preds = %60
  unreachable
}

; 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 = { 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 #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++ 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 i32 @_Z12binarySearchPiiii(ptr nocapture noundef readonly %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %.not3741 = icmp slt i32 %2, %1
  br i1 %.not3741, label %.thread, label %.lr.ph

.lr.ph:                                           ; preds = %4, %15
  %.tr32.ph43 = phi i32 [ %.tr3238, %15 ], [ %2, %4 ]
  %.tr31.ph42 = phi i32 [ %17, %15 ], [ %1, %4 ]
  br label %5

5:                                                ; preds = %.lr.ph, %tailrecurse
  %.tr3238 = phi i32 [ %.tr32.ph43, %.lr.ph ], [ %14, %tailrecurse ]
  %6 = add nsw i32 %.tr3238, %.tr31.ph42
  %7 = sdiv i32 %6, 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 %.thread, label %12

12:                                               ; preds = %5
  %13 = icmp sgt i32 %10, %3
  br i1 %13, label %tailrecurse, label %15

tailrecurse:                                      ; preds = %12
  %14 = add nsw i32 %7, -1
  %.not.not = icmp sgt i32 %7, %.tr31.ph42
  br i1 %.not.not, label %5, label %.thread

15:                                               ; preds = %12
  %16 = icmp slt i32 %10, %3
  %17 = add nsw i32 %7, 1
  %.not37.not = icmp sgt i32 %.tr3238, %7
  %or.cond = and i1 %16, %.not37.not
  br i1 %or.cond, label %.lr.ph, label %.thread

.thread:                                          ; preds = %15, %tailrecurse, %5, %4
  %.1 = phi i32 [ -1, %4 ], [ -1, %tailrecurse ], [ %7, %5 ], [ -1, %15 ]
  ret i32 %.1
}

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,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass