; LLVM IR from devparthgarg/Data-Structures-and-Algorithms :: 09. Hashing/08 Subarray with Zero Sum/08a SubArray with Zero Sum.ll (Z6isZeroPii)

; 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 nounwind uwtable
define dso_local noundef zeroext i1 @_Z6isZeroPii(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca i1, align 1
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %10

10:                                               ; preds = %43, %2
  %11 = load i32, ptr %6, align 4, !tbaa !9
  %12 = load i32, ptr %5, align 4, !tbaa !9
  %13 = icmp slt i32 %11, %12
  br i1 %13, label %15, label %14

14:                                               ; preds = %10
  store i32 2, ptr %7, align 4
  br label %46

15:                                               ; preds = %10
  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
  %16 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %16, ptr %9, align 4, !tbaa !9
  br label %17

17:                                               ; preds = %34, %15
  %18 = load i32, ptr %9, align 4, !tbaa !9
  %19 = load i32, ptr %5, align 4, !tbaa !9
  %20 = icmp slt i32 %18, %19
  br i1 %20, label %22, label %21

21:                                               ; preds = %17
  store i32 5, ptr %7, align 4
  br label %37

22:                                               ; preds = %17
  %23 = load i32, ptr %8, align 4, !tbaa !9
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = load i32, ptr %9, align 4, !tbaa !9
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds i32, ptr %24, i64 %26
  %28 = load i32, ptr %27, align 4, !tbaa !9
  %29 = add nsw i32 %23, %28
  store i32 %29, ptr %8, align 4, !tbaa !9
  %30 = load i32, ptr %8, align 4, !tbaa !9
  %31 = icmp eq i32 %30, 0
  br i1 %31, label %32, label %33

32:                                               ; preds = %22
  store i1 true, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %37

33:                                               ; preds = %22
  br label %34

34:                                               ; preds = %33
  %35 = load i32, ptr %9, align 4, !tbaa !9
  %36 = add nsw i32 %35, 1
  store i32 %36, ptr %9, align 4, !tbaa !9
  br label %17, !llvm.loop !11

37:                                               ; preds = %32, %21
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  %38 = load i32, ptr %7, align 4
  switch i32 %38, label %40 [
    i32 5, label %39
  ]

39:                                               ; preds = %37
  store i32 0, ptr %7, align 4
  br label %40

40:                                               ; preds = %39, %37
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  %41 = load i32, ptr %7, align 4
  switch i32 %41, label %46 [
    i32 0, label %42
  ]

42:                                               ; preds = %40
  br label %43

43:                                               ; preds = %42
  %44 = load i32, ptr %6, align 4, !tbaa !9
  %45 = add nsw i32 %44, 1
  store i32 %45, ptr %6, align 4, !tbaa !9
  br label %10, !llvm.loop !13

46:                                               ; preds = %40, %14
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %47 = load i32, ptr %7, align 4
  switch i32 %47, label %51 [
    i32 2, label %48
    i32 1, label %49
  ]

48:                                               ; preds = %46
  store i1 false, ptr %3, align 1
  br label %49

49:                                               ; preds = %48, %46
  %50 = load i1, ptr %3, align 1
  ret i1 %50

51:                                               ; preds = %46
  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 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; 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 zeroext i1 @_Z6isZeroPii(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %.not2329 = icmp sgt i32 %1, 0
  br i1 %.not2329, label %.preheader.preheader, label %.thread

.preheader.preheader:                             ; preds = %2
  %wide.trip.count37 = zext nneg i32 %1 to i64
  br label %.preheader

.preheader:                                       ; preds = %.preheader.preheader, %9
  %indvars.iv = phi i64 [ 0, %.preheader.preheader ], [ %indvars.iv.next, %9 ]
  %.not2331 = phi i1 [ true, %.preheader.preheader ], [ %.not23, %9 ]
  %.01730 = phi i32 [ 0, %.preheader.preheader ], [ %10, %9 ]
  br label %4

3:                                                ; preds = %4
  %indvars.iv.next35 = add nuw nsw i64 %indvars.iv34, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next35, %wide.trip.count37
  br i1 %exitcond.not, label %9, label %4, !llvm.loop !5

4:                                                ; preds = %.preheader, %3
  %indvars.iv34 = phi i64 [ %indvars.iv, %.preheader ], [ %indvars.iv.next35, %3 ]
  %.01527 = phi i32 [ 0, %.preheader ], [ %7, %3 ]
  %5 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv34
  %6 = load i32, ptr %5, align 4, !tbaa !7
  %7 = add nsw i32 %6, %.01527
  %8 = icmp eq i32 %7, 0
  br i1 %8, label %.thread, label %3

9:                                                ; preds = %3
  %10 = add nuw nsw i32 %.01730, 1
  %.not23 = icmp slt i32 %10, %1
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond38.not = icmp eq i64 %indvars.iv.next, %wide.trip.count37
  br i1 %exitcond38.not, label %.thread, label %.preheader, !llvm.loop !11

.thread:                                          ; preds = %9, %4, %2
  %.not2326 = phi i1 [ false, %2 ], [ %.not2331, %4 ], [ %.not23, %9 ]
  ret i1 %.not2326
}

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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}
!7 = !{!8, !8, i64 0}
!8 = !{!"int", !9, i64 0}
!9 = !{!"omnipotent char", !10, i64 0}
!10 = !{!"Simple C++ TBAA"}
!11 = distinct !{!11, !6}


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