; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/Bit--Manipulation/Non_Repeating_Integer.ll (Z15NonRepeatingIntPiiS_S_)

; 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 void @_Z15NonRepeatingIntPiiS_S_(ptr noundef %0, i32 noundef %1, ptr noundef %2, ptr noundef %3) #0 {
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store ptr %2, ptr %7, align 8, !tbaa !5
  store ptr %3, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %12 = load ptr, ptr %5, align 8, !tbaa !5
  %13 = getelementptr inbounds i32, ptr %12, i64 0
  %14 = load i32, ptr %13, align 4, !tbaa !9
  store i32 %14, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #2
  %15 = load ptr, ptr %7, align 8, !tbaa !5
  store i32 0, ptr %15, align 4, !tbaa !9
  %16 = load ptr, ptr %8, align 8, !tbaa !5
  store i32 0, ptr %16, align 4, !tbaa !9
  store i32 1, ptr %11, align 4, !tbaa !9
  br label %17

17:                                               ; preds = %29, %4
  %18 = load i32, ptr %11, align 4, !tbaa !9
  %19 = load i32, ptr %6, align 4, !tbaa !9
  %20 = icmp slt i32 %18, %19
  br i1 %20, label %21, label %32

21:                                               ; preds = %17
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = load i32, ptr %11, align 4, !tbaa !9
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds i32, ptr %22, i64 %24
  %26 = load i32, ptr %25, align 4, !tbaa !9
  %27 = load i32, ptr %9, align 4, !tbaa !9
  %28 = xor i32 %27, %26
  store i32 %28, ptr %9, align 4, !tbaa !9
  br label %29

29:                                               ; preds = %21
  %30 = load i32, ptr %11, align 4, !tbaa !9
  %31 = add nsw i32 %30, 1
  store i32 %31, ptr %11, align 4, !tbaa !9
  br label %17, !llvm.loop !11

32:                                               ; preds = %17
  %33 = load i32, ptr %9, align 4, !tbaa !9
  %34 = load i32, ptr %9, align 4, !tbaa !9
  %35 = sub nsw i32 %34, 1
  %36 = xor i32 %35, -1
  %37 = and i32 %33, %36
  store i32 %37, ptr %10, align 4, !tbaa !9
  store i32 0, ptr %11, align 4, !tbaa !9
  br label %38

38:                                               ; preds = %72, %32
  %39 = load i32, ptr %11, align 4, !tbaa !9
  %40 = load i32, ptr %6, align 4, !tbaa !9
  %41 = icmp slt i32 %39, %40
  br i1 %41, label %42, label %75

42:                                               ; preds = %38
  %43 = load ptr, ptr %5, align 8, !tbaa !5
  %44 = load i32, ptr %11, align 4, !tbaa !9
  %45 = sext i32 %44 to i64
  %46 = getelementptr inbounds i32, ptr %43, i64 %45
  %47 = load i32, ptr %46, align 4, !tbaa !9
  %48 = load i32, ptr %10, align 4, !tbaa !9
  %49 = and i32 %47, %48
  %50 = icmp ne i32 %49, 0
  br i1 %50, label %51, label %61

51:                                               ; preds = %42
  %52 = load ptr, ptr %7, align 8, !tbaa !5
  %53 = load i32, ptr %52, align 4, !tbaa !9
  %54 = load ptr, ptr %5, align 8, !tbaa !5
  %55 = load i32, ptr %11, align 4, !tbaa !9
  %56 = sext i32 %55 to i64
  %57 = getelementptr inbounds i32, ptr %54, i64 %56
  %58 = load i32, ptr %57, align 4, !tbaa !9
  %59 = xor i32 %53, %58
  %60 = load ptr, ptr %7, align 8, !tbaa !5
  store i32 %59, ptr %60, align 4, !tbaa !9
  br label %71

61:                                               ; preds = %42
  %62 = load ptr, ptr %8, align 8, !tbaa !5
  %63 = load i32, ptr %62, align 4, !tbaa !9
  %64 = load ptr, ptr %5, align 8, !tbaa !5
  %65 = load i32, ptr %11, align 4, !tbaa !9
  %66 = sext i32 %65 to i64
  %67 = getelementptr inbounds i32, ptr %64, i64 %66
  %68 = load i32, ptr %67, align 4, !tbaa !9
  %69 = xor i32 %63, %68
  %70 = load ptr, ptr %8, align 8, !tbaa !5
  store i32 %69, ptr %70, align 4, !tbaa !9
  br label %71

71:                                               ; preds = %61, %51
  br label %72

72:                                               ; preds = %71
  %73 = load i32, ptr %11, align 4, !tbaa !9
  %74 = add nsw i32 %73, 1
  store i32 %74, ptr %11, align 4, !tbaa !9
  br label %38, !llvm.loop !13

75:                                               ; preds = %38
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  ret void
}

; 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 memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @_Z15NonRepeatingIntPiiS_S_(ptr nocapture noundef readonly %0, i32 noundef %1, ptr nocapture noundef %2, ptr nocapture noundef %3) local_unnamed_addr #0 {
  %5 = load i32, ptr %0, align 4, !tbaa !5
  store i32 0, ptr %2, align 4, !tbaa !5
  store i32 0, ptr %3, align 4, !tbaa !5
  %6 = icmp sgt i32 %1, 1
  br i1 %6, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %4
  %wide.trip.count = zext nneg i32 %1 to i64
  %7 = add nsw i64 %wide.trip.count, -1
  %min.iters.check = icmp ult i32 %1, 9
  br i1 %min.iters.check, label %.lr.ph.preheader42, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %7, -8
  %ind.end = or disjoint i64 %n.vec, 1
  %8 = insertelement <4 x i32> <i32 poison, i32 0, i32 0, i32 0>, i32 %5, i64 0
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.phi = phi <4 x i32> [ %8, %vector.ph ], [ %11, %vector.body ]
  %vec.phi40 = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %12, %vector.body ]
  %offset.idx = or disjoint i64 %index, 1
  %9 = getelementptr inbounds i32, ptr %0, i64 %offset.idx
  %10 = getelementptr inbounds i8, ptr %9, i64 16
  %wide.load = load <4 x i32>, ptr %9, align 4, !tbaa !5
  %wide.load41 = load <4 x i32>, ptr %10, align 4, !tbaa !5
  %11 = xor <4 x i32> %wide.load, %vec.phi
  %12 = xor <4 x i32> %wide.load41, %vec.phi40
  %index.next = add nuw i64 %index, 8
  %13 = icmp eq i64 %index.next, %n.vec
  br i1 %13, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %bin.rdx = xor <4 x i32> %12, %11
  %14 = tail call i32 @llvm.vector.reduce.xor.v4i32(<4 x i32> %bin.rdx)
  %cmp.n = icmp eq i64 %7, %n.vec
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader42

.lr.ph.preheader42:                               ; preds = %middle.block, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 1, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  %.02426.ph = phi i32 [ %5, %.lr.ph.preheader ], [ %14, %middle.block ]
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader42, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ %indvars.iv.ph, %.lr.ph.preheader42 ]
  %.02426 = phi i32 [ %17, %.lr.ph ], [ %.02426.ph, %.lr.ph.preheader42 ]
  %15 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %17 = xor i32 %16, %.02426
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %.lr.ph, %middle.block, %4
  %.024.lcssa = phi i32 [ %5, %4 ], [ %14, %middle.block ], [ %17, %.lr.ph ]
  %18 = sub i32 0, %.024.lcssa
  %19 = and i32 %.024.lcssa, %18
  %20 = icmp sgt i32 %1, 0
  br i1 %20, label %.lr.ph30.preheader, label %._crit_edge31

.lr.ph30.preheader:                               ; preds = %._crit_edge
  %wide.trip.count36 = zext nneg i32 %1 to i64
  %xtraiter = and i64 %wide.trip.count36, 1
  %21 = icmp eq i32 %1, 1
  br i1 %21, label %._crit_edge31.loopexit.unr-lcssa, label %.lr.ph30.preheader.new

.lr.ph30.preheader.new:                           ; preds = %.lr.ph30.preheader
  %unroll_iter = and i64 %wide.trip.count36, 2147483646
  br label %.lr.ph30

.lr.ph30:                                         ; preds = %.lr.ph30, %.lr.ph30.preheader.new
  %indvars.iv33 = phi i64 [ 0, %.lr.ph30.preheader.new ], [ %indvars.iv.next34.1, %.lr.ph30 ]
  %niter = phi i64 [ 0, %.lr.ph30.preheader.new ], [ %niter.next.1, %.lr.ph30 ]
  %22 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv33
  %23 = load i32, ptr %22, align 4, !tbaa !5
  %24 = and i32 %19, %23
  %.not = icmp eq i32 %24, 0
  %. = select i1 %.not, ptr %3, ptr %2
  %25 = load i32, ptr %., align 4, !tbaa !5
  %26 = xor i32 %25, %23
  store i32 %26, ptr %., align 4, !tbaa !5
  %indvars.iv.next34 = or disjoint i64 %indvars.iv33, 1
  %27 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next34
  %28 = load i32, ptr %27, align 4, !tbaa !5
  %29 = and i32 %19, %28
  %.not.1 = icmp eq i32 %29, 0
  %..1 = select i1 %.not.1, ptr %3, ptr %2
  %30 = load i32, ptr %..1, align 4, !tbaa !5
  %31 = xor i32 %30, %28
  store i32 %31, ptr %..1, align 4, !tbaa !5
  %indvars.iv.next34.1 = add nuw nsw i64 %indvars.iv33, 2
  %niter.next.1 = add i64 %niter, 2
  %niter.ncmp.1 = icmp eq i64 %niter.next.1, %unroll_iter
  br i1 %niter.ncmp.1, label %._crit_edge31.loopexit.unr-lcssa, label %.lr.ph30, !llvm.loop !14

._crit_edge31.loopexit.unr-lcssa:                 ; preds = %.lr.ph30, %.lr.ph30.preheader
  %indvars.iv33.unr = phi i64 [ 0, %.lr.ph30.preheader ], [ %indvars.iv.next34.1, %.lr.ph30 ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge31, label %.lr.ph30.epil

.lr.ph30.epil:                                    ; preds = %._crit_edge31.loopexit.unr-lcssa
  %32 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv33.unr
  %33 = load i32, ptr %32, align 4, !tbaa !5
  %34 = and i32 %19, %33
  %.not.epil = icmp eq i32 %34, 0
  %..epil = select i1 %.not.epil, ptr %3, ptr %2
  %35 = load i32, ptr %..epil, align 4, !tbaa !5
  %36 = xor i32 %35, %33
  store i32 %36, ptr %..epil, align 4, !tbaa !5
  br label %._crit_edge31

._crit_edge31:                                    ; preds = %.lr.ph30.epil, %._crit_edge31.loopexit.unr-lcssa, %._crit_edge
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.vector.reduce.xor.v4i32(<4 x i32>) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(readwrite, 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" }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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"}
!9 = distinct !{!9, !10, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !10, !12, !11}
!14 = distinct !{!14, !10}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass