; LLVM IR from devparthgarg/Data-Structures-and-Algorithms :: 03. Bit Manipulation/05 One Odd Occurring/Bonus Question.ll (Z7missingPii)

; 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 i32 @_Z7missingPii(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 1, ptr %6, align 4, !tbaa !9
  br label %8

8:                                                ; preds = %17, %2
  %9 = load i32, ptr %6, align 4, !tbaa !9
  %10 = load i32, ptr %4, align 4, !tbaa !9
  %11 = icmp sle i32 %9, %10
  br i1 %11, label %13, label %12

12:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %20

13:                                               ; preds = %8
  %14 = load i32, ptr %5, align 4, !tbaa !9
  %15 = load i32, ptr %6, align 4, !tbaa !9
  %16 = xor i32 %14, %15
  store i32 %16, ptr %5, align 4, !tbaa !9
  br label %17

17:                                               ; preds = %13
  %18 = load i32, ptr %6, align 4, !tbaa !9
  %19 = add nsw i32 %18, 1
  store i32 %19, ptr %6, align 4, !tbaa !9
  br label %8, !llvm.loop !11

20:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %21

21:                                               ; preds = %35, %20
  %22 = load i32, ptr %7, align 4, !tbaa !9
  %23 = load i32, ptr %4, align 4, !tbaa !9
  %24 = sub nsw i32 %23, 1
  %25 = icmp slt i32 %22, %24
  br i1 %25, label %27, label %26

26:                                               ; preds = %21
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  br label %38

27:                                               ; preds = %21
  %28 = load i32, ptr %5, align 4, !tbaa !9
  %29 = load ptr, ptr %3, align 8, !tbaa !5
  %30 = load i32, ptr %7, align 4, !tbaa !9
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds i32, ptr %29, i64 %31
  %33 = load i32, ptr %32, align 4, !tbaa !9
  %34 = xor i32 %28, %33
  store i32 %34, ptr %5, align 4, !tbaa !9
  br label %35

35:                                               ; preds = %27
  %36 = load i32, ptr %7, align 4, !tbaa !9
  %37 = add nsw i32 %36, 1
  store i32 %37, ptr %7, align 4, !tbaa !9
  br label %21, !llvm.loop !13

38:                                               ; preds = %26
  %39 = load i32, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret i32 %39
}

; 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 i32 @_Z7missingPii(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %.not14 = icmp slt i32 %1, 1
  br i1 %.not14, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %2
  %min.iters.check = icmp ult i32 %1, 8
  br i1 %min.iters.check, label %.lr.ph.preheader48, label %vector.ph

.lr.ph.preheader48:                               ; preds = %middle.block, %.lr.ph.preheader
  %.01116.ph = phi i32 [ 1, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  %.01215.ph = phi i32 [ 0, %.lr.ph.preheader ], [ %6, %middle.block ]
  br label %.lr.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i32 %1, 2147483640
  %ind.end = or disjoint i32 %n.vec, 1
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i32 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.ind = phi <4 x i32> [ <i32 1, i32 2, i32 3, i32 4>, %vector.ph ], [ %vec.ind.next, %vector.body ]
  %vec.phi = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %3, %vector.body ]
  %vec.phi28 = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %4, %vector.body ]
  %step.add = add <4 x i32> %vec.ind, <i32 4, i32 4, i32 4, i32 4>
  %3 = xor <4 x i32> %vec.ind, %vec.phi
  %4 = xor <4 x i32> %step.add, %vec.phi28
  %index.next = add nuw i32 %index, 8
  %vec.ind.next = add <4 x i32> %vec.ind, <i32 8, i32 8, i32 8, i32 8>
  %5 = icmp eq i32 %index.next, %n.vec
  br i1 %5, label %middle.block, label %vector.body, !llvm.loop !5

middle.block:                                     ; preds = %vector.body
  %bin.rdx = xor <4 x i32> %4, %3
  %6 = tail call i32 @llvm.vector.reduce.xor.v4i32(<4 x i32> %bin.rdx)
  %cmp.n = icmp eq i32 %n.vec, %1
  br i1 %cmp.n, label %.preheader, label %.lr.ph.preheader48

.preheader:                                       ; preds = %.lr.ph, %middle.block
  %.lcssa26 = phi i32 [ %6, %middle.block ], [ %15, %.lr.ph ]
  %.not = icmp eq i32 %1, 1
  br i1 %.not, label %._crit_edge, label %.lr.ph19.preheader

.lr.ph19.preheader:                               ; preds = %.preheader
  %7 = add nsw i32 %1, -1
  %wide.trip.count = zext nneg i32 %7 to i64
  %min.iters.check31 = icmp ult i32 %1, 9
  br i1 %min.iters.check31, label %.lr.ph19.preheader45, label %vector.ph32

.lr.ph19.preheader45:                             ; preds = %middle.block29, %.lr.ph19.preheader
  %indvars.iv.ph = phi i64 [ 0, %.lr.ph19.preheader ], [ %n.vec34, %middle.block29 ]
  %.117.ph = phi i32 [ %.lcssa26, %.lr.ph19.preheader ], [ %14, %middle.block29 ]
  br label %.lr.ph19

vector.ph32:                                      ; preds = %.lr.ph19.preheader
  %n.vec34 = and i64 %wide.trip.count, 2147483640
  %8 = insertelement <4 x i32> <i32 poison, i32 0, i32 0, i32 0>, i32 %.lcssa26, i64 0
  br label %vector.body36

vector.body36:                                    ; preds = %vector.body36, %vector.ph32
  %index37 = phi i64 [ 0, %vector.ph32 ], [ %index.next41, %vector.body36 ]
  %vec.phi38 = phi <4 x i32> [ %8, %vector.ph32 ], [ %11, %vector.body36 ]
  %vec.phi39 = phi <4 x i32> [ zeroinitializer, %vector.ph32 ], [ %12, %vector.body36 ]
  %9 = getelementptr inbounds i32, ptr %0, i64 %index37
  %10 = getelementptr inbounds i8, ptr %9, i64 16
  %wide.load = load <4 x i32>, ptr %9, align 4, !tbaa !9
  %wide.load40 = load <4 x i32>, ptr %10, align 4, !tbaa !9
  %11 = xor <4 x i32> %wide.load, %vec.phi38
  %12 = xor <4 x i32> %wide.load40, %vec.phi39
  %index.next41 = add nuw i64 %index37, 8
  %13 = icmp eq i64 %index.next41, %n.vec34
  br i1 %13, label %middle.block29, label %vector.body36, !llvm.loop !13

middle.block29:                                   ; preds = %vector.body36
  %bin.rdx42 = xor <4 x i32> %12, %11
  %14 = tail call i32 @llvm.vector.reduce.xor.v4i32(<4 x i32> %bin.rdx42)
  %cmp.n43 = icmp eq i64 %n.vec34, %wide.trip.count
  br i1 %cmp.n43, label %._crit_edge, label %.lr.ph19.preheader45

.lr.ph:                                           ; preds = %.lr.ph.preheader48, %.lr.ph
  %.01116 = phi i32 [ %16, %.lr.ph ], [ %.01116.ph, %.lr.ph.preheader48 ]
  %.01215 = phi i32 [ %15, %.lr.ph ], [ %.01215.ph, %.lr.ph.preheader48 ]
  %15 = xor i32 %.01116, %.01215
  %16 = add nuw i32 %.01116, 1
  %exitcond.not = icmp eq i32 %.01116, %1
  br i1 %exitcond.not, label %.preheader, label %.lr.ph, !llvm.loop !14

._crit_edge:                                      ; preds = %.lr.ph19, %middle.block29, %2, %.preheader
  %.1.lcssa = phi i32 [ %.lcssa26, %.preheader ], [ 0, %2 ], [ %14, %middle.block29 ], [ %19, %.lr.ph19 ]
  ret i32 %.1.lcssa

.lr.ph19:                                         ; preds = %.lr.ph19.preheader45, %.lr.ph19
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph19 ], [ %indvars.iv.ph, %.lr.ph19.preheader45 ]
  %.117 = phi i32 [ %19, %.lr.ph19 ], [ %.117.ph, %.lr.ph19.preheader45 ]
  %17 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %18 = load i32, ptr %17, align 4, !tbaa !9
  %19 = xor i32 %18, %.117
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond23.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond23.not, label %._crit_edge, label %.lr.ph19, !llvm.loop !15
}

; 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 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" }
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 = distinct !{!5, !6, !7, !8}
!6 = !{!"llvm.loop.mustprogress"}
!7 = !{!"llvm.loop.isvectorized", i32 1}
!8 = !{!"llvm.loop.unroll.runtime.disable"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !11, i64 0}
!11 = !{!"omnipotent char", !12, i64 0}
!12 = !{!"Simple C++ TBAA"}
!13 = distinct !{!13, !6, !7, !8}
!14 = distinct !{!14, !6, !8, !7}
!15 = distinct !{!15, !6, !8, !7}


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