; LLVM IR from tangjz/acm-icpc :: hackerrank/xor-subsequence.ll (Z11FWT_iteratePxii)

; 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 @_Z11FWT_iteratePxii(ptr noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %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
  %10 = alloca i64, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store i32 %2, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %68, %3
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = load i32, ptr %5, align 4, !tbaa !9
  %14 = icmp slt i32 %12, %13
  br i1 %14, label %16, label %15

15:                                               ; preds = %11
  store i32 2, ptr %8, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  br label %73

16:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  store i32 0, ptr %9, align 4, !tbaa !9
  br label %17

17:                                               ; preds = %64, %16
  %18 = load i32, ptr %9, align 4, !tbaa !9
  %19 = load i32, ptr %6, align 4, !tbaa !9
  %20 = icmp slt i32 %18, %19
  br i1 %20, label %22, label %21

21:                                               ; preds = %17
  store i32 5, ptr %8, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  br label %67

22:                                               ; preds = %17
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #2
  %23 = load ptr, ptr %4, align 8, !tbaa !5
  %24 = load i32, ptr %7, align 4, !tbaa !9
  %25 = load i32, ptr %6, align 4, !tbaa !9
  %26 = add nsw i32 %24, %25
  %27 = load i32, ptr %9, align 4, !tbaa !9
  %28 = add nsw i32 %26, %27
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds i64, ptr %23, i64 %29
  %31 = load i64, ptr %30, align 8, !tbaa !11
  store i64 %31, ptr %10, align 8, !tbaa !11
  %32 = load ptr, ptr %4, align 8, !tbaa !5
  %33 = load i32, ptr %7, align 4, !tbaa !9
  %34 = load i32, ptr %9, align 4, !tbaa !9
  %35 = add nsw i32 %33, %34
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds i64, ptr %32, i64 %36
  %38 = load i64, ptr %37, align 8, !tbaa !11
  %39 = load i64, ptr %10, align 8, !tbaa !11
  %40 = sub nsw i64 %38, %39
  %41 = load ptr, ptr %4, align 8, !tbaa !5
  %42 = load i32, ptr %7, align 4, !tbaa !9
  %43 = load i32, ptr %6, align 4, !tbaa !9
  %44 = add nsw i32 %42, %43
  %45 = load i32, ptr %9, align 4, !tbaa !9
  %46 = add nsw i32 %44, %45
  %47 = sext i32 %46 to i64
  %48 = getelementptr inbounds i64, ptr %41, i64 %47
  store i64 %40, ptr %48, align 8, !tbaa !11
  %49 = load ptr, ptr %4, align 8, !tbaa !5
  %50 = load i32, ptr %7, align 4, !tbaa !9
  %51 = load i32, ptr %9, align 4, !tbaa !9
  %52 = add nsw i32 %50, %51
  %53 = sext i32 %52 to i64
  %54 = getelementptr inbounds i64, ptr %49, i64 %53
  %55 = load i64, ptr %54, align 8, !tbaa !11
  %56 = load i64, ptr %10, align 8, !tbaa !11
  %57 = add nsw i64 %55, %56
  %58 = load ptr, ptr %4, align 8, !tbaa !5
  %59 = load i32, ptr %7, align 4, !tbaa !9
  %60 = load i32, ptr %9, align 4, !tbaa !9
  %61 = add nsw i32 %59, %60
  %62 = sext i32 %61 to i64
  %63 = getelementptr inbounds i64, ptr %58, i64 %62
  store i64 %57, ptr %63, align 8, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #2
  br label %64

64:                                               ; preds = %22
  %65 = load i32, ptr %9, align 4, !tbaa !9
  %66 = add nsw i32 %65, 1
  store i32 %66, ptr %9, align 4, !tbaa !9
  br label %17, !llvm.loop !13

67:                                               ; preds = %21
  br label %68

68:                                               ; preds = %67
  %69 = load i32, ptr %6, align 4, !tbaa !9
  %70 = shl i32 %69, 1
  %71 = load i32, ptr %7, align 4, !tbaa !9
  %72 = add nsw i32 %71, %70
  store i32 %72, ptr %7, align 4, !tbaa !9
  br label %11, !llvm.loop !15

73:                                               ; preds = %15
  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 = !{!12, !12, i64 0}
!12 = !{!"long long", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = distinct !{!15, !14}


; 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(argmem: readwrite) uwtable
define dso_local void @_Z11FWT_iteratePxii(ptr nocapture noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp sgt i32 %1, 0
  %5 = icmp sgt i32 %2, 0
  %or.cond = and i1 %4, %5
  br i1 %or.cond, label %.preheader.us.preheader, label %._crit_edge29

.preheader.us.preheader:                          ; preds = %3
  %6 = shl nuw i32 %2, 1
  %7 = sext i32 %6 to i64
  %8 = zext nneg i32 %1 to i64
  %9 = zext nneg i32 %2 to i64
  %wide.trip.count = zext nneg i32 %2 to i64
  %invariant.gep35 = getelementptr i64, ptr %0, i64 %9
  %min.iters.check = icmp ult i32 %2, 4
  %n.vec = and i64 %wide.trip.count, 2147483644
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br label %.preheader.us

.preheader.us:                                    ; preds = %.preheader.us.preheader, %._crit_edge.us
  %indvars.iv32 = phi i64 [ 0, %.preheader.us.preheader ], [ %indvars.iv.next33, %._crit_edge.us ]
  %gep36 = getelementptr i64, ptr %invariant.gep35, i64 %indvars.iv32
  %invariant.gep = getelementptr i64, ptr %0, i64 %indvars.iv32
  br i1 %min.iters.check, label %scalar.ph.preheader, label %vector.body

vector.body:                                      ; preds = %.preheader.us, %vector.body
  %index = phi i64 [ %index.next, %vector.body ], [ 0, %.preheader.us ]
  %10 = getelementptr i64, ptr %gep36, i64 %index
  %11 = getelementptr i8, ptr %10, i64 16
  %wide.load = load <2 x i64>, ptr %10, align 8, !tbaa !5
  %wide.load37 = load <2 x i64>, ptr %11, align 8, !tbaa !5
  %12 = getelementptr i64, ptr %invariant.gep, i64 %index
  %13 = getelementptr i8, ptr %12, i64 16
  %wide.load38 = load <2 x i64>, ptr %12, align 8, !tbaa !5
  %wide.load39 = load <2 x i64>, ptr %13, align 8, !tbaa !5
  %14 = sub nsw <2 x i64> %wide.load38, %wide.load
  %15 = sub nsw <2 x i64> %wide.load39, %wide.load37
  store <2 x i64> %14, ptr %10, align 8, !tbaa !5
  store <2 x i64> %15, ptr %11, align 8, !tbaa !5
  %16 = add nsw <2 x i64> %wide.load38, %wide.load
  %17 = add nsw <2 x i64> %wide.load39, %wide.load37
  store <2 x i64> %16, ptr %12, align 8, !tbaa !5
  store <2 x i64> %17, ptr %13, align 8, !tbaa !5
  %index.next = add nuw i64 %index, 4
  %18 = icmp eq i64 %index.next, %n.vec
  br i1 %18, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  br i1 %cmp.n, label %._crit_edge.us, label %scalar.ph.preheader

scalar.ph.preheader:                              ; preds = %middle.block, %.preheader.us
  %indvars.iv.ph = phi i64 [ 0, %.preheader.us ], [ %n.vec, %middle.block ]
  br label %scalar.ph

scalar.ph:                                        ; preds = %scalar.ph.preheader, %scalar.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %scalar.ph ], [ %indvars.iv.ph, %scalar.ph.preheader ]
  %19 = getelementptr i64, ptr %gep36, i64 %indvars.iv
  %20 = load i64, ptr %19, align 8, !tbaa !5
  %gep = getelementptr i64, ptr %invariant.gep, i64 %indvars.iv
  %21 = load i64, ptr %gep, align 8, !tbaa !5
  %22 = sub nsw i64 %21, %20
  store i64 %22, ptr %19, align 8, !tbaa !5
  %23 = add nsw i64 %21, %20
  store i64 %23, ptr %gep, align 8, !tbaa !5
  %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.us, label %scalar.ph, !llvm.loop !13

._crit_edge.us:                                   ; preds = %scalar.ph, %middle.block
  %indvars.iv.next33 = add nsw i64 %indvars.iv32, %7
  %24 = icmp slt i64 %indvars.iv.next33, %8
  br i1 %24, label %.preheader.us, label %._crit_edge29, !llvm.loop !14

._crit_edge29:                                    ; preds = %._crit_edge.us, %3
  ret void
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(argmem: readwrite) 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 = !{!"long long", !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: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyCFGPass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass