; LLVM IR from plskz/competitive-programming :: Google/Code Jam 2021/Qualification Round 2021/Reversort_Engineering.ll (Z3getPii)

; 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 @_Z3getPii(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
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = 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) #4
  store i32 0, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #4
  store i32 1, ptr %6, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %69, %2
  %12 = load i32, ptr %6, align 4, !tbaa !9
  %13 = load i32, ptr %4, align 4, !tbaa !9
  %14 = sub nsw i32 %13, 1
  %15 = icmp sle i32 %12, %14
  br i1 %15, label %17, label %16

16:                                               ; preds = %11
  store i32 2, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #4
  br label %72

17:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #4
  %18 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %18, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #4
  %19 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %19, ptr %9, align 4, !tbaa !9
  br label %20

20:                                               ; preds = %41, %17
  %21 = load i32, ptr %9, align 4, !tbaa !9
  %22 = load i32, ptr %4, align 4, !tbaa !9
  %23 = icmp sle i32 %21, %22
  br i1 %23, label %25, label %24

24:                                               ; preds = %20
  store i32 5, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #4
  br label %44

25:                                               ; preds = %20
  %26 = load ptr, ptr %3, align 8, !tbaa !5
  %27 = load i32, ptr %6, align 4, !tbaa !9
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds i32, ptr %26, i64 %28
  %30 = load i32, ptr %29, align 4, !tbaa !9
  %31 = load ptr, ptr %3, align 8, !tbaa !5
  %32 = load i32, ptr %9, align 4, !tbaa !9
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds i32, ptr %31, i64 %33
  %35 = load i32, ptr %34, align 4, !tbaa !9
  %36 = icmp sgt i32 %30, %35
  br i1 %36, label %37, label %40

37:                                               ; preds = %25
  %38 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %8, ptr noundef nonnull align 4 dereferenceable(4) %9)
  %39 = load i32, ptr %38, align 4, !tbaa !9
  store i32 %39, ptr %8, align 4, !tbaa !9
  br label %40

40:                                               ; preds = %37, %25
  br label %41

41:                                               ; preds = %40
  %42 = load i32, ptr %9, align 4, !tbaa !9
  %43 = add nsw i32 %42, 1
  store i32 %43, ptr %9, align 4, !tbaa !9
  br label %20, !llvm.loop !11

44:                                               ; preds = %24
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #4
  %45 = load ptr, ptr %3, align 8, !tbaa !5
  %46 = load ptr, ptr %3, align 8, !tbaa !5
  %47 = load ptr, ptr %3, align 8, !tbaa !5
  %48 = load i32, ptr %4, align 4, !tbaa !9
  %49 = sext i32 %48 to i64
  %50 = getelementptr inbounds i32, ptr %47, i64 %49
  %51 = call noundef ptr @_ZSt4findIPiiET_S1_S1_RKT0_(ptr noundef %46, ptr noundef %50, ptr noundef nonnull align 4 dereferenceable(4) %8)
  %52 = call noundef i64 @_ZSt8distanceIPiENSt15iterator_traitsIT_E15difference_typeES2_S2_(ptr noundef %45, ptr noundef %51)
  %53 = trunc i64 %52 to i32
  store i32 %53, ptr %10, align 4, !tbaa !9
  %54 = load i32, ptr %10, align 4, !tbaa !9
  %55 = load i32, ptr %6, align 4, !tbaa !9
  %56 = sub nsw i32 %54, %55
  %57 = add nsw i32 %56, 1
  %58 = load i32, ptr %5, align 4, !tbaa !9
  %59 = add nsw i32 %58, %57
  store i32 %59, ptr %5, align 4, !tbaa !9
  %60 = load ptr, ptr %3, align 8, !tbaa !5
  %61 = load i32, ptr %6, align 4, !tbaa !9
  %62 = sext i32 %61 to i64
  %63 = getelementptr inbounds i32, ptr %60, i64 %62
  %64 = load ptr, ptr %3, align 8, !tbaa !5
  %65 = load i32, ptr %10, align 4, !tbaa !9
  %66 = sext i32 %65 to i64
  %67 = getelementptr inbounds i32, ptr %64, i64 %66
  %68 = getelementptr inbounds i32, ptr %67, i64 1
  call void @_ZSt7reverseIPiEvT_S1_(ptr noundef %63, ptr noundef %68)
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #4
  br label %69

69:                                               ; preds = %44
  %70 = load i32, ptr %6, align 4, !tbaa !9
  %71 = add nsw i32 %70, 1
  store i32 %71, ptr %6, align 4, !tbaa !9
  br label %11, !llvm.loop !13

72:                                               ; preds = %16
  %73 = load i32, ptr %5, align 4, !tbaa !9
  store i32 1, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #4
  ret i32 %73
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef i64 @_ZSt8distanceIPiENSt15iterator_traitsIT_E15difference_typeES2_S2_(ptr noundef, ptr noundef) #3

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef ptr @_ZSt4findIPiiET_S1_S1_RKT0_(ptr noundef, ptr noundef, ptr noundef nonnull align 4 dereferenceable(4)) #3

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_ZSt7reverseIPiEvT_S1_(ptr noundef, ptr noundef) #3

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 = { inlinehint 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 #3 = { inlinehint 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 #4 = { 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 uwtable
define dso_local noundef i32 @_Z3getPii(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %invariant.gep = getelementptr i8, ptr %0, i64 4
  %.not.not24 = icmp sgt i32 %1, 1
  br i1 %.not.not24, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %2
  %5 = zext nneg i32 %1 to i64
  %6 = getelementptr inbounds i32, ptr %0, i64 %5
  br label %7

._crit_edge:                                      ; preds = %10, %2
  %.0.lcssa = phi i32 [ 0, %2 ], [ %15, %10 ]
  ret i32 %.0.lcssa

7:                                                ; preds = %.lr.ph, %10
  %indvars.iv = phi i64 [ 1, %.lr.ph ], [ %indvars.iv.next, %10 ]
  %.026 = phi i32 [ 0, %.lr.ph ], [ %15, %10 ]
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #4
  %8 = trunc nuw nsw i64 %indvars.iv to i32
  store i32 %8, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #4
  store i32 %8, ptr %4, align 4, !tbaa !5
  %9 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  br label %17

10:                                               ; preds = %26
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #4
  %11 = call noundef ptr @_ZSt4findIPiiET_S1_S1_RKT0_(ptr noundef nonnull %0, ptr noundef nonnull %6, ptr noundef nonnull align 4 dereferenceable(4) %3)
  %12 = call noundef i64 @_ZSt8distanceIPiENSt15iterator_traitsIT_E15difference_typeES2_S2_(ptr noundef nonnull %0, ptr noundef %11)
  %13 = trunc i64 %12 to i32
  %reass.sub = sub i32 %.026, %8
  %14 = add i32 %reass.sub, 1
  %15 = add i32 %14, %13
  %sext = shl i64 %12, 32
  %16 = ashr exact i64 %sext, 30
  %gep = getelementptr i8, ptr %invariant.gep, i64 %16
  call void @_ZSt7reverseIPiEvT_S1_(ptr noundef nonnull %9, ptr noundef nonnull %gep)
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #4
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %5
  br i1 %exitcond.not, label %._crit_edge, label %7, !llvm.loop !9

17:                                               ; preds = %7, %26
  %storemerge23 = phi i32 [ %8, %7 ], [ %28, %26 ]
  %18 = load i32, ptr %9, align 4, !tbaa !5
  %19 = sext i32 %storemerge23 to i64
  %20 = getelementptr inbounds i32, ptr %0, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %22 = icmp sgt i32 %18, %21
  br i1 %22, label %23, label %26

23:                                               ; preds = %17
  %24 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %3, ptr noundef nonnull align 4 dereferenceable(4) %4)
  %25 = load i32, ptr %24, align 4, !tbaa !5
  store i32 %25, ptr %3, align 4, !tbaa !5
  %.pre = load i32, ptr %4, align 4, !tbaa !5
  br label %26

26:                                               ; preds = %17, %23
  %27 = phi i32 [ %storemerge23, %17 ], [ %.pre, %23 ]
  %28 = add nsw i32 %27, 1
  store i32 %28, ptr %4, align 4, !tbaa !5
  %.not.not27 = icmp slt i32 %27, %1
  br i1 %.not.not27, label %17, label %10, !llvm.loop !11
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef i64 @_ZSt8distanceIPiENSt15iterator_traitsIT_E15difference_typeES2_S2_(ptr noundef, ptr noundef) local_unnamed_addr #3

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef ptr @_ZSt4findIPiiET_S1_S1_RKT0_(ptr noundef, ptr noundef, ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #3

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_ZSt7reverseIPiEvT_S1_(ptr noundef, ptr noundef) local_unnamed_addr #3

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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { inlinehint 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 #3 = { inlinehint 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 #4 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


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