; LLVM IR from ahr9n/psolving-paradigms :: 4.dynamic-programming/12.strings/UVa 10617 - Again Palindrome.ll (Z3genii)

; 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"

%"class.std::__cxx11::basic_string" = type { %"struct.std::__cxx11::basic_string<char>::_Alloc_hider", i64, %union.anon }
%"struct.std::__cxx11::basic_string<char>::_Alloc_hider" = type { ptr }
%union.anon = type { i64, [8 x i8] }

@_Z1sB5cxx11 = external dso_local global %"class.std::__cxx11::basic_string", align 8
@dp = external dso_local global [65 x [65 x i64]], align 16

; Function Attrs: mustprogress uwtable
define dso_local noundef i64 @_Z3genii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i64, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  %8 = load i32, ptr %4, align 4, !tbaa !5
  %9 = load i32, ptr %5, align 4, !tbaa !5
  %10 = icmp sgt i32 %8, %9
  br i1 %10, label %11, label %12

11:                                               ; preds = %2
  store i64 0, ptr %3, align 8
  br label %73

12:                                               ; preds = %2
  %13 = load i32, ptr %4, align 4, !tbaa !5
  %14 = load i32, ptr %5, align 4, !tbaa !5
  %15 = icmp eq i32 %13, %14
  br i1 %15, label %16, label %17

16:                                               ; preds = %12
  store i64 1, ptr %3, align 8
  br label %73

17:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %18 = load i32, ptr %4, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [65 x [65 x i64]], ptr @dp, i64 0, i64 %19
  %21 = load i32, ptr %5, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [65 x i64], ptr %20, i64 0, i64 %22
  store ptr %23, ptr %6, align 8, !tbaa !9
  %24 = load ptr, ptr %6, align 8, !tbaa !9
  %25 = load i64, ptr %24, align 8, !tbaa !11
  %26 = xor i64 %25, -1
  %27 = icmp ne i64 %26, 0
  br i1 %27, label %28, label %31

28:                                               ; preds = %17
  %29 = load ptr, ptr %6, align 8, !tbaa !9
  %30 = load i64, ptr %29, align 8, !tbaa !11
  store i64 %30, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %72

31:                                               ; preds = %17
  %32 = load i32, ptr %4, align 4, !tbaa !5
  %33 = sext i32 %32 to i64
  %34 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z1sB5cxx11, i64 noundef %33)
  %35 = load i8, ptr %34, align 1, !tbaa !13
  %36 = sext i8 %35 to i32
  %37 = load i32, ptr %5, align 4, !tbaa !5
  %38 = sext i32 %37 to i64
  %39 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z1sB5cxx11, i64 noundef %38)
  %40 = load i8, ptr %39, align 1, !tbaa !13
  %41 = sext i8 %40 to i32
  %42 = icmp eq i32 %36, %41
  br i1 %42, label %43, label %55

43:                                               ; preds = %31
  %44 = load i32, ptr %4, align 4, !tbaa !5
  %45 = load i32, ptr %5, align 4, !tbaa !5
  %46 = sub nsw i32 %45, 1
  %47 = call noundef i64 @_Z3genii(i32 noundef %44, i32 noundef %46)
  %48 = add nsw i64 1, %47
  %49 = load i32, ptr %4, align 4, !tbaa !5
  %50 = add nsw i32 %49, 1
  %51 = load i32, ptr %5, align 4, !tbaa !5
  %52 = call noundef i64 @_Z3genii(i32 noundef %50, i32 noundef %51)
  %53 = add nsw i64 %48, %52
  %54 = load ptr, ptr %6, align 8, !tbaa !9
  store i64 %53, ptr %54, align 8, !tbaa !11
  store i64 %53, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %72

55:                                               ; preds = %31
  %56 = load i32, ptr %4, align 4, !tbaa !5
  %57 = load i32, ptr %5, align 4, !tbaa !5
  %58 = sub nsw i32 %57, 1
  %59 = call noundef i64 @_Z3genii(i32 noundef %56, i32 noundef %58)
  %60 = load i32, ptr %4, align 4, !tbaa !5
  %61 = add nsw i32 %60, 1
  %62 = load i32, ptr %5, align 4, !tbaa !5
  %63 = call noundef i64 @_Z3genii(i32 noundef %61, i32 noundef %62)
  %64 = add nsw i64 %59, %63
  %65 = load i32, ptr %4, align 4, !tbaa !5
  %66 = add nsw i32 %65, 1
  %67 = load i32, ptr %5, align 4, !tbaa !5
  %68 = sub nsw i32 %67, 1
  %69 = call noundef i64 @_Z3genii(i32 noundef %66, i32 noundef %68)
  %70 = sub nsw i64 %64, %69
  %71 = load ptr, ptr %6, align 8, !tbaa !9
  store i64 %70, ptr %71, align 8, !tbaa !11
  store i64 %70, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %72

72:                                               ; preds = %55, %43, %28
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  br label %73

73:                                               ; preds = %72, %16, %11
  %74 = load i64, ptr %3, align 8
  ret i64 %74
}

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

; Function Attrs: mustprogress nounwind uwtable
declare noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef) #2 align 2

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

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 = { 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 = { 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 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long long", !7, i64 0}
!13 = !{!7, !7, i64 0}


; 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"

%"class.std::__cxx11::basic_string" = type { %"struct.std::__cxx11::basic_string<char>::_Alloc_hider", i64, %union.anon }
%"struct.std::__cxx11::basic_string<char>::_Alloc_hider" = type { ptr }
%union.anon = type { i64, [8 x i8] }

@_Z1sB5cxx11 = external dso_local global %"class.std::__cxx11::basic_string", align 8
@dp = external dso_local local_unnamed_addr global [65 x [65 x i64]], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z3genii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp sgt i32 %0, %1
  br i1 %3, label %common.ret, label %4

4:                                                ; preds = %2
  %5 = icmp eq i32 %0, %1
  br i1 %5, label %common.ret, label %6

6:                                                ; preds = %4
  %7 = sext i32 %0 to i64
  %8 = sext i32 %1 to i64
  %9 = getelementptr inbounds [65 x [65 x i64]], ptr @dp, i64 0, i64 %7, i64 %8
  %10 = load i64, ptr %9, align 8, !tbaa !5
  %.not = icmp eq i64 %10, -1
  br i1 %.not, label %11, label %common.ret

11:                                               ; preds = %6
  %12 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z1sB5cxx11, i64 noundef %7)
  %13 = load i8, ptr %12, align 1, !tbaa !9
  %14 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) @_Z1sB5cxx11, i64 noundef %8)
  %15 = load i8, ptr %14, align 1, !tbaa !9
  %16 = icmp eq i8 %13, %15
  %17 = add nsw i32 %1, -1
  %18 = tail call noundef i64 @_Z3genii(i32 noundef %0, i32 noundef %17)
  br i1 %16, label %19, label %24

common.ret.sink.split:                            ; preds = %19, %24
  %.sink = phi i64 [ %29, %24 ], [ %23, %19 ]
  store i64 %.sink, ptr %9, align 8, !tbaa !5
  br label %common.ret

common.ret:                                       ; preds = %common.ret.sink.split, %2, %4, %6
  %common.ret.op = phi i64 [ 0, %2 ], [ 1, %4 ], [ %10, %6 ], [ %.sink, %common.ret.sink.split ]
  ret i64 %common.ret.op

19:                                               ; preds = %11
  %20 = add nsw i64 %18, 1
  %21 = add nsw i32 %0, 1
  %22 = tail call noundef i64 @_Z3genii(i32 noundef %21, i32 noundef %1)
  %23 = add nsw i64 %20, %22
  br label %common.ret.sink.split

24:                                               ; preds = %11
  %25 = add nsw i32 %0, 1
  %26 = tail call noundef i64 @_Z3genii(i32 noundef %25, i32 noundef %1)
  %27 = add nsw i64 %26, %18
  %28 = tail call noundef i64 @_Z3genii(i32 noundef %25, i32 noundef %17)
  %29 = sub i64 %27, %28
  br label %common.ret.sink.split
}

; Function Attrs: mustprogress nounwind uwtable
declare noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef) local_unnamed_addr #0 align 2

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" }

!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 = !{!7, !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass