; LLVM IR from abhisheknaiidu/dsa :: DSA/Strings (longest-pallindromic-sbstr)

; 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 @_Z6helperNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEii(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
  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
  br label %7

7:                                                ; preds = %29, %3
  %8 = load i32, ptr %5, align 4, !tbaa !9
  %9 = icmp sge i32 %8, 0
  br i1 %9, label %10, label %27

10:                                               ; preds = %7
  %11 = load i32, ptr %6, align 4, !tbaa !9
  %12 = sext i32 %11 to i64
  %13 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #2
  %14 = icmp ult i64 %12, %13
  br i1 %14, label %15, label %27

15:                                               ; preds = %10
  %16 = load i32, ptr %5, align 4, !tbaa !9
  %17 = sext i32 %16 to i64
  %18 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %17)
  %19 = load i8, ptr %18, align 1, !tbaa !11
  %20 = sext i8 %19 to i32
  %21 = load i32, ptr %6, align 4, !tbaa !9
  %22 = sext i32 %21 to i64
  %23 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %22)
  %24 = load i8, ptr %23, align 1, !tbaa !11
  %25 = sext i8 %24 to i32
  %26 = icmp eq i32 %20, %25
  br label %27

27:                                               ; preds = %15, %10, %7
  %28 = phi i1 [ false, %10 ], [ false, %7 ], [ %26, %15 ]
  br i1 %28, label %29, label %34

29:                                               ; preds = %27
  %30 = load i32, ptr %5, align 4, !tbaa !9
  %31 = add nsw i32 %30, -1
  store i32 %31, ptr %5, align 4, !tbaa !9
  %32 = load i32, ptr %6, align 4, !tbaa !9
  %33 = add nsw i32 %32, 1
  store i32 %33, ptr %6, align 4, !tbaa !9
  br label %7, !llvm.loop !12

34:                                               ; preds = %27
  %35 = load i32, ptr %6, align 4, !tbaa !9
  %36 = load i32, ptr %5, align 4, !tbaa !9
  %37 = sub nsw i32 %35, %36
  %38 = sub nsw i32 %37, 1
  ret i32 %38
}

; Function Attrs: mustprogress nounwind uwtable
declare noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32)) #1 align 2

; 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) #1 align 2

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 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 #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 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


; 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 nounwind uwtable
define dso_local noundef range(i32 -2147483648, 2147483647) i32 @_Z6helperNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEii(ptr noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp sgt i32 %1, -1
  br i1 %4, label %.lr.ph.preheader, label %.critedge

.lr.ph.preheader:                                 ; preds = %3
  %5 = sext i32 %2 to i64
  %6 = zext nneg i32 %1 to i64
  %7 = add i32 %2, %1
  %8 = add i32 %7, 1
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %17
  %indvars.iv19 = phi i64 [ %6, %.lr.ph.preheader ], [ %indvars.iv.next20, %17 ]
  %indvars.iv = phi i64 [ %5, %.lr.ph.preheader ], [ %indvars.iv.next, %17 ]
  %9 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #1
  %10 = icmp ugt i64 %9, %indvars.iv
  br i1 %10, label %11, label %.critedge.loopexit.split.loop.exit

11:                                               ; preds = %.lr.ph
  %12 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %indvars.iv19)
  %13 = load i8, ptr %12, align 1, !tbaa !5
  %14 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %indvars.iv)
  %15 = load i8, ptr %14, align 1, !tbaa !5
  %16 = icmp eq i8 %13, %15
  br i1 %16, label %17, label %.critedge.loopexit.split.loop.exit27

17:                                               ; preds = %11
  %indvars.iv.next20 = add nsw i64 %indvars.iv19, -1
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %18 = icmp sgt i64 %indvars.iv19, 0
  br i1 %18, label %.lr.ph, label %.critedge, !llvm.loop !8

.critedge.loopexit.split.loop.exit:               ; preds = %.lr.ph
  %19 = trunc nsw i64 %indvars.iv to i32
  %20 = trunc nuw nsw i64 %indvars.iv19 to i32
  br label %.critedge

.critedge.loopexit.split.loop.exit27:             ; preds = %11
  %21 = trunc nsw i64 %indvars.iv to i32
  %22 = trunc nuw nsw i64 %indvars.iv19 to i32
  br label %.critedge

.critedge:                                        ; preds = %17, %.critedge.loopexit.split.loop.exit, %.critedge.loopexit.split.loop.exit27, %3
  %.08.lcssa = phi i32 [ %1, %3 ], [ %20, %.critedge.loopexit.split.loop.exit ], [ %22, %.critedge.loopexit.split.loop.exit27 ], [ -1, %17 ]
  %.0.lcssa = phi i32 [ %2, %3 ], [ %19, %.critedge.loopexit.split.loop.exit ], [ %21, %.critedge.loopexit.split.loop.exit27 ], [ %8, %17 ]
  %23 = xor i32 %.08.lcssa, -1
  %24 = add i32 %.0.lcssa, %23
  ret i32 %24
}

; Function Attrs: mustprogress nounwind uwtable
declare noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32)) local_unnamed_addr #0 align 2

; 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" }
attributes #1 = { 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass