; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/cp/chopsticks.ll (Z5pairsSt6vectorIiSaIiEEii)

; 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 @_Z5pairsSt6vectorIiSaIiEEii(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
  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
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  store i32 0, ptr %8, align 4, !tbaa !9
  br label %9

9:                                                ; preds = %36, %3
  %10 = load i32, ptr %8, align 4, !tbaa !9
  %11 = load i32, ptr %6, align 4, !tbaa !9
  %12 = sub nsw i32 %11, 1
  %13 = icmp slt i32 %10, %12
  br i1 %13, label %15, label %14

14:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  br label %37

15:                                               ; preds = %9
  %16 = load i32, ptr %8, align 4, !tbaa !9
  %17 = add nsw i32 %16, 1
  %18 = sext i32 %17 to i64
  %19 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %18) #2
  %20 = load i32, ptr %19, align 4, !tbaa !9
  %21 = load i32, ptr %8, align 4, !tbaa !9
  %22 = sext i32 %21 to i64
  %23 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %22) #2
  %24 = load i32, ptr %23, align 4, !tbaa !9
  %25 = sub nsw i32 %20, %24
  %26 = load i32, ptr %5, align 4, !tbaa !9
  %27 = icmp sle i32 %25, %26
  br i1 %27, label %28, label %33

28:                                               ; preds = %15
  %29 = load i32, ptr %7, align 4, !tbaa !9
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr %7, align 4, !tbaa !9
  %31 = load i32, ptr %8, align 4, !tbaa !9
  %32 = add nsw i32 %31, 2
  store i32 %32, ptr %8, align 4, !tbaa !9
  br label %36

33:                                               ; preds = %15
  %34 = load i32, ptr %8, align 4, !tbaa !9
  %35 = add nsw i32 %34, 1
  store i32 %35, ptr %8, align 4, !tbaa !9
  br label %36

36:                                               ; preds = %33, %28
  br label %9, !llvm.loop !11

37:                                               ; preds = %14
  %38 = load i32, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret i32 %38
}

; 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 dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #0 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 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"}


; 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 i32 @_Z5pairsSt6vectorIiSaIiEEii(ptr noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = add nsw i32 %2, -1
  %5 = icmp sgt i32 %2, 1
  br i1 %5, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph, %3
  %.09.lcssa = phi i32 [ 0, %3 ], [ %.110, %.lr.ph ]
  ret i32 %.09.lcssa

.lr.ph:                                           ; preds = %3, %.lr.ph
  %.012 = phi i32 [ %.1, %.lr.ph ], [ 0, %3 ]
  %.0911 = phi i32 [ %.110, %.lr.ph ], [ 0, %3 ]
  %6 = add nsw i32 %.012, 1
  %7 = sext i32 %6 to i64
  %8 = tail call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %7) #1
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = sext i32 %.012 to i64
  %11 = tail call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %10) #1
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %13 = sub nsw i32 %9, %12
  %.not = icmp sle i32 %13, %1
  %14 = add nsw i32 %.012, 2
  %15 = zext i1 %.not to i32
  %.110 = add nuw nsw i32 %.0911, %15
  %.1 = select i1 %.not, i32 %14, i32 %6
  %16 = icmp slt i32 %.1, %4
  br i1 %16, label %.lr.ph, label %._crit_edge, !llvm.loop !9
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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