; LLVM IR from Leet-Us-Code/DSA-A-Z-Practice :: Sid's Levels/Level - 3/Arrays/Minimum Difference.ll (Z11justSmallerSt6vectorIiSaIiEEi)

; 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 @_Z11justSmallerSt6vectorIiSaIiEEi(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
  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) #2
  store i32 0, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %9 = call noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %0) #2
  %10 = sub i64 %9, 1
  %11 = trunc i64 %10 to i32
  store i32 %11, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 -1, ptr %7, align 4, !tbaa !9
  br label %12

12:                                               ; preds = %34, %2
  %13 = load i32, ptr %6, align 4, !tbaa !9
  %14 = load i32, ptr %5, align 4, !tbaa !9
  %15 = icmp sge i32 %13, %14
  br i1 %15, label %16, label %35

16:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %17 = load i32, ptr %6, align 4, !tbaa !9
  %18 = load i32, ptr %5, align 4, !tbaa !9
  %19 = add nsw i32 %17, %18
  %20 = sdiv i32 %19, 2
  store i32 %20, ptr %8, 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 = load i32, ptr %4, align 4, !tbaa !9
  %26 = icmp sle i32 %24, %25
  br i1 %26, label %27, label %31

27:                                               ; preds = %16
  %28 = load i32, ptr %8, align 4, !tbaa !9
  store i32 %28, ptr %7, align 4, !tbaa !9
  %29 = load i32, ptr %8, align 4, !tbaa !9
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr %5, align 4, !tbaa !9
  br label %34

31:                                               ; preds = %16
  %32 = load i32, ptr %8, align 4, !tbaa !9
  %33 = sub nsw i32 %32, 1
  store i32 %33, ptr %6, align 4, !tbaa !9
  br label %34

34:                                               ; preds = %31, %27
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  br label %12, !llvm.loop !11

35:                                               ; preds = %12
  %36 = load i32, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret i32 %36
}

; 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 i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) #0 align 2

; 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 range(i32 -1, 1073741824) i32 @_Z11justSmallerSt6vectorIiSaIiEEi(ptr noundef nonnull %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = tail call noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %0) #1
  %4 = trunc i64 %3 to i32
  %5 = add i32 %4, -1
  %.not15 = icmp slt i32 %5, 0
  br i1 %.not15, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %.lr.ph
  %.018 = phi i32 [ %.1, %.lr.ph ], [ 0, %2 ]
  %.01017 = phi i32 [ %.111, %.lr.ph ], [ -1, %2 ]
  %.01216 = phi i32 [ %.113, %.lr.ph ], [ %5, %2 ]
  %6 = add nuw nsw i32 %.018, %.01216
  %7 = lshr i32 %6, 1
  %8 = zext nneg i32 %7 to i64
  %9 = tail call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %8) #1
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %.not14 = icmp sgt i32 %10, %1
  %11 = add nuw nsw i32 %7, 1
  %12 = add nsw i32 %7, -1
  %.113 = select i1 %.not14, i32 %12, i32 %.01216
  %.111 = select i1 %.not14, i32 %.01017, i32 %7
  %.1 = select i1 %.not14, i32 %.018, i32 %11
  %.not = icmp slt i32 %.113, %.1
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %2
  %.010.lcssa = phi i32 [ -1, %2 ], [ %.111, %.lr.ph ]
  ret i32 %.010.lcssa
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

; 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: GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass