; LLVM IR from VastoLorde95/Competitive-Programming :: Codeforces/278 Division 1/Problem B/B.ll (Z3geti)

; 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"

@s = external dso_local global i32, align 4

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z3mxqii(i32 noundef, i32 noundef) #1

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z3mnqii(i32 noundef, i32 noundef) #1

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z3geti(i32 noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 -1, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %6 = load i32, ptr %2, align 4, !tbaa !5
  store i32 %6, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  br label %7

7:                                                ; preds = %30, %1
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = add nsw i32 %8, 1
  %10 = load i32, ptr %4, align 4, !tbaa !5
  %11 = icmp slt i32 %9, %10
  br i1 %11, label %12, label %31

12:                                               ; preds = %7
  %13 = load i32, ptr %3, align 4, !tbaa !5
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = add nsw i32 %13, %14
  %16 = sdiv i32 %15, 2
  store i32 %16, ptr %5, align 4, !tbaa !5
  %17 = load i32, ptr %5, align 4, !tbaa !5
  %18 = load i32, ptr %2, align 4, !tbaa !5
  %19 = call noundef i32 @_Z3mxqii(i32 noundef %17, i32 noundef %18)
  %20 = load i32, ptr %5, align 4, !tbaa !5
  %21 = load i32, ptr %2, align 4, !tbaa !5
  %22 = call noundef i32 @_Z3mnqii(i32 noundef %20, i32 noundef %21)
  %23 = sub nsw i32 %19, %22
  %24 = load i32, ptr @s, align 4, !tbaa !5
  %25 = icmp sgt i32 %23, %24
  br i1 %25, label %26, label %28

26:                                               ; preds = %12
  %27 = load i32, ptr %5, align 4, !tbaa !5
  store i32 %27, ptr %3, align 4, !tbaa !5
  br label %30

28:                                               ; preds = %12
  %29 = load i32, ptr %5, align 4, !tbaa !5
  store i32 %29, ptr %4, align 4, !tbaa !5
  br label %30

30:                                               ; preds = %28, %26
  br label %7, !llvm.loop !9

31:                                               ; preds = %7
  %32 = load i32, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %32
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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"

@s = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z3mxqii(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z3mnqii(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local noundef range(i32 -2147483648, 1073741825) i32 @_Z3geti(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp sgt i32 %0, 0
  br i1 %2, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %1, %.lr.ph
  %.015 = phi i32 [ %..0, %.lr.ph ], [ -1, %1 ]
  %.01214 = phi i32 [ %.012., %.lr.ph ], [ %0, %1 ]
  %3 = add nsw i32 %.015, %.01214
  %4 = lshr i32 %3, 1
  %5 = tail call noundef i32 @_Z3mxqii(i32 noundef %4, i32 noundef %0)
  %6 = tail call noundef i32 @_Z3mnqii(i32 noundef %4, i32 noundef %0)
  %7 = sub nsw i32 %5, %6
  %8 = load i32, ptr @s, align 4, !tbaa !5
  %9 = icmp sgt i32 %7, %8
  %.012. = select i1 %9, i32 %.01214, i32 %4
  %..0 = select i1 %9, i32 %4, i32 %.015
  %10 = add nsw i32 %..0, 1
  %11 = icmp slt i32 %10, %.012.
  br i1 %11, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %1
  %.012.lcssa = phi i32 [ %0, %1 ], [ %.012., %.lr.ph ]
  ret i32 %.012.lcssa
}

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" }

!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,SROAPass,SimplifyCFGPass,TailCallElimPass