; LLVM IR from bqi343/cp-notebook :: Contests/USACO Solutions/2014-15/Dec 2014 Gold/14 Dec G2.ll (Z9modifymaxii)

; 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"

@segmax = external dso_local global [200000 x i32], align 16

; Function Attrs: mustprogress uwtable
define dso_local void @_Z9modifymaxii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  %5 = load i32, ptr %4, align 4, !tbaa !5
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = add nsw i32 %6, 100000
  store i32 %7, ptr %3, align 4, !tbaa !5
  %8 = sext i32 %7 to i64
  %9 = getelementptr inbounds [200000 x i32], ptr @segmax, i64 0, i64 %8
  store i32 %5, ptr %9, align 4, !tbaa !5
  br label %10

10:                                               ; preds = %27, %2
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = icmp sgt i32 %11, 1
  br i1 %12, label %13, label %30

13:                                               ; preds = %10
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [200000 x i32], ptr @segmax, i64 0, i64 %15
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = xor i32 %17, 1
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [200000 x i32], ptr @segmax, i64 0, i64 %19
  %21 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %16, ptr noundef nonnull align 4 dereferenceable(4) %20)
  %22 = load i32, ptr %21, align 4, !tbaa !5
  %23 = load i32, ptr %3, align 4, !tbaa !5
  %24 = ashr i32 %23, 1
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds [200000 x i32], ptr @segmax, i64 0, i64 %25
  store i32 %22, ptr %26, align 4, !tbaa !5
  br label %27

27:                                               ; preds = %13
  %28 = load i32, ptr %3, align 4, !tbaa !5
  %29 = ashr i32 %28, 1
  store i32 %29, ptr %3, align 4, !tbaa !5
  br label %10, !llvm.loop !9

30:                                               ; preds = %10
  ret void
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #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 = { inlinehint 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 = !{!"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"

@segmax = external dso_local global [200000 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z9modifymaxii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = add nsw i32 %0, 100000
  %4 = sext i32 %3 to i64
  %5 = getelementptr inbounds [200000 x i32], ptr @segmax, i64 0, i64 %4
  store i32 %1, ptr %5, align 4, !tbaa !5
  %6 = icmp sgt i32 %0, -99999
  br i1 %6, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %2, %.lr.ph
  %.07 = phi i32 [ %14, %.lr.ph ], [ %3, %2 ]
  %7 = zext nneg i32 %.07 to i64
  %8 = getelementptr inbounds [200000 x i32], ptr @segmax, i64 0, i64 %7
  %9 = xor i32 %.07, 1
  %10 = zext nneg i32 %9 to i64
  %11 = getelementptr inbounds [200000 x i32], ptr @segmax, i64 0, i64 %10
  %12 = tail call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %8, ptr noundef nonnull align 4 dereferenceable(4) %11)
  %13 = load i32, ptr %12, align 4, !tbaa !5
  %14 = lshr i32 %.07, 1
  %15 = zext nneg i32 %14 to i64
  %16 = getelementptr inbounds [200000 x i32], ptr @segmax, i64 0, i64 %15
  store i32 %13, ptr %16, align 4, !tbaa !5
  %17 = icmp ugt i32 %.07, 3
  br i1 %17, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %2
  ret void
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #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 = { inlinehint 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 = !{!"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,GlobalOptPass,IPSCCPPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass