; LLVM IR from tangjz/acm-icpc :: hdu/5865.ll (Z7mod_incRiii)

; 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"

@pw3 = external dso_local global [13 x i32], align 16

; 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 nounwind uwtable
define dso_local void @_Z7mod_incRiii(ptr noundef nonnull align 4 dereferenceable(4) %0, i32 noundef %1, i32 noundef %2) #1 {
  %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
  %9 = 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
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = load i32, ptr %10, align 4, !tbaa !9
  store i32 %11, ptr %8, align 4, !tbaa !9
  br label %12

12:                                               ; preds = %35, %3
  %13 = load i32, ptr %5, align 4, !tbaa !9
  %14 = icmp ne i32 %13, 0
  br i1 %14, label %16, label %15

15:                                               ; preds = %12
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  br label %42

16:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %17 = load i32, ptr %8, align 4, !tbaa !9
  %18 = load i32, ptr %5, align 4, !tbaa !9
  %19 = load i32, ptr %6, align 4, !tbaa !9
  %20 = mul nsw i32 %18, %19
  %21 = add nsw i32 %17, %20
  %22 = srem i32 %21, 3
  %23 = load i32, ptr %8, align 4, !tbaa !9
  %24 = srem i32 %23, 3
  %25 = sub nsw i32 %22, %24
  store i32 %25, ptr %9, align 4, !tbaa !9
  %26 = load i32, ptr %9, align 4, !tbaa !9
  %27 = load i32, ptr %7, align 4, !tbaa !9
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds [13 x i32], ptr @pw3, i64 0, i64 %28
  %30 = load i32, ptr %29, align 4, !tbaa !9
  %31 = mul nsw i32 %26, %30
  %32 = load ptr, ptr %4, align 8, !tbaa !5
  %33 = load i32, ptr %32, align 4, !tbaa !9
  %34 = add nsw i32 %33, %31
  store i32 %34, ptr %32, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  br label %35

35:                                               ; preds = %16
  %36 = load i32, ptr %7, align 4, !tbaa !9
  %37 = add nsw i32 %36, 1
  store i32 %37, ptr %7, align 4, !tbaa !9
  %38 = load i32, ptr %8, align 4, !tbaa !9
  %39 = sdiv i32 %38, 3
  store i32 %39, ptr %8, align 4, !tbaa !9
  %40 = load i32, ptr %5, align 4, !tbaa !9
  %41 = sdiv i32 %40, 3
  store i32 %41, ptr %5, align 4, !tbaa !9
  br label %12, !llvm.loop !11

42:                                               ; preds = %15
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = 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"

@pw3 = external dso_local local_unnamed_addr global [13 x i32], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind memory(read, argmem: readwrite, inaccessiblemem: none) uwtable
define dso_local void @_Z7mod_incRiii(ptr nocapture noundef nonnull align 4 dereferenceable(4) %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %.not13 = icmp eq i32 %1, 0
  br i1 %.not13, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %3
  %4 = load i32, ptr %0, align 4, !tbaa !5
  br label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %3
  ret void

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %.lr.ph ]
  %.016 = phi i32 [ %1, %.lr.ph.preheader ], [ %16, %.lr.ph ]
  %.01115 = phi i32 [ %4, %.lr.ph.preheader ], [ %15, %.lr.ph ]
  %5 = phi i32 [ %4, %.lr.ph.preheader ], [ %14, %.lr.ph ]
  %6 = mul nsw i32 %.016, %2
  %7 = add nsw i32 %6, %.01115
  %8 = srem i32 %7, 3
  %9 = srem i32 %.01115, 3
  %10 = sub nsw i32 %8, %9
  %11 = getelementptr inbounds [13 x i32], ptr @pw3, i64 0, i64 %indvars.iv
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %13 = mul nsw i32 %12, %10
  %14 = add nsw i32 %5, %13
  store i32 %14, ptr %0, align 4, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %15 = sdiv i32 %.01115, 3
  %16 = sdiv i32 %.016, 3
  %.016.off = add i32 %.016, 2
  %.not = icmp ult i32 %.016.off, 5
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(read, argmem: readwrite, inaccessiblemem: none) 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: GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass