; LLVM IR from xuxping/codelife :: algorthms/dp (rodcut)

; 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: nounwind uwtable
define dso_local i32 @rodcutByRecursive(i32 noundef %0, ptr noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !9
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = icmp sle i32 %9, 0
  br i1 %10, label %14, label %11

11:                                               ; preds = %2
  %12 = load ptr, ptr %5, align 8, !tbaa !9
  %13 = icmp eq ptr %12, null
  br i1 %13, label %14, label %15

14:                                               ; preds = %11, %2
  store i32 0, ptr %3, align 4
  br label %48

15:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 1, ptr %7, align 4, !tbaa !5
  br label %16

16:                                               ; preds = %43, %15
  %17 = load i32, ptr %7, align 4, !tbaa !5
  %18 = load i32, ptr %4, align 4, !tbaa !5
  %19 = icmp sle i32 %17, %18
  br i1 %19, label %21, label %20

20:                                               ; preds = %16
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  br label %46

21:                                               ; preds = %16
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %22 = load ptr, ptr %5, align 8, !tbaa !9
  %23 = load i32, ptr %7, align 4, !tbaa !5
  %24 = sub nsw i32 %23, 1
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds i32, ptr %22, i64 %25
  %27 = load i32, ptr %26, align 4, !tbaa !5
  %28 = load i32, ptr %4, align 4, !tbaa !5
  %29 = load i32, ptr %7, align 4, !tbaa !5
  %30 = sub nsw i32 %28, %29
  %31 = load ptr, ptr %5, align 8, !tbaa !9
  %32 = call i32 @rodcutByRecursive(i32 noundef %30, ptr noundef %31)
  %33 = add nsw i32 %27, %32
  store i32 %33, ptr %8, align 4, !tbaa !5
  %34 = load i32, ptr %8, align 4, !tbaa !5
  %35 = load i32, ptr %6, align 4, !tbaa !5
  %36 = icmp sgt i32 %34, %35
  br i1 %36, label %37, label %39

37:                                               ; preds = %21
  %38 = load i32, ptr %8, align 4, !tbaa !5
  br label %41

39:                                               ; preds = %21
  %40 = load i32, ptr %6, align 4, !tbaa !5
  br label %41

41:                                               ; preds = %39, %37
  %42 = phi i32 [ %38, %37 ], [ %40, %39 ]
  store i32 %42, ptr %6, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  br label %43

43:                                               ; preds = %41
  %44 = load i32, ptr %7, align 4, !tbaa !5
  %45 = add nsw i32 %44, 1
  store i32 %45, ptr %7, align 4, !tbaa !5
  br label %16, !llvm.loop !11

46:                                               ; preds = %20
  %47 = load i32, ptr %6, align 4, !tbaa !5
  store i32 %47, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %48

48:                                               ; preds = %46, %14
  %49 = load i32, ptr %3, align 4
  ret i32 %49
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !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: nofree nosync nounwind memory(argmem: read) uwtable
define dso_local i32 @rodcutByRecursive(i32 noundef %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = icmp slt i32 %0, 1
  %4 = icmp eq ptr %1, null
  %or.cond = or i1 %3, %4
  br i1 %or.cond, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %2
  %invariant.gep = getelementptr i8, ptr %1, i64 -4
  %5 = add nuw i32 %0, 1
  %wide.trip.count = zext i32 %5 to i64
  br label %6

6:                                                ; preds = %.preheader, %6
  %indvars.iv = phi i64 [ 1, %.preheader ], [ %indvars.iv.next, %6 ]
  %.01720 = phi i32 [ 0, %.preheader ], [ %12, %6 ]
  %gep = getelementptr i32, ptr %invariant.gep, i64 %indvars.iv
  %7 = load i32, ptr %gep, align 4, !tbaa !5
  %8 = trunc i64 %indvars.iv to i32
  %9 = sub i32 %0, %8
  %10 = tail call i32 @rodcutByRecursive(i32 noundef %9, ptr noundef nonnull %1)
  %11 = add nsw i32 %10, %7
  %12 = tail call i32 @llvm.smax.i32(i32 %11, i32 %.01720)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %.loopexit, label %6, !llvm.loop !9

.loopexit:                                        ; preds = %6, %2
  %.0 = phi i32 [ 0, %2 ], [ %12, %6 ]
  ret i32 %.0
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smax.i32(i32, i32) #1

attributes #0 = { nofree nosync nounwind memory(argmem: read) 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 speculatable willreturn memory(none) }

!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/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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