[jdk16] RFR: 8260339: JVM crashes when executing PhaseIdealLoop::match_fill_loop

[Jie Fu]

On Tue, 26 Jan 2021 02:01:00 GMT, Wang Huang <whuang at openjdk.org> wrote:

> The reason is :
> 
>   BasicType t = store->as_Mem()->memory_type();
>   const char* fill_name;
>   if (msg == NULL &&
>       StubRoutines::select_fill_function(t, false, fill_name) == NULL) {
>     msg = "unsupported store";
>     msg_node = store;
>   }
> 
> If the `store` is a `StoreVectorNode` ,the `BasicType` is `T_VOID`. It seems that we don't need to intrinsify a `StoreVectorNode` filling here.
> 
> I add a new case here to avoid mistake:
>   case T_NARROWOOP:
>   case T_NARROWKLASS:
>   case T_ADDRESS:
> +  case T_VOID:
>     // Currently unsupported
>     return NULL;

> Hi @Wanghuang-Huawei , I'm still not clear how to reproduce the bug.
> 

Ah, I missed the attachment in the JBS.
Thumbs-up @Wanghuang-Huawei .

-------------

PR: https://git.openjdk.java.net/jdk16/pull/132