[vectorIntrinsics] RFR: 8261108: Add cast nodes from integer types to float types implementation for Arm SVE

[Wang Huang]

On Thu, 18 Feb 2021 03:26:00 GMT, Ningsheng Jian <njian at openjdk.org> wrote:

>> Add the backend codegen for nodes like castb2f / castb2d / casts2f / casts2d / casti2f / casti2d / castl2f / castl2d.
>> 
>> * add `sve_scvtf`  ( and `sve_ucvtf`) encoding
>> * add mock for these instructions
>> * add `VECTOR_CAST_I2F_EXTEND[N]` and `VECTOR_CAST_I2F`
>> 
>> Thank you for your review.
>
> src/hotspot/cpu/aarch64/aarch64_sve.ad line 2728:
> 
>> 2726:             n->bottom_type()->is_vect()->element_basic_type() == T_DOUBLE);
>> 2727:   match(Set dst (VectorCastB2X src));
>> 2728:   effect(TEMP_DEF dst);
> 
> This effect looks unnecessary to me.

OK. I will remove that.

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PR: https://git.openjdk.java.net/panama-vector/pull/37