[vectorIntrinsics] RFR: 8261108: Add cast nodes from integer types to float types implementation for Arm SVE [v2]

[Ningsheng Jian]

On Fri, 19 Feb 2021 08:49:00 GMT, Wang Huang <whuang at openjdk.org> wrote:

>> src/hotspot/cpu/aarch64/assembler_aarch64.hpp line 3385:
>> 
>>> 3383:     pgrf(Pg, 10), rf(Zn, 5), rf(Zd, 0);                                 \
>>> 3384:     encode_cvtf_T(T_dst, T_src);                                        \
>>> 3385:     f(T_dst, 23, 22), f(T_src, 18, 17);                                 \
>> 
>> I would suggest to fill the bits in order, i.e. move f(T_dst, 23, 22) right after (... 31, 24), and then (21, 19), (18, 17)...
>
> `T_dst` and `T_src` will be changed after  `encode_cvtf_T`, so they cannot move there.

I think it's fine to assign the values at the beginning. And maybe you can add more test cases to check different combinations.

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