RFR: 8319872: AArch64: [vectorapi] Implementation of unsigned (zero extended) casts [v3]

[Andrew Haley]

On Wed, 22 Nov 2023 02:18:32 GMT, Eric Liu <eliu at openjdk.org> wrote:

>> src/hotspot/cpu/aarch64/c2_MacroAssembler_aarch64.cpp line 1412:
>> 
>>> 1410:       _sve_xunpk(is_unsigned, /* is_high */ false, dst, S, dst);
>>> 1411:       _sve_xunpk(is_unsigned, /* is_high */ false, dst, D, dst);
>>> 1412:       break;
>> 
>> Why is this change here? It doesn't do anything. Does it?
>
> `is_unsigned` is also used in this function. It is used in VectorUCastNode for zero extending.

Ah, I see.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16670#discussion_r1401721522