RFR: 8287835: Add support for additional float/double to integral conversion for x86 [v5]

[Sandhya Viswanathan]

On Fri, 10 Jun 2022 03:22:19 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

>> D2X in general needs AVX 512 due to evcvttpd2qq.
>
> Thanks @sviswa7 , for AVX we can use VCVTTPD2DQ to cast double precison lane to integer and subsequently to sub  words lanes. For casting to long we  do not have direct instruction.

Thanks @jatin-bhateja. I have updated the RFE (https://bugs.openjdk.org/browse/JDK-8288043) to include this.

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PR: https://git.openjdk.org/jdk/pull/9032