RFR: 8288043: Optimize FP to word/sub-word integral type conversion on X86 AVX2 platforms [v4]

[Jatin Bhateja]

On Fri, 7 Oct 2022 00:06:20 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

>>> Could you please enable the compiler/vectorapi/VectorFPtoIntCastTest.java for AVX2 platforms? Currently they are only run for AVX512DQ platforms.
>> 
>> I have added missing casting cases AVX/AVX2 and AVX512 targets in existing comprehensive test for [casting](test/hotspot/jtreg/compiler/vectorapi/reshape/utils/TestCastMethods.java.)
>
> @jatin-bhateja Rest of the changes look good to me. Mainly the vector_op_pre_select_sz_estimate() needs to be corrected.

Thanks @sviswa7 and @vnkozlov.

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

PR: https://git.openjdk.org/jdk/pull/9748