[jdk18] RFR: 8278948: compiler/vectorapi/reshape/TestVectorCastAVX1.java crashes in assembler [v2]

[Quan Anh Mai]

On Wed, 22 Dec 2021 20:13:05 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> AFAIK int vectors of size 256 bit are not supported on AVX1 so we cannot cast from int vectors to float vectors of size 256 anyway. So it is essentially the same.
>
> x86 docs say that `vcvtdq2ps` is AVX1 instruction:
> ![image](https://user-images.githubusercontent.com/5215794/147149423-10988f8d-9bcd-41ca-b728-bc2c34e3bd35.png)

Hi, while the instruction is supported in hardware, the VM does not support the vector shape. As a result, there should not be a situation where we have a vector node with that shape on AVX1. Thank you very much.

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

PR: https://git.openjdk.java.net/jdk18/pull/46