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

[Vladimir Kozlov]

On Sat, 18 Dec 2021 02:15:00 GMT, Quan Anh Mai <duke at openjdk.java.net> wrote:

> This patch fixes a crash spotted in `compiler/vectorapi/reshape/TestVectorCastAVX1.java` in mainline. The reason for the failure is the incorrect vector encoding of integer promotion operation leads to unsupported instruction `vpmovsxbd/vpmovsxwd ymm, xmm` on AVX1. For the same reason we currently cannot cast a short or byte vector to a 256-bit float vector on AVX1, so I also fixed that.

@merykitty  please, add comment in bug report how to reproduced it and how failure looks like.
We do run AVX1 testing with these tests and I did not see failure.

@jatin-bhateja or @sviswa7 please look on it.

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