[vectorIntrinsics] RFR: 8259536: Add cast nodes between interger types implementation for Arm SVE [v2]

[Xiaohong Gong]

On Mon, 18 Jan 2021 03:24:02 GMT, Wang Huang <whuang at openjdk.org> wrote:

>> This patch add cast nodes between interger types implementation for Arm SVE like  "VectorCastB2X" "VectorCastI2X " "VectorCastS2X" "VectorCastL2X".
>
> Wang Huang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix build bug on other archs caused by UseSVE > 0

src/hotspot/share/opto/vectorIntrinsics.cpp line 338:

> 336:     if (C->print_intrinsics()) {
> 337:       tty->print_cr("  ** shuffle iota not supported on SVE");
> 338:     }

I guess these parts will be removed in future if shuffle is supported with SVE. Could you please add some comments for it?

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PR: https://git.openjdk.java.net/panama-vector/pull/31