RFR: 8329035: New Data Destination instructions support [v6]

[Steve Dohrmann]

On Wed, 11 Sep 2024 23:02:41 GMT, Steve Dohrmann <sdohrmann at openjdk.org> wrote:

>> Adds assembler support for APX New Data Destination (NDD) and No Flags (NF) features.  
>> 
>> The NDD feature is supported by new functions that take an additional destination-only register operand.  If the instruction also supports NF, a no_flags boolean parameter is present. To use these instructions with NF behavior, but without NDD semantics, the same register can be supplied for both the new destination and the (first) source operand.
>> 
>> Some instructions support NF but not NDD.  These instructions have a new function that just adds a boolean no_flags parameter.  Existing functions were not overloaded with a boolean here because of  signature collisions (bool / int) with functions that take immediate operands.
>> 
>> All of the new functions have a letter "e" prefix, to avoid signature collisions and to indicate they will be evex encoded.
>
> Steve Dohrmann has updated the pull request incrementally with one additional commit since the last revision:
> 
>   xorw and long-line changes based on review comments

Thank you reviewers for your helpful and timely comments!

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

PR Comment: https://git.openjdk.org/jdk/pull/20698#issuecomment-2346687781