RFR: 8340093: C2 SuperWord: implement cost model [v3]

[Emanuel Peter]

On Tue, 4 Nov 2025 17:09:05 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Emanuel Peter has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   More comments for SirYwell
>
> src/hotspot/share/opto/superword.cpp line 1910:
> 
>> 1908: #ifndef PRODUCT
>> 1909:     if (_trace._info) {
>> 1910:       tty->print_cr("\nForced bailout of vectorization (AutoVectorizationOverrideProfitability=0).");
> 
> Side note. Consider separate RFE to change this to UL for such outputs.

Absolutely. The tricky part is that the current `TraceAutoVectorization` is a compile command that can be enabled with method name filtering. Is that already available via UL now?

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PR Review Comment: https://git.openjdk.org/jdk/pull/27803#discussion_r2491382314