RFR: 8361582: AArch64: Some ConH values cannot be replicated with SVE [v3]

[Bhavana Kilambi]

On Fri, 1 Aug 2025 11:50:13 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Bhavana Kilambi has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Addressed review comments
>
> src/hotspot/cpu/aarch64/aarch64.ad line 4377:
> 
>> 4375: operand immI8_shift8()
>> 4376: %{
>> 4377:   predicate(Assembler::operand_valid_for_sve_dup_immediate((int64_t)n->get_int()));
> 
> `Assembler::operand_valid_for_sve_dup_immediate` sounds odd as the predicate for a generically sounding `immI8_shift8`. These operands are only used in `replicate` rules, though. So we might be taking precedent from immIAddSubV` rule:
> 
> 
> // 32 bit integer valid for vector add sub immediate
> operand immIAddSubV()
> %{
>   predicate(Assembler::operand_valid_for_sve_add_sub_immediate((int64_t)n->get_int()));
>   match(ConI);
> 
>   op_cost(0);
>   format %{ %}
>   interface(CONST_INTER);
> %}
> 
> 
> I.e. rename these operands to `immIDupV`, `immLDupV`, `immHDupV` and adjust the comments to match?

Done

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

PR Review Comment: https://git.openjdk.org/jdk/pull/26589#discussion_r2259528646