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

[Bhavana Kilambi]

On Fri, 1 Aug 2025 09:51:21 GMT, Andrew Haley <aph 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_vector.ad line 4903:
> 
>> 4901: 
>> 4902: // Replicate a 16-bit half precision float which is within the limits
>> 4903: // as specified for the operand - immH8_shift8
> 
> Suggestion:
> 
> // for the operand - immH8_shift8

Done

> src/hotspot/cpu/aarch64/assembler_aarch64.cpp line 439:
> 
>> 437: bool Assembler::operand_valid_for_sve_dup_immediate(int64_t imm) {
>> 438:   return ((imm <= 127 && imm >= -128) ||
>> 439:           (imm <= 32767 && imm >= -32768 && (imm & 0xff) == 0));
> 
> Suggestion:
> 
>   return ((imm >= -128 && imm <= 127) ||
>           (imm & 0xff == 0) && (imm >= -32768 && imm <= 32767));
> 
> Reason: it's more conventional, and closer to the mathematical _l ≤ x  ≤ h_.

Done

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

PR Review Comment: https://git.openjdk.org/jdk/pull/26589#discussion_r2259530180
PR Review Comment: https://git.openjdk.org/jdk/pull/26589#discussion_r2259529427