RFR: 8365911: AArch64: Fix encoding error in sve_cpy for negative floats [v2]

[Andrew Haley]

On Wed, 3 Sep 2025 08:23:32 GMT, erifan <duke at openjdk.org> wrote:

>> src/hotspot/cpu/aarch64/assembler_aarch64.hpp line 3819:
>> 
>>> 3817:     if (isFloat) {
>>> 3818:       assert(T != B, "invalid size");
>>> 3819:       assert((imm8 >> 8) == 0, "invalid immediate");
>> 
>> Suggestion:
>> 
>>       assert((imm8 & 0xff) == 0, "invalid immediate");
>> 
>> To match line 3819.
>
> This may not be the case, `imm8 >> 8` doesn't equal to `imm8 & 0xff`

What is the range of values you're trying to test?

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PR Review Comment: https://git.openjdk.org/jdk/pull/26951#discussion_r2318194266