RFR: 8310949: RISC-V: Initialize UseUnalignedAccesses [v3]

[Ludovic Henry]

On Wed, 28 Jun 2023 08:32:26 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Ludovic Henry has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fixup! 8310949: RISC-V: Initialize UseUnalignedAccesses
>
> Hey, there is a block before this in the same file:
> 
> 
>  if (FLAG_IS_DEFAULT(AvoidUnalignedAccesses)) {
>     if (unaligned_access.value() != MISALIGNED_FAST) {
>       FLAG_SET_DEFAULT(AvoidUnalignedAccesses, true);
>     } else {
>       FLAG_SET_DEFAULT(AvoidUnalignedAccesses, false);
>     }
> }
> 
> 
> ...which needs to be reconciled with this one? At very least, it shows that it is possible to sense `MISALIGNED_FAST`.

@shipilev sounds good! Let's only enable `UseUnalignedAccesses` on platform that support fast unaligned accesses. We should use `unaligned_access.value() == MISALIGNED_FAST` to set it up IMO.

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PR Comment: https://git.openjdk.org/jdk/pull/14676#issuecomment-1610996609