RFR 8249893: AARCH64: optimize the construction of the value from the bits of the other two

[Boris Ulasevich]

Hi,

gently reminding of this review request.

thanks,
Boris

On 24.07.2020 13:48, Boris Ulasevich wrote:
> Hi,
>
> Please review the change to C2 and AArch64 which reduces constructs
> like  "(v1 & 0xFF) | ((v2 & 0xFF) << 8)" into two Bitfield Insert 
> instructions.
>
> http://bugs.openjdk.java.net/browse/JDK-8249893
> http://cr.openjdk.java.net/~bulasevich/8249893/webrev.00
>
> The change in common code was made to enable Node::is_AndL method.
> The method in the rule predicate is required to find out if we are within
> the straight or reversed rule (ADLC adds rule with swapped parameters
> for commutative operands).
>
> Tested with JTREG and generated [1] tests.
>
> thanks,
> Boris
>
> [1] http://cr.openjdk.java.net/~bulasevich/8249893/webrev.00/Gen.java