RFR: JDK-8216437 : PPC64: Add intrinsic for GHASH algorithm [v20]

[Martin Doerr]

On Mon, 10 Feb 2025 14:27:54 GMT, Suchismith Roy <sroy at openjdk.org> wrote:

>> src/hotspot/cpu/ppc/stubGenerator_ppc.cpp line 661:
>> 
>>> 659:     __ andi(temp1, data, 15);
>>> 660:     __ cmpwi(CR0, temp1, 0);
>>> 661:     __ beq(CR0, L_aligned);                    // Check if address is aligned (mask lower 4 bits)
>> 
>> The alignment check should not be in the loop. Better check before and use 2 loops.
>> It would be interesting to know how often the data is aligned.
>
> You mean 1 loop for aligned address and one for unaligned ? Is there a way to write the common code of both in a function ?

Yes, you can move the common code into a static function and pass the masm, Registers, etc.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20235#discussion_r1949356411