Support for AES on ppc64le

[Vladimir Kozlov]

Hi Hiroshi

About library_call.cpp changes.

You don't need GraphKit::

And you can use load_array_element() instead:

Node* objAESCryptKey = load_array_element(control(), objSessionK, 
intcon(0), TypeAryPtr::OOPS);

You may need additional check and cast because next expression expects 
the objAESCryptKey points to int[]:

Node* k_start = array_element_address(objAESCryptKey, intcon(0), T_INT);

Thanks,
Vladimir

On 3/14/16 9:34 AM, Hiroshi H Horii wrote:
> Dear all:
>
> Can I please request reviews for the following change?
> This change was created for JDK 9.
>
> Description:
> This change adds stub routines support for single-block AES encryption and
> decryption operations on the POWER8 platform. They are available only when
> the application is configured to use SunJCE crypto provider on little
> endian.
> These stubs make use of efficient hardware AES instructions and thus
> offer significant performance improvements over JITed code on POWER8
> as on x86 and SPARC. AES stub routines are enabled by default on POWER8
> platforms that support AES instructions (vcipher). They can be
> explicitly enabled or
> disabled on the command-line using UseAES and UseAESIntrinsics JVM flags.
> Unlike x86 and SPARC, vcipher and vnchiper of POWER8 need the same round
> keys of AES. Therefore, inline_aescrypt_Block in library_call.cpp calls
> the stub with
> AESCrypt.sessionK[0] as round keys.
>
> Summary of source code changes:
>
>   *src/cpu/ppc/vm/assembler_ppc.hpp
>   *src/cpu/ppc/vm/assembler_ppc.inline.hpp
>     - Adds support for vrld instruction to rotate vector register values
> with
>        left doubleword.
>
>   *src/cpu/ppc/vm/stubGenerator_ppc.cpp
>     - Defines stubs for single-block AES encryption and decryption routines
>        supporting all key sizes (128-bit, 192-bit and 256-bit).
>     - Current POWER AES decryption instructions are not compatible with
>        SunJCE expanded decryption key format. Thus decryption stubs read
>        the expanded encryption keys (sessionK[0]) with descendant order.
>     - Encryption stubs use SunJCE expanded encryption key as their is
>        no incompatibility issue between POWER8 AES encryption instructions
>        and SunJCE expanded encryption keys.
>
>   *src/cpu/ppc/vm/vm_version_ppc.cpp
>     - Detects AES capabilities of the underlying CPU by using has_vcipher().
>     - Enables UseAES and UseAESIntrinsics flags if the underlying CPU
>        supports AES instructions and neither of them is explicitly
> disabled on
>        the command-line. Generate warning message if either of these
> flags are
>        enabled on the command-line whereas the underlying CPU does not
> support
>        AES instructions.
>
>   *src/share/vm/opto/library_call.cpp
>      - Passes the first input parameter, reference to sessionK[0] to the
> AES stubs
>         only on the POWER platform.
>
> Code change:
>     Please see an attached diff file that was generated with "hg diff
> -g" under
>     the latest hotspot directory.
>
> Passed tests:
>    jtreg compiler/codegen/7184394/
>    jtreg compiler/cpuflags/ (after removing @ignored annotation)
>
> * This is my first post of a change. I'm sorry in advance if I don't
> follow the
>     community manners.
>
> * I wrote this description based on the follows.
> http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2013-November/012670.html
>
>
>
> Regards,
> Hiroshi
> -----------------------
> Hiroshi Horii,
> IBM Research - Tokyo
>