RFR(M) 8152496: Blended code generation

[Aleksey Shipilev]

On 03/24/2016 08:55 PM, Christian Thalinger wrote:
>> On Mar 24, 2016, at 7:50 AM, Berg, Michael C <michael.c.berg at intel.com
>> <mailto:michael.c.berg at intel.com>> wrote:
>>
>> Hi All,
>>
>> I would like to contribute blended code generation.  On EVEX enabled
>> platforms that have sufficient CPUID support, it is a boon to mix code
>> generation to keep size manageable when emitting EVEX code, we can
>> migrate compatible versions to AVX when resources allow, this enables
>> an uplift of as much as 12% on known metrics such as those in
>> SpecJvm2008. Reportable score uplift on a base run is enhanced
>> nominally by 6%.
>> These changes uplift performance via 64-bit and 32-bit code generation
>> generically wherever scalar or vector SIMD is present.

Oh wow.

>> Bug-id: https://bugs.openjdk.java.net/browse/JDK-8152496 
>> webrev:
>> http://cr.openjdk.java.net/~mcberg/8152496/webrev.01/
>> <http://cr.openjdk.java.net/%7Emcberg/8152496/webrev.01/>

This is suspicious, should be 0x79?
  6187     emit_int8(79)

Only x86_32.ad changes, no x86_64.ad?

is_managed is cryptic, and probably deserves a comment.

Thanks,
-Aleksey

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