[10] RFR(XS) 8185013: Disable subword vector analysis optimization until 8184995 is fixed

[Vladimir Kozlov]

Thank you, Dan.

I think one reviewer is enough for this. I am pushing it.

Vladimir

On 7/20/17 3:47 PM, Daniel D. Daugherty wrote:
> Thumbs up!
> 
> Dan
> 
> 
> On 7/20/17 4:44 PM, Vladimir Kozlov wrote:
>> https://bugs.openjdk.java.net/browse/JDK-8185013
>>
>> Switch UseSubwordForMaxVector flag off by default.
>>
>> src/share/vm/opto/c2_globals.hpp
>> @@ -192,7 +192,7 @@
>>            "of rounds of unroll,optimize,..")                          \
>>            range(0, max_jint)                                          \
>>                                                                        \
>> -  product(bool, UseSubwordForMaxVector, true,                         \
>> +  product(bool, UseSubwordForMaxVector, false,                        \
>>            "Use Subword Analysis to set maximum vector size")          \
>>                                                                        \
>>    develop(intx, UnrollLimitForProfileCheck, 1,                        \
>>
>> Thanks,
>> Vladimir
>