[11] RFR(XS) 8209735: Disable avx512 by default
Vladimir Kozlov
vladimir.kozlov at oracle.com
Mon Aug 20 21:06:57 UTC 2018
Thank you, Eric
Vladimir
On 8/20/18 1:53 PM, Eric Caspole wrote:
> Hi Vladimir,
> Looks good.
> Eric
>
>
> On 08/20/2018 01:50 PM, Vladimir Kozlov wrote:
>> https://bugs.openjdk.java.net/browse/JDK-8209735
>>
>> I found several issues with avx512 code. Some are listed in bug report.
>> At this later time I suggest to switch off avx512 in JDK 11:
>>
>> diff -r 7339b9e38182 src/hotspot/cpu/x86/globals_x86.hpp
>> --- a/src/hotspot/cpu/x86/globals_x86.hpp
>> +++ b/src/hotspot/cpu/x86/globals_x86.hpp
>> @@ -119,7 +119,7 @@
>> product(bool, UseStoreImmI16, true, \
>> "Use store immediate 16-bits value instruction on x86") \
>> \
>> - product(intx, UseAVX, 3, \
>> + product(intx, UseAVX, 2, \
>> "Highest supported AVX instructions set on x86/x64") \
>> range(0, 99) \
>>
>> Tested tier1,hs-tier2.
>>
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