[11] RFR(XS) 8209735: Disable avx512 by default

[Igor Veresov]

Looks good.

igor



> On Aug 20, 2018, at 10:50 AM, Vladimir Kozlov <vladimir.kozlov at oracle.com> 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.
> 
> -- 
> Thanks,
> Vladimir

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