[11] RFR (XS): JDK-8198293: AARCH64 - Add CPU detection code for Cavium Thunder X2

[Dmitry Chuyko]

rfe link corrected: https://bugs.openjdk.java.net/browse/JDK-8198293

On 02/16/2018 07:35 PM, Dmitry Chuyko wrote:
>
> Hello,
>
> Please review a small change in vendor specific features for Cavium CPUs.
>
> T88 should be determined more accurate with its model number.
> T99 may have 2 vendor-model combinations.
>
> Flag values for T99 are raw first approximation, I've created a 
> separate sub-task to check them more precisely.
>
> rfe: https://bugs.openjdk.java.net/browse/JDK-8198293
> patch: below
>
> -Dmitry
>
> diff -r 82d9d5744e5f src/hotspot/cpu/aarch64/vm_version_aarch64.cpp
> --- a/src/hotspot/cpu/aarch64/vm_version_aarch64.cpp    Fri Feb 16 
> 12:18:09 2018 +0100
> +++ b/src/hotspot/cpu/aarch64/vm_version_aarch64.cpp    Fri Feb 16 
> 19:15:44 2018 +0300
> @@ -193,7 +193,9 @@
>    }
>
>    // Enable vendor specific features
> -  if (_cpu == CPU_CAVIUM) {
> +
> +  // ThunderX
> +  if (_cpu == CPU_CAVIUM && (_model == 0xA1)) {
>      if (_variant == 0) _features |= CPU_DMB_ATOMICS;
>      if (FLAG_IS_DEFAULT(AvoidUnalignedAccesses)) {
>        FLAG_SET_DEFAULT(AvoidUnalignedAccesses, true);
> @@ -202,6 +204,20 @@
>        FLAG_SET_DEFAULT(UseSIMDForMemoryOps, (_variant > 0));
>      }
>    }
> +  // ThunderX2
> +  if ((_cpu == CPU_CAVIUM && (_model == 0xAF)) ||
> +      (_cpu == CPU_BROADCOM && (_model == 0x516))) {
> +    if (FLAG_IS_DEFAULT(AvoidUnalignedAccesses)) {
> +      FLAG_SET_DEFAULT(AvoidUnalignedAccesses, true);
> +    }
> +    if (FLAG_IS_DEFAULT(UseSIMDForMemoryOps)) {
> +      FLAG_SET_DEFAULT(UseSIMDForMemoryOps, true);
> +    }
> +    if (FLAG_IS_DEFAULT(UseFPUForSpilling)) {
> +      FLAG_SET_DEFAULT(UseFPUForSpilling, true);
> +    }
> +  }
> +
>    if (_cpu == CPU_ARM && (_model == 0xd03 || _model2 == 0xd03)) 
> _features |= CPU_A53MAC;
>    if (_cpu == CPU_ARM && (_model == 0xd07 || _model2 == 0xd07)) 
> _features |= CPU_STXR_PREFETCH;
>    // If an olde style /proc/cpuinfo (cpu_lines == 1) then if _model 
> is an A57 (0xd07)
>

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