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

[Dmitry Chuyko]

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)

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/attachments/20180216/4129b388/attachment.html>