8324824: AArch64: Detect Ampere-1B core and update default options fo…

…r Ampere CPUs Backport-of: 9936aeea32b71509151099e6d28905e0322b2bc2
openjdk · Mar 1, 2024 · 4243aed · 4243aed · openjdk-notifier · Mar 1, 2024
1 parent e667521
commit 4243aed
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Showing 2 changed files with 12 additions and 3 deletions.
diff --git a/src/hotspot/cpu/aarch64/vm_version_aarch64.cpp b/src/hotspot/cpu/aarch64/vm_version_aarch64.cpp
@@ -144,11 +144,19 @@ void VM_Version::initialize() {
     }
   }
 
-  // Ampere CPUs: Ampere-1 and Ampere-1A
-  if (_cpu == CPU_AMPERE && ((_model == CPU_MODEL_AMPERE_1) || (_model == CPU_MODEL_AMPERE_1A))) {
+  // Ampere CPUs
+  if (_cpu == CPU_AMPERE && ((_model == CPU_MODEL_AMPERE_1)  ||
+                             (_model == CPU_MODEL_AMPERE_1A) ||
+                             (_model == CPU_MODEL_AMPERE_1B))) {
     if (FLAG_IS_DEFAULT(UseSIMDForMemoryOps)) {
       FLAG_SET_DEFAULT(UseSIMDForMemoryOps, true);
     }
+    if (FLAG_IS_DEFAULT(OnSpinWaitInst)) {
+      FLAG_SET_DEFAULT(OnSpinWaitInst, "isb");
+    }
+    if (FLAG_IS_DEFAULT(OnSpinWaitInstCount)) {
+      FLAG_SET_DEFAULT(OnSpinWaitInstCount, 2);
+    }
   }
 
   // ThunderX

diff --git a/src/hotspot/cpu/aarch64/vm_version_aarch64.hpp b/src/hotspot/cpu/aarch64/vm_version_aarch64.hpp
@@ -110,7 +110,8 @@ enum Ampere_CPU_Model {
     CPU_MODEL_ALTRA     = 0xd0c, /* CPU implementer is CPU_ARM, Neoverse N1 */
     CPU_MODEL_ALTRAMAX  = 0xd0c, /* CPU implementer is CPU_ARM, Neoverse N1 */
     CPU_MODEL_AMPERE_1  = 0xac3, /* CPU implementer is CPU_AMPERE */
-    CPU_MODEL_AMPERE_1A = 0xac4  /* CPU implementer is CPU_AMPERE */
+    CPU_MODEL_AMPERE_1A = 0xac4, /* CPU implementer is CPU_AMPERE */
+    CPU_MODEL_AMPERE_1B = 0xac5  /* AMPERE_1B core Implements ARMv8.7 with CSSC, MTE, SM3/SM4 extensions */
 };
 
 #define CPU_FEATURE_FLAGS(decl)               \