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From 9dbf60065bbc841d1eea360719c6c666f39d35d3 Mon Sep 17 00:00:00 2001
Date: Fri, 22 Jan 2021 11:29:27 +0800
Subject: disable UseLSE on ARMv8.1 by default
Summary: <UseLSE>: disable UseLSE by default and set UseLSE to
experimental
LLT: java -XX:+UnlockExperimentalVMOptions -XX:+PrintFlagsFinal
Bug url: NA
---
hotspot/src/cpu/aarch64/vm/globals_aarch64.hpp | 2 +-
hotspot/src/cpu/aarch64/vm/vm_version_aarch64.cpp | 3 ++-
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/hotspot/src/cpu/aarch64/vm/globals_aarch64.hpp b/hotspot/src/cpu/aarch64/vm/globals_aarch64.hpp
index 8cdd5c498..e0749ff80 100644
--- a/hotspot/src/cpu/aarch64/vm/globals_aarch64.hpp
+++ b/hotspot/src/cpu/aarch64/vm/globals_aarch64.hpp
@@ -87,7 +87,7 @@ define_pd_global(intx, InlineSmallCode, 1000);
"Use Neon for CRC32 computation") \
product(bool, UseCRC32, false, \
"Use CRC32 instructions for CRC32 computation") \
- product(bool, UseLSE, false, \
+ experimental(bool, UseLSE, false, \
"Use LSE instructions") \
product(bool, UseSIMDForMemoryOps, false, \
"Use SIMD instructions in generated memory move code") \
diff --git a/hotspot/src/cpu/aarch64/vm/vm_version_aarch64.cpp b/hotspot/src/cpu/aarch64/vm/vm_version_aarch64.cpp
index 0bd2e0a54..78e6f1144 100644
--- a/hotspot/src/cpu/aarch64/vm/vm_version_aarch64.cpp
+++ b/hotspot/src/cpu/aarch64/vm/vm_version_aarch64.cpp
@@ -202,10 +202,11 @@ void VM_Version::get_processor_features() {
if (auxv & HWCAP_ATOMICS) {
if (FLAG_IS_DEFAULT(UseLSE))
- FLAG_SET_DEFAULT(UseLSE, true);
+ FLAG_SET_DEFAULT(UseLSE, false);
} else {
if (UseLSE) {
warning("UseLSE specified, but not supported on this CPU");
+ FLAG_SET_DEFAULT(UseLSE, false);
}
}
--
2.19.0
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