47 lines
2.0 KiB
Diff
47 lines
2.0 KiB
Diff
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
|
|
|