47 lines
2.0 KiB
Diff
47 lines
2.0 KiB
Diff
From 1161177ce24da0348b5f6c6358667dc4a93f544b Mon Sep 17 00:00:00 2001
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Date: Thu, 17 Oct 2019 14:49:51 +0000
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Subject: [PATCH] disable UseLSE on ARMv8.1 by default
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Summary: <UseLSE>: disable UseLSE by default and set UseLSE to
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experimental
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LLT: java -XX:+UnlockExperimentalVMOptions -XX:+PrintFlagsFinal
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Bug url: NA
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---
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.../hotspot/src/cpu/aarch64/vm/globals_aarch64.hpp | 2 +-
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.../hotspot/src/cpu/aarch64/vm/vm_version_aarch64.cpp | 3 ++-
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2 files changed, 3 insertions(+), 2 deletions(-)
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diff --git a/hotspot/src/cpu/aarch64/vm/globals_aarch64.hpp b/hotspot/src/cpu/aarch64/vm/globals_aarch64.hpp
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index 8cdd5c498..e0749ff80 100644
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--- a/hotspot/src/cpu/aarch64/vm/globals_aarch64.hpp
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+++ b/hotspot/src/cpu/aarch64/vm/globals_aarch64.hpp
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@@ -87,7 +87,7 @@ define_pd_global(intx, InlineSmallCode, 1000);
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"Use Neon for CRC32 computation") \
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product(bool, UseCRC32, false, \
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"Use CRC32 instructions for CRC32 computation") \
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- product(bool, UseLSE, false, \
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+ experimental(bool, UseLSE, false, \
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"Use LSE instructions") \
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product(bool, UseSIMDForMemoryOps, false, \
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"Use SIMD instructions in generated memory move code") \
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diff --git a/hotspot/src/cpu/aarch64/vm/vm_version_aarch64.cpp b/hotspot/src/cpu/aarch64/vm/vm_version_aarch64.cpp
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index 65bdaa83a..35d1062c8 100644
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--- a/hotspot/src/cpu/aarch64/vm/vm_version_aarch64.cpp
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+++ b/hotspot/src/cpu/aarch64/vm/vm_version_aarch64.cpp
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@@ -203,10 +203,11 @@ void VM_Version::get_processor_features() {
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if (auxv & HWCAP_ATOMICS) {
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if (FLAG_IS_DEFAULT(UseLSE))
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- FLAG_SET_DEFAULT(UseLSE, true);
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+ FLAG_SET_DEFAULT(UseLSE, false);
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} else {
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if (UseLSE) {
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warning("UseLSE specified, but not supported on this CPU");
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+ FLAG_SET_DEFAULT(UseLSE, false);
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}
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}
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--
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2.19.0
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