From 1161177ce24da0348b5f6c6358667dc4a93f544b Mon Sep 17 00:00:00 2001 From: guoge Date: Thu, 17 Oct 2019 14:49:51 +0000 Subject: [PATCH] disable UseLSE on ARMv8.1 by default Summary: : 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 65bdaa83a..35d1062c8 100644 --- a/hotspot/src/cpu/aarch64/vm/vm_version_aarch64.cpp +++ b/hotspot/src/cpu/aarch64/vm/vm_version_aarch64.cpp @@ -203,10 +203,11 @@ 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