From 29fa7700db8e7a23a5a9a074a469bf3bcc07df81 Mon Sep 17 00:00:00 2001
From: Zhiru Zhu <zhiru.zhu@zilliz.com>
Date: Wed, 27 Nov 2019 15:03:05 +0800
Subject: [PATCH 1/2] add avx flags when building faiss

---
 core/src/index/cmake/ThirdPartyPackagesCore.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/src/index/cmake/ThirdPartyPackagesCore.cmake b/core/src/index/cmake/ThirdPartyPackagesCore.cmake
index 1a22a9d2be..fb698cdf13 100644
--- a/core/src/index/cmake/ThirdPartyPackagesCore.cmake
+++ b/core/src/index/cmake/ThirdPartyPackagesCore.cmake
@@ -708,7 +708,7 @@ macro(build_faiss)
     set(FAISS_CONFIGURE_ARGS
             "--prefix=${FAISS_PREFIX}"
             "CFLAGS=${EP_C_FLAGS}"
-            "CXXFLAGS=${EP_CXX_FLAGS}"
+            "CXXFLAGS=${EP_CXX_FLAGS} -mavx2 -mf16c"
             --without-python)
 
     if (FAISS_WITH_MKL)

From 9f1f76b1d41193a2e9246b42795036993e3911a4 Mon Sep 17 00:00:00 2001
From: Zhiru Zhu <zhiru.zhu@zilliz.com>
Date: Wed, 27 Nov 2019 15:07:22 +0800
Subject: [PATCH 2/2] update CHANGELOG

---
 CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7083cc12eb..5c7740de26 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,6 +30,7 @@ Please mark all change in change log and use the ticket from JIRA.
 - \#532 - assigin value to `table_name` from confest shell
 - \#533 - NSG build failed with MetricType Inner Product
 - \#543 - client raise exception in shards when search results is empty
+- \#497 - CPU-version search performance decreased 
 
 ## Feature
 - \#12 - Pure CPU version for Milvus