diff --git a/.travis.yml b/.travis.yml
index 3f917ce72..bde0e202d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -211,44 +211,48 @@ matrix:
 
     - &test-macos
       os: osx
-      osx_image: xcode10.1
+      osx_image: xcode11.5
       before_script:
         - COMMON_FLAGS="DYNAMIC_ARCH=1 NUM_THREADS=32"
-        - brew update
-        - brew install gcc@8 # for gfortran
       script:
         - travis_wait 45 make QUIET_MAKE=1 $COMMON_FLAGS $BTYPE
       env:
-        - BTYPE="TARGET=NEHALEM BINARY=64 INTERFACE64=1 FC=gfortran-8"
+        - BTYPE="TARGET=NEHALEM BINARY=64 INTERFACE64=1 FC=gfortran-9"
 
     - <<: *test-macos
       osx_image: xcode12
       before_script:
         - COMMON_FLAGS="DYNAMIC_ARCH=1 NUM_THREADS=32"
         - brew update
-        - brew install gcc@10 # for gfortran
+        - brew install gcc@10
       script:
         - travis_wait 45 make QUIET_MAKE=1 $COMMON_FLAGS $BTYPE
       env:
         - BTYPE="TARGET=NEHALEM BINARY=64 INTERFACE64=1 FC=gfortran-10"
         
-    - <<: *test-macos
-      osx_image: xcode10.0
-      env:
-        - BTYPE="TARGET=NEHALEM BINARY=32 NOFORTRAN=1"
+  #  - <<: *test-macos
+  #    osx_image: xcode10
+  #    env:
+  #      - BTYPE="TARGET=NEHALEM BINARY=32 NOFORTRAN=1"
 
     - <<: *test-macos
-      osx_image: xcode10.1
+      osx_image: xcode11.5
+      before_script:
+        - COMMON_FLAGS="DYNAMIC_ARCH=1 NUM_THREADS=32"
+        - brew update
       env:
-        - CC="/Applications/Xcode-10.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang"
-        - CFLAGS="-O2 -Wno-macro-redefined -isysroot /Applications/Xcode-10.1.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.1.sdk -arch arm64 -miphoneos-version-min=10.0"
+#        - CC="/Applications/Xcode-10.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang"
+#        - CFLAGS="-O2 -Wno-macro-redefined -isysroot /Applications/Xcode-10.1.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.1.sdk -arch arm64 -miphoneos-version-min=10.0"
+        - CC="/Applications/Xcode-11.5.GM.Seed.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang"
+        - CFLAGS="-O2 -Wno-macro-redefined -isysroot /Applications/Xcode-11.5.GM.Seed.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.5.sdk -arch arm64 -miphoneos-version-min=10.0"
         - BTYPE="TARGET=ARMV8 BINARY=64 HOSTCC=clang NOFORTRAN=1"
-
     - <<: *test-macos
-      osx_image: xcode10.1
+      osx_image: xcode11.5
       env:
-        - CC="/Applications/Xcode-10.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang"
-        - CFLAGS="-O2 -mno-thumb -Wno-macro-redefined -isysroot /Applications/Xcode-10.1.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.1.sdk -arch armv7 -miphoneos-version-min=5.1"
+#        - CC="/Applications/Xcode-10.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang"
+#        - CFLAGS="-O2 -mno-thumb -Wno-macro-redefined -isysroot /Applications/Xcode-10.1.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.1.sdk -arch armv7 -miphoneos-version-min=5.1"
+        - CC="/Applications/Xcode-11.5.GM.Seed.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang"
+        - CFLAGS="-O2 -mno-thumb -Wno-macro-redefined -isysroot /Applications/Xcode-11.5.GM.Seed.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.5.sdk -arch armv7 -miphoneos-version-min=5.1"
         - BTYPE="TARGET=ARMV7 HOSTCC=clang NOFORTRAN=1"
 
     - &test-graviton2
diff --git a/Makefile.system b/Makefile.system
index afc8ee207..b5974f872 100644
--- a/Makefile.system
+++ b/Makefile.system
@@ -1561,6 +1561,7 @@ export KERNELDIR
 export FUNCTION_PROFILE
 export TARGET_CORE
 export NO_AVX512
+export NO_AVX2
 export BUILD_BFLOAT16
 
 export SBGEMM_UNROLL_M
diff --git a/Makefile.x86 b/Makefile.x86
index f310f4973..0e27264d8 100644
--- a/Makefile.x86
+++ b/Makefile.x86
@@ -59,9 +59,11 @@ LIBATLAS	= -L$(ATLASPATH)/32 -lcblas -lf77blas -latlas -lm
 else
 LIBATLAS	= -L$(ATLASPATH)/32 -lptf77blas -lptatlas -lpthread -lm
 endif
-
+ifdef HAVE_SSE2
+CCOMMON_OPT += -msse2
+FCOMMON_OPT += -msse2
+endif
 ifdef HAVE_SSE3
-ifndef DYNAMIC_ARCH
 CCOMMON_OPT += -msse3
 FCOMMON_OPT += -msse3
 ifdef HAVE_SSSE3
@@ -73,5 +75,4 @@ CCOMMON_OPT += -msse4.1
 FCOMMON_OPT += -msse4.1
 endif
 endif
-endif
 
diff --git a/Makefile.x86_64 b/Makefile.x86_64
index 43bfc9ecd..00967bcb6 100644
--- a/Makefile.x86_64
+++ b/Makefile.x86_64
@@ -20,18 +20,24 @@ ifdef HAVE_SSE4_1
 CCOMMON_OPT += -msse4.1
 FCOMMON_OPT += -msse4.1
 endif
+ifndef OLDGCC
 ifdef HAVE_AVX
 CCOMMON_OPT += -mavx
 FCOMMON_OPT += -mavx
 endif
+endif
+ifndef NO_AVX2
 ifdef HAVE_AVX2
 CCOMMON_OPT += -mavx2
 FCOMMON_OPT += -mavx2
 endif
+endif
+ifndef OLDGCC
 ifdef HAVE_FMA3
 CCOMMON_OPT += -mfma
 FCOMMON_OPT += -mfma
 endif
+endif
 
 ifeq ($(CORE), SKYLAKEX)
 ifndef DYNAMIC_ARCH
diff --git a/c_check b/c_check
index 405963ae6..a841df153 100644
--- a/c_check
+++ b/c_check
@@ -276,6 +276,15 @@ if ($data =~ /HAVE_C11/) {
     }
 }
 
+if ($compiler eq "GCC" &&( ($architecture eq "x86") || ($architecture eq "x86_64"))) {
+	$no_avx2 = 0;
+	$oldgcc = 0;
+	$data = `$compiler_name -dumpversion`;
+	if ($data <= 4.6) {
+		$no_avx2 = 1;
+		$oldgcc = 1;
+	}
+}
 
 $data = `$compiler_name $flags -S ctest1.c && grep globl ctest1.s | head -n 1 && rm -f ctest1.s`;
 
@@ -368,6 +377,8 @@ print MAKEFILE "CEXTRALIB=$linker_L $linker_l $linker_a\n";
 print MAKEFILE "HAVE_MSA=1\n" if $have_msa eq 1;
 print MAKEFILE "MSA_FLAGS=$msa_flags\n" if $have_msa eq 1;
 print MAKEFILE "NO_AVX512=1\n" if $no_avx512 eq 1;
+print MAKEFILE "NO_AVX2=1\n" if $no_avx2 eq 1;
+print MAKEFILE "OLDGCC=1\n" if $oldgcc eq 1;
 
 $os           =~ tr/[a-z]/[A-Z]/;
 $architecture =~ tr/[a-z]/[A-Z]/;
diff --git a/getarch.c b/getarch.c
index f107da3e9..9344defb5 100644
--- a/getarch.c
+++ b/getarch.c
@@ -326,6 +326,16 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define FORCE
 #define FORCE_INTEL
 #define ARCHITECTURE    "X86"
+#ifdef NO_AVX2
+#define SUBARCHITECTURE "SANDYBRIDGE"
+#define ARCHCONFIG   "-DSANDYBRIDGE " \
+		     "-DL1_DATA_SIZE=32768 -DL1_DATA_LINESIZE=64 " \
+		     "-DL2_SIZE=262144 -DL2_LINESIZE=64 " \
+		     "-DDTB_DEFAULT_ENTRIES=64 -DDTB_SIZE=4096 " \
+		     "-DHAVE_CMOV -DHAVE_MMX -DHAVE_SSE -DHAVE_SSE2 -DHAVE_SSE3 -DHAVE_SSSE3 -DHAVE_SSE4_1 -DHAVE_SSE4_2 -DHAVE_AVX"
+#define LIBNAME   "sandybridge"
+#define CORENAME  "SANDYBRIDGE"
+#else
 #define SUBARCHITECTURE "HASWELL"
 #define ARCHCONFIG   "-DHASWELL " \
 		     "-DL1_DATA_SIZE=32768 -DL1_DATA_LINESIZE=64 " \
@@ -336,6 +346,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define LIBNAME   "haswell"
 #define CORENAME  "HASWELL"
 #endif
+#endif
 
 #ifdef FORCE_SKYLAKEX
 #ifdef NO_AVX512
@@ -551,6 +562,16 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define FORCE
 #define FORCE_INTEL
 #define ARCHITECTURE    "X86"
+#ifdef NO_AVX2
+#define SUBARCHITECTURE "SANDYBRIDGE"
+#define ARCHCONFIG   "-DSANDYBRIDGE " \
+		     "-DL1_DATA_SIZE=32768 -DL1_DATA_LINESIZE=64 " \
+		     "-DL2_SIZE=262144 -DL2_LINESIZE=64 " \
+		     "-DDTB_DEFAULT_ENTRIES=64 -DDTB_SIZE=4096 " \
+		     "-DHAVE_CMOV -DHAVE_MMX -DHAVE_SSE -DHAVE_SSE2 -DHAVE_SSE3 -DHAVE_SSSE3 -DHAVE_SSE4_1 -DHAVE_SSE4_2 -DHAVE_AVX"
+#define LIBNAME   "sandybridge"
+#define CORENAME  "SANDYBRIDGE"
+#else
 #define SUBARCHITECTURE "ZEN"
 #define ARCHCONFIG   "-DZEN " \
 		     "-DL1_CODE_SIZE=32768 -DL1_CODE_LINESIZE=64 -DL1_CODE_ASSOCIATIVE=8 " \
@@ -565,6 +586,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define LIBNAME   "zen"
 #define CORENAME  "ZEN"
 #endif
+#endif
 
 
 #ifdef FORCE_SSE_GENERIC