[Qemu-devel] [PATCH 2/2] configure: add --enable-avx2 option

[Liang Li <liang.z.li@intel.com>]

Add the --enable-avx2 option so as to enable the AVX2
instruction optimization for buffer_find_nonzero_offset().

Signed-off-by: Liang Li <liang.z.li@intel.com>
---
 configure | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/configure b/configure
index 9d24d59..ee84172 100755
--- a/configure
+++ b/configure
@@ -307,6 +307,7 @@ smartcard_nss=""
 libusb=""
 usb_redir=""
 opengl=""
+avx2="no"
 zlib="yes"
 lzo=""
 snappy=""
@@ -1052,6 +1053,8 @@ for opt do
   ;;
   --enable-usb-redir) usb_redir="yes"
   ;;
+  --enable-avx2) avx2="yes"
+  ;;
   --disable-zlib-test) zlib="no"
   ;;
   --disable-lzo) lzo="no"
@@ -1354,6 +1357,7 @@ disabled with --disable-FEATURE, default is enabled if available:
   smartcard-nss   smartcard nss support
   libusb          libusb (for usb passthrough)
   usb-redir       usb network redirection support
+  avx2            support of avx2 instruction
   lzo             support of lzo compression library
   snappy          support of snappy compression library
   bzip2           support of bzip2 compression library
@@ -1758,6 +1762,13 @@ EOF
   fi
 fi
 
+########################################
+# avx2 check
+
+if test "$avx2" = "yes" ; then
+        CFLAGS="$CFLAGS -mavx2"
+fi
+
 ##########################################
 # zlib check
 
@@ -4589,6 +4600,7 @@ echo "libssh2 support   $libssh2"
 echo "TPM passthrough   $tpm_passthrough"
 echo "QOM debugging     $qom_cast_debug"
 echo "vhdx              $vhdx"
+echo "avx2 support      $avx2"
 echo "lzo support       $lzo"
 echo "snappy support    $snappy"
 echo "bzip2 support     $bzip2"
@@ -4962,6 +4974,10 @@ if test "$opengl" = "yes" ; then
   echo "OPENGL_LIBS=$opengl_libs" >> $config_host_mak
 fi
 
+if test "$avx2" = "yes" ; then
+  echo "CONFIG_AVX2=y" >> $config_host_mak
+fi
+
 if test "$lzo" = "yes" ; then
   echo "CONFIG_LZO=y" >> $config_host_mak
 fi
-- 
1.9.1