Commit 99f2dbd3 authored by Liang Li's avatar Liang Li Committed by Amit Shah
Browse files

configure: detect ifunc and avx2 attribute 



Detect if the compiler can support the ifun and avx2, if so, set
CONFIG_AVX2_OPT which will be used to turn on the avx2 instruction
optimization.

Suggested-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Suggested-by: default avatarPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: default avatarLiang Li <liang.z.li@intel.com>
Message-Id: <1457416397-26671-2-git-send-email-liang.z.li@intel.com>
Signed-off-by: default avatarAmit Shah <amit.shah@redhat.com>
parent 614e8018

configure

+21 −0
Original line number Diff line number Diff line
@@ -280,6 +280,7 @@ libusb="" 
usb_redir=""

opengl=""

opengl_dmabuf="no"

avx2_opt="no"

zlib="yes"

lzo=""

snappy=""
@@ -1773,6 +1774,21 @@ EOF 
fi



##########################################

# avx2 optimization requirement check



cat > $TMPC << EOF

static void bar(void) {}

static void *bar_ifunc(void) {return (void*) bar;}

static void foo(void) __attribute__((ifunc("bar_ifunc")));

int main(void) { foo(); return 0; }

EOF

if compile_prog "-mavx2" "" ; then

    if readelf --syms $TMPE |grep "IFUNC.*foo" >/dev/null 2>&1; then

        avx2_opt="yes"

    fi

fi



#########################################

# zlib check



if test "$zlib" != "no" ; then
@@ -4790,6 +4806,7 @@ echo "bzip2 support $bzip2" 
echo "NUMA host support $numa"

echo "tcmalloc support  $tcmalloc"

echo "jemalloc support  $jemalloc"

echo "avx2 optimization $avx2_opt"



if test "$sdl_too_old" = "yes"; then

echo "-> Your SDL version is too old - please upgrade to have SDL support"
@@ -5178,6 +5195,10 @@ if test "$opengl" = "yes" ; then 
  fi

fi



if test "$avx2_opt" = "yes" ; then

  echo "CONFIG_AVX2_OPT=y" >> $config_host_mak

fi



if test "$lzo" = "yes" ; then

  echo "CONFIG_LZO=y" >> $config_host_mak

fi