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.
Signed-off-by: Liang Li <liang.z...@intel.com> --- configure | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/configure b/configure index 44ac9ab..b7f4661 100755 --- a/configure +++ b/configure @@ -310,6 +310,7 @@ smartcard="" libusb="" usb_redir="" opengl="" +avx2_opt="" zlib="yes" lzo="" snappy="" @@ -1827,6 +1828,20 @@ EOF fi ########################################## +# avx2 optimization requirement check + +cat > $TMPC << EOF +static void bar(void) {} +static void foo(void) __attribute__((ifunc("bar"))); +int main(void) { foo(); return 0; } +EOF +if compile_prog "" "-mavx2" ; then + avx2_opt="yes" +else + avx2_opt="no" +fi + +######################################### # zlib check if test "$zlib" != "no" ; then @@ -4855,6 +4870,7 @@ 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" @@ -5236,6 +5252,10 @@ if test "$opengl" = "yes" ; then echo "OPENGL_LIBS=$opengl_libs" >> $config_host_mak fi +if test "$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 -- 1.9.1