From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50836) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aOKgO-0003Oo-Kv for qemu-devel@nongnu.org; Wed, 27 Jan 2016 02:38:29 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aOKgL-0004HT-EA for qemu-devel@nongnu.org; Wed, 27 Jan 2016 02:38:28 -0500 Received: from mga02.intel.com ([134.134.136.20]:3346) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aOKgL-0004HF-8K for qemu-devel@nongnu.org; Wed, 27 Jan 2016 02:38:25 -0500 From: Liang Li Date: Wed, 27 Jan 2016 15:33:53 +0800 Message-Id: <1453880034-25076-2-git-send-email-liang.z.li@intel.com> In-Reply-To: <1453880034-25076-1-git-send-email-liang.z.li@intel.com> References: <1453880034-25076-1-git-send-email-liang.z.li@intel.com> Subject: [Qemu-devel] [PATCH v5 1/2] configure: detect ifunc and avx2 attribute List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: peter.maydell@linaro.org, quintela@redhat.com, Liang Li , dgilbert@redhat.com, stefanha@redhat.com, amit.shah@redhat.com, pbonzini@redhat.com, rth@twiddle.net 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: Paolo Bonzini Suggested-by: Peter Maydell Signed-off-by: Liang Li --- configure | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/configure b/configure index 3506e44..a50dcf5 100755 --- a/configure +++ b/configure @@ -311,6 +311,7 @@ smartcard="" libusb="" usb_redir="" opengl="" +avx2_opt="no" zlib="yes" lzo="" snappy="" @@ -1832,6 +1833,21 @@ 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 @@ -4922,6 +4938,7 @@ 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" @@ -5306,6 +5323,10 @@ 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