[Qemu-devel] [PATCH v5 1/2] configure: detect ifunc and avx2 attribute

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

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 <pbonzini@redhat.com>
Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Liang Li <liang.z.li@intel.com>
---
 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