[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH v5 1/2] configure: detect ifunc and avx2 attribute
From: |
Liang Li |
Subject: |
[Qemu-devel] [PATCH v5 1/2] configure: detect ifunc and avx2 attribute |
Date: |
Wed, 27 Jan 2016 15:33:53 +0800 |
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 <address@hidden>
Suggested-by: Peter Maydell <address@hidden>
Signed-off-by: Liang Li <address@hidden>
---
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