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[Qemu-devel] [PATCH v4 1/2] configure: detect ifunc and avx2 attribute
From: |
Liang Li |
Subject: |
[Qemu-devel] [PATCH v4 1/2] configure: detect ifunc and avx2 attribute |
Date: |
Wed, 20 Jan 2016 17:05:41 +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.
Signed-off-by: Liang Li <address@hidden>
---
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