| Message ID | 1453280742-20718-2-git-send-email-liang.z.li@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 20/01/2016 10:05, Liang Li wrote: > 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.li@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 > $TMPC << EOF > +static void bar(void) {} Might be nicer to use "void *" and return an actual function name: static void bar(void) {} static void *bar_ifunc(void) { return (void *)bar; } void foo(void) __attribute__((ifunc("bar_ifunc"))); And also you probably should use "readelf --syms ... | grep IFUNC.*foo" to check that the attribute was not ignored. Paolo > +static void foo(void) __attribute__((ifunc("bar"))); > +int main(void) { foo(); return 0; } > +EOF > +if compile_prog "" "-mavx2" ; then > + avx2_opt="yes" > +else > + avx2_opt="no" > +fi > + > +######################################### > # zlib check > > if test "$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 >
> On 20/01/2016 10:05, Liang Li wrote: > > 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.li@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) {} > > Might be nicer to use "void *" and return an actual function name: > > static void bar(void) {} > static void *bar_ifunc(void) { return (void *)bar; } void foo(void) > __attribute__((ifunc("bar_ifunc"))); > > And also you probably should use "readelf --syms ... | grep IFUNC.*foo" > to check that the attribute was not ignored. > > Paolo > Got it, will change in the next version. Liang
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
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.li@intel.com> --- configure | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)