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| author | Liang Li | 2016-03-08 06:53:16 +0100 |
|---|---|---|
| committer | Amit Shah | 2016-03-08 12:23:26 +0100 |
| commit | 99f2dbd34328771b12dee782ebccda1c25b4c23b (patch) | |
| tree | b1b7db8ef57f54b69e117907105f272bcb0b1325 | |
| parent | Postcopy: Fix sync count in info migrate (diff) | |
| download | qemu-99f2dbd34328771b12dee782ebccda1c25b4c23b.tar.gz qemu-99f2dbd34328771b12dee782ebccda1c25b4c23b.tar.xz qemu-99f2dbd34328771b12dee782ebccda1c25b4c23b.zip | |
configure: detect ifunc and avx2 attribute
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>
Message-Id: <1457416397-26671-2-git-send-email-liang.z.li@intel.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
| -rwxr-xr-x | configure | 21 |
1 files changed, 21 insertions, 0 deletions
@@ -280,6 +280,7 @@ libusb="" usb_redir="" opengl="" opengl_dmabuf="no" +avx2_opt="no" zlib="yes" lzo="" snappy="" @@ -1773,6 +1774,21 @@ 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 @@ -4790,6 +4806,7 @@ 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" @@ -5178,6 +5195,10 @@ if test "$opengl" = "yes" ; then fi fi +if test "$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 |