[PATCH 1/2] configure: add configure option avx512f_opt

[Robert Hoo]

Like previous avx2_opt option, config-host.mak will have CONFIG_AVX512F_OPT
defined if compiling host has the ability.

AVX512F instruction set is available since Intel Skylake.
More info:
https://software.intel.com/sites/default/files/managed/c5/15/architecture-instruction-set-extensions-programming-reference.pdf

Signed-off-by: Robert Hoo <address@hidden>
---
 configure | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/configure b/configure
index 115dc38..9bf8de0 100755
--- a/configure
+++ b/configure
@@ -1382,6 +1382,11 @@ for opt do
   ;;
   --enable-avx2) avx2_opt="yes"
   ;;
+  --disable-avx512f) avx512f_opt="no"
+  ;;
+  --enable-avx512f) avx512f_opt="yes"
+  ;;
+
   --enable-glusterfs) glusterfs="yes"
   ;;
   --disable-virtio-blk-data-plane|--enable-virtio-blk-data-plane)
@@ -1811,6 +1816,7 @@ disabled with --disable-FEATURE, default is enabled if 
available:
   tcmalloc        tcmalloc support
   jemalloc        jemalloc support
   avx2            AVX2 optimization support
+  avx512f         AVX512F optimization support
   replication     replication support
   opengl          opengl support
   virglrenderer   virgl rendering support
@@ -5481,6 +5487,34 @@ EOF
   fi
 fi
 
+##########################################
+# avx512f optimization requirement check
+#
+# There is no point enabling this if cpuid.h is not usable,
+# since we won't be able to select the new routines.
+
+if test "$cpuid_h" = "yes" && test "$avx512f_opt" != "no"; then
+  cat > $TMPC << EOF
+#pragma GCC push_options
+#pragma GCC target("avx512f")
+#include <cpuid.h>
+#include <immintrin.h>
+static int bar(void *a) {
+    __m512i x = *(__m512i *)a;
+    return _mm512_test_epi64_mask(x, x);
+}
+int main(int argc, char *argv[])
+{
+       return bar(argv[0]);
+}
+EOF
+  if compile_object "" ; then
+    avx512f_opt="yes"
+  else
+    avx512f_opt="no"
+  fi
+fi
+
 ########################################
 # check if __[u]int128_t is usable.
 
@@ -6605,6 +6639,7 @@ echo "libxml2           $libxml2"
 echo "tcmalloc support  $tcmalloc"
 echo "jemalloc support  $jemalloc"
 echo "avx2 optimization $avx2_opt"
+echo "avx512f optimization $avx512f_opt"
 echo "replication support $replication"
 echo "VxHS block device $vxhs"
 echo "bochs support     $bochs"
@@ -7152,6 +7187,10 @@ if test "$avx2_opt" = "yes" ; then
   echo "CONFIG_AVX2_OPT=y" >> $config_host_mak
 fi
 
+if test "$avx512f_opt" = "yes" ; then
+  echo "CONFIG_AVX512F_OPT=y" >> $config_host_mak
+fi
+
 if test "$lzo" = "yes" ; then
   echo "CONFIG_LZO=y" >> $config_host_mak
 fi
-- 
1.8.3.1