diff --git a/m4/ax_append_flag.m4 b/m4/ax_append_flag.m4
index 1d38b76..e8c5312 100644
--- a/m4/ax_append_flag.m4
+++ b/m4/ax_append_flag.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#      http://www.gnu.org/software/autoconf-archive/ax_append_flag.html
+#      https://www.gnu.org/software/autoconf-archive/ax_append_flag.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -34,7 +34,7 @@
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
@@ -49,21 +49,23 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 2
+#serial 7
 
 AC_DEFUN([AX_APPEND_FLAG],
-[AC_PREREQ(2.59)dnl for _AC_LANG_PREFIX
-AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])])dnl
-AS_VAR_SET_IF(FLAGS,
-  [case " AS_VAR_GET(FLAGS) " in
-    *" $1 "*)
-      AC_RUN_LOG([: FLAGS already contains $1])
-      ;;
-    *)
-      AC_RUN_LOG([: FLAGS="$FLAGS $1"])
-      AS_VAR_SET(FLAGS, ["AS_VAR_GET(FLAGS) $1"])
-      ;;
-   esac],
-  [AS_VAR_SET(FLAGS,["$1"])])
+[dnl
+AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_SET_IF
+AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])])
+AS_VAR_SET_IF(FLAGS,[
+  AS_CASE([" AS_VAR_GET(FLAGS) "],
+    [*" $1 "*], [AC_RUN_LOG([: FLAGS already contains $1])],
+    [
+     AS_VAR_APPEND(FLAGS,[" $1"])
+     AC_RUN_LOG([: FLAGS="$FLAGS"])
+    ])
+  ],
+  [
+  AS_VAR_SET(FLAGS,[$1])
+  AC_RUN_LOG([: FLAGS="$FLAGS"])
+  ])
 AS_VAR_POPDEF([FLAGS])dnl
 ])dnl AX_APPEND_FLAG
diff --git a/m4/ax_cc_maxopt.m4 b/m4/ax_cc_maxopt.m4
index 62e3b53..59d03da 100644
--- a/m4/ax_cc_maxopt.m4
+++ b/m4/ax_cc_maxopt.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#       http://www.gnu.org/software/autoconf-archive/ax_cc_maxopt.html
+#       https://www.gnu.org/software/autoconf-archive/ax_cc_maxopt.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -40,7 +40,7 @@
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
@@ -55,7 +55,7 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 13
+#serial 17
 
 AC_DEFUN([AX_CC_MAXOPT],
 [
@@ -115,11 +115,19 @@
 	      AX_GCC_X86_CPUID(0)
               AX_GCC_X86_CPUID(1)
 	      case $ax_cv_gcc_x86_cpuid_0 in # see AX_GCC_ARCHFLAG
-                *:756e6547:*:*) # Intel
+                *:756e6547:6c65746e:49656e69) # Intel
                   case $ax_cv_gcc_x86_cpuid_1 in
-                    *6a?:*[[234]]:*:*|*6[[789b]]?:*:*:*) icc_flags="-xK";;
-                    *f3[[347]]:*:*:*|*f4[1347]:*:*:*) icc_flags="-xP -xN -xW -xK";;
-                    *f??:*:*:*) icc_flags="-xN -xW -xK";;
+		    *0?6[[78ab]]?:*:*:*|?6[[78ab]]?:*:*:*|6[[78ab]]?:*:*:*) icc_flags="-xK" ;;
+		    *0?6[[9d]]?:*:*:*|?6[[9d]]?:*:*:*|6[[9d]]?:*:*:*|*1?65?:*:*:*) icc_flags="-xSSE2 -xB -xK" ;;
+		    *0?6e?:*:*:*|?6e?:*:*:*|6e?:*:*:*) icc_flags="-xSSE3 -xP -xO -xB -xK" ;;
+		    *0?6f?:*:*:*|?6f?:*:*:*|6f?:*:*:*|*1?66?:*:*:*) icc_flags="-xSSSE3 -xT -xB -xK" ;;
+		    *1?6[[7d]]?:*:*:*) icc_flags="-xSSE4.1 -xS -xT -xB -xK" ;;
+		    *1?6[[aef]]?:*:*:*|*2?6[[5cef]]?:*:*:*) icc_flags="-xSSE4.2 -xS -xT -xB -xK" ;;
+		    *2?6[[ad]]?:*:*:*) icc_flags="-xAVX -SSE4.2 -xS -xT -xB -xK" ;;
+		    *3?6[[ae]]?:*:*:*) icc_flags="-xCORE-AVX-I -xAVX -SSE4.2 -xS -xT -xB -xK" ;;
+		    *3?6[[cf]]?:*:*:*|*4?6[[56]]?:*:*:*) icc_flags="-xCORE-AVX2 -xCORE-AVX-I -xAVX -SSE4.2 -xS -xT -xB -xK" ;;
+		    *000?f[[346]]?:*:*:*|?f[[346]]?:*:*:*|f[[346]]?:*:*:*) icc_flags="-xSSE3 -xP -xO -xN -xW -xK" ;;
+		    *00??f??:*:*:*|??f??:*:*:*|?f??:*:*:*|f??:*:*:*) icc_flags="-xSSE2 -xN -xW -xK" ;;
                   esac ;;
               esac ;;
           esac
@@ -141,8 +149,7 @@
      CFLAGS="-O3 -fomit-frame-pointer"
 
      # -malign-double for x86 systems
-     # LIBFFI -- DON'T DO THIS - CHANGES ABI
-     # AX_CHECK_COMPILE_FLAG(-malign-double, CFLAGS="$CFLAGS -malign-double")
+     AX_CHECK_COMPILE_FLAG(-malign-double, CFLAGS="$CFLAGS -malign-double")
 
      #  -fstrict-aliasing for gcc-2.95+
      AX_CHECK_COMPILE_FLAG(-fstrict-aliasing,
@@ -153,6 +160,11 @@
 
      AX_GCC_ARCHFLAG($acx_maxopt_portable)
      ;;
+
+    microsoft)
+     # default optimization flags for MSVC opt builds
+     CFLAGS="-O2"
+     ;;
   esac
 
   if test -z "$CFLAGS"; then
diff --git a/m4/ax_cflags_warn_all.m4 b/m4/ax_cflags_warn_all.m4
index 0fa3e18..094577e 100644
--- a/m4/ax_cflags_warn_all.m4
+++ b/m4/ax_cflags_warn_all.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#    http://www.gnu.org/software/autoconf-archive/ax_cflags_warn_all.html
+#    https://www.gnu.org/software/autoconf-archive/ax_cflags_warn_all.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -43,7 +43,7 @@
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
@@ -58,7 +58,7 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 14
+#serial 16
 
 AC_DEFUN([AX_FLAGS_WARN_ALL],[dnl
 AS_VAR_PUSHDEF([FLAGS],[_AC_LANG_PREFIX[]FLAGS])dnl
@@ -84,7 +84,7 @@
 FLAGS="$ac_save_[]FLAGS"
 ])
 AS_VAR_POPDEF([FLAGS])dnl
-AC_REQUIRE([AX_APPEND_FLAG])
+AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
 case ".$VAR" in
      .ok|.ok,*) m4_ifvaln($3,$3) ;;
    .|.no|.no,*) m4_default($4,[m4_ifval($2,[AX_APPEND_FLAG([$2], [$1])])]) ;;
diff --git a/m4/ax_check_compile_flag.m4 b/m4/ax_check_compile_flag.m4
index c3a8d69..dcabb92 100644
--- a/m4/ax_check_compile_flag.m4
+++ b/m4/ax_check_compile_flag.m4
@@ -1,10 +1,10 @@
 # ===========================================================================
-#   http://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
+#  https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
-#   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS])
+#   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
 #
 # DESCRIPTION
 #
@@ -19,6 +19,8 @@
 #   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
 #   force the compiler to issue an error when a bad flag is given.
 #
+#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
+#
 #   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
 #   macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
 #
@@ -38,7 +40,7 @@
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
@@ -53,19 +55,19 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 2
+#serial 5
 
 AC_DEFUN([AX_CHECK_COMPILE_FLAG],
-[AC_PREREQ(2.59)dnl for _AC_LANG_PREFIX
+[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
 AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
 AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
   ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
   _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
-  AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
+  AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
     [AS_VAR_SET(CACHEVAR,[yes])],
     [AS_VAR_SET(CACHEVAR,[no])])
   _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
-AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes],
+AS_VAR_IF(CACHEVAR,yes,
   [m4_default([$2], :)],
   [m4_default([$3], :)])
 AS_VAR_POPDEF([CACHEVAR])dnl
diff --git a/m4/ax_compiler_vendor.m4 b/m4/ax_compiler_vendor.m4
index 73e32ea..4ca8089 100644
--- a/m4/ax_compiler_vendor.m4
+++ b/m4/ax_compiler_vendor.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#    http://www.gnu.org/software/autoconf-archive/ax_compiler_vendor.html
+#    https://www.gnu.org/software/autoconf-archive/ax_compiler_vendor.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -29,7 +29,7 @@
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
@@ -44,22 +44,24 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 11
+#serial 16
 
 AC_DEFUN([AX_COMPILER_VENDOR],
 [AC_CACHE_CHECK([for _AC_LANG compiler vendor], ax_cv_[]_AC_LANG_ABBREV[]_compiler_vendor,
+  dnl Please add if possible support to ax_compiler_version.m4
   [# note: don't check for gcc first since some other compilers define __GNUC__
   vendors="intel:     __ICC,__ECC,__INTEL_COMPILER
            ibm:       __xlc__,__xlC__,__IBMC__,__IBMCPP__
            pathscale: __PATHCC__,__PATHSCALE__
            clang:     __clang__
+           cray:      _CRAYC
+           fujitsu:   __FUJITSU
            gnu:       __GNUC__
            sun:       __SUNPRO_C,__SUNPRO_CC
            hp:        __HP_cc,__HP_aCC
            dec:       __DECC,__DECCXX,__DECC_VER,__DECCXX_VER
-           borland:   __BORLANDC__,__TURBOC__
+           borland:   __BORLANDC__,__CODEGEARC__,__TURBOC__
            comeau:    __COMO__
-           cray:      _CRAYC
            kai:       __KCC
            lcc:       __LCC__
            sgi:       __sgi,sgi
@@ -67,6 +69,7 @@
            metrowerks: __MWERKS__
            watcom:    __WATCOMC__
            portland:  __PGI
+	   tcc:       __TINYC__
            unknown:   UNKNOWN"
   for ventest in $vendors; do
     case $ventest in
diff --git a/m4/ax_configure_args.m4 b/m4/ax_configure_args.m4
index 0726b1b..95f9f64 100644
--- a/m4/ax_configure_args.m4
+++ b/m4/ax_configure_args.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#     http://www.gnu.org/software/autoconf-archive/ax_configure_args.html
+#    https://www.gnu.org/software/autoconf-archive/ax_configure_args.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -15,7 +15,7 @@
 #   to rely on eval'ing $ac_configure_args however some old autoconf
 #   versions do not provide that. To ensure maximum portability of autoconf
 #   extension macros this helper can be AC_REQUIRE'd so that
-#   $ac_configure_args will alsways be present.
+#   $ac_configure_args will always be present.
 #
 #   Sadly, the traditional "exec $SHELL" of the enable_builddir macros is
 #   spoiled now and must be replaced by "eval + exit $?".
@@ -42,7 +42,7 @@
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
@@ -57,10 +57,10 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 9
+#serial 13
 
 AC_DEFUN([AX_CONFIGURE_ARGS],[
-   # [$]@ is unsable in 2.60+ but earlier autoconf had no ac_configure_args
+   # [$]@ is unusable in 2.60+ but earlier autoconf had no ac_configure_args
    if test "${ac_configure_args+set}" != "set" ; then
       ac_configure_args=
       for ac_arg in ${1+"[$]@"}; do
diff --git a/m4/ax_enable_builddir.m4 b/m4/ax_enable_builddir.m4
index 3cb2093..710384d 100644
--- a/m4/ax_enable_builddir.m4
+++ b/m4/ax_enable_builddir.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#    http://www.gnu.org/software/autoconf-archive/ax_enable_builddir.html
+#    https://www.gnu.org/software/autoconf-archive/ax_enable_builddir.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -24,7 +24,7 @@
 #   toplevel builddir Makefile. It just copies the variables and
 #   rule-targets, each extended with a default rule-execution that recurses
 #   into the build directory of the current "HOST". You can override the
-#   auto-dection through `config.guess` and build-time of course, as in
+#   auto-detection through `config.guess` and build-time of course, as in
 #
 #     make HOST=i386-mingw-cross
 #
@@ -42,7 +42,7 @@
 #   into. Usually, the last one is the only one used. However, almost all
 #   targets have an additional "*-all" rule which makes the script to
 #   recurse into _all_ variants of the current HOST (!!) setting. The "-all"
-#   suffix can be overriden for the macro as well.
+#   suffix can be overridden for the macro as well.
 #
 #   a special rule is only given for things like "dist" that will copy the
 #   tarball from the builddir to the sourcedir (or $(PUB)) for reason of
@@ -64,7 +64,7 @@
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
@@ -79,10 +79,11 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 23
+#serial 30
 
 AC_DEFUN([AX_ENABLE_BUILDDIR],[
 AC_REQUIRE([AC_CANONICAL_HOST])[]dnl
+AC_REQUIRE([AC_CANONICAL_TARGET])[]dnl
 AC_REQUIRE([AX_CONFIGURE_ARGS])[]dnl
 AC_REQUIRE([AM_AUX_DIR_EXPAND])[]dnl
 AC_BEFORE([$0],[AM_INIT_AUTOMAKE])dnl
@@ -121,7 +122,7 @@
       test -f $srcdir/$cache_file  && mv $srcdir/$cache_file  .
       AC_MSG_RESULT(....exec $SHELL $srcdir/[$]0 "--srcdir=$srcdir" "--enable-builddir=$SUB" ${1+"[$]@"})
       case "[$]0" in # restart
-       [[\\/]]* | ?:[[\\/]]*) # Asbolute name
+       [[\\/]]* | ?:[[\\/]]*) # Absolute name
          eval $SHELL "'[$]0'" "'--srcdir=$srcdir'" "'--enable-builddir=$SUB'" $ac_configure_args ;;
        *) eval $SHELL "'$srcdir/[$]0'" "'--srcdir=$srcdir'" "'--enable-builddir=$SUB'" $ac_configure_args ;;
       esac ; exit $?
diff --git a/m4/ax_gcc_archflag.m4 b/m4/ax_gcc_archflag.m4
index aab2661..d4a37f8 100644
--- a/m4/ax_gcc_archflag.m4
+++ b/m4/ax_gcc_archflag.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#      http://www.gnu.org/software/autoconf-archive/ax_gcc_archflag.html
+#     https://www.gnu.org/software/autoconf-archive/ax_gcc_archflag.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -36,7 +36,8 @@
 #
 #   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
 #   Copyright (c) 2008 Matteo Frigo
-#   Copyright (c) 2012 Tsukasa Oi
+#   Copyright (c) 2014 Tsukasa Oi
+#   Copyright (c) 2017 Alexey Kopytov
 #
 #   This program is free software: you can redistribute it and/or modify it
 #   under the terms of the GNU General Public License as published by the
@@ -49,7 +50,7 @@
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
@@ -64,11 +65,13 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 11
+#serial 20
 
 AC_DEFUN([AX_GCC_ARCHFLAG],
 [AC_REQUIRE([AC_PROG_CC])
 AC_REQUIRE([AC_CANONICAL_HOST])
+AC_REQUIRE([AC_PROG_SED])
+AC_REQUIRE([AX_COMPILER_VENDOR])
 
 AC_ARG_WITH(gcc-arch, [AS_HELP_STRING([--with-gcc-arch=<arch>], [use architecture <arch> for gcc -march/-mtune, instead of guessing])],
 	ax_gcc_arch=$withval, ax_gcc_arch=yes)
@@ -85,63 +88,70 @@
 ax_gcc_arch=""
 if test "$cross_compiling" = no; then
 case $host_cpu in
-  i[[3456]]86*|x86_64*) # use cpuid codes
+  i[[3456]]86*|x86_64*|amd64*) # use cpuid codes
      AX_GCC_X86_CPUID(0)
      AX_GCC_X86_CPUID(1)
      case $ax_cv_gcc_x86_cpuid_0 in
-       *:756e6547:*:*) # Intel
+       *:756e6547:6c65746e:49656e69) # Intel
           case $ax_cv_gcc_x86_cpuid_1 in
-	    *5[[48]]?:*:*:*) ax_gcc_arch="pentium-mmx pentium" ;;
-	    *5??:*:*:*) ax_gcc_arch=pentium ;;
-	    *0?6[[3456]]?:*:*:*) ax_gcc_arch="pentium2 pentiumpro" ;;
-	    *0?6a?:*[[01]]:*:*) ax_gcc_arch="pentium2 pentiumpro" ;;
-	    *0?6a?:*[[234]]:*:*) ax_gcc_arch="pentium3 pentiumpro" ;;
-	    *0?6[[9de]]?:*:*:*) ax_gcc_arch="pentium-m pentium3 pentiumpro" ;;
-	    *0?6[[78b]]?:*:*:*) ax_gcc_arch="pentium3 pentiumpro" ;;
-	    *0?6f?:*:*:*|*1?66?:*:*:*) ax_gcc_arch="core2 pentium-m pentium3 pentiumpro" ;;
+	    *5[[4578]]?:*:*:*) ax_gcc_arch="pentium-mmx pentium" ;;
+	    *5[[123]]?:*:*:*) ax_gcc_arch=pentium ;;
+	    *0?61?:*:*:*|?61?:*:*:*|61?:*:*:*) ax_gcc_arch=pentiumpro ;;
+	    *0?6[[356]]?:*:*:*|?6[[356]]?:*:*:*|6[[356]]?:*:*:*) ax_gcc_arch="pentium2 pentiumpro" ;;
+	    *0?6[[78ab]]?:*:*:*|?6[[78ab]]?:*:*:*|6[[78ab]]?:*:*:*) ax_gcc_arch="pentium3 pentiumpro" ;;
+	    *0?6[[9d]]?:*:*:*|?6[[9d]]?:*:*:*|6[[9d]]?:*:*:*|*1?65?:*:*:*) ax_gcc_arch="pentium-m pentium3 pentiumpro" ;;
+	    *0?6e?:*:*:*|?6e?:*:*:*|6e?:*:*:*) ax_gcc_arch="yonah pentium-m pentium3 pentiumpro" ;;
+	    *0?6f?:*:*:*|?6f?:*:*:*|6f?:*:*:*|*1?66?:*:*:*) ax_gcc_arch="core2 pentium-m pentium3 pentiumpro" ;;
 	    *1?6[[7d]]?:*:*:*) ax_gcc_arch="penryn core2 pentium-m pentium3 pentiumpro" ;;
-	    *1?6[[aef]]?:*:*:*|*2?6[[5cef]]?:*:*:*) ax_gcc_arch="corei7 core2 pentium-m pentium3 pentiumpro" ;;
-	    *1?6c?:*:*:*|*[[23]]?66?:*:*:*) ax_gcc_arch="atom core2 pentium-m pentium3 pentiumpro" ;;
-	    *2?6[[ad]]?:*:*:*) ax_gcc_arch="corei7-avx corei7 core2 pentium-m pentium3 pentiumpro" ;;
-	    *0?6??:*:*:*) ax_gcc_arch=pentiumpro ;;
-	    *6??:*:*:*) ax_gcc_arch="core2 pentiumpro" ;;
-	    ?000?f3[[347]]:*:*:*|?000?f4[1347]:*:*:*|?000?f6?:*:*:*)
-		case $host_cpu in
-	          x86_64*) ax_gcc_arch="nocona pentium4 pentiumpro" ;;
-	          *) ax_gcc_arch="prescott pentium4 pentiumpro" ;;
-	        esac ;;
-	    ?000?f??:*:*:*) ax_gcc_arch="pentium4 pentiumpro";;
+	    *1?6[[aef]]?:*:*:*|*2?6e?:*:*:*) ax_gcc_arch="nehalem corei7 core2 pentium-m pentium3 pentiumpro" ;;
+	    *2?6[[5cf]]?:*:*:*) ax_gcc_arch="westmere corei7 core2 pentium-m pentium3 pentiumpro" ;;
+	    *2?6[[ad]]?:*:*:*) ax_gcc_arch="sandybridge corei7-avx corei7 core2 pentium-m pentium3 pentiumpro" ;;
+	    *3?6[[ae]]?:*:*:*) ax_gcc_arch="ivybridge core-avx-i corei7-avx corei7 core2 pentium-m pentium3 pentiumpro" ;;
+	    *3?6[[cf]]?:*:*:*|*4?6[[56]]?:*:*:*) ax_gcc_arch="haswell core-avx2 core-avx-i corei7-avx corei7 core2 pentium-m pentium3 pentiumpro" ;;
+	    *3?6d?:*:*:*) ax_gcc_arch="broadwell core-avx2 core-avx-i corei7-avx corei7 core2 pentium-m pentium3 pentiumpro" ;;
+	    *1?6c?:*:*:*|*2?6[[67]]?:*:*:*|*3?6[[56]]?:*:*:*) ax_gcc_arch="bonnell atom core2 pentium-m pentium3 pentiumpro" ;;
+	    *3?67?:*:*:*|*[[45]]?6[[ad]]?:*:*:*) ax_gcc_arch="silvermont atom core2 pentium-m pentium3 pentiumpro" ;;
+	    *000?f[[012]]?:*:*:*|?f[[012]]?:*:*:*|f[[012]]?:*:*:*) ax_gcc_arch="pentium4 pentiumpro" ;;
+	    *000?f[[346]]?:*:*:*|?f[[346]]?:*:*:*|f[[346]]?:*:*:*) ax_gcc_arch="nocona prescott pentium4 pentiumpro" ;;
+	    # fallback
+	    *5??:*:*:*) ax_gcc_arch=pentium ;;
+	    *??6??:*:*:*) ax_gcc_arch="core2 pentiumpro" ;;
+	    *6??:*:*:*) ax_gcc_arch=pentiumpro ;;
+	    *00??f??:*:*:*|??f??:*:*:*|?f??:*:*:*|f??:*:*:*) ax_gcc_arch="pentium4 pentiumpro" ;;
           esac ;;
-       *:68747541:*:*) # AMD
+       *:68747541:444d4163:69746e65) # AMD
           case $ax_cv_gcc_x86_cpuid_1 in
 	    *5[[67]]?:*:*:*) ax_gcc_arch=k6 ;;
-	    *5[[8d]]?:*:*:*) ax_gcc_arch="k6-2 k6" ;;
-	    *5[[9]]?:*:*:*) ax_gcc_arch="k6-3 k6" ;;
-	    *60?:*:*:*) ax_gcc_arch=k7 ;;
+	    *5[[8]]?:*:*:*) ax_gcc_arch="k6-2 k6" ;;
+	    *5[[9d]]?:*:*:*) ax_gcc_arch="k6-3 k6" ;;
 	    *6[[12]]?:*:*:*) ax_gcc_arch="athlon k7" ;;
 	    *6[[34]]?:*:*:*) ax_gcc_arch="athlon-tbird k7" ;;
-	    *67?:*:*:*) ax_gcc_arch="athlon-4 athlon k7" ;;
-	    *6[[68a]]?:*:*:*)
-	       AX_GCC_X86_CPUID(0x80000006) # L2 cache size
-	       case $ax_cv_gcc_x86_cpuid_0x80000006 in
-                 *:*:*[[1-9a-f]]??????:*) # (L2 = ecx >> 16) >= 256
-			ax_gcc_arch="athlon-xp athlon-4 athlon k7" ;;
-                 *) ax_gcc_arch="athlon-4 athlon k7" ;;
-	       esac ;;
-	    ?00??f[[4cef8b]]?:*:*:*) ax_gcc_arch="athlon64 k8" ;;
-	    ?00??f5?:*:*:*) ax_gcc_arch="opteron k8" ;;
-	    ?00??f7?:*:*:*) ax_gcc_arch="athlon-fx opteron k8" ;;
-	    ?00??f??:*:*:*) ax_gcc_arch="k8" ;;
-	    ?05??f??:*:*:*) ax_gcc_arch="btver1 amdfam10 k8" ;;
-	    ?06??f??:*:*:*) ax_gcc_arch="bdver1 amdfam10 k8" ;;
-	    *f??:*:*:*) ax_gcc_arch="amdfam10 k8" ;;
+	    *6[[678a]]?:*:*:*) ax_gcc_arch="athlon-xp athlon-4 athlon k7" ;;
+	    *000?f[[4578bcef]]?:*:*:*|?f[[4578bcef]]?:*:*:*|f[[4578bcef]]?:*:*:*|*001?f[[4578bcf]]?:*:*:*|1?f[[4578bcf]]?:*:*:*) ax_gcc_arch="athlon64 k8" ;;
+	    *002?f[[13457bcf]]?:*:*:*|2?f[[13457bcf]]?:*:*:*|*004?f[[138bcf]]?:*:*:*|4?f[[138bcf]]?:*:*:*|*005?f[[df]]?:*:*:*|5?f[[df]]?:*:*:*|*006?f[[8bcf]]?:*:*:*|6?f[[8bcf]]?:*:*:*|*007?f[[cf]]?:*:*:*|7?f[[cf]]?:*:*:*|*00c?f1?:*:*:*|c?f1?:*:*:*|*020?f3?:*:*:*|20?f3?:*:*:*) ax_gcc_arch="athlon64-sse3 k8-sse3 athlon64 k8" ;;
+	    *010?f[[245689a]]?:*:*:*|10?f[[245689a]]?:*:*:*|*030?f1?:*:*:*|30?f1?:*:*:*) ax_gcc_arch="barcelona amdfam10 k8" ;;
+	    *050?f[[12]]?:*:*:*|50?f[[12]]?:*:*:*) ax_gcc_arch="btver1 amdfam10 k8" ;;
+	    *060?f1?:*:*:*|60?f1?:*:*:*) ax_gcc_arch="bdver1 amdfam10 k8" ;;
+	    *060?f2?:*:*:*|60?f2?:*:*:*|*061?f[[03]]?:*:*:*|61?f[[03]]?:*:*:*) ax_gcc_arch="bdver2 bdver1 amdfam10 k8" ;;
+	    *063?f0?:*:*:*|63?f0?:*:*:*) ax_gcc_arch="bdver3 bdver2 bdver1 amdfam10 k8" ;;
+	    *07[[03]]?f0?:*:*:*|7[[03]]?f0?:*:*:*) ax_gcc_arch="btver2 btver1 amdfam10 k8" ;;
+	    # fallback
+	    *0[[13]]??f??:*:*:*|[[13]]??f??:*:*:*) ax_gcc_arch="barcelona amdfam10 k8" ;;
+	    *020?f??:*:*:*|20?f??:*:*:*) ax_gcc_arch="athlon64-sse3 k8-sse3 athlon64 k8" ;;
+	    *05??f??:*:*:*|5??f??:*:*:*) ax_gcc_arch="btver1 amdfam10 k8" ;;
+	    *060?f??:*:*:*|60?f??:*:*:*) ax_gcc_arch="bdver1 amdfam10 k8" ;;
+	    *061?f??:*:*:*|61?f??:*:*:*) ax_gcc_arch="bdver2 bdver1 amdfam10 k8" ;;
+	    *06??f??:*:*:*|6??f??:*:*:*) ax_gcc_arch="bdver3 bdver2 bdver1 amdfam10 k8" ;;
+	    *070?f??:*:*:*|70?f??:*:*:*) ax_gcc_arch="btver2 btver1 amdfam10 k8" ;;
+	    *???f??:*:*:*) ax_gcc_arch="amdfam10 k8" ;;
           esac ;;
-	*:746e6543:*:*) # IDT
+	*:746e6543:736c7561:48727561) # IDT / VIA (Centaur)
 	   case $ax_cv_gcc_x86_cpuid_1 in
 	     *54?:*:*:*) ax_gcc_arch=winchip-c6 ;;
-	     *58?:*:*:*) ax_gcc_arch=winchip2 ;;
+	     *5[[89]]?:*:*:*) ax_gcc_arch=winchip2 ;;
+	     *66?:*:*:*) ax_gcc_arch=winchip2 ;;
 	     *6[[78]]?:*:*:*) ax_gcc_arch=c3 ;;
-	     *69?:*:*:*) ax_gcc_arch="c3-2 c3" ;;
+	     *6[[9adf]]?:*:*:*) ax_gcc_arch="c3-2 c3" ;;
 	   esac ;;
      esac
      if test x"$ax_gcc_arch" = x; then # fallback
@@ -155,7 +165,7 @@
   sparc*)
      AC_PATH_PROG([PRTDIAG], [prtdiag], [prtdiag], [$PATH:/usr/platform/`uname -i`/sbin/:/usr/platform/`uname -m`/sbin/])
      cputype=`(((grep cpu /proc/cpuinfo | cut -d: -f2) ; ($PRTDIAG -v |grep -i sparc) ; grep -i cpu /var/run/dmesg.boot ) | head -n 1) 2> /dev/null`
-     cputype=`echo "$cputype" | tr -d ' -' | sed 's/SPARCIIi/SPARCII/' | tr $as_cr_LETTERS $as_cr_letters`
+     cputype=`echo "$cputype" | tr -d ' -' | $SED 's/SPARCIIi/SPARCII/' |tr $as_cr_LETTERS $as_cr_letters`
      case $cputype in
          *ultrasparciv*) ax_gcc_arch="ultrasparc4 ultrasparc3 ultrasparc v9" ;;
          *ultrasparciii*) ax_gcc_arch="ultrasparc3 ultrasparc v9" ;;
@@ -177,8 +187,8 @@
   alphaev79) ax_gcc_arch="ev79 ev7 ev69 ev68 ev67" ;;
 
   powerpc*)
-     cputype=`((grep cpu /proc/cpuinfo | head -n 1 | cut -d: -f2 | cut -d, -f1 | sed 's/ //g') ; /usr/bin/machine ; /bin/machine; grep CPU /var/run/dmesg.boot | head -n 1 | cut -d" " -f2) 2> /dev/null`
-     cputype=`echo $cputype | sed -e 's/ppc//g;s/ *//g'`
+     cputype=`((grep cpu /proc/cpuinfo | head -n 1 | cut -d: -f2 | cut -d, -f1 | $SED 's/ //g') ; /usr/bin/machine ; /bin/machine; grep CPU /var/run/dmesg.boot | head -n 1 | cut -d" " -f2) 2> /dev/null`
+     cputype=`echo $cputype | $SED -e 's/ppc//g;s/ *//g'`
      case $cputype in
        *750*) ax_gcc_arch="750 G3" ;;
        *740[[0-9]]*) ax_gcc_arch="$cputype 7400 G4" ;;
@@ -192,22 +202,50 @@
      esac
      ax_gcc_arch="$ax_gcc_arch powerpc"
      ;;
+  aarch64)
+     cpuimpl=`grep 'CPU implementer' /proc/cpuinfo 2> /dev/null | cut -d: -f2 | tr -d " " | head -n 1`
+     cpuarch=`grep 'CPU architecture' /proc/cpuinfo 2> /dev/null | cut -d: -f2 | tr -d " " | head -n 1`
+     cpuvar=`grep 'CPU variant' /proc/cpuinfo 2> /dev/null | cut -d: -f2 | tr -d " " | head -n 1`
+     case $cpuimpl in
+       0x42) case $cpuarch in
+               8) case $cpuvar in
+                    0x0) ax_gcc_arch="thunderx2t99 vulcan armv8.1-a armv8-a+lse armv8-a native" ;;
+                  esac
+                  ;;
+             esac
+             ;;
+       0x43) case $cpuarch in
+               8) case $cpuvar in
+                    0x0) ax_gcc_arch="thunderx armv8-a native" ;;
+                    0x1) ax_gcc_arch="thunderx+lse armv8.1-a armv8-a+lse armv8-a native" ;;
+                  esac
+                  ;;
+             esac
+             ;;
+      esac
+      ;;
 esac
 fi # not cross-compiling
 fi # guess arch
 
 if test "x$ax_gcc_arch" != x -a "x$ax_gcc_arch" != xno; then
-for arch in $ax_gcc_arch; do
-  if test "x[]m4_default([$1],yes)" = xyes; then # if we require portable code
-    flags="-mtune=$arch"
-    # -mcpu=$arch and m$arch generate nonportable code on every arch except
-    # x86.  And some other arches (e.g. Alpha) don't accept -mtune.  Grrr.
-    case $host_cpu in i*86|x86_64*) flags="$flags -mcpu=$arch -m$arch";; esac
-  else
-    flags="-march=$arch -mcpu=$arch -m$arch"
-  fi
-  for flag in $flags; do
-    AX_CHECK_COMPILE_FLAG($flag, [ax_cv_gcc_archflag=$flag; break])
+if test "x[]m4_default([$1],yes)" = xyes; then # if we require portable code
+  flag_prefixes="-mtune="
+  if test "x$ax_cv_[]_AC_LANG_ABBREV[]_compiler_vendor" = xclang; then flag_prefixes="-march="; fi
+  # -mcpu=$arch and m$arch generate nonportable code on every arch except
+  # x86.  And some other arches (e.g. Alpha) don't accept -mtune.  Grrr.
+  case $host_cpu in i*86|x86_64*|amd64*) flag_prefixes="$flag_prefixes -mcpu= -m";; esac
+else
+  flag_prefixes="-march= -mcpu= -m"
+fi
+for flag_prefix in $flag_prefixes; do
+  for arch in $ax_gcc_arch; do
+    flag="$flag_prefix$arch"
+    AX_CHECK_COMPILE_FLAG($flag, [if test "x$ax_cv_[]_AC_LANG_ABBREV[]_compiler_vendor" = xclang; then
+      if test "x[]m4_default([$1],yes)" = xyes; then
+	if test "x$flag" = "x-march=$arch"; then flag=-mtune=$arch; fi
+      fi
+    fi; ax_cv_gcc_archflag=$flag; break])
   done
   test "x$ax_cv_gcc_archflag" = xunknown || break
 done
diff --git a/m4/ax_gcc_x86_cpuid.m4 b/m4/ax_gcc_x86_cpuid.m4
index 7d46fee..df95465 100644
--- a/m4/ax_gcc_x86_cpuid.m4
+++ b/m4/ax_gcc_x86_cpuid.m4
@@ -1,17 +1,19 @@
 # ===========================================================================
-#     http://www.gnu.org/software/autoconf-archive/ax_gcc_x86_cpuid.html
+#     https://www.gnu.org/software/autoconf-archive/ax_gcc_x86_cpuid.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
 #   AX_GCC_X86_CPUID(OP)
+#   AX_GCC_X86_CPUID_COUNT(OP, COUNT)
 #
 # DESCRIPTION
 #
 #   On Pentium and later x86 processors, with gcc or a compiler that has a
 #   compatible syntax for inline assembly instructions, run a small program
 #   that executes the cpuid instruction with input OP. This can be used to
-#   detect the CPU type.
+#   detect the CPU type. AX_GCC_X86_CPUID_COUNT takes an additional COUNT
+#   parameter that gets passed into register ECX before calling cpuid.
 #
 #   On output, the values of the eax, ebx, ecx, and edx registers are stored
 #   as hexadecimal strings as "eax:ebx:ecx:edx" in the cache variable
@@ -28,6 +30,7 @@
 #
 #   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
 #   Copyright (c) 2008 Matteo Frigo
+#   Copyright (c) 2015 Michael Petch <mpetch@capp-sysware.com>
 #
 #   This program is free software: you can redistribute it and/or modify it
 #   under the terms of the GNU General Public License as published by the
@@ -40,7 +43,7 @@
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#   with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
@@ -55,18 +58,25 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 7
+#serial 10
 
 AC_DEFUN([AX_GCC_X86_CPUID],
+[AX_GCC_X86_CPUID_COUNT($1, 0)
+])
+
+AC_DEFUN([AX_GCC_X86_CPUID_COUNT],
 [AC_REQUIRE([AC_PROG_CC])
 AC_LANG_PUSH([C])
 AC_CACHE_CHECK(for x86 cpuid $1 output, ax_cv_gcc_x86_cpuid_$1,
  [AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>], [
-     int op = $1, eax, ebx, ecx, edx;
+     int op = $1, level = $2, eax, ebx, ecx, edx;
      FILE *f;
-      __asm__("cpuid"
-        : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx)
-        : "a" (op));
+      __asm__ __volatile__ ("xchg %%ebx, %1\n"
+        "cpuid\n"
+        "xchg %%ebx, %1\n"
+        : "=a" (eax), "=r" (ebx), "=c" (ecx), "=d" (edx)
+        : "a" (op), "2" (level));
+
      f = fopen("conftest_cpuid", "w"); if (!f) return 1;
      fprintf(f, "%x:%x:%x:%x\n", eax, ebx, ecx, edx);
      fclose(f);