diff --git a/Makefile.am b/Makefile.am
index cbeb7385..75175057 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -29,6 +29,3 @@ dist_doc_DATA = CHANGES README.md LICENSE
 EXTRA_DIST = m4
 
 test: check
-
-luaclean:
-	$(MAKE) -C "$(srcdir)/luajit" clean
diff --git a/configure.ac b/configure.ac
index 4ca574de..53e3b006 100644
--- a/configure.ac
+++ b/configure.ac
@@ -46,8 +46,8 @@ AC_ARG_WITH([extra-ldflags], [AS_HELP_STRING([--with-extra-ldflags=CFLAGS], [Add
 ])
 
 # Checks for support.
-AC_CHECK_LIB([dl], [dlopen])
-AC_CHECK_LIB([m], [sqrt])
+AX_EXT
+AC_HEADER_TIME
 AX_PTHREAD
 AX_PCAP_THREAD_PCAP
 AC_CHECK_LIB([ev], [ev_now], [], AC_MSG_ERROR([libev not found]))
diff --git a/examples/Makefile.am b/examples/Makefile.am
index 5f6b8228..15e2937d 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -16,7 +16,5 @@
 # You should have received a copy of the GNU General Public License
 # along with dnsjit.  If not, see <http://www.gnu.org/licenses/>.
 
-dist_doc_DATA = dumpdns.lua \
-  filter_rcode.lua \
-  replay.lua \
-  test_throughput.lua
+dist_doc_DATA = dumpdns.lua dumpdns-qr.lua filter_rcode.lua playqr.lua \
+  readme.lua replay.lua test_pcap_read.lua test_throughput.lua
diff --git a/m4/ax_check_compile_flag.m4 b/m4/ax_check_compile_flag.m4
new file mode 100644
index 00000000..dcabb92a
--- /dev/null
+++ b/m4/ax_check_compile_flag.m4
@@ -0,0 +1,74 @@
+# ===========================================================================
+#  https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
+#
+# DESCRIPTION
+#
+#   Check whether the given FLAG works with the current language's compiler
+#   or gives an error.  (Warnings, however, are ignored)
+#
+#   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
+#   success/failure.
+#
+#   If EXTRA-FLAGS is defined, it is added to the current language's default
+#   flags (e.g. CFLAGS) when the check is done.  The check is thus made with
+#   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.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
+#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.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
+#   Free Software Foundation, either version 3 of the License, or (at your
+#   option) any later version.
+#
+#   This program is distributed in the hope that it will be useful, but
+#   WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+#   Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License along
+#   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
+#   scripts that are the output of Autoconf when processing the Macro. You
+#   need not follow the terms of the GNU General Public License when using
+#   or distributing such scripts, even though portions of the text of the
+#   Macro appear in them. The GNU General Public License (GPL) does govern
+#   all other use of the material that constitutes the Autoconf Macro.
+#
+#   This special exception to the GPL applies to versions of the Autoconf
+#   Macro released by the Autoconf Archive. When you make and distribute a
+#   modified version of the Autoconf Macro, you may extend this special
+#   exception to the GPL to apply to your modified version as well.
+
+#serial 5
+
+AC_DEFUN([AX_CHECK_COMPILE_FLAG],
+[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([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_VAR_IF(CACHEVAR,yes,
+  [m4_default([$2], :)],
+  [m4_default([$3], :)])
+AS_VAR_POPDEF([CACHEVAR])dnl
+])dnl AX_CHECK_COMPILE_FLAGS
diff --git a/m4/ax_ext.m4 b/m4/ax_ext.m4
new file mode 100644
index 00000000..66de4c32
--- /dev/null
+++ b/m4/ax_ext.m4
@@ -0,0 +1,328 @@
+# ===========================================================================
+#          https://www.gnu.org/software/autoconf-archive/ax_ext.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_EXT
+#
+# DESCRIPTION
+#
+#   Find supported SIMD extensions by requesting cpuid. When a SIMD
+#   extension is found, the -m"simdextensionname" is added to SIMD_FLAGS if
+#   compiler supports it. For example, if "sse2" is available then "-msse2"
+#   is added to SIMD_FLAGS.
+#
+#   Find other supported CPU extensions by requesting cpuid. When a
+#   processor extension is found, the -m"extensionname" is added to
+#   CPUEXT_FLAGS if compiler supports it. For example, if "bmi2" is
+#   available then "-mbmi2" is added to CPUEXT_FLAGS.
+#
+#   This macro calls:
+#
+#     AC_SUBST(SIMD_FLAGS)
+#     AC_SUBST(CPUEXT_FLAGS)
+#
+#   And defines:
+#
+#     HAVE_RDRND / HAVE_BMI1 / HAVE_BMI2 / HAVE_ADX / HAVE_MPX
+#     HAVE_PREFETCHWT1 / HAVE_ABM / HAVE_MMX / HAVE_SSE / HAVE_SSE2
+#     HAVE_SSE3 / HAVE_SSSE3 / HAVE_SSE4_1 / HAVE_SSE4_2 / HAVE_SSE4a
+#     HAVE_SHA / HAVE_AES / HAVE_AVX / HAVE_FMA3 / HAVE_FMA4 / HAVE_XOP
+#     HAVE_AVX2 / HAVE_AVX512_F / HAVE_AVX512_CD / HAVE_AVX512_PF
+#     HAVE_AVX512_ER / HAVE_AVX512_VL / HAVE_AVX512_BW / HAVE_AVX512_DQ
+#     HAVE_AVX512_IFMA / HAVE_AVX512_VBMI / HAVE_ALTIVEC / HAVE_VSX
+#
+# LICENSE
+#
+#   Copyright (c) 2007 Christophe Tournayre <turn3r@users.sourceforge.net>
+#   Copyright (c) 2013,2015 Michael Petch <mpetch@capp-sysware.com>
+#   Copyright (c) 2017 Rafael de Lucena Valle <rafaeldelucena@gmail.com>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 17
+
+AC_DEFUN([AX_EXT],
+[
+  AC_REQUIRE([AC_CANONICAL_HOST])
+  AC_REQUIRE([AC_PROG_CC])
+
+  CPUEXT_FLAGS=""
+  SIMD_FLAGS=""
+
+  case $host_cpu in
+    powerpc*)
+      AC_CACHE_CHECK([whether altivec is supported for old distros], [ax_cv_have_altivec_old_ext],
+          [
+            if test `/usr/sbin/sysctl -a 2>/dev/null| grep -c hw.optional.altivec` != 0; then
+                if test `/usr/sbin/sysctl -n hw.optional.altivec` = 1; then
+                  ax_cv_have_altivec_old_ext=yes
+                fi
+            fi
+          ])
+
+          if test "$ax_cv_have_altivec_old_ext" = yes; then
+            AC_DEFINE(HAVE_ALTIVEC,,[Support Altivec instructions])
+            AX_CHECK_COMPILE_FLAG(-faltivec, SIMD_FLAGS="$SIMD_FLAGS -faltivec", [])
+          fi
+
+      AC_CACHE_CHECK([whether altivec is supported], [ax_cv_have_altivec_ext],
+          [
+            if test `LD_SHOW_AUXV=1 /bin/true 2>/dev/null|grep -c altivec` != 0; then
+              ax_cv_have_altivec_ext=yes
+            fi
+          ])
+
+          if test "$ax_cv_have_altivec_ext" = yes; then
+            AC_DEFINE(HAVE_ALTIVEC,,[Support Altivec instructions])
+            AX_CHECK_COMPILE_FLAG(-maltivec, SIMD_FLAGS="$SIMD_FLAGS -maltivec", [])
+          fi
+
+      AC_CACHE_CHECK([whether vsx is supported], [ax_cv_have_vsx_ext],
+          [
+            if test `LD_SHOW_AUXV=1 /bin/true 2>/dev/null|grep -c vsx` != 0; then
+                ax_cv_have_vsx_ext=yes
+            fi
+          ])
+
+          if test "$ax_cv_have_vsx_ext" = yes; then
+            AC_DEFINE(HAVE_VSX,,[Support VSX instructions])
+            AX_CHECK_COMPILE_FLAG(-mvsx, SIMD_FLAGS="$SIMD_FLAGS -mvsx", [])
+          fi
+    ;;
+
+    i[[3456]]86*|x86_64*|amd64*)
+
+      AC_REQUIRE([AX_GCC_X86_CPUID])
+      AC_REQUIRE([AX_GCC_X86_CPUID_COUNT])
+      AC_REQUIRE([AX_GCC_X86_AVX_XGETBV])
+
+      eax_cpuid0=0
+      AX_GCC_X86_CPUID(0x00000000)
+      if test "$ax_cv_gcc_x86_cpuid_0x00000000" != "unknown";
+      then
+        eax_cpuid0=`echo $ax_cv_gcc_x86_cpuid_0x00000000 | cut -d ":" -f 1`
+      fi
+
+      eax_cpuid80000000=0
+      AX_GCC_X86_CPUID(0x80000000)
+      if test "$ax_cv_gcc_x86_cpuid_0x80000000" != "unknown";
+      then
+        eax_cpuid80000000=`echo $ax_cv_gcc_x86_cpuid_0x80000000 | cut -d ":" -f 1`
+      fi
+
+      ecx_cpuid1=0
+      edx_cpuid1=0
+      if test "$((0x$eax_cpuid0))" -ge 1 ; then
+        AX_GCC_X86_CPUID(0x00000001)
+        if test "$ax_cv_gcc_x86_cpuid_0x00000001" != "unknown";
+        then
+          ecx_cpuid1=`echo $ax_cv_gcc_x86_cpuid_0x00000001 | cut -d ":" -f 3`
+          edx_cpuid1=`echo $ax_cv_gcc_x86_cpuid_0x00000001 | cut -d ":" -f 4`
+        fi
+      fi
+
+      ebx_cpuid7=0
+      ecx_cpuid7=0
+      if test "$((0x$eax_cpuid0))" -ge 7 ; then
+        AX_GCC_X86_CPUID_COUNT(0x00000007, 0x00)
+        if test "$ax_cv_gcc_x86_cpuid_0x00000007" != "unknown";
+        then
+          ebx_cpuid7=`echo $ax_cv_gcc_x86_cpuid_0x00000007 | cut -d ":" -f 2`
+          ecx_cpuid7=`echo $ax_cv_gcc_x86_cpuid_0x00000007 | cut -d ":" -f 3`
+        fi
+      fi
+
+      ecx_cpuid80000001=0
+      edx_cpuid80000001=0
+      if test "$((0x$eax_cpuid80000000))" -ge "$((0x80000001))" ; then
+        AX_GCC_X86_CPUID(0x80000001)
+        if test "$ax_cv_gcc_x86_cpuid_0x80000001" != "unknown";
+        then
+          ecx_cpuid80000001=`echo $ax_cv_gcc_x86_cpuid_0x80000001 | cut -d ":" -f 3`
+          edx_cpuid80000001=`echo $ax_cv_gcc_x86_cpuid_0x80000001 | cut -d ":" -f 4`
+        fi
+      fi
+
+      AC_CACHE_VAL([ax_cv_have_mmx_os_support_ext],
+      [
+        ax_cv_have_mmx_os_support_ext=yes
+      ])
+
+      ax_cv_have_none_os_support_ext=yes
+
+      AC_CACHE_VAL([ax_cv_have_sse_os_support_ext],
+      [
+        ax_cv_have_sse_os_support_ext=no,
+        if test "$((0x$edx_cpuid1>>25&0x01))" = 1; then
+          AC_LANG_PUSH([C])
+          AC_TRY_RUN([
+#include <signal.h>
+#include <stdlib.h>
+            /* No way at ring1 to ring3 in protected mode to check the CR0 and CR4
+               control registers directly. Execute an SSE instruction.
+               If it raises SIGILL then OS doesn't support SSE based instructions */
+            void sig_handler(int signum){ exit(1); }
+            int main(){
+              signal(SIGILL, sig_handler);
+              /* SSE instruction xorps  %xmm0,%xmm0 */
+              __asm__ __volatile__ (".byte 0x0f, 0x57, 0xc0");
+              return 0;
+            }],
+            ax_cv_have_sse_os_support_ext=yes,
+            ax_cv_have_sse_os_support_ext=no,
+            ax_cv_have_sse_os_support_ext=no)
+          AC_LANG_POP([C])
+        fi
+      ])
+
+      xgetbv_eax=0
+      if test "$((0x$ecx_cpuid1>>28&0x01))" = 1; then
+        AX_GCC_X86_AVX_XGETBV(0x00000000)
+
+        if test x"$ax_cv_gcc_x86_avx_xgetbv_0x00000000" != x"unknown"; then
+          xgetbv_eax=`echo $ax_cv_gcc_x86_avx_xgetbv_0x00000000 | cut -d ":" -f 1`
+        fi
+
+        AC_CACHE_VAL([ax_cv_have_avx_os_support_ext],
+        [
+          ax_cv_have_avx_os_support_ext=no
+          if test "$((0x$ecx_cpuid1>>27&0x01))" = 1; then
+            if test "$((0x$xgetbv_eax&0x6))" = 6; then
+              ax_cv_have_avx_os_support_ext=yes
+            fi
+          fi
+        ])
+      fi
+
+      AC_CACHE_VAL([ax_cv_have_avx512_os_support_ext],
+      [
+        ax_cv_have_avx512_os_support_ext=no
+        if test "$ax_cv_have_avx_os_support_ext" = yes; then
+          if test "$((0x$xgetbv_eax&0xe6))" = "$((0xe6))"; then
+            ax_cv_have_avx512_os_support_ext=yes
+          fi
+        fi
+      ])
+
+      for ac_instr_info dnl
+      in "none;rdrnd;RDRND;ecx_cpuid1,30;-mrdrnd;HAVE_RDRND;CPUEXT_FLAGS" dnl
+         "none;bmi1;BMI1;ebx_cpuid7,3;-mbmi;HAVE_BMI1;CPUEXT_FLAGS" dnl
+         "none;bmi2;BMI2;ebx_cpuid7,8;-mbmi2;HAVE_BMI2;CPUEXT_FLAGS" dnl
+         "none;adx;ADX;ebx_cpuid7,19;-madx;HAVE_ADX;CPUEXT_FLAGS" dnl
+         "none;mpx;MPX;ebx_cpuid7,14;-mmpx;HAVE_MPX;CPUEXT_FLAGS" dnl
+         "none;prefetchwt1;PREFETCHWT1;ecx_cpuid7,0;-mprefetchwt1;HAVE_PREFETCHWT1;CPUEXT_FLAGS" dnl
+         "none;abm;ABM;ecx_cpuid80000001,5;-mabm;HAVE_ABM;CPUEXT_FLAGS" dnl
+         "mmx;mmx;MMX;edx_cpuid1,23;-mmmx;HAVE_MMX;SIMD_FLAGS" dnl
+         "sse;sse;SSE;edx_cpuid1,25;-msse;HAVE_SSE;SIMD_FLAGS" dnl
+         "sse;sse2;SSE2;edx_cpuid1,26;-msse2;HAVE_SSE2;SIMD_FLAGS" dnl
+         "sse;sse3;SSE3;ecx_cpuid1,1;-msse3;HAVE_SSE3;SIMD_FLAGS" dnl
+         "sse;ssse3;SSSE3;ecx_cpuid1,9;-mssse3;HAVE_SSSE3;SIMD_FLAGS" dnl
+         "sse;sse41;SSE4.1;ecx_cpuid1,19;-msse4.1;HAVE_SSE4_1;SIMD_FLAGS" dnl
+         "sse;sse42;SSE4.2;ecx_cpuid1,20;-msse4.2;HAVE_SSE4_2;SIMD_FLAGS" dnl
+         "sse;sse4a;SSE4a;ecx_cpuid80000001,6;-msse4a;HAVE_SSE4a;SIMD_FLAGS" dnl
+         "sse;sha;SHA;ebx_cpuid7,29;-msha;HAVE_SHA;SIMD_FLAGS" dnl
+         "sse;aes;AES;ecx_cpuid1,25;-maes;HAVE_AES;SIMD_FLAGS" dnl
+         "avx;avx;AVX;ecx_cpuid1,28;-mavx;HAVE_AVX;SIMD_FLAGS" dnl
+         "avx;fma3;FMA3;ecx_cpuid1,12;-mfma;HAVE_FMA3;SIMD_FLAGS" dnl
+         "avx;fma4;FMA4;ecx_cpuid80000001,16;-mfma4;HAVE_FMA4;SIMD_FLAGS" dnl
+         "avx;xop;XOP;ecx_cpuid80000001,11;-mxop;HAVE_XOP;SIMD_FLAGS" dnl
+         "avx;avx2;AVX2;ebx_cpuid7,5;-mavx2;HAVE_AVX2;SIMD_FLAGS" dnl
+         "avx512;avx512f;AVX512-F;ebx_cpuid7,16;-mavx512f;HAVE_AVX512_F;SIMD_FLAGS" dnl
+         "avx512;avx512cd;AVX512-CD;ebx_cpuid7,28;-mavx512cd;HAVE_AVX512_CD;SIMD_FLAGS" dnl
+         "avx512;avx512pf;AVX512-PF;ebx_cpuid7,26;-mavx512pf;HAVE_AVX512_PF;SIMD_FLAGS" dnl
+         "avx512;avx512er;AVX512-ER;ebx_cpuid7,27;-mavx512er;HAVE_AVX512_ER;SIMD_FLAGS" dnl
+         "avx512;avx512vl;AVX512-VL;ebx_cpuid7,31;-mavx512vl;HAVE_AVX512_VL;SIMD_FLAGS" dnl
+         "avx512;avx512bw;AVX512-BW;ebx_cpuid7,30;-mavx512bw;HAVE_AVX512_BW;SIMD_FLAGS" dnl
+         "avx512;avx512dq;AVX512-DQ;ebx_cpuid7,17;-mavx512dq;HAVE_AVX512_DQ;SIMD_FLAGS" dnl
+         "avx512;avx512ifma;AVX512-IFMA;ebx_cpuid7,21;-mavx512ifma;HAVE_AVX512_IFMA;SIMD_FLAGS" dnl
+         "avx512;avx512vbmi;AVX512-VBMI;ecx_cpuid7,1;-mavx512vbmi;HAVE_AVX512_VBMI;SIMD_FLAGS" dnl
+         #
+      do ac_instr_os_support=$(eval echo \$ax_cv_have_$(echo $ac_instr_info | cut -d ";" -f 1)_os_support_ext)
+         ac_instr_acvar=$(echo $ac_instr_info | cut -d ";" -f 2)
+         ac_instr_shortname=$(echo $ac_instr_info | cut -d ";" -f 3)
+         ac_instr_chk_loc=$(echo $ac_instr_info | cut -d ";" -f 4)
+         ac_instr_chk_reg=0x$(eval echo \$$(echo $ac_instr_chk_loc | cut -d "," -f 1))
+         ac_instr_chk_bit=$(echo $ac_instr_chk_loc | cut -d "," -f 2)
+         ac_instr_compiler_flags=$(echo $ac_instr_info | cut -d ";" -f 5)
+         ac_instr_have_define=$(echo $ac_instr_info | cut -d ";" -f 6)
+         ac_instr_flag_type=$(echo $ac_instr_info | cut -d ";" -f 7)
+
+         AC_CACHE_CHECK([whether ${ac_instr_shortname} is supported by the processor], [ax_cv_have_${ac_instr_acvar}_cpu_ext],
+         [
+           eval ax_cv_have_${ac_instr_acvar}_cpu_ext=no
+           if test "$((${ac_instr_chk_reg}>>${ac_instr_chk_bit}&0x01))" = 1 ; then
+             eval ax_cv_have_${ac_instr_acvar}_cpu_ext=yes
+           fi
+         ])
+
+         if test x"$(eval echo \$ax_cv_have_${ac_instr_acvar}_cpu_ext)" = x"yes"; then
+           AC_CACHE_CHECK([whether ${ac_instr_shortname} is supported by the processor and OS], [ax_cv_have_${ac_instr_acvar}_ext],
+           [
+             eval ax_cv_have_${ac_instr_acvar}_ext=no
+             if test x"${ac_instr_os_support}" = x"yes"; then
+               eval ax_cv_have_${ac_instr_acvar}_ext=yes
+             fi
+           ])
+
+           if test "$(eval echo \$ax_cv_have_${ac_instr_acvar}_ext)" = yes; then
+             AX_CHECK_COMPILE_FLAG(${ac_instr_compiler_flags}, eval ax_cv_support_${ac_instr_acvar}_ext=yes,
+                                                               eval ax_cv_support_${ac_instr_acvar}_ext=no)
+             if test x"$(eval echo \$ax_cv_support_${ac_instr_acvar}_ext)" = x"yes"; then
+               eval ${ac_instr_flag_type}=\"\$${ac_instr_flag_type} ${ac_instr_compiler_flags}\"
+               AC_DEFINE_UNQUOTED([${ac_instr_have_define}])
+             else
+               AC_MSG_WARN([Your processor and OS supports ${ac_instr_shortname} instructions but not your compiler, can you try another compiler?])
+             fi
+           else
+             if test x"${ac_instr_os_support}" = x"no"; then
+               AC_CACHE_VAL(ax_cv_support_${ac_instr_acvar}_ext, eval ax_cv_support_${ac_instr_acvar}_ext=no)
+               AC_MSG_WARN([Your processor supports ${ac_instr_shortname}, but your OS doesn't])
+             fi
+           fi
+         else
+           AC_CACHE_VAL(ax_cv_have_${ac_instr_acvar}_ext, eval ax_cv_have_${ac_instr_acvar}_ext=no)
+           AC_CACHE_VAL(ax_cv_support_${ac_instr_acvar}_ext, eval ax_cv_support_${ac_instr_acvar}_ext=no)
+         fi
+      done
+  ;;
+  esac
+
+  AH_TEMPLATE([HAVE_RDRND],[Define to 1 to support Digital Random Number Generator])
+  AH_TEMPLATE([HAVE_BMI1],[Define to 1 to support Bit Manipulation Instruction Set 1])
+  AH_TEMPLATE([HAVE_BMI2],[Define to 1 to support Bit Manipulation Instruction Set 2])
+  AH_TEMPLATE([HAVE_ADX],[Define to 1 to support Multi-Precision Add-Carry Instruction Extensions])
+  AH_TEMPLATE([HAVE_MPX],[Define to 1 to support Memory Protection Extensions])
+  AH_TEMPLATE([HAVE_PREFETCHWT1],[Define to 1 to support Prefetch Vector Data Into Caches WT1])
+  AH_TEMPLATE([HAVE_ABM],[Define to 1 to support Advanced Bit Manipulation])
+  AH_TEMPLATE([HAVE_MMX],[Define to 1 to support Multimedia Extensions])
+  AH_TEMPLATE([HAVE_SSE],[Define to 1 to support Streaming SIMD Extensions])
+  AH_TEMPLATE([HAVE_SSE2],[Define to 1 to support Streaming SIMD Extensions])
+  AH_TEMPLATE([HAVE_SSE3],[Define to 1 to support Streaming SIMD Extensions 3])
+  AH_TEMPLATE([HAVE_SSSE3],[Define to 1 to support Supplemental Streaming SIMD Extensions 3])
+  AH_TEMPLATE([HAVE_SSE4_1],[Define to 1 to support Streaming SIMD Extensions 4.1])
+  AH_TEMPLATE([HAVE_SSE4_2],[Define to 1 to support Streaming SIMD Extensions 4.2])
+  AH_TEMPLATE([HAVE_SSE4a],[Define to 1 to support AMD Streaming SIMD Extensions 4a])
+  AH_TEMPLATE([HAVE_SHA],[Define to 1 to support Secure Hash Algorithm Extension])
+  AH_TEMPLATE([HAVE_AES],[Define to 1 to support Advanced Encryption Standard New Instruction Set (AES-NI)])
+  AH_TEMPLATE([HAVE_AVX],[Define to 1 to support Advanced Vector Extensions])
+  AH_TEMPLATE([HAVE_FMA3],[Define to 1 to support  Fused Multiply-Add Extensions 3])
+  AH_TEMPLATE([HAVE_FMA4],[Define to 1 to support Fused Multiply-Add Extensions 4])
+  AH_TEMPLATE([HAVE_XOP],[Define to 1 to support eXtended Operations Extensions])
+  AH_TEMPLATE([HAVE_AVX2],[Define to 1 to support Advanced Vector Extensions 2])
+  AH_TEMPLATE([HAVE_AVX512_F],[Define to 1 to support AVX-512 Foundation Extensions])
+  AH_TEMPLATE([HAVE_AVX512_CD],[Define to 1 to support AVX-512 Conflict Detection Instructions])
+  AH_TEMPLATE([HAVE_AVX512_PF],[Define to 1 to support AVX-512 Conflict Prefetch Instructions])
+  AH_TEMPLATE([HAVE_AVX512_ER],[Define to 1 to support AVX-512 Exponential & Reciprocal Instructions])
+  AH_TEMPLATE([HAVE_AVX512_VL],[Define to 1 to support AVX-512 Vector Length Extensions])
+  AH_TEMPLATE([HAVE_AVX512_BW],[Define to 1 to support AVX-512 Byte and Word Instructions])
+  AH_TEMPLATE([HAVE_AVX512_DQ],[Define to 1 to support AVX-512 Doubleword and Quadword Instructions])
+  AH_TEMPLATE([HAVE_AVX512_IFMA],[Define to 1 to support AVX-512 Integer Fused Multiply Add Instructions])
+  AH_TEMPLATE([HAVE_AVX512_VBMI],[Define to 1 to support AVX-512 Vector Byte Manipulation Instructions])
+  AC_SUBST(SIMD_FLAGS)
+  AC_SUBST(CPUEXT_FLAGS)
+])
diff --git a/m4/ax_gcc_x86_avx_xgetbv.m4 b/m4/ax_gcc_x86_avx_xgetbv.m4
new file mode 100644
index 00000000..a57fc5ee
--- /dev/null
+++ b/m4/ax_gcc_x86_avx_xgetbv.m4
@@ -0,0 +1,79 @@
+# ===========================================================================
+#  https://www.gnu.org/software/autoconf-archive/ax_gcc_x86_avx_xgetbv.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_GCC_X86_AVX_XGETBV
+#
+# DESCRIPTION
+#
+#   On later x86 processors with AVX SIMD support, with gcc or a compiler
+#   that has a compatible syntax for inline assembly instructions, run a
+#   small program that executes the xgetbv instruction with input OP. This
+#   can be used to detect if the OS supports AVX instruction usage.
+#
+#   On output, the values of the eax and edx registers are stored as
+#   hexadecimal strings as "eax:edx" in the cache variable
+#   ax_cv_gcc_x86_avx_xgetbv.
+#
+#   If the xgetbv instruction fails (because you are running a
+#   cross-compiler, or because you are not using gcc, or because you are on
+#   a processor that doesn't have this instruction),
+#   ax_cv_gcc_x86_avx_xgetbv_OP is set to the string "unknown".
+#
+#   This macro mainly exists to be used in AX_EXT.
+#
+# LICENSE
+#
+#   Copyright (c) 2013 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
+#   Free Software Foundation, either version 3 of the License, or (at your
+#   option) any later version.
+#
+#   This program is distributed in the hope that it will be useful, but
+#   WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+#   Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License along
+#   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
+#   scripts that are the output of Autoconf when processing the Macro. You
+#   need not follow the terms of the GNU General Public License when using
+#   or distributing such scripts, even though portions of the text of the
+#   Macro appear in them. The GNU General Public License (GPL) does govern
+#   all other use of the material that constitutes the Autoconf Macro.
+#
+#   This special exception to the GPL applies to versions of the Autoconf
+#   Macro released by the Autoconf Archive. When you make and distribute a
+#   modified version of the Autoconf Macro, you may extend this special
+#   exception to the GPL to apply to your modified version as well.
+
+#serial 3
+
+AC_DEFUN([AX_GCC_X86_AVX_XGETBV],
+[AC_REQUIRE([AC_PROG_CC])
+AC_LANG_PUSH([C])
+AC_CACHE_CHECK(for x86-AVX xgetbv $1 output, ax_cv_gcc_x86_avx_xgetbv_$1,
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>], [
+     int op = $1, eax, edx;
+     FILE *f;
+      /* Opcodes for xgetbv */
+      __asm__ __volatile__ (".byte 0x0f, 0x01, 0xd0"
+        : "=a" (eax), "=d" (edx)
+        : "c" (op));
+     f = fopen("conftest_xgetbv", "w"); if (!f) return 1;
+     fprintf(f, "%x:%x\n", eax, edx);
+     fclose(f);
+     return 0;
+])],
+     [ax_cv_gcc_x86_avx_xgetbv_$1=`cat conftest_xgetbv`; rm -f conftest_xgetbv],
+     [ax_cv_gcc_x86_avx_xgetbv_$1=unknown; rm -f conftest_xgetbv],
+     [ax_cv_gcc_x86_avx_xgetbv_$1=unknown])])
+AC_LANG_POP([C])
+])
diff --git a/m4/ax_gcc_x86_cpuid.m4 b/m4/ax_gcc_x86_cpuid.m4
new file mode 100644
index 00000000..df954658
--- /dev/null
+++ b/m4/ax_gcc_x86_cpuid.m4
@@ -0,0 +1,89 @@
+# ===========================================================================
+#     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. 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
+#   ax_cv_gcc_x86_cpuid_OP.
+#
+#   If the cpuid instruction fails (because you are running a
+#   cross-compiler, or because you are not using gcc, or because you are on
+#   a processor that doesn't have this instruction), ax_cv_gcc_x86_cpuid_OP
+#   is set to the string "unknown".
+#
+#   This macro mainly exists to be used in AX_GCC_ARCHFLAG.
+#
+# LICENSE
+#
+#   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
+#   Free Software Foundation, either version 3 of the License, or (at your
+#   option) any later version.
+#
+#   This program is distributed in the hope that it will be useful, but
+#   WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+#   Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License along
+#   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
+#   scripts that are the output of Autoconf when processing the Macro. You
+#   need not follow the terms of the GNU General Public License when using
+#   or distributing such scripts, even though portions of the text of the
+#   Macro appear in them. The GNU General Public License (GPL) does govern
+#   all other use of the material that constitutes the Autoconf Macro.
+#
+#   This special exception to the GPL applies to versions of the Autoconf
+#   Macro released by the Autoconf Archive. When you make and distribute a
+#   modified version of the Autoconf Macro, you may extend this special
+#   exception to the GPL to apply to your modified version as well.
+
+#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, level = $2, eax, ebx, ecx, edx;
+     FILE *f;
+      __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);
+     return 0;
+])],
+     [ax_cv_gcc_x86_cpuid_$1=`cat conftest_cpuid`; rm -f conftest_cpuid],
+     [ax_cv_gcc_x86_cpuid_$1=unknown; rm -f conftest_cpuid],
+     [ax_cv_gcc_x86_cpuid_$1=unknown])])
+AC_LANG_POP([C])
+])
diff --git a/m4/ax_pthread.m4 b/m4/ax_pthread.m4
index 4c4051ea..5fbf9fe0 100644
--- a/m4/ax_pthread.m4
+++ b/m4/ax_pthread.m4
@@ -1,5 +1,5 @@
 # ===========================================================================
-#        http://www.gnu.org/software/autoconf-archive/ax_pthread.html
+#        https://www.gnu.org/software/autoconf-archive/ax_pthread.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -67,7 +67,7 @@
 #   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
@@ -82,7 +82,7 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 23
+#serial 24
 
 AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
 AC_DEFUN([AX_PTHREAD], [
diff --git a/m4/dl.sh b/m4/dl.sh
new file mode 100755
index 00000000..33a720b1
--- /dev/null
+++ b/m4/dl.sh
@@ -0,0 +1,27 @@
+#!/bin/sh -e
+# Copyright (c) 2018, OARC, Inc.
+# All rights reserved.
+#
+# This file is part of dnsjit.
+#
+# dnsjit is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# dnsjit is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with dnsjit.  If not, see <http://www.gnu.org/licenses/>.
+
+m4_files="ax_append_flag.m4 ax_cflags_warn_all.m4 ax_ext.m4 ax_pthread.m4
+ ax_require_defined.m4 ax_gcc_x86_avx_xgetbv.m4 ax_gcc_x86_cpuid.m4
+ ax_check_compile_flag.m4"
+
+for ax in $m4_files; do
+  rm -f "$ax"
+  wget -O "$ax" "http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob_plain;f=m4/$ax"
+done
diff --git a/src/Makefile.am b/src/Makefile.am
index ae45358e..3ea3b446 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -23,6 +23,7 @@ CLEANFILES =
 
 AM_CFLAGS = -I$(srcdir) \
   -I$(top_srcdir) \
+  $(SIMD_FLAGS) $(CPUEXT_FLAGS) \
   $(PTHREAD_CFLAGS) \
   $(luajit_CFLAGS)
 
diff --git a/src/core/channel.c b/src/core/channel.c
index 917db762..c78c2c12 100644
--- a/src/core/channel.c
+++ b/src/core/channel.c
@@ -127,7 +127,7 @@ int core_channel_put(core_channel_t* self, core_object_t* obj)
         return 1;
     }
 
-    while (!ck_ring_enqueue_spsc((ck_ring_t*)self->ring, (ck_ring_buffer_t*)self->ring_buf, &obj)) {
+    while (!ck_ring_enqueue_spsc((ck_ring_t*)self->ring, (ck_ring_buffer_t*)self->ring_buf, (void*)obj)) {
         sched_yield();
     }
 #else
diff --git a/src/core/thread.c b/src/core/thread.c
index f553801b..917ec918 100644
--- a/src/core/thread.c
+++ b/src/core/thread.c
@@ -134,7 +134,7 @@ int core_thread_stop(core_thread_t* self)
     return 0;
 }
 
-inline void _push(core_thread_t* self, core_thread_item_t* item)
+inline static void _push(core_thread_t* self, core_thread_item_t* item)
 {
     if (pthread_mutex_lock(&self->lock)) {
         lfatal("mutex lock failed");