ax_ext
======

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

Source Code
***********

Download the latest version of ax_ext.m4 (http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob_plain;f=m4/ax_ext.m4) or browse the macro's revision history (http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=history;f=m4/ax_ext.m4).

License
*******

Copyright © 2007 Christophe Tournayre turn3r@users.sourceforge.net
 Copyright © 2013,2015 Michael Petch mpetch@capp-sysware.com
 Copyright © 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.