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* configure.ac: fix build on systems without SIMD supportVadim Yanitskiy2017-05-111-3/+4
| | | | | | | HAVE_AVX2, HAVE_SSE3 and HAVE_SSE4_1 were never defined if CPU architecture doesn't match the (86*|x86_64*|amd64*) condition. Change-Id: If0c3128f9768f95c1f5f955db242e71c81384c6c
* configure.ac: add SIMD detection capabilitiesVadim Yanitskiy2017-05-072-0/+156
| | | | | | | | | | | | | | | | | | | This change adds a check whether compiler supports some SIMD (Single Instruction, Multiple Data) instructions. It is enabled by default, and can be disabled by configure option --disable-simd. The check macro is based on the AX_EXT from autoconf-archive: www.gnu.org/software/autoconf-archive/ax_ext.html And depends on the ax_check_compile_flag macro: www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html Currently only the following SIMD extensions are being checked: AVX2, SSE3, SSE4.1, but adding others is also possible. All found extensions are being defined in the 'config.h' header. Change-Id: Idf8fff984bd936a75c7c307338df88ba4b005817
* Create a dummy m4 directory to make autoreconf --install --force workHolger Hans Peter Freyther2010-03-241-0/+1
Even when removing AC_CONFIG_MACRO_DIR aclocal insisted that it needs to have a m4 directory. Make it happy by providing one. As git is not tracking directories I needed to add a dummy file.