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Diffstat (limited to 'm4/bswap.m4')
| -rw-r--r-- | m4/bswap.m4 | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/m4/bswap.m4 b/m4/bswap.m4 new file mode 100644 index 0000000..b1abae9 --- /dev/null +++ b/m4/bswap.m4 @@ -0,0 +1,66 @@ +dnl Copyright (C) 2012-2023 Xiph.Org Foundation +dnl +dnl Redistribution and use in source and binary forms, with or without +dnl modification, are permitted provided that the following conditions +dnl are met: +dnl +dnl - Redistributions of source code must retain the above copyright +dnl notice, this list of conditions and the following disclaimer. +dnl +dnl - Redistributions in binary form must reproduce the above copyright +dnl notice, this list of conditions and the following disclaimer in the +dnl documentation and/or other materials provided with the distribution. +dnl +dnl - Neither the name of the Xiph.org Foundation nor the names of its +dnl contributors may be used to endorse or promote products derived from +dnl this software without specific prior written permission. +dnl +dnl THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +dnl ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +dnl LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +dnl A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR +dnl CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, +dnl EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, +dnl PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR +dnl PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF +dnl LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING +dnl NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +dnl SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + +dnl @synopsis XIPH_C_BSWAP32 +dnl +dnl @author Erik de Castro Lopo <erikd@mega-nerd.com> +dnl +dnl Dtermine whether the compiler has the __builtin_bswap32() intrinsic which +dnl is likely to be present for most versions of GCC as well as Clang. + +AC_DEFUN([XIPH_C_BSWAP32], +[AC_CACHE_CHECK(for bswap32 intrinsic, + ac_cv_c_bswap32, + + AC_LINK_IFELSE([AC_LANG_PROGRAM([], [[return __builtin_bswap32 (0) ;]])],[ac_cv_c_bswap32=yes],[ac_cv_c_bswap32=no]) + if test $ac_cv_c_bswap32 = yes; then + AC_DEFINE_UNQUOTED(HAVE_BSWAP32, [1], [Compiler has the __builtin_bswap32 intrinsic]) + fi + )] +)# XIPH_C_BSWAP32 + + +dnl @synopsis XIPH_C_BSWAP16 +dnl +dnl @author Erik de Castro Lopo <erikd@mega-nerd.com> +dnl +dnl Dtermine whether the compiler has the __builtin_bswap16() intrinsic which +dnl is likely to be present for most versions of GCC as well as Clang. + +AC_DEFUN([XIPH_C_BSWAP16], +[AC_CACHE_CHECK(for bswap16 intrinsic, + ac_cv_c_bswap16, + + AC_LINK_IFELSE([AC_LANG_PROGRAM([], [[return __builtin_bswap16 (0) ;]])],[ac_cv_c_bswap16=yes],[ac_cv_c_bswap16=no]) + if test $ac_cv_c_bswap16 = yes; then + AC_DEFINE_UNQUOTED(HAVE_BSWAP16, [1], [Compiler has the __builtin_bswap16 intrinsic]) + fi + )] +)# XIPH_C_BSWAP16 |