| dnl Copyright (C) 2012 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(has bswap32 instrinsic, |
| ac_cv_c_bswap, |
| |
| # Initialize to no |
| ac_cv_c_bswap=no |
| HAVE_BSWAP32=0 |
| |
| [AC_TRY_LINK([], |
| return __builtin_bswap32 (0) ;, |
| ac_cv_c_bswap=yes |
| HAVE_BSWAP32=1 |
| )] |
| AC_DEFINE_UNQUOTED(HAVE_BSWAP32, ${HAVE_BSWAP32}, |
| [Compiler has the __builtin_bswap32 intrinsic]) |
| |
| )] |
| )# XIPH_C_BSWAP32 |