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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:
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dnl - Redistributions of source code must retain the above copyright
dnl notice, this list of conditions and the following disclaimer.
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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