dnl Copyright (C) 2012  Xiph.org Foundation
dnl
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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