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Add autoconf macro to check for the bswap16 intrinsic.

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Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
This commit is contained in:
Ralph Giles
2014-11-04 11:57:28 -08:00
committed by Erik de Castro Lopo
parent e0fbe71935
commit 1f30b3e711
1 changed files with 28 additions and 1 deletions
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29
m4/bswap.m4
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@@ -1,4 +1,4 @@
dnl Copyright (C) 2012 Xiph.org Foundation dnl Copyright (C) 2012-2014 Xiph.org Foundation
dnl dnl
dnl Redistribution and use in source and binary forms, with or without dnl Redistribution and use in source and binary forms, with or without
dnl modification, are permitted provided that the following conditions dnl modification, are permitted provided that the following conditions
@@ -53,3 +53,30 @@ AC_DEFUN([XIPH_C_BSWAP32],
)] )]
)# XIPH_C_BSWAP32 )# 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 instrinsic,
ac_cv_c_bswap16,
# Initialize to no
ac_cv_c_bswap16=no
HAVE_BSWAP16=0
[AC_TRY_LINK([],
return __builtin_bswap16 (0) ;,
ac_cv_c_bswap16=yes
HAVE_BSWAP16=1
)]
AC_DEFINE_UNQUOTED(HAVE_BSWAP16, ${HAVE_BSWAP16},
[Compiler has the __builtin_bswap16 intrinsic])
)]
)# XIPH_C_BSWAP16