75 lines
1.9 KiB
Text
75 lines
1.9 KiB
Text
|
#
|
||
|
|
# SYNOPSIS
|
||
|
|
#
|
||
|
|
# TUKLIB_INTEGER
|
||
|
|
#
|
||
|
|
# DESCRIPTION
|
||
|
|
#
|
||
|
|
# Checks for tuklib_integer.h:
|
||
|
|
# - Endianness
|
||
|
|
# - Does operating system provide byte swapping macros
|
||
|
|
# - Does the hardware support fast unaligned access to 16-bit
|
||
|
|
# and 32-bit integers
|
||
|
|
#
|
||
|
|
# COPYING
|
||
|
|
#
|
||
|
|
# Author: Lasse Collin
|
||
|
|
#
|
||
|
|
# This file has been put into the public domain.
|
||
|
|
# You can do whatever you want with this file.
|
||
|
|
#
|
||
|
|
|
||
|
|
AC_DEFUN_ONCE([TUKLIB_INTEGER], [
|
||
|
|
AC_REQUIRE([TUKLIB_COMMON])
|
||
|
|
AC_REQUIRE([AC_C_BIGENDIAN])
|
||
|
|
AC_CHECK_HEADERS([byteswap.h sys/endian.h sys/byteorder.h], [break])
|
||
|
|
|
||
|
|
# Even if we have byteswap.h, we may lack the specific macros/functions.
|
||
|
|
if test x$ac_cv_header_byteswap_h = xyes ; then
|
||
|
|
m4_foreach([FUNC], [bswap_16,bswap_32,bswap_64], [
|
||
|
|
AC_MSG_CHECKING([if FUNC is available])
|
||
|
|
AC_LINK_IFELSE([AC_LANG_SOURCE([
|
||
|
|
#include <byteswap.h>
|
||
|
|
int
|
||
|
|
main(void)
|
||
|
|
{
|
||
|
|
FUNC[](42);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
])], [
|
||
|
|
AC_DEFINE(HAVE_[]m4_toupper(FUNC), [1],
|
||
|
|
[Define to 1 if] FUNC [is available.])
|
||
|
|
AC_MSG_RESULT([yes])
|
||
|
|
], [AC_MSG_RESULT([no])])
|
||
|
|
|
||
|
|
])dnl
|
||
|
|
fi
|
||
|
|
|
||
|
|
AC_MSG_CHECKING([if unaligned memory access should be used])
|
||
|
|
AC_ARG_ENABLE([unaligned-access], AC_HELP_STRING([--enable-unaligned-access],
|
||
|
|
[Enable if the system supports *fast* unaligned memory access
|
||
|
|
with 16-bit and 32-bit integers. By default, this is enabled
|
||
|
|
only on x86, x86_64, and big endian PowerPC.]),
|
||
|
|
[], [enable_unaligned_access=auto])
|
||
|
|
if test "x$enable_unaligned_access" = xauto ; then
|
||
|
|
# TODO: There may be other architectures, on which unaligned access
|
||
|
|
# is OK.
|
||
|
|
case $host_cpu in
|
||
|
|
i?86|x86_64|powerpc|powerpc64)
|
||
|
|
enable_unaligned_access=yes
|
||
|
|
;;
|
||
|
|
*)
|
||
|
|
enable_unaligned_access=no
|
||
|
|
;;
|
||
|
|
esac
|
||
|
|
fi
|
||
|
|
if test "x$enable_unaligned_access" = xyes ; then
|
||
|
|
AC_DEFINE([TUKLIB_FAST_UNALIGNED_ACCESS], [1], [Define to 1 if
|
||
|
|
the system supports fast unaligned access to 16-bit and
|
||
|
|
32-bit integers.])
|
||
|
|
AC_MSG_RESULT([yes])
|
||
|
|
else
|
||
|
|
AC_MSG_RESULT([no])
|
||
|
|
fi
|
||
|
|
])dnl
|