[boost] equivalent for 'pause' mnemonic on ARM - or boost.pref?

Hi, does someone know an equivalent of x86 'pause' mnemonic for ARMv6? Raspbian (-march=armv6) and Debian armel (-march=armv4) seam no to accept The 'yield' mnemonic seams no to be right in both cases. Or does boost.predef's BOOST_ARCH_ARM give a hint for both cases? ty, Oliver