http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58330
Alan Modra <amodra at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |amodra at gmail dot com --- Comment #2 from Alan Modra <amodra at gmail dot com> --- I think this is a backend problem, specifically with bswapdi2_64bit accepting a DImode mem then splitting to two SImode. Potential fix is to add && !(MEM_P (operands[0]) && MEM_VOLATILE_P (operands[0])) && !(MEM_P (operands[1]) && MEM_VOLATILE_P (operands[1])) to the insn condition.