https://issues.dlang.org/show_bug.cgi?id=12832
--- Comment #2 from Walter Bright <[email protected]> --- What's happening is in iasm.d the operand size is encoded into 5 bit flags, and there isn't room for another _128 bit, so the assembler just accepts any size. The solution is to refactor the way operand sizes are encoded to accept more values. --
