Nigel Stephens wrote: > Thiemo Seufer wrote: > >GNU as has "move" as builtin macro which is expanded differently for > >32 and 64 bit mode. This simplifies the task of writing code for both > >models. Unfortunately the expansion was broken for a while and > >generated always the 64 bit version if the toolchain was 64bit > >_capable_. IIRC this was fixed in the early 2.14 timeframe. > > Wouldn't it be safer, as Kevin suggests, for the "move" macro to > generate "or $rd,$0,$rs", since that will work correctly in either mode? For CPUs with two adders the instruction scheduling is a bit better. Ther are also many other macros which are expanded in dependence of the 32/64 bit address/register size, a different "move" macro expansion won't help much if the assembler invocation was wrong. Thiemo
