On 06/05/16 07:35, David Wohlferd wrote: > 1) I'm not clear precisely what problem this patch fixes. It's true > that some people have incorrectly assumed that basic asm clobbers > memory and this change would fix their code. But some people also > incorrectly assume it clobbers registers. I assume that's why Jeff > Law proposed making basic asm "an opaque blob that > read/write/clobber any register or memory location."
A few more things: Jeff Law did propose this, but it's impossible to do because it inevitably causes reload failures. My argument in support of Bernd's proposal is that it makes sense from a *practical* software reliability point of view. It wouldn't hurt, and might fix some significant bugs. It's similar to the targets which always implicitly clobber "cc". It corresponds to what I always assumed basic asm did, and I'm sure that I'm not alone. This change might fix some real bugs and it is extremely unlikely to break anything. Andrew.
