On Fri, 16 Dec 2022 16:57:54 +0000 David Laight <David.Laight@xxxxxxxxxx> wrote: > > I don't know m68k assembly, but I'm guessing the (%O)+ and the (%1)+ only > > modifies the register being used, and no memory is being touched. > > Memory is being read so a clobber is needed to ensure that all pending > writes have been done. > Although, in this case, the memory being read is effectively > read only so nothing should be I would think that if the memory being read is the address of what the input parameters being passed into it are, then the compiler should be smart enough to know that there's a relation. Especially if the input parameters are pointers. I assumed that "memory" was for memory unrelated to the input constraints. -- Steve
