On Jan 26, 2007, at 1:08 PM, Lauro Ramos Venancio wrote: > Hi Chris, > > In ARM v4/v5 specification, mul %r0, %r0, %r1 (r0 = r0*r1) is invalid, > but mul %r0, %r1, %r0 is valid. With early-clobber constraint, ARM > backend wouldn't emit the the mul %r0, %r1, %r0. We need a constraint > only for the first source register.
Yep, makes sense. It would be nice if the mechanism you guys invent can *also* handle early-clobber, even if it's not a one-to-one mapping. For example, use of early clobber could translate into a bunch of != constraints. -Chris _______________________________________________ llvm-commits mailing list llvm-commits@cs.uiuc.edu http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
