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On Tuesday 15 December 2009 18:01, Jim Grosbach wrote: > For a usage example, I've included in the patch the modification to > use the constraint for the STREX ARM instruction. Your example is: constraints = "@early $success" Why not spell it as: constraints = "$success != $src", "$success != $ptr" The grammar would change to something like:

All, I've attached a small patch that adds a new early-clobber operand constraint option to TableGen and would like to get feedback before proceding. As background, the ARM store-exclusive instruction (STREX) stores a success result code in a register operand, and that register cannot be the same register as either the source of the value to be stored, or the base address.

...uot; means. Perhaps spelling it out more fully with "earlyclobber" rather than "early" would help? Thanks for the feedback! -Jim -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20091215/b5ad25f8/attachment.html>