zizhar added a comment. You understood corectly :)
After going a bit through the log, I think that there is no reason for clang to not detect it, probably the check was just forgotten. This patch is the check. "r" constraint means (taken from the spec:) A register operand is allowed provided that it is in a general register. ("%rcx") means - use the register rcx. http://reviews.llvm.org/D15075 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits