On Tue, May 30, 2017 at 02:39:51PM -0700, Kees Cook wrote: > The coming x86 refcount protection needs to be able to add trailing > instructions to the GEN_*_RMWcc() operations. This extracts the > difference between the goto/non-goto cases so the helper macros > can be defined outside the #ifdef cases. Additionally adds argument > naming to the resulting asm for referencing from suffixed > instructions, and adds clobbers for "cc", and "cx" to let suffixes > use _ASM_CX, and retain any set flags. Another option is to simply require __GCC_ASM_FLAG_OUTPUT__ for the fast refcount stuff. That would result in simpler and more readable code.
