Hi All: In gcc internal, section 16.19.8, there is a rule about "define_insn_reservation" like: "`condition` defines what RTL insns are described by this construction. You should re- member that you will be in trouble if `condition` for two or more different `define_insn_ reservation` constructors if TRUE for an insn".
While in mips.md, pipeline description for each processor are included along with generic.md, which providing a fallback for processor without specific pipeline description. Here is the PUZZLE: Won't `define_insn_reservation` constructors from both specific processor's and the generic md file break the rule mentioned before? For example, It seems conditions for the r3k_load(from 3000.md) and generic_load(from generic.md) are both TRUE for lw insn. Further more, In those md files for specific processors, It is said that these description are supposed to override parts of generic md file, but i don't know how it works without reading codes in genautomata.c. Please help me out, Thanks very much. -- Best Regards.
