On Sat, Dec 15, 2018 at 09:26:45PM +0000, Paul Burton wrote: > > The really nice but less compatible fix would be to let processes or > > even the whole system opt out by promising not to put anything in FPU > > branch delay slots, of course. > > The ultimate fix comes with a switch to the nanoMIPS ISA which has no > delay slots :) I don't understand the MIPS position that introducing new ISAs (including silently-new like r6) and not supporting or deprecating support for the old one is a solution to anything. If one doesn't care about the ability to run existing binaries for your platform, one might as well switch to RISC-V or ARM or whatever. The whole advantage of an ISA as a "platform" is the ability to run existing software and use existing tooling (not just compilers; think also JITs, FFI frameworks, etc), not any particular design advantage the ISA has. Rich
