The MIPS code for SpiderMonkey's JITs has been broken for a while now and
there has been some discussion about removing it. Even though it was never
a Tier 1 platform, MIPS support still affects code elsewhere in the engine
(things like condition codes for example) and people still spend time
implementing and fixing MIPS code when making platform-specific changes.
Future changes like Cranelift integration likely also require significant
Given all this, I'd like to propose removing the MIPS code two weeks from
now. Let me know if you have any questions or concerns.