Hard to find it via google. Here's MIPS-gcc for windows.
I can do no better than give this link, which works as of 2021 and will do so until mentor take it down, although it's been up since 2013..
https://sourcery.mentor.com/public/gnu_toolchain/mips-sde-elf/mips-2013.11-37-mips-sde-elf.exe
If this link is dead, look for 'mips-2013.11-37-mips-sde-elf.exe'
