Obviously not or you would be downloading rust from the official site. 
The situation is similar to ARM Linux support (not a tier-1 platform either) where the stage0 snapshots were cross-compiled by @japaric and made available for download. You should study his project's page first (the amd64 part) and try replicating the cross-compilation procedure for your own architecture.
EDIT:
Unless you're going to cross-compile (cross-bootstrap) each time, I'd suggest checking out the necessary revision and building a stage0 equivalent right away:
git clone --recursive https://github.com/rust-lang/rust
cd rust
git reset --hard 1af31d4
Followed by the steps from the script. This way you'll gain the ability to build rust natively on you powerPC.
EDIT 2015-12-23
There's a new stage0 snapshot @commit 3391630