Re:LLVM Backend for the VideoCore4, Raspberry Pi 2 VPU
by krasin on Monday May 02, 2016 @02:30PM
(#11614101)
Out-of-tree targets for LLVM are generally a bad idea given how fast LLVM is changed. Every change could break the out-of-tree target, and being out-of-tree, there's no way the upstream developers could notice that.
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Re:LLVM Backend for the VideoCore4, Raspberry Pi 2 VPU
by sklogic on Tuesday May 03, 2016 @04:39AM
(#11618895)
The other side of this approach is that when the mainline developers do not have much love to a particular platform, it is dropped altogether with little to no remorse - see the fate of Microblaze support, or even the good ol' C backend.
I wish we had a more stable API (maybe with a transformation layer) for the backends that may not probably need much of the new features. If LLVM had a maintained transformation layer from the "current" SelectionDAG to a stable one, it would have helped a lot.