This is just a short heads-up for out-of-tree targets relying on the concept of
pristine registers. I slightly changed their semantics in r238524 (see
http://reviews.llvm.org/D10101 <http://reviews.llvm.org/D10101> for
details). If you happened to not use the RegisterScavenger to get liveness past
the PrologueEpilogue inserted and relied on MachineFrameInfo::getPristineRegs()
without at same time relying on the machine basic blocks live-in sets then you
may be affected by it.
- Matthias
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