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Hello LLVM Developers, We are working on extending currently available register rematerialization to include cases where sequence of multiple instructions is required to rematerialize a value. We had a discussion on this in community mailing list and link is here: http://lists.llvm.org/pipermail/llvm-dev/2016-September/subject.html#104777 >From the above discussion and studying the code we

...othing that *removes* %reg2559 from the remat map when it is spilled. Probably this is a very rare thing because it's rarer to spill registers that were results of earlier spills (it only happens if they are split-reused) and it's even rarer that the original register just happens to be rematter and EVEN RARER that the instruction using the result of the second spill happens to get folded by LiveIntervals and THEN unfolded by LocalSpiller. I believe that there's also a bug in unfolding. Rather than returning %reg2559 as the target reg when the ADD64mr is unfolded it should return %r...