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Commit ef1d59a1 authored by Jakob Stoklund Olesen's avatar Jakob Stoklund Olesen
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Implement SPARCv9 atomic_swap_64 with a pseudo. 

The SWAP instruction only exists in a 32-bit variant, but the 64-bit
atomic swap can be implemented in terms of CASX, like the other atomic
rmw primitives.

llvm-svn: 200453
parent 5b630b4e
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