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Actual support for softening f16 operations is still limited, and can be added when it's needed. But Soften is much closer to being a useful thing to try than keeping it Legal when no registers can actually hold such values. Longer term, we probably want something between Soften and Promote semantics for most targets, it'll be more efficient to promote the 4 basic operations to f32 than libcall them. llvm-svn: 213372
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