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We don't currently have any runtime library functions for operations on f16 values (other than conversions to and from f32 and f64), so we should always promote it to f32, even if that is not a legal type. In that case, the f32 values would be softened to f32 library calls. SoftenFloatRes_FP_EXTEND now needs to check the promoted operand's type, as it may ne a no-op or require a different library call. getCopyFromParts and getCopyToParts now need to cope with a floating-point value stored in a larger integer part, as is the case for any target that needs to store an f16 value in a 32-bit integer register. Differential Revision: http://reviews.llvm.org/D12856 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252459 91177308-0d34-0410-b5e6-96231b3b80d8
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