River Riddle 1bd14ce392 [mlir] Use double format when parsing bfloat16 hexadecimal values
Summary: bfloat16 doesn't have a valid APFloat format, so we have to use double semantics when storing it. This change makes sure that hexadecimal values can be round-tripped properly given this fact.

Reviewed By: mehdi_amini

Differential Revision: https://reviews.llvm.org/D72667
2020-01-14 13:56:22 -08:00
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