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* [Matrix] Use fmuladd for matrix.multiply if allowed.Florian Hahn2019-12-231-0/+69
If the matrix.multiply calls have the contract fast math flag, we can use fmuladd. This als adds a command line option to force fmuladd generation. We can retire this option once there is a clang-level option. Reviewers: anemet, Gerolf, hfinkel, andrew.w.kaylor Reviewed By: anemet Differential Revision: https://reviews.llvm.org/D70951
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