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...add an additional parameter to indicate whether enhanced intermediate precision is required? Because that would break a lot of existing backends? —Owen -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150128/5f0f9370/attachment.html>

Hi, I would like to add an ISD node for an fmad operation (named either FMAD or FMULADD). It will have the semantics of returning the same result as the separate multiply and add with the intermediate rounding step, and not a differently rounded result. The motivation is to share code with the various FMA forming DAG combines, but will be generally more useful on targets that support it