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Also would a single MULTPLUS rtx be sufficient? I remember seeing a number of operand negatation variants when you improved the fmadd support for the rs6000. Can these all be handled by allowing NEG operands to MULTPLUS or were they just canonicalizing the RTL to ensure that the fmadd instruction gets used?
All variants like fms, fnma etc. can be expressed in terms of negation and fma. I have no idea however what the best way is to canonicalize these.
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