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Function std.math.fma
Returns (x * y) + z, rounding only once according to the
current rounding mode.
Prototype
real fma( real x, real y, real z ) pure nothrow @nogc @safe;
BUGS
Not currently implemented - rounds twice.
Authors
Walter Bright, Don Clugston, Conversion of CEPHES math library to D by Iain Buclaw