UMADD64

Format: UMADD64 dest, source1, source2, source3RHS, source3LHS, sourcePredCarryIn

Phase0: UMADD64 FT0, S0{.NEG}{.ABS}, S1{.NEG}{.ABS}, S2{.NEG}{.ABS}, IS0{.NEG}{.ABS}, (P0|_)

Phase1: -

Phase2: -

Description: Unsigned 64-bit multiply and add with carry-in bit.

FT0 = S0 * S1 + (IS0<<32 | S2) [+P0]