An adder that reduces three numbers to two, a sum and a carry, without propagating carries. Made of independent full adders per bit, its delay is constant, so multipliers use it to add many partial products.
Field: Computer Arithmetic
A carry-save adder is just full adders placed independently per bit, reducing three numbers to two (the per-bit sums and the per-bit carries) without waiting for carry propagation, so its delay is a constant one full-adder level.
Why are carry-save adders used to sum the many partial prod…Carry-lookahead adder Arithmetic shift bfloat16 Booth's algorithm Catastrophic cancellation Exponent field Fixed point Floating-point absorption FP8 Fused multiply-add