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Re: On behalf of Jim Demmel -- back to the roots

Hong Diep Nguyen wrote:
> Scheme (1) assumes there is an operation that adds/subtracts
> long accumulators.

The S/370 implementation did have these operations.  The spare bits
at the top (that permit long sums to be accumulated) also allow many
long-accumulator sums to be performed without overflow.

Reference:  High Accuracy Arithmetic, IBM publication SA22-7093 (1984)

Michel.
---Sent: 2013-07-03 00:02:35 UTC