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

[Ulrich Kulisch <ulrich.kulisch@xxxxxxx>]

Thank you Michel

for citing this document! I just forgot it in the list of my mail of June 28. There are other documents available discussing these operations together with interval arithmetic. I just copy the citation from my book:

[714] IBM, ACRITH–XSC: IBM High Accuracy Arithmetic – Extended Scientific Computation.
Version 1, Release 1, IBM Deutschland GmbH (Department 3282, Schönaicher
Strasse 220, D-71032 Böblingen), 1990.
1. General Information, GC33-6461-01.
2. Reference, SC33-6462-00.
3. Sample Programs, SC33-6463-00.
4. How To Use, SC33-6464-00.
5. Syntax Diagrams, SC33-6466-00.

Best regards
Ulrich





Am 03.07.2013 01:57, schrieb Michel Hack:

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

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