Input = doubleword, output = quadword. The text "formed from" seems pretty clear to me.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [[email protected]] on behalf of Paul Gilmartin [[email protected]] Sent: Wednesday, January 11, 2023 11:08 AM To: [email protected] Subject: Re: Question and CZAM and IPL On Wed, 11 Jan 2023 15:56:02 +0000, Seymour J Metz wrote: >The quoted text is on page 10-56 (p. 1072 in the PDF) of a227832d.pdf, the >June 2022 edition of z/Architecture Principles of Operation, SA22-7832-13. >What is the issue with "doubleword"? > If it replaces a 16-byte PSW it should be a quadword. (Or does it mean "the content of the location designated by the doubleword at the second-operand address"?) >________________________________________ > >On Wed, 11 Jan 2023 15:30:25 +0000, Seymour J Metz wrote:2 > >>Standard nomenclature for System/360, inherited through Z, is >> >> Halfword (16 bits) >> Word (32 bits) >> Doubleword (64 bits) >> >>Quadword (128 bits) is newer. >> >If you supply a citation, I'll submit an RCF. > >_______________________________________ >>On Wed, 11 Jan 2023 14:03:24 +0000, Seymour J Metz wrote: >> >>>"The current PSW is replaced by a 16-byte PSW >>>formed from the contents of the doubleword at the >>>location designated by the second-operand address. >>>Figure 4-3 on page 4-8 illustrates the contents of the >>>second operand." >>> >>"doubleword"? -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
