On Wed, 11 Jan 2023 10:18:14 -0600, Jay Maynard wrote: >Basically, LPSW takes a doubleword, rearranges the bits, and makes a >quadword out of it that it then loads into the PSW. > Now that I have the citation, I see (I have the -12; I'm guessing the -13 is similar) how much is concealed behind the seemingly innocuous "formed from".
How much compatibility does this provide with pre-z code that manipulates PSWs? (I've never coded an LPSW) >> 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"? >> > >> >_______________________________________ >> >>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
