C /256KiB/256/ > Sorry, I was referring to MVCLE not needing a loop for <=256.
Why doesn't it require a loop? Even if you assume that IBM would never choose a cutoff that short, there's still the issue of page faults. -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Assembler List [[email protected]] on behalf of Ed Jaffe [[email protected]] Sent: Wednesday, October 21, 2020 1:46 PM To: [email protected] Subject: Re: Conditional MVCL macro? On 10/21/2020 10:36 AM, Seymour J Metz wrote: > Which? Either is subject to an access violation crossing page boundaries. For > MVCL, I don't know of any special significance to 256KiB. For MVCOS, assuming > no page fault, 256 < 4096, but I don't know of any significance of 256 rather > than, e.g., 128, 512; you don't need the loop for any length <= 4096. Sorry, I was referring to MVCLE not needing a loop for <=256. -- Phoenix Software International Edward E. Jaffe 831 Parkview Drive North El Segundo, CA 90245 https://secure-web.cisco.com/1fQDOgZJ-EtWej9tooT9n7558pLlFCTmto_ZaXQShV-Mxuy1OVcIE4koC422wB0t3Cb509A0KiNZf6JQbkU3V9oYAwxAigHL9E2bu9nPh_BFHl5zqCfyJ9xdYAvgWJyBJbG_NkF4Vh6JG-sdB0DlFXamdQew5uwoHaJL9k353T-SnTfFL6BGOSYXH4CihxGy1i2qP7NF0xeLz0M8ur3TX46wSFzKU-1GjaSLxHyMsVCSF0_C-KhJRm-0uLsbVOsqhcCxhnKV1mRu9nv-QsmJR2467RJexHnLE3kaQkUBbKdL8jTn0dBiG_a0eVE1-CT-yvX4OItNSH7SCEMZJqu4zkyn4wmjX5H4bIZc7bLh2kNXf8PcpITnhdZLmAZXzFo-QweWyQW7rUhct_UN2-r1zYdaXxbVh0DZ4Ak3U-upVhoTntJvSthSmFS_SKy1wEY7j/https%3A%2F%2Fwww.phoenixsoftware.com%2F -------------------------------------------------------------------------------- This e-mail message, including any attachments, appended messages and the information contained therein, is for the sole use of the intended recipient(s). If you are not an intended recipient or have otherwise received this email message in error, any use, dissemination, distribution, review, storage or copying of this e-mail message and the information contained therein is strictly prohibited. If you are not an intended recipient, please contact the sender by reply e-mail and destroy all copies of this email message and do not otherwise utilize or retain this email message or any or all of the information contained therein. Although this email message and any attachments or appended messages are believed to be free of any virus or other defect that might affect any computer system into which it is received and opened, it is the responsibility of the recipient to ensure that it is virus free and no responsibility is accepted by the sender for any loss or damage arising in any way from its opening or use.
