I am in the midst of a CPU optimization exercise for a COBOL program and ran across the following code sequence generated by the compiler:
MVI 254(3),X'40' MVC 255(119,3),254(3) This code is generated in response to a simple COBOL "MOVE SPACES TO variable" instruction, where the variable is 120 bytes long. Did I or did I not see some discussion here or perhaps in a SHARE presentation that on a z10 machine overlapping/destructive moves wreck the pipeline and take *much* longer to execute as a result? Or am I imagining that? The reason I ask is that Strobe highlights this place in the code as a high-usage point, and I am struggling to understand why. TIA for any info you can provide. Peter This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
