Hello: The Principles of Operation states:
"An instruction can designate the same general register both for address computation and as the location of an operand. Address computation is completed before registers, if any, are changed by the operation." Consider this code: 01988A 98EC 9464 19A98 42272 LM R14,R12,CHKSU_SAVE 01988E 48F0 94A0 19AD4 42273 LH R15,SURC 019892 07FE 42274 BR R14 R9 is being used as the base to restore registers 14-->12 from. Will R9 be valid for the complete instruction, or will the new (restored) R9 be used to restore the remaining registers 10--> 12? The above quote from the POO seems to imply that R9 will be valid, but this code has abended intermittently on the LM instruction with R9 being the bad address. (Code prior to this which is based on R9 works ok, so the contents of R9 are good up to the point of the LM instruction.) Thank you for any insight you can provide. Paul ---------------------------------------------------------------------- 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
