In a message dated 7/18/2005 7:31:40 A.M. Central Daylight Time, [EMAIL PROTECTED] writes:
A zap is a zap. I see no difference in degree of difficulty patching one bit, 12 bits, or 16. The real problem with patching a literal is that it might be referenced by more than one instruction. Right. There is no difference in difficulty. My point was that if the needed zap involves changing a constant of 4095 to 4096, then you can't do it by zapping a 12-bit displacement in a LA instruction but you can do it if affected instruction is using a halfword, either as a literal or named. >And LHI is not available as a solution when you are >writing code that might execute on non-z/Arch. processors, of which there are >still just a few in existence. > > What????! LHI was available *long* before z/Architecture!! My error. I never learned about it until I saw it in the z/Arch. Princ. of Ops. book and thought it was new then. Bill Fairchild ---------------------------------------------------------------------- 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
