Article View: comp.lang.asm370
Article #487Re: Need string handling macros
From: Lewis T. Flynn
Date: Fri, 09 Nov 1990 19:39
Date: Fri, 09 Nov 1990 19:39
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In article <9011081730.AA21056@ucbvax.Berkeley.EDU> IBM 370 Assembly Programming Discussion List <ASM370@OHSTVMA.BITNET> writes: >> If you're coding in 370 Assembler, then simply use the equivalent >> machine instructions. SUBSTR ends up being either an EX (Execute) of >> an MVC (Move) instruction for "short" strings ... > >Better, use MVCK. The length is expected to be in a register so you Uhhh, I don't think so. On most machines, this instruction should be slower than MVCL and has the side effect of needing to know the correct key (using the wrong one will generate a privileged operation exception in problem state). Plus this will only work for for lengths of 256 or less. The suggested EX of an MVC will be substantially faster on nearly all machines for this case and a pure MVC will be faster yet. Terry
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!apple!amdahl!terry From: terry@uts.amdahl.com (Lewis T. Flynn) Newsgroups: comp.lang.asm370 Subject: Re: Need string handling macros Message-ID: <b68i029Ze3Kc01@amdahl.uts.amdahl.com> Date: 9 Nov 90 19:39:21 GMT References: <9011081730.AA21056@ucbvax.Berkeley.EDU> Reply-To: terry@amdahl.uts.amdahl.com (Lewis T. Flynn) Distribution: inet Organization: Amdahl Corporation, Sunnyvale CA Lines: 15