Peter Farley wrote: <begin snippet> . . . I plead ignorance for the PL/1 and Fortran compilers, but the C/C++ compiler is the nly current compiler in my personal experience that actually exhibits a knowledge of instruction timings and latency and AGI interrupts, etc., for current and recent pipelined "z" processors. </end snippet>
The IBM optimizing machinery for C/C++ and PL/I is now shared, the same for both compilers; and the effects of this sharing have been mixed, mostly good and some few of them very bad. --jg On 1/17/12, McKown, John <john.mck...@healthmarkets.com> wrote: >> -----Original Message----- >> From: IBM Mainframe Assembler List >> [mailto:ASSEMBLER-LIST@LISTSERV.UGA.EDU] On Behalf Of Farley, >> Peter x23353 >> Sent: Tuesday, January 17, 2012 10:06 AM >> To: ASSEMBLER-LIST@LISTSERV.UGA.EDU >> Subject: Re: How bad is the EX instruction? >> > <snip> >> >> Notoriously NOT for the IBM COBOL compilers. I plead >> ignorance for the PL/1 and Fortran compilers, but the C/C++ >> compiler is the only current compiler in my personal >> experience that actually exhibits a knowledge of instruction >> timings and latency and AGI interrupts, etc., for current and >> recent pipelined "z" processors. >> >> IMHO, COBOL generated code is so bad that if I was on the >> COBOL code-generation development team I would be embarrassed >> to admit it. >> > > I have been told that part of the reason for the "horrible" code emitted by > the COBOL compiler is to guarantee 100% conformance to the ANSI standards. I > don't know this for a fact. But COBOL was designed around __decimal__ > arithmetic. And getting proper truncations and overflow notifications. So > there may be something to this. And let's not even talk about the > abomination of the PERFORM verb. Implementing that is a royal PITA, from > what I can tell. Mainly because the end of any paragraph may, or may not, > return to some other point in the code. Sometimes it "returns" to a PERFORM, > and other times it "falls through" to the next paragraph. Oh my aching > compiler. > > -- > John McKown > Systems Engineer IV > IT > > Administrative Services Group > > HealthMarkets(r) > > 9151 Boulevard 26 * N. Richland Hills * TX 76010 > (817) 255-3225 phone * > john.mck...@healthmarkets.com * www.HealthMarkets.com > > Confidentiality Notice: This e-mail message may contain confidential or > proprietary information. If you are not the intended recipient, please > contact the sender by reply e-mail and destroy all copies of the original > message. HealthMarkets(r) is the brand name for products underwritten and > issued by the insurance subsidiaries of HealthMarkets, Inc. -The Chesapeake > Life Insurance Company(r), Mid-West National Life Insurance Company of > TennesseeSM and The MEGA Life and Health Insurance Company.SM > -- John Gilmore, Ashland, MA 01721 - USA
