I had much rather debug a Cobol program any day vs. what passes for
C-code now days.
Even trying to make simple changes to a C/C++ program can require hours
just to figure out what the program is really doing.
Tony Thigpen
-----Original Message -----
From: Farley, Peter x23353
Sent: 01/17/2012 11:06 AM
-----Original Message-----
From: IBM Mainframe Assembler List [mailto:ASSEMBLER-
[email protected]] On Behalf Of Paul Gilmartin
Sent: Tuesday, January 17, 2012 10:32 AM
To: [email protected]
Subject: Re: How bad is the EX instruction?
On Jan 16, 2012, at 08:21, Kerry wrote:
Performance is one of the strongest reasons for coding in assembler and
this discussion characterizes some of the low hanging fruit available
for the attainment thereof.
Others have said here that performance is a strong reason
for _not_ coding in assembler:
o Compiler developers have done the research on instruction
timings and know better than most end users what sequences
fit the pipelines optimally.
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.
o Compiled code can be re-optimized for a new generation of
hardware simply by recompiling.
o Interpreters can dynamically recompile based on statistical
profiles evaluated at the actual time of execution.
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