From: jfc@mit.edu (John F Carr)
Subject: Re: Compiler Optimisation?
Date: 1998/12/13
Date: 1998-12-13T00:00:00+00:00 [thread overview]
Message-ID: <98-12-030@comp.compilers> (raw)
In-Reply-To: 98-12-020@comp.compilers
Thomas W. Christopher <tc@charlie.cns.iit.edu> wrote:
>As I recall, he found that "folding," performing constant arithmetic at
>compile time, not only makes the compiled code run faster, but also the
>compiler.
On AIX 3.1, I found that "gcc -O -c" was often faster than "gcc -c"
because the assembler was so slow. Apparently IBM didn't use it much
internally (or adb, the assembly-level debugger which was also slow
and buggy). It was faster for gcc to optimize the code than it was
for as to process the extra instructions in unoptimized code.
--
John Carr (jfc@mit.edu)
next prev parent reply other threads:[~1998-12-13 0:00 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-12-06 0:00 Compiler Optimisation? Iain Bate
1998-12-07 0:00 ` Marin David Condic
1998-12-10 0:00 ` Ray Dillinger
1998-12-13 0:00 ` dewarr
1998-12-18 0:00 ` Ray Dillinger
1998-12-18 0:00 ` Stefan Monnier
1998-12-10 0:00 ` Thomas W. Christopher
1998-12-13 0:00 ` Mike Albaugh
1998-12-13 0:00 ` John F Carr [this message]
1998-12-13 0:00 ` Andy Gaynor
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