Re: Patch: Promoting characters to 31 bits (for discussion)
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SL Baur <steve(a)xemacs.org> writes:
O.K. Since size matters to you, how about another alternative? What
would/could we gain or lose by using long long as EMACS_INTs on 32 bit
architectures?
1. Portability. Presumably gcc version < 2.8 generates awfull code for
long long. Older Solaris compilers don't support it.
2. Speed. Even on a 64-bit processor a 64-bit XEmacs is much slower
than a 32-bit one.
3. Yet another versioning headache. I would want 32-bit + UCS4.
Jan
Valdis Kl=?iso8859-4?Q?=BA?=tnieks
Friday, 2 July
Fri, 2 Jul
3:42 p.m.
New subject: Patch: Promoting characters to 31 bits (for discussion)
On 02 Jul 1999 12:20:17 +0200, Jan Vroonhof <vroonhof(a)math.ethz.ch> said:
2. Speed. Even on a 64-bit processor a 64-bit XEmacs is much slower
than a 32-bit one.
Has anybody done any benchmarking to determine why this is so? My first
instinctive guess is that the fact that objects are twice as big means
that only half as many can fit into the processor's L1/L2 caches.
Are *most* programs affected by a slowdown if recompiled in 64-bit mode,
or does it seem to be XEmacs-specific? If the latter, it should be (at
least theoretically) possible to track down and shoot the culprit...
--
Valdis Kletnieks
Computer Systems Senior Engineer
Virginia Tech
9277
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Valdis Kl=?iso8859-4?Q?=BA?=tnieks