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- Newsgroups: comp.lang.c++,comp.programming,comp.arch
- Path: netcom.com!NewsWatcher!user
- From: hbaker@netcom.com (Henry Baker)
- Subject: Re: Why are 32 bit better than 16 bit pgms?
- Message-ID: <hbaker-0702960638530001@10.0.2.15>
- Sender: hbaker@netcom4.netcom.com
- Organization: nil organization
- References: <4er4m4$78q@news1.ucsd.edu> <1996Feb5.163838.24531@amc.com> <1996Feb6.135808.12257@friend.kastle.com> <4f9e3p$alp@murrow.corp.sgi.com>
- Date: Wed, 7 Feb 1996 14:38:53 GMT
-
- In article <4f9e3p$alp@murrow.corp.sgi.com>, mash@mash.engr.sgi.com (John
- R. Mashey) wrote:
-
- > In article <1996Feb6.135808.12257@friend.kastle.com>, rich@kastle.com
- (Richard Krehbiel) writes:
- > |>
- > |> curtis@amc.com (Curtis Green) wrote:
- > |>
- > |> >The "bits" quoted for the processor (16 bit, 32 bit, 64 bit, etc) is the
- > |> >size of the data path (data bus).
- > One more time, since this has been discussed here about every 6 months:
- > through computer history, there has been one overpoweringly common usage:
- >
- > An N-bit architecture has an ISA with N-bit integer registers.
- >
- > Implementations of such an architecture can vary all over the map:
- > 1) FP registers frequently have different sizes [>=N]
- > 2) Internal busses, even the integer ones, occasionally use different
- > sizes [<= N]
- > 3) External busses frequently have different sizes [=N, <N, >N]
-
- While this is a good 'short' answer, the real answer will depend upon the
- context and who is asking the question. If you are a compiler-writer, you
- may get one answer; if you are a cache designer, you may get another answer;
- if you are an I/O designer, you may get yet another answer.
-
- Even in the compiler world, some instructions may be bit-oriented, some
- may be byte-oriented, some may be word-oriented, and some may be double-word
- oriented.
-
- There are obviously differences in usage in the 'big iron' world, in the
- workstation world, in the PC world, in the electronic games world. Every
- once in a while, some manufacturer takes it upon itself to attempt to
- redefine the meaning of certain words, and sometimes succeeds.
-
- It is very difficult to legislate English usage. Even in mathematics, where
- usage is often remarkably consistent, there is still a range of usage, so
- you do have to pay attention to the definitions in the early part of a
- math paper.
-
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