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| From | Ian Collins <ian-news@hotmail.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Register storage type |
| Date | 2011-05-15 09:55 +1200 |
| Message-ID | <938c2nFoqnU1@mid.individual.net> (permalink) |
| References | (3 earlier) <lnaaerk3sg.fsf@nuthaus.mib.org> <_ZednX81cqTb9VDQnZ2dnUVZ_s-dnZ2d@bestweb.net> <iqk7t1$u3f$1@speranza.aioe.org> <ln1v02i5az.fsf@nuthaus.mib.org> <iqms36$vj1$1@speranza.aioe.org> |
On 05/15/11 09:27 AM, Free Willy wrote: > Keith Thompson writes: >> Free Willy<nospam@nospam.com> writes: >>> >>> This is interesting, I usually use g++ which compiles the code without >>> any warnings, but gcc throws a compile error! >> >> Always remember that C and C++ are two different languages. The C++ >> semantics for "register" differ from the C semantics. >> >> <OT> >> C++ 2003 7.1.1p3: >> A register specifier has the same semantics as an auto specifier >> together with a hint to the implementation that the object so >> declared will be heavily used. [Note: the hint can be ignored and in >> most implementations it will be ignored if the address of the object >> is taken. —end note] >> </OT> > > That's interesting, although I don't think it really explains it - I > normally use g++ in C mode because it gives some extra type checking, eg > prevents implicit typecasting of pointers. > > Personally I think the C++ way is better than the C way - it avoids > problems if you try to assign more register variables than the machine > has registers available, effectively in C++ it sounds like the compiler > can "fall back" to discarding the register specification and treating it > like a normal stack variable should there be no register available. The easiest solution is to not use the register keyword. It's an anachronism with modern compilers. > I use the register keyword to tell the compiler that a variable is used a > lot eg as a loop index. What I "really want" is for the compiler to > optimize access to that variable - putting it in a register is only a > means to an end! The compiler can perform the required optimisations on its own! -- Ian Collins
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Register storage type Free Willy <nospam@nospam.com> - 2011-05-12 20:55 +0000
Re: Register storage type Kenneth Brody <kenbrody@spamcop.net> - 2011-05-12 17:02 -0400
Re: Register storage type Free Willy <nospam@nospam.com> - 2011-05-12 21:13 +0000
Re: Register storage type Angel <angel+news@spamcop.net> - 2011-05-12 21:20 +0000
Re: Register storage type Keith Thompson <kst-u@mib.org> - 2011-05-12 14:27 -0700
Re: Register storage type Kenneth Brody <kenbrody@spamcop.net> - 2011-05-13 13:20 -0400
Re: Register storage type Free Willy <nospam@nospam.com> - 2011-05-13 21:30 +0000
Re: Register storage type Keith Thompson <kst-u@mib.org> - 2011-05-13 15:50 -0700
Different languages (Was: Register storage type) gazelle@shell.xmission.com (Kenny McCormack) - 2011-05-14 08:58 +0000
Re: Different languages (Was: Register storage type) Dr Nick <3-nospam@temporary-address.org.uk> - 2011-05-14 10:09 +0100
Re: Register storage type Free Willy <nospam@nospam.com> - 2011-05-14 21:27 +0000
Re: Register storage type Ian Collins <ian-news@hotmail.com> - 2011-05-15 09:55 +1200
Re: Register storage type Keith Thompson <kst-u@mib.org> - 2011-05-14 16:46 -0700
Re: Register storage type Jens <jens.gustedt@gmail.com> - 2011-05-15 10:08 -0700
Re: Register storage type James Kuyper <jameskuyper@verizon.net> - 2011-05-15 14:09 -0400
Re: Register storage type David Thompson <dave.thompson2@verizon.net> - 2011-05-19 01:50 -0400
Re: Register storage type Stephen Sprunk <stephen@sprunk.org> - 2011-05-15 00:27 -0500
Re: Register storage type Angel <angel+news@spamcop.net> - 2011-05-15 12:56 +0000
Re: Register storage type Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-05-15 11:54 -0400
Re: Register storage type Seebs <usenet-nospam@seebs.net> - 2011-05-15 17:43 +0000
Re: Register storage type Tim Rentsch <txr@alumni.caltech.edu> - 2011-05-18 23:37 -0700
Re: Register storage type Seebs <usenet-nospam@seebs.net> - 2011-05-19 14:37 +0000
Drift: Linguistics (was Re: Register storage type) Kenneth Brody <kenbrody@spamcop.net> - 2011-05-19 13:17 -0400
Re: Register storage type Tim Rentsch <txr@alumni.caltech.edu> - 2011-05-19 11:05 -0700
Re: Register storage type Seebs <usenet-nospam@seebs.net> - 2011-05-19 19:08 +0000
Re: Register storage type Tim Rentsch <txr@alumni.caltech.edu> - 2011-05-24 00:39 -0700
Re: Register storage type Ian Collins <ian-news@hotmail.com> - 2011-05-20 07:46 +1200
Re: Register storage type Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-05-19 22:37 -0400
Re: Register storage type Michael Press <rubrum@pacbell.net> - 2011-05-25 12:57 -0700
Re: Register storage type pete <pfiland@mindspring.com> - 2011-05-15 09:09 -0400
Re: Register storage type Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-05-12 21:57 -0400
Re: Register storage type Angel <angel+news@spamcop.net> - 2011-05-12 21:14 +0000
Re: Register storage type gordonb.unc3q@burditt.org (Gordon Burditt) - 2011-05-13 07:49 -0500
Re: Register storage type Keith Thompson <kst-u@mib.org> - 2011-05-12 14:20 -0700
Re: Register storage type Seebs <usenet-nospam@seebs.net> - 2011-05-12 21:59 +0000
Re: Register storage type BGB <cr88192@hotmail.com> - 2011-05-12 15:50 -0700
Re: Register storage type Keith Thompson <kst-u@mib.org> - 2011-05-12 15:49 -0700
Re: Register storage type Seebs <usenet-nospam@seebs.net> - 2011-05-12 23:19 +0000
Re: Register storage type Keith Thompson <kst-u@mib.org> - 2011-05-12 16:29 -0700
Re: Register storage type Seebs <usenet-nospam@seebs.net> - 2011-05-13 00:15 +0000
Re: Register storage type Columbus sailed the ocean China Blue <chine.bleu@yahoo.com> - 2011-05-12 15:24 -0700
Re: Register storage type Peter Nilsson <airia@acay.com.au> - 2011-05-12 17:39 -0700
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