other than pragma

[parag_paul@hotmail.com]

is there any compiler directive that will enforce optimizations?

[Eric Sosman]

Re: other than pragma

parag_paul@hotm ail.com wrote:

is there any compiler directive that will enforce optimizations?

Define precisely what you mean by "optimizations. "

--
Eric Sosman
esosman@ieee-dot-org.invalid

[parag_paul@hotmail.com]

Re: other than pragma

On Feb 10, 9:09 pm, Eric Sosman <esos...@ieee-dot-org.invalidwrot e:

parag_p...@hotm ail.com wrote:

is there any compiler directive that will enforce optimizations?

>
Define precisely what you mean by "optimizations. "
>
--
Eric Sosman
esos...@ieee-dot-org.invalid

Teh optmizations that cn be achived by the compile line options -O4 etc

[Walter Roberson]

Re: other than pragma

In article <7ad8c954-eea0-4d08-bc0c-fe112e8743b2@p6 9g2000hsa.googl egroups.com>,
parag_paul@hotm ail.com <parag_paul@hot mail.comwrote:

>On Feb 10, 9:09 pm, Eric Sosman <esos...@ieee-dot-org.invalidwrot e:

>parag_p...@hot mail.com wrote:

is there any compiler directive that will enforce optimizations?

> Define precisely what you mean by "optimizations. "

>Teh optmizations that cn be achived by the compile line options -O4 etc

The original article has not shown up here, so I am perhaps missing
some key context, but the answer is three-fold:

1) C has a very limited number of standard pragmas (and no
standard pragmas at all in C90), none of which has to do with
optimization. Any pragma along this lines that you happened to find
would be non-portable (but ignored by other compilers that did not
happen to have a pragma with the same name)

2) pragmas -suggest- rather than -enforce- .

3) I have never encountered a C compiler with a pragma that
affected optimization.
--
"All is vanity." -- Ecclesiastes

[Eric Sosman]

Re: other than pragma

parag_paul@hotm ail.com wrote:

On Feb 10, 9:09 pm, Eric Sosman <esos...@ieee-dot-org.invalidwrot e:

>parag_p...@hot mail.com wrote:

>>is there any compiler directive that will enforce optimizations?

> Define precisely what you mean by "optimizations. "

>
Teh optmizations that cn be achived by the compile line options -O4 etc

If you think this is a "precise" definition, you should
consider a career change ...

Try again: Offer a *precise* definition of "optimizations, "
using terms that are applicable to all systems where C is
implemented, and that cover all (or at least most) possible
optimality metrics. I think the effort of formulating such a
definition will teach you something valuable, and I will applaud
your sincere attempt enthusiasticall y by clapping one hand.

--
Eric Sosman
esosman@ieee-dot-org.invalid

[christian.bau]

Re: other than pragma

On Feb 10, 4:23 pm, rober...@ibd.nr c-cnrc.gc.ca (Walter Roberson)
wrote:

3) I have never encountered a C compiler with a pragma that
affected optimization.

Metrowerks Codewarrior used to do that. Quite useful at times.