* -Os ???
@ 1999-10-27 21:58 David Leon
1999-10-27 22:57 ` Jeffrey A Law
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: David Leon @ 1999-10-27 21:58 UTC (permalink / raw)
To: help-gcc
What does -Os do?
I've seen it used in the testsuite, but I haven't found a description in the
man pages, nor the info pages.
Thanks
David Leon
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: -Os ???
1999-10-27 21:58 -Os ??? David Leon
@ 1999-10-27 22:57 ` Jeffrey A Law
1999-10-31 13:57 ` Jeffrey A Law
1999-10-28 1:23 ` Eric Meijer
1999-10-31 13:57 ` David Leon
2 siblings, 1 reply; 6+ messages in thread
From: Jeffrey A Law @ 1999-10-27 22:57 UTC (permalink / raw)
To: David Leon; +Cc: help-gcc
In message < 7v8l27$mom$1@alexander.INS.CWRU.Edu >you write:
> What does -Os do?
> I've seen it used in the testsuite, but I haven't found a description in th
> e
> man pages, nor the info pages.
It's certainly in the info pages. Look more closely.
@item -Os
Optimize for size. @samp{-Os} enables all @samp{-O2} optimizations that
do not typically increase code size. It also performs further
optimizations designed to reduce code size.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: -Os ???
1999-10-27 21:58 -Os ??? David Leon
1999-10-27 22:57 ` Jeffrey A Law
@ 1999-10-28 1:23 ` Eric Meijer
1999-10-31 13:57 ` Eric Meijer
1999-10-31 13:57 ` David Leon
2 siblings, 1 reply; 6+ messages in thread
From: Eric Meijer @ 1999-10-28 1:23 UTC (permalink / raw)
To: help-gcc
David Leon (dzleon@yahoo.com) wrote:
: What does -Os do?
: I've seen it used in the testsuite, but I haven't found a description in the
: man pages, nor the info pages.
Then your info pages are out of date (the manual pages always are out of
date, that is normal):
`-Os'
Optimize for size. `-Os' enables all `-O2' optimizations that do
not typically increase code size. It also performs further
optimizations designed to reduce code size.
If you use multiple `-O' options, with or without level numbers,
the last such option is the one that is effective.
This often gives the fastest executable on Pentium(II(I)) processors,
because small code fits in the cache more easily.
HTH,
Eric
--
E.L. Meijer (tgakem@pebbles.chem.tue.nl)
Eindhoven Univ. of Technology
Lab. for Catalysis and Inorg. Chem. (SKA)
^ permalink raw reply [flat|nested] 6+ messages in thread
* -Os ???
1999-10-27 21:58 -Os ??? David Leon
1999-10-27 22:57 ` Jeffrey A Law
1999-10-28 1:23 ` Eric Meijer
@ 1999-10-31 13:57 ` David Leon
2 siblings, 0 replies; 6+ messages in thread
From: David Leon @ 1999-10-31 13:57 UTC (permalink / raw)
To: help-gcc
What does -Os do?
I've seen it used in the testsuite, but I haven't found a description in the
man pages, nor the info pages.
Thanks
David Leon
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: -Os ???
1999-10-27 22:57 ` Jeffrey A Law
@ 1999-10-31 13:57 ` Jeffrey A Law
0 siblings, 0 replies; 6+ messages in thread
From: Jeffrey A Law @ 1999-10-31 13:57 UTC (permalink / raw)
To: David Leon; +Cc: help-gcc
In message < 7v8l27$mom$1@alexander.INS.CWRU.Edu >you write:
> What does -Os do?
> I've seen it used in the testsuite, but I haven't found a description in th
> e
> man pages, nor the info pages.
It's certainly in the info pages. Look more closely.
@item -Os
Optimize for size. @samp{-Os} enables all @samp{-O2} optimizations that
do not typically increase code size. It also performs further
optimizations designed to reduce code size.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: -Os ???
1999-10-28 1:23 ` Eric Meijer
@ 1999-10-31 13:57 ` Eric Meijer
0 siblings, 0 replies; 6+ messages in thread
From: Eric Meijer @ 1999-10-31 13:57 UTC (permalink / raw)
To: help-gcc
David Leon (dzleon@yahoo.com) wrote:
: What does -Os do?
: I've seen it used in the testsuite, but I haven't found a description in the
: man pages, nor the info pages.
Then your info pages are out of date (the manual pages always are out of
date, that is normal):
`-Os'
Optimize for size. `-Os' enables all `-O2' optimizations that do
not typically increase code size. It also performs further
optimizations designed to reduce code size.
If you use multiple `-O' options, with or without level numbers,
the last such option is the one that is effective.
This often gives the fastest executable on Pentium(II(I)) processors,
because small code fits in the cache more easily.
HTH,
Eric
--
E.L. Meijer (tgakem@pebbles.chem.tue.nl)
Eindhoven Univ. of Technology
Lab. for Catalysis and Inorg. Chem. (SKA)
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~1999-10-31 13:57 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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1999-10-27 21:58 -Os ??? David Leon
1999-10-27 22:57 ` Jeffrey A Law
1999-10-31 13:57 ` Jeffrey A Law
1999-10-28 1:23 ` Eric Meijer
1999-10-31 13:57 ` Eric Meijer
1999-10-31 13:57 ` David Leon
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