Re: gcc optimization with -O<x>

[Eljay Love-Jensen <eljay@xxxxxxxxx>]

Hi Daniel,

To help assess "exact what it enables", you can follow these Unix / bash 
steps...

touch dummy.cpp
g++ -O3 -S -fverbose-asm dummy.cpp
cat dummy.s

Replace "-O3" with whatever carte blanche optimization setting you are 
interested in.

HTH,
--Eljay


At 03:17 PM 9/17/2004, Daniel Eftodi wrote:
> Hello,
>
> I have this Q about what '-O4 thru -O6 and -O9' does/exactly what it enables,
> and so forth.
>
> yes, I've read the relative sections[1,2] of the manual about this topic - and
> find only up to -O3 defined.
>
> - - -
> [1] -
> http://gcc.gnu.org/onlinedocs/gcc-3.4.2/gcc/i386-and-x86_002d64-Options.html#i386-and-x86_002d64-Options
> [2] - 
> http://gcc.gnu.org/onlinedocs/gcc-3.4.2/gcc/Optimize-Options.html#Optimize-Options
>
>
>
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