list of optimizations done by -O1 level

[ranjith kumar]

--- Ian Lance Taylor <iant@google.com> wrote:

> ranjith kumar <ranjit_kumar_b4u@yahoo.co.uk> writes:
> 
> >  GCC manuals says the foloowing are the list of
> > optimizations turned on when -O1 flag is used.
> >
>
-------------------------------------------------------
> >  -fdefer-pop -fdelayed-branch       
> > -fguess-branch-probability -fcprop-registers
> > -floop-optimize -fif-conversion
> >            -fif-conversion2 -ftree-ccp -ftree-dce
> > -ftree-dominator-opts -ftree-dse
> >            -ftree-ter -ftree-lrs -ftree-sra
> > -ftree-copyrename -ftree-fre -ftree-ch
> >            -fmerge-constants
> >            -O also turns on -fomit-frame-pointer
> on
> > machines where doing so does not
> >            interfere with debugging.
> > 
> >            -O doesnÂ’t turn on -ftree-sra for the
> Ada
> > compiler.  This option must be
> >            explicitly specified on the command
> line to
> > be enabled for the Ada compiler.
> >
> ----------------------------------------------------
> 
> The gcc manual also says:
> 
>     Not all optimizations are controlled directly by
> a flag.  Only
>     optimizations that have a flag are listed.
> 
> Ian
> 
Sorry. What do you mean?


Is there any way to find list of optimizations enabled
by -O1?

Actually when I explicitly specified  all
optimizations, there were function calls associated
with each SIMD function called in .c file.
But when I used -O1 flag they were not present in
assembly code.
I am intrested in knowing which optimization is
replacing those function calls and at what
intermediate representation that optimization is done?

Thanks.



	
	
		
___________________________________________________________ 
New Yahoo! Mail is the ultimate force in competitive emailing. Find out more at the Yahoo! Mail Championships. Plus: play games and win prizes. 
http://uk.rd.yahoo.com/evt=44106/*http://mail.yahoo.net/uk