list of optimizations done by -O1 level

[Ian Lance Taylor]

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 doesn’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