documentation of ipa additions.

[Kenneth Zadeck]

second try.

kenny

Jan Hubicka wrote:
>>I did not document these flags in the initial patch.
>>    
>Hi,
>unit-at-a-time is now enabled by defualt -O1 for C too, so your
>documentation can probably be simplified.
>
>Honza
>  
>>kenny
>>
>>    
>
>  
>>Index: invoke.texi
>>===================================================================
>>RCS file: /cvs/gcc/gcc/gcc/doc/invoke.texi,v
>>retrieving revision 1.648
>>diff -u -p -r1.648 invoke.texi
>>--- invoke.texi	13 Jul 2005 09:38:44 -0000	1.648
>>+++ invoke.texi	18 Jul 2005 16:08:46 -0000
>>@@ -305,7 +305,9 @@ Objective-C and Objective-C++ Dialects}.
>> -fforce-addr  -ffunction-sections @gol
>> -fgcse  -fgcse-lm  -fgcse-sm  -fgcse-las  -fgcse-after-reload @gol
>> -floop-optimize -fcrossjumping  -fif-conversion  -fif-conversion2 @gol
>>--finline-functions  -finline-limit=@var{n}  -fkeep-inline-functions @gol
>>+-finline-functions  -finline-limit=@var{n} @gol 
>>+-fipa-pure-const -fipa-reference -fipa-type-escape  @gol
>>+-fkeep-inline-functions @gol
>> -fkeep-static-consts  -fmerge-constants  -fmerge-all-constants @gol
>> -fmodulo-sched -fno-branch-count-reg @gol
>> -fno-default-inline  -fno-defer-pop -floop-optimize2 -fmove-loop-invariants @gol
>>@@ -4877,6 +4879,21 @@ those which have no call-preserved regis
>> 
>> Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}.
>> 
>>+@item -fipa-pure-const .  
>>+Discover pure and const functions.  This flag is enabled by default at
>>+@option{-O2} and above for C and at @option{-O1} and above for other
>>+languages.
>>+
>>+@item -fipa-reference 
>>+Perform analysis on the static references.  This flag is
>>+enabled by default at @option{-O2} and above for C and at @option{-O1}
>>+and above for other languages.
>>+
>>+@item -fipa-type-escape
>>+Perform type escape analysis.  This flag is enabled by default at
>>+@option{-O2} and above for C and at @option{-O1} and above for other
>>+languages.
>>+
>> @item -ftree-pre
>> Perform Partial Redundancy Elimination (PRE) on trees.  This flag is
>> enabled by default at @option{-O2} and @option{-O3}.
>>    
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