[4.0] Doc patch for -ftree-fre

[Ben Elliston <bje at au1 dot ibm dot com>]

Okay for the 4.0 branch?

2005-04-05  Ben Elliston  <bje@au.ibm.com>

        * doc/invoke.texi (Optimize Options): Remove -ftree-fre from the
        list of options enabled at -O, as it has no effect.  Explain this
        in the detailed description of the option.

Index: invoke.texi
===================================================================
RCS file: /home/bje/gcc-cvs/gcc/gcc/doc/invoke.texi,v
retrieving revision 1.583.2.7
diff -u -p -r1.583.2.7 invoke.texi
--- invoke.texi 4 Apr 2005 18:13:55 -0000       1.583.2.7
+++ invoke.texi 5 Apr 2005 03:57:02 -0000
@@ -4090,7 +4090,6 @@ compilation time.
 -ftree-live_range_split @gol
 -ftree-sra @gol
 -ftree-copyrename @gol
--ftree-fre @gol
 -ftree-ch @gol
 -fmerge-constants}

@@ -4671,7 +4670,7 @@ Perform Full Redundancy Elimination (FRE
 between FRE and PRE is that FRE only considers expressions
 that are computed on all paths leading to the redundant computation.
 This analysis faster than PRE, though it exposes fewer redundancies.
-This flag is enabled by default at @option{-O} and higher.
+This flag currently has no effect.

 @item -ftree-ccp
 Perform sparse conditional constant propagation (CCP) on trees.  This flag

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