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Re: Suggested addition to documentation
- To: lucier at math dot purdue dot edu (Brad Lucier)
- Subject: Re: Suggested addition to documentation
- From: Joern Rennecke <amylaar at redhat dot com>
- Date: Tue, 12 Jun 2001 20:32:23 +0100 (BST)
- Cc: gcc at gcc dot gnu dot org, lucier at math dot purdue dot edu
> I couldn't find the best place in the documentation to put this note.
>
> This is true for 3.0; I believe there have been three questions
> about this performance issue since last summer posted to the
> gcc mail list.
>
> Note: If you write a program using computed gotos, a GCC extension,
> and you compile the program with optimization level @samp{-O2} or higher,
> you may get better runtime performance if you disable the global common
> subexpression elmination (gcse) pass by adding the @samp{-fno-gcse} option'
> to the command line.
I suggest to put it in invoke.texi, in the description of the -fgcse option.