Hi Janis, [EMAIL PROTECTED] (Janis Johnson) wrote on 01.09.05 in <[EMAIL PROTECTED]>:
[quoteto.xps] > On Thu, Sep 01, 2005 at 11:45:35PM +0200, Steven Bosscher wrote: > > On Thursday 01 September 2005 23:19, girish vaitheeswaran wrote: > > > Sorry I still did not follow. This is what I > > > understood. During Feedback optimization apart from > > > the -fprofile-generate, one needs to turn on > > > -fmove-loop-invariants. > > > > You don't "need to". It just might help iff you are using a gcc 4.1 > > based compiler. > > > > > However this option is not > > > recognized by the gcc 3.4.4 or 3.4.3 compilers. What > > > am I missing? > > > > You are missing that > > 1) this whole thread does not concern gcc 3.4.x; and > > 2) the option -fmove-loop-invariants does not exist in 3.4.x. > > Girish started this thread about problems he is seeing with GCC 3.4.3 The discussion, maybe. The thread, definitely not - that was started by Peter Steinmetz (new subject, no References:). And it was explicitely about "using mainline": ] There was some discussion a few weeks ago about some apps running slower ] with FDO enabled. ... ] While this doesn't explain all of the degradations discussed (some were ] showing up on older versions of the compiler), it may explain some. MfG Kai
