[Bug target/50164] [IRA, 4.7 Regression] Performance degradation due to increased memory instructions count

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50164

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> 2011-08-25 13:58:28 UTC ---
(In reply to comment #2)
> (In reply to comment #1)
> > Yesterday I sent a patch
> > http://gcc.gnu.org/ml/gcc-patches/2011-08/msg01954.html which most probably
> > solved the problem.
> > 
> > Now I have code size 419 (gcc 4.6) vs 411 (gcc as of Aug 24) bytes for the
> > test.
> 
> I tried it but unfortunately it did not solve the regression. We still have xk
> on the stack and x1.5 more memory accesses in GCC 4.7 assembly for mentioned
> code part. GCC 4.6 produces bigger but faster code.
> 

Can you find which checkin caused this?