[Bug middle-end/39976] [4.5 Regression] Big sixtrack degradation on powerpc 32/64 after revision r146817

[pinskia at gcc dot gnu dot org]

------- Comment #13 from pinskia at gcc dot gnu dot org  2009-05-12 15:29 -------
(In reply to comment #12)
> I'm working on a fix.  Earlier compilers contained a hack for this (because
> swing modulo scheduling can only deal with single BB loops), 

It was not just SMS which only can deal with single BB loops, that change
improved other loops in general because the register allocator was not able to
get rid of the extra basic block (just SMS showed it more).  Since my name is
on that change, my motivation at the time the part of the patch was written was
not SMS (SMS was an after thought to me).


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39976